通过 XENONnT 的相干弹性中微核散射首次发现太阳 8BN 中微子

IF 8.1 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Physical review letters Pub Date : 2024-11-07 DOI:10.1103/physrevlett.133.191002
E. Aprileet al.(XENON Collaboration)
{"title":"通过 XENONnT 的相干弹性中微核散射首次发现太阳 8BN 中微子","authors":"E. Aprileet al.(XENON Collaboration)","doi":"10.1103/physrevlett.133.191002","DOIUrl":null,"url":null,"abstract":"We present the first measurement of nuclear recoils from solar <mjx-container ctxtmenu_counter=\"37\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(5 0 1 2 3 4)\"><mjx-mrow><mjx-mmultiscripts data-semantic-children=\"0,1,2,3,4\" data-semantic-collapsed=\"(5 0 1 2 3 4)\" data-semantic- data-semantic-owns=\"0 1 2 3 4\" data-semantic-role=\"latinletter\" data-semantic-speech=\"Superscript 8 Baseline normal upper B\" data-semantic-type=\"tensor\"><mjx-prescripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-mrow size=\"s\"><mjx-mn data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsuper\" data-semantic-type=\"number\"><mjx-c>8</mjx-c></mjx-mn></mjx-mrow></mjx-cell></mjx-row><mjx-row style=\"height: 0.602em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-prescripts><mjx-mrow><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"><mjx-c>B</mjx-c></mjx-mi></mjx-mrow><mjx-scripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsuper\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row><mjx-row style=\"height: 0.61em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-scripts></mjx-mmultiscripts></mjx-mrow></mjx-math></mjx-container> neutrinos via coherent elastic neutrino-nucleus scattering with the XENONnT dark matter experiment. The central detector of XENONnT is a low-background, two-phase time projection chamber with a 5.9 t sensitive liquid xenon target. A blind analysis with an exposure of <mjx-container ctxtmenu_counter=\"38\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(10 0 1 2 (6 3 4 5))\"><mjx-mrow data-semantic-children=\"0,1,2,6\" data-semantic-collapsed=\"(10 (c 7 8 9) 0 1 2 6)\" data-semantic- data-semantic-owns=\"0 1 2 6\" data-semantic-role=\"text\" data-semantic-speech=\"3.51 normal t times y r\" data-semantic-type=\"punctuated\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"10\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">3</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">.</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">5</mjx-c><mjx-c style=\"padding-top: 0.644em;\">1</mjx-c></mjx-mn><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic- data-semantic-parent=\"10\" data-semantic-role=\"space\" data-semantic-type=\"text\" style='font-family: MJX-STX-ZERO, \"Helvetica Neue\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\" variant=\"-explicitFont\"> </mjx-utext></mjx-mtext><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic- data-semantic-parent=\"10\" data-semantic-role=\"space\" data-semantic-type=\"text\" style='font-family: MJX-STX-ZERO, \"Helvetica Neue\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\" variant=\"-explicitFont\"> </mjx-utext></mjx-mtext><mjx-mrow data-semantic-added=\"true\" data-semantic-children=\"3,5\" data-semantic-content=\"4\" data-semantic- data-semantic-owns=\"3 4 5\" data-semantic-parent=\"10\" data-semantic-role=\"multiplication\" data-semantic-type=\"infixop\"><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"6\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"><mjx-c>t</mjx-c></mjx-mi><mjx-mo data-semantic- data-semantic-operator=\"infixop,×\" data-semantic-parent=\"6\" data-semantic-role=\"multiplication\" data-semantic-type=\"operator\" space=\"3\"><mjx-c>×</mjx-c></mjx-mo><mjx-mi data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"6\" data-semantic-role=\"unknown\" data-semantic-type=\"identifier\" space=\"3\"><mjx-c noic=\"true\" style=\"padding-top: 0.488em;\">y</mjx-c><mjx-c style=\"padding-top: 0.488em;\">r</mjx-c></mjx-mi></mjx-mrow></mjx-mrow></mjx-math></mjx-container> resulted in 37 observed events above 0.5 keV, with (<mjx-container ctxtmenu_counter=\"39\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(8 (7 0 (3 1 2)) (6 4 5))\"><mjx-msubsup data-semantic-children=\"0,3,6\" data-semantic-collapsed=\"(8 (7 0 3) 6)\" data-semantic- data-semantic-owns=\"0 3 6\" data-semantic-role=\"float\" data-semantic-speech=\"26.4 Subscript negative 1.3 Superscript plus 1.4\" data-semantic-type=\"subsup\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"8\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.646em;\">2</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.646em;\">6</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.646em;\">.</mjx-c><mjx-c style=\"padding-top: 0.646em;\">4</mjx-c></mjx-mn><mjx-script style=\"vertical-align: -0.276em; margin-left: 0px;\"><mjx-mrow data-semantic-children=\"5\" data-semantic-content=\"4\" data-semantic- data-semantic-owns=\"4 5\" data-semantic-parent=\"8\" data-semantic-role=\"positive\" data-semantic-type=\"prefixop\" size=\"s\"><mjx-mo data-semantic- data-semantic-operator=\"prefixop,+\" data-semantic-parent=\"6\" data-semantic-role=\"addition\" data-semantic-type=\"operator\"><mjx-c>+</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"6\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.645em;\">1</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.645em;\">.</mjx-c><mjx-c style=\"padding-top: 0.645em;\">4</mjx-c></mjx-mn></mjx-mrow><mjx-spacer style=\"margin-top: 0.204em;\"></mjx-spacer><mjx-mrow data-semantic-annotation=\"clearspeak:simple\" data-semantic-children=\"2\" data-semantic-content=\"1\" data-semantic- data-semantic-owns=\"1 2\" data-semantic-parent=\"8\" data-semantic-role=\"negative\" data-semantic-type=\"prefixop\" size=\"s\"><mjx-mo data-semantic- data-semantic-operator=\"prefixop,−\" data-semantic-parent=\"3\" data-semantic-role=\"subtraction\" data-semantic-type=\"operator\"><mjx-c>−</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">1</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">.</mjx-c><mjx-c style=\"padding-top: 0.644em;\">3</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msubsup></mjx-math></mjx-container>) events expected from backgrounds. The background-only hypothesis is rejected with a statistical significance of <mjx-container ctxtmenu_counter=\"40\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(3 0 2 1)\"><mjx-mrow data-semantic-annotation=\"clearspeak:simple;clearspeak:unit\" data-semantic-children=\"0,1\" data-semantic-content=\"2\" data-semantic- data-semantic-owns=\"0 2 1\" data-semantic-role=\"implicit\" data-semantic-speech=\"2.73 sigma\" data-semantic-type=\"infixop\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">2</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">.</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">7</mjx-c><mjx-c style=\"padding-top: 0.644em;\">3</mjx-c></mjx-mn><mjx-mo data-semantic-added=\"true\" data-semantic- data-semantic-operator=\"infixop,⁢\" data-semantic-parent=\"3\" data-semantic-role=\"multiplication\" data-semantic-type=\"operator\"><mjx-c>⁢</mjx-c></mjx-mo><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"italic\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"greekletter\" data-semantic-type=\"identifier\"><mjx-c>𝜎</mjx-c></mjx-mi></mjx-mrow></mjx-math></mjx-container>. The measured <mjx-container ctxtmenu_counter=\"41\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(5 0 1 2 3 4)\"><mjx-mrow><mjx-mmultiscripts data-semantic-children=\"0,1,2,3,4\" data-semantic-collapsed=\"(5 0 1 2 3 4)\" data-semantic- data-semantic-owns=\"0 1 2 3 4\" data-semantic-role=\"latinletter\" data-semantic-speech=\"Superscript 8 Baseline normal upper B\" data-semantic-type=\"tensor\"><mjx-prescripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-mrow size=\"s\"><mjx-mn data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsuper\" data-semantic-type=\"number\"><mjx-c>8</mjx-c></mjx-mn></mjx-mrow></mjx-cell></mjx-row><mjx-row style=\"height: 0.602em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-prescripts><mjx-mrow><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"><mjx-c>B</mjx-c></mjx-mi></mjx-mrow><mjx-scripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsuper\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row><mjx-row style=\"height: 0.61em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-scripts></mjx-mmultiscripts></mjx-mrow></mjx-math></mjx-container> solar neutrino flux of <mjx-container ctxtmenu_counter=\"42\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(35 (29 (28 0 (9 (8 1 (4 2 3)) (7 5 6)) 10) 11 (14 12 13)) 15 16 (21 17 (20 18 19)) 22 (27 23 (26 24 25)))\"><mjx-mrow data-semantic-children=\"29,15,16,21,22,27\" data-semantic-collapsed=\"(35 (c 30 31 32 33 34) 29 15 16 21 22 27)\" data-semantic- data-semantic-owns=\"29 15 16 21 22 27\" data-semantic-role=\"text\" data-semantic-speech=\"left parenthesis 4.7 Subscript negative 2.3 Superscript plus 3.6 Baseline right parenthesis times 10 Superscript 6 Baseline c m Superscript negative 2 Baseline normal s Superscript negative 1\" data-semantic-type=\"punctuated\"><mjx-mrow data-semantic-added=\"true\" data-semantic-children=\"28,14\" data-semantic-content=\"11\" data-semantic- data-semantic-owns=\"28 11 14\" data-semantic-parent=\"35\" data-semantic-role=\"multiplication\" data-semantic-type=\"infixop\"><mjx-mrow data-semantic-added=\"true\" data-semantic-children=\"9\" data-semantic-content=\"0,10\" data-semantic- data-semantic-owns=\"0 9 10\" data-semantic-parent=\"29\" data-semantic-role=\"leftright\" data-semantic-type=\"fenced\"><mjx-mo data-semantic- data-semantic-operator=\"fenced\" data-semantic-parent=\"28\" data-semantic-role=\"open\" data-semantic-type=\"fence\" style=\"vertical-align: -0.02em;\"><mjx-c>(</mjx-c></mjx-mo><mjx-msubsup data-semantic-children=\"1,4,7\" data-semantic-collapsed=\"(9 (8 1 4) 7)\" data-semantic- data-semantic-owns=\"1 4 7\" data-semantic-parent=\"28\" data-semantic-role=\"float\" data-semantic-type=\"subsup\"><mjx-mrow><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"9\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.645em;\">4</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.645em;\">.</mjx-c><mjx-c style=\"padding-top: 0.645em;\">7</mjx-c></mjx-mn></mjx-mrow><mjx-script style=\"vertical-align: -0.276em; margin-left: 0px;\"><mjx-mrow data-semantic-children=\"6\" data-semantic-content=\"5\" data-semantic- data-semantic-owns=\"5 6\" data-semantic-parent=\"9\" data-semantic-role=\"positive\" data-semantic-type=\"prefixop\" size=\"s\"><mjx-mo data-semantic- data-semantic-operator=\"prefixop,+\" data-semantic-parent=\"7\" data-semantic-role=\"addition\" data-semantic-type=\"operator\"><mjx-c>+</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"7\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.646em;\">3</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.646em;\">.</mjx-c><mjx-c style=\"padding-top: 0.646em;\">6</mjx-c></mjx-mn></mjx-mrow><mjx-spacer style=\"margin-top: 0.204em;\"></mjx-spacer><mjx-mrow data-semantic-annotation=\"clearspeak:simple\" data-semantic-children=\"3\" data-semantic-content=\"2\" data-semantic- data-semantic-owns=\"2 3\" data-semantic-parent=\"9\" data-semantic-role=\"negative\" data-semantic-type=\"prefixop\" size=\"s\"><mjx-mo data-semantic- data-semantic-operator=\"prefixop,−\" data-semantic-parent=\"4\" data-semantic-role=\"subtraction\" data-semantic-type=\"operator\"><mjx-c>−</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"4\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">2</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">.</mjx-c><mjx-c style=\"padding-top: 0.644em;\">3</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msubsup><mjx-mo data-semantic- data-semantic-operator=\"fenced\" data-semantic-parent=\"28\" data-semantic-role=\"close\" data-semantic-type=\"fence\" style=\"vertical-align: -0.02em;\"><mjx-c>)</mjx-c></mjx-mo></mjx-mrow><mjx-mo data-semantic- data-semantic-operator=\"infixop,×\" data-semantic-parent=\"29\" data-semantic-role=\"multiplication\" data-semantic-type=\"operator\" space=\"3\"><mjx-c>×</mjx-c></mjx-mo><mjx-msup data-semantic-children=\"12,13\" data-semantic- data-semantic-owns=\"12 13\" data-semantic-parent=\"29\" data-semantic-role=\"integer\" data-semantic-type=\"superscript\" space=\"3\"><mjx-mrow><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"14\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.642em;\">1</mjx-c><mjx-c style=\"padding-top: 0.642em;\">0</mjx-c></mjx-mn></mjx-mrow><mjx-script style=\"vertical-align: 0.369em;\"><mjx-mrow size=\"s\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"14\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c>6</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msup></mjx-mrow><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic- data-semantic-parent=\"35\" data-semantic-role=\"space\" data-semantic-type=\"text\" style='font-family: MJX-STX-ZERO, \"Helvetica Neue\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\" variant=\"-explicitFont\"> </mjx-utext></mjx-mtext><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic- data-semantic-parent=\"35\" data-semantic-role=\"space\" data-semantic-type=\"text\" style='font-family: MJX-STX-ZERO, \"Helvetica Neue\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\" variant=\"-explicitFont\"> </mjx-utext></mjx-mtext><mjx-msup data-semantic-children=\"17,20\" data-semantic- data-semantic-owns=\"17 20\" data-semantic-parent=\"35\" data-semantic-role=\"unknown\" data-semantic-type=\"superscript\"><mjx-mrow><mjx-mi data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"21\" data-semantic-role=\"unknown\" data-semantic-type=\"identifier\"><mjx-c noic=\"true\" style=\"padding-top: 0.485em;\">c</mjx-c><mjx-c style=\"padding-top: 0.485em;\">m</mjx-c></mjx-mi></mjx-mrow><mjx-script style=\"vertical-align: 0.363em;\"><mjx-mrow data-semantic-annotation=\"clearspeak:simple\" data-semantic-children=\"19\" data-semantic-content=\"18\" data-semantic- data-semantic-owns=\"18 19\" data-semantic-parent=\"21\" data-semantic-role=\"negative\" data-semantic-type=\"prefixop\" size=\"s\"><mjx-mo data-semantic- data-semantic-operator=\"prefixop,−\" data-semantic-parent=\"20\" data-semantic-role=\"subtraction\" data-semantic-type=\"operator\"><mjx-c>−</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"20\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c>2</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msup><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic- data-semantic-parent=\"35\" data-semantic-role=\"space\" data-semantic-type=\"text\" style='font-family: MJX-STX-ZERO, \"Helvetica Neue\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\" variant=\"-explicitFont\"> </mjx-utext></mjx-mtext><mjx-msup data-semantic-children=\"23,26\" data-semantic- data-semantic-owns=\"23 26\" data-semantic-parent=\"35\" data-semantic-role=\"latinletter\" data-semantic-type=\"superscript\"><mjx-mrow><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"27\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"><mjx-c>s</mjx-c></mjx-mi></mjx-mrow><mjx-script style=\"vertical-align: 0.363em;\"><mjx-mrow data-semantic-annotation=\"clearspeak:simple\" data-semantic-children=\"25\" data-semantic-content=\"24\" data-semantic- data-semantic-owns=\"24 25\" data-semantic-parent=\"27\" data-semantic-role=\"negative\" data-semantic-type=\"prefixop\" size=\"s\"><mjx-mo data-semantic- data-semantic-operator=\"prefixop,−\" data-semantic-parent=\"26\" data-semantic-role=\"subtraction\" data-semantic-type=\"operator\"><mjx-c>−</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"26\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c>1</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msup></mjx-mrow></mjx-math></mjx-container> is consistent with results from the Sudbury Neutrino Observatory. The measured neutrino flux-weighted <mjx-container ctxtmenu_counter=\"43\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(5 0 3 1 4 2)\"><mjx-mrow data-semantic-annotation=\"clearspeak:unit\" data-semantic-children=\"0,1,2\" data-semantic-content=\"3,4\" data-semantic- data-semantic-owns=\"0 3 1 4 2\" data-semantic-role=\"implicit\" data-semantic-speech=\"upper C upper E nu upper N upper S\" data-semantic-type=\"infixop\"><mjx-mi data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"unknown\" data-semantic-type=\"identifier\"><mjx-c noic=\"true\" style=\"padding-top: 0.669em;\">C</mjx-c><mjx-c style=\"padding-top: 0.669em;\">E</mjx-c></mjx-mi><mjx-mo data-semantic-added=\"true\" data-semantic- data-semantic-operator=\"infixop,⁢\" data-semantic-parent=\"5\" data-semantic-role=\"multiplication\" data-semantic-type=\"operator\"><mjx-c>⁢</mjx-c></mjx-mo><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"italic\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"greekletter\" data-semantic-type=\"identifier\" space=\"2\"><mjx-c>𝜈</mjx-c></mjx-mi><mjx-mo data-semantic-added=\"true\" data-semantic- data-semantic-operator=\"infixop,⁢\" data-semantic-parent=\"5\" data-semantic-role=\"multiplication\" data-semantic-type=\"operator\"><mjx-c>⁢</mjx-c></mjx-mo><mjx-mi data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"unknown\" data-semantic-type=\"identifier\" space=\"2\"><mjx-c noic=\"true\" style=\"padding-top: 0.669em;\">N</mjx-c><mjx-c style=\"padding-top: 0.669em;\">S</mjx-c></mjx-mi></mjx-mrow></mjx-math></mjx-container> cross section on Xe of <mjx-container ctxtmenu_counter=\"44\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(27 (23 (22 0 (9 (8 1 (4 2 3)) (7 5 6)) 10) 11 (16 12 (15 13 14))) 17 18 (21 19 20))\"><mjx-mrow data-semantic-children=\"23,17,18,21\" data-semantic-collapsed=\"(27 (c 24 25 26) 23 17 18 21)\" data-semantic- data-semantic-owns=\"23 17 18 21\" data-semantic-role=\"text\" data-semantic-speech=\"left parenthesis 1.1 Subscript negative 0.5 Superscript plus 0.8 Baseline right parenthesis times 10 Superscript negative 39 Baseline c m squared\" data-semantic-type=\"punctuated\"><mjx-mrow data-semantic-added=\"true\" data-semantic-children=\"22,16\" data-semantic-content=\"11\" data-semantic- data-semantic-owns=\"22 11 16\" data-semantic-parent=\"27\" data-semantic-role=\"multiplication\" data-semantic-type=\"infixop\"><mjx-mrow data-semantic-added=\"true\" data-semantic-children=\"9\" data-semantic-content=\"0,10\" data-semantic- data-semantic-owns=\"0 9 10\" data-semantic-parent=\"23\" data-semantic-role=\"leftright\" data-semantic-type=\"fenced\"><mjx-mo data-semantic- data-semantic-operator=\"fenced\" data-semantic-parent=\"22\" data-semantic-role=\"open\" data-semantic-type=\"fence\" style=\"vertical-align: -0.02em;\"><mjx-c>(</mjx-c></mjx-mo><mjx-msubsup data-semantic-children=\"1,4,7\" data-semantic-collapsed=\"(9 (8 1 4) 7)\" data-semantic- data-semantic-owns=\"1 4 7\" data-semantic-parent=\"22\" data-semantic-role=\"float\" data-semantic-type=\"subsup\"><mjx-mrow><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"9\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.639em;\">1</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.639em;\">.</mjx-c><mjx-c style=\"padding-top: 0.639em;\">1</mjx-c></mjx-mn></mjx-mrow><mjx-script style=\"vertical-align: -0.275em; margin-left: 0px;\"><mjx-mrow data-semantic-children=\"6\" data-semantic-content=\"5\" data-semantic- data-semantic-owns=\"5 6\" data-semantic-parent=\"9\" data-semantic-role=\"positive\" data-semantic-type=\"prefixop\" size=\"s\"><mjx-mo data-semantic- data-semantic-operator=\"prefixop,+\" data-semantic-parent=\"7\" data-semantic-role=\"addition\" data-semantic-type=\"operator\"><mjx-c>+</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"7\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.647em;\">0</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.647em;\">.</mjx-c><mjx-c style=\"padding-top: 0.647em;\">8</mjx-c></mjx-mn></mjx-mrow><mjx-spacer style=\"margin-top: 0.204em;\"></mjx-spacer><mjx-mrow data-semantic-annotation=\"clearspeak:simple\" data-semantic-children=\"3\" data-semantic-content=\"2\" data-semantic- data-semantic-owns=\"2 3\" data-semantic-parent=\"9\" data-semantic-role=\"negative\" data-semantic-type=\"prefixop\" size=\"s\"><mjx-mo data-semantic- data-semantic-operator=\"prefixop,−\" data-semantic-parent=\"4\" data-semantic-role=\"subtraction\" data-semantic-type=\"operator\"><mjx-c>−</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"4\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.642em;\">0</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.642em;\">.</mjx-c><mjx-c style=\"padding-top: 0.642em;\">5</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msubsup><mjx-mo data-semantic- data-semantic-operator=\"fenced\" data-semantic-parent=\"22\" data-semantic-role=\"close\" data-semantic-type=\"fence\" style=\"vertical-align: -0.02em;\"><mjx-c>)</mjx-c></mjx-mo></mjx-mrow><mjx-mo data-semantic- data-semantic-operator=\"infixop,×\" data-semantic-parent=\"23\" data-semantic-role=\"multiplication\" data-semantic-type=\"operator\" space=\"3\"><mjx-c>×</mjx-c></mjx-mo><mjx-msup data-semantic-children=\"12,15\" data-semantic- data-semantic-owns=\"12 15\" data-semantic-parent=\"23\" data-semantic-role=\"integer\" data-semantic-type=\"superscript\" space=\"3\"><mjx-mrow><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"16\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.642em;\">1</mjx-c><mjx-c style=\"padding-top: 0.642em;\">0</mjx-c></mjx-mn></mjx-mrow><mjx-script style=\"vertical-align: 0.369em;\"><mjx-mrow data-semantic-annotation=\"clearspeak:simple\" data-semantic-children=\"14\" data-semantic-content=\"13\" data-semantic- data-semantic-owns=\"13 14\" data-semantic-parent=\"16\" data-semantic-role=\"negative\" data-semantic-type=\"prefixop\" size=\"s\"><mjx-mo data-semantic- data-semantic-operator=\"prefixop,−\" data-semantic-parent=\"15\" data-semantic-role=\"subtraction\" data-semantic-type=\"operator\"><mjx-c>−</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"15\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.646em;\">3</mjx-c><mjx-c style=\"padding-top: 0.646em;\">9</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msup></mjx-mrow><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic- data-semantic-parent=\"27\" data-semantic-role=\"space\" data-semantic-type=\"text\" style='font-family: MJX-STX-ZERO, \"Helvetica Neue\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\" variant=\"-explicitFont\"> </mjx-utext></mjx-mtext><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic- data-semantic-parent=\"27\" data-semantic-role=\"space\" data-semantic-type=\"text\" style='font-family: MJX-STX-ZERO, \"Helvetica Neue\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\" variant=\"-explicitFont\"> </mjx-utext></mjx-mtext><mjx-msup data-semantic-children=\"19,20\" data-semantic- data-semantic-owns=\"19 20\" data-semantic-parent=\"27\" data-semantic-role=\"unknown\" data-semantic-type=\"superscript\"><mjx-mrow><mjx-mi data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"21\" data-semantic-role=\"unknown\" data-semantic-type=\"identifier\"><mjx-c noic=\"true\" style=\"padding-top: 0.485em;\">c</mjx-c><mjx-c style=\"padding-top: 0.485em;\">m</mjx-c></mjx-mi></mjx-mrow><mjx-script style=\"vertical-align: 0.363em;\"><mjx-mrow size=\"s\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"21\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c>2</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msup></mjx-mrow></mjx-math></mjx-container> is consistent with the Standard Model prediction. This is the first direct measurement of nuclear recoils from solar neutrinos with a dark matter detector.","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":null,"pages":null},"PeriodicalIF":8.1000,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"First Indication of Solar8BNeutrinos via Coherent Elastic Neutrino-Nucleus Scattering with XENONnT\",\"authors\":\"E. Aprileet al.(XENON Collaboration)\",\"doi\":\"10.1103/physrevlett.133.191002\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We present the first measurement of nuclear recoils from solar <mjx-container ctxtmenu_counter=\\\"37\\\" ctxtmenu_oldtabindex=\\\"1\\\" jax=\\\"CHTML\\\" overflow=\\\"linebreak\\\" role=\\\"tree\\\" sre-explorer- style=\\\"font-size: 100.7%;\\\" tabindex=\\\"0\\\"><mjx-math data-semantic-structure=\\\"(5 0 1 2 3 4)\\\"><mjx-mrow><mjx-mmultiscripts data-semantic-children=\\\"0,1,2,3,4\\\" data-semantic-collapsed=\\\"(5 0 1 2 3 4)\\\" data-semantic- data-semantic-owns=\\\"0 1 2 3 4\\\" data-semantic-role=\\\"latinletter\\\" data-semantic-speech=\\\"Superscript 8 Baseline normal upper B\\\" data-semantic-type=\\\"tensor\\\"><mjx-prescripts style=\\\"vertical-align: 0.363em;\\\"><mjx-row><mjx-cell><mjx-mrow size=\\\"s\\\"><mjx-mn data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"5\\\" data-semantic-role=\\\"leftsuper\\\" data-semantic-type=\\\"number\\\"><mjx-c>8</mjx-c></mjx-mn></mjx-mrow></mjx-cell></mjx-row><mjx-row style=\\\"height: 0.602em;\\\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic- data-semantic-parent=\\\"5\\\" data-semantic-role=\\\"leftsub\\\" data-semantic-type=\\\"empty\\\" size=\\\"s\\\"></mjx-none></mjx-cell></mjx-row></mjx-prescripts><mjx-mrow><mjx-mi data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"5\\\" data-semantic-role=\\\"latinletter\\\" data-semantic-type=\\\"identifier\\\"><mjx-c>B</mjx-c></mjx-mi></mjx-mrow><mjx-scripts style=\\\"vertical-align: 0.363em;\\\"><mjx-row><mjx-cell><mjx-none data-semantic-added=\\\"true\\\" data-semantic- data-semantic-parent=\\\"5\\\" data-semantic-role=\\\"rightsuper\\\" data-semantic-type=\\\"empty\\\" size=\\\"s\\\"></mjx-none></mjx-cell></mjx-row><mjx-row style=\\\"height: 0.61em;\\\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic-added=\\\"true\\\" data-semantic- data-semantic-parent=\\\"5\\\" data-semantic-role=\\\"rightsub\\\" data-semantic-type=\\\"empty\\\" size=\\\"s\\\"></mjx-none></mjx-cell></mjx-row></mjx-scripts></mjx-mmultiscripts></mjx-mrow></mjx-math></mjx-container> neutrinos via coherent elastic neutrino-nucleus scattering with the XENONnT dark matter experiment. The central detector of XENONnT is a low-background, two-phase time projection chamber with a 5.9 t sensitive liquid xenon target. A blind analysis with an exposure of <mjx-container ctxtmenu_counter=\\\"38\\\" ctxtmenu_oldtabindex=\\\"1\\\" jax=\\\"CHTML\\\" overflow=\\\"linebreak\\\" role=\\\"tree\\\" sre-explorer- style=\\\"font-size: 100.7%;\\\" tabindex=\\\"0\\\"><mjx-math data-semantic-structure=\\\"(10 0 1 2 (6 3 4 5))\\\"><mjx-mrow data-semantic-children=\\\"0,1,2,6\\\" data-semantic-collapsed=\\\"(10 (c 7 8 9) 0 1 2 6)\\\" data-semantic- data-semantic-owns=\\\"0 1 2 6\\\" data-semantic-role=\\\"text\\\" data-semantic-speech=\\\"3.51 normal t times y r\\\" data-semantic-type=\\\"punctuated\\\"><mjx-mn data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"10\\\" data-semantic-role=\\\"float\\\" data-semantic-type=\\\"number\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.644em;\\\">3</mjx-c><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.644em;\\\">.</mjx-c><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.644em;\\\">5</mjx-c><mjx-c style=\\\"padding-top: 0.644em;\\\">1</mjx-c></mjx-mn><mjx-mtext data-semantic-annotation=\\\"clearspeak:unit\\\" data-semantic- data-semantic-parent=\\\"10\\\" data-semantic-role=\\\"space\\\" data-semantic-type=\\\"text\\\" style='font-family: MJX-STX-ZERO, \\\"Helvetica Neue\\\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\\\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\\\" variant=\\\"-explicitFont\\\"> </mjx-utext></mjx-mtext><mjx-mtext data-semantic-annotation=\\\"clearspeak:unit\\\" data-semantic- data-semantic-parent=\\\"10\\\" data-semantic-role=\\\"space\\\" data-semantic-type=\\\"text\\\" style='font-family: MJX-STX-ZERO, \\\"Helvetica Neue\\\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\\\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\\\" variant=\\\"-explicitFont\\\"> </mjx-utext></mjx-mtext><mjx-mrow data-semantic-added=\\\"true\\\" data-semantic-children=\\\"3,5\\\" data-semantic-content=\\\"4\\\" data-semantic- data-semantic-owns=\\\"3 4 5\\\" data-semantic-parent=\\\"10\\\" data-semantic-role=\\\"multiplication\\\" data-semantic-type=\\\"infixop\\\"><mjx-mi data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"6\\\" data-semantic-role=\\\"latinletter\\\" data-semantic-type=\\\"identifier\\\"><mjx-c>t</mjx-c></mjx-mi><mjx-mo data-semantic- data-semantic-operator=\\\"infixop,×\\\" data-semantic-parent=\\\"6\\\" data-semantic-role=\\\"multiplication\\\" data-semantic-type=\\\"operator\\\" space=\\\"3\\\"><mjx-c>×</mjx-c></mjx-mo><mjx-mi data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"6\\\" data-semantic-role=\\\"unknown\\\" data-semantic-type=\\\"identifier\\\" space=\\\"3\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.488em;\\\">y</mjx-c><mjx-c style=\\\"padding-top: 0.488em;\\\">r</mjx-c></mjx-mi></mjx-mrow></mjx-mrow></mjx-math></mjx-container> resulted in 37 observed events above 0.5 keV, with (<mjx-container ctxtmenu_counter=\\\"39\\\" ctxtmenu_oldtabindex=\\\"1\\\" jax=\\\"CHTML\\\" overflow=\\\"linebreak\\\" role=\\\"tree\\\" sre-explorer- style=\\\"font-size: 100.7%;\\\" tabindex=\\\"0\\\"><mjx-math data-semantic-structure=\\\"(8 (7 0 (3 1 2)) (6 4 5))\\\"><mjx-msubsup data-semantic-children=\\\"0,3,6\\\" data-semantic-collapsed=\\\"(8 (7 0 3) 6)\\\" data-semantic- data-semantic-owns=\\\"0 3 6\\\" data-semantic-role=\\\"float\\\" data-semantic-speech=\\\"26.4 Subscript negative 1.3 Superscript plus 1.4\\\" data-semantic-type=\\\"subsup\\\"><mjx-mn data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"8\\\" data-semantic-role=\\\"float\\\" data-semantic-type=\\\"number\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.646em;\\\">2</mjx-c><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.646em;\\\">6</mjx-c><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.646em;\\\">.</mjx-c><mjx-c style=\\\"padding-top: 0.646em;\\\">4</mjx-c></mjx-mn><mjx-script style=\\\"vertical-align: -0.276em; margin-left: 0px;\\\"><mjx-mrow data-semantic-children=\\\"5\\\" data-semantic-content=\\\"4\\\" data-semantic- data-semantic-owns=\\\"4 5\\\" data-semantic-parent=\\\"8\\\" data-semantic-role=\\\"positive\\\" data-semantic-type=\\\"prefixop\\\" size=\\\"s\\\"><mjx-mo data-semantic- data-semantic-operator=\\\"prefixop,+\\\" data-semantic-parent=\\\"6\\\" data-semantic-role=\\\"addition\\\" data-semantic-type=\\\"operator\\\"><mjx-c>+</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"6\\\" data-semantic-role=\\\"float\\\" data-semantic-type=\\\"number\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.645em;\\\">1</mjx-c><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.645em;\\\">.</mjx-c><mjx-c style=\\\"padding-top: 0.645em;\\\">4</mjx-c></mjx-mn></mjx-mrow><mjx-spacer style=\\\"margin-top: 0.204em;\\\"></mjx-spacer><mjx-mrow data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-children=\\\"2\\\" data-semantic-content=\\\"1\\\" data-semantic- data-semantic-owns=\\\"1 2\\\" data-semantic-parent=\\\"8\\\" data-semantic-role=\\\"negative\\\" data-semantic-type=\\\"prefixop\\\" size=\\\"s\\\"><mjx-mo data-semantic- data-semantic-operator=\\\"prefixop,−\\\" data-semantic-parent=\\\"3\\\" data-semantic-role=\\\"subtraction\\\" data-semantic-type=\\\"operator\\\"><mjx-c>−</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"3\\\" data-semantic-role=\\\"float\\\" data-semantic-type=\\\"number\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.644em;\\\">1</mjx-c><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.644em;\\\">.</mjx-c><mjx-c style=\\\"padding-top: 0.644em;\\\">3</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msubsup></mjx-math></mjx-container>) events expected from backgrounds. The background-only hypothesis is rejected with a statistical significance of <mjx-container ctxtmenu_counter=\\\"40\\\" ctxtmenu_oldtabindex=\\\"1\\\" jax=\\\"CHTML\\\" overflow=\\\"linebreak\\\" role=\\\"tree\\\" sre-explorer- style=\\\"font-size: 100.7%;\\\" tabindex=\\\"0\\\"><mjx-math data-semantic-structure=\\\"(3 0 2 1)\\\"><mjx-mrow data-semantic-annotation=\\\"clearspeak:simple;clearspeak:unit\\\" data-semantic-children=\\\"0,1\\\" data-semantic-content=\\\"2\\\" data-semantic- data-semantic-owns=\\\"0 2 1\\\" data-semantic-role=\\\"implicit\\\" data-semantic-speech=\\\"2.73 sigma\\\" data-semantic-type=\\\"infixop\\\"><mjx-mn data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"3\\\" data-semantic-role=\\\"float\\\" data-semantic-type=\\\"number\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.644em;\\\">2</mjx-c><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.644em;\\\">.</mjx-c><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.644em;\\\">7</mjx-c><mjx-c style=\\\"padding-top: 0.644em;\\\">3</mjx-c></mjx-mn><mjx-mo data-semantic-added=\\\"true\\\" data-semantic- data-semantic-operator=\\\"infixop,⁢\\\" data-semantic-parent=\\\"3\\\" data-semantic-role=\\\"multiplication\\\" data-semantic-type=\\\"operator\\\"><mjx-c>⁢</mjx-c></mjx-mo><mjx-mi data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"italic\\\" data-semantic- data-semantic-parent=\\\"3\\\" data-semantic-role=\\\"greekletter\\\" data-semantic-type=\\\"identifier\\\"><mjx-c>𝜎</mjx-c></mjx-mi></mjx-mrow></mjx-math></mjx-container>. The measured <mjx-container ctxtmenu_counter=\\\"41\\\" ctxtmenu_oldtabindex=\\\"1\\\" jax=\\\"CHTML\\\" overflow=\\\"linebreak\\\" role=\\\"tree\\\" sre-explorer- style=\\\"font-size: 100.7%;\\\" tabindex=\\\"0\\\"><mjx-math data-semantic-structure=\\\"(5 0 1 2 3 4)\\\"><mjx-mrow><mjx-mmultiscripts data-semantic-children=\\\"0,1,2,3,4\\\" data-semantic-collapsed=\\\"(5 0 1 2 3 4)\\\" data-semantic- data-semantic-owns=\\\"0 1 2 3 4\\\" data-semantic-role=\\\"latinletter\\\" data-semantic-speech=\\\"Superscript 8 Baseline normal upper B\\\" data-semantic-type=\\\"tensor\\\"><mjx-prescripts style=\\\"vertical-align: 0.363em;\\\"><mjx-row><mjx-cell><mjx-mrow size=\\\"s\\\"><mjx-mn data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"5\\\" data-semantic-role=\\\"leftsuper\\\" data-semantic-type=\\\"number\\\"><mjx-c>8</mjx-c></mjx-mn></mjx-mrow></mjx-cell></mjx-row><mjx-row style=\\\"height: 0.602em;\\\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic- data-semantic-parent=\\\"5\\\" data-semantic-role=\\\"leftsub\\\" data-semantic-type=\\\"empty\\\" size=\\\"s\\\"></mjx-none></mjx-cell></mjx-row></mjx-prescripts><mjx-mrow><mjx-mi data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"5\\\" data-semantic-role=\\\"latinletter\\\" data-semantic-type=\\\"identifier\\\"><mjx-c>B</mjx-c></mjx-mi></mjx-mrow><mjx-scripts style=\\\"vertical-align: 0.363em;\\\"><mjx-row><mjx-cell><mjx-none data-semantic-added=\\\"true\\\" data-semantic- data-semantic-parent=\\\"5\\\" data-semantic-role=\\\"rightsuper\\\" data-semantic-type=\\\"empty\\\" size=\\\"s\\\"></mjx-none></mjx-cell></mjx-row><mjx-row style=\\\"height: 0.61em;\\\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic-added=\\\"true\\\" data-semantic- data-semantic-parent=\\\"5\\\" data-semantic-role=\\\"rightsub\\\" data-semantic-type=\\\"empty\\\" size=\\\"s\\\"></mjx-none></mjx-cell></mjx-row></mjx-scripts></mjx-mmultiscripts></mjx-mrow></mjx-math></mjx-container> solar neutrino flux of <mjx-container ctxtmenu_counter=\\\"42\\\" ctxtmenu_oldtabindex=\\\"1\\\" jax=\\\"CHTML\\\" overflow=\\\"linebreak\\\" role=\\\"tree\\\" sre-explorer- style=\\\"font-size: 100.7%;\\\" tabindex=\\\"0\\\"><mjx-math data-semantic-structure=\\\"(35 (29 (28 0 (9 (8 1 (4 2 3)) (7 5 6)) 10) 11 (14 12 13)) 15 16 (21 17 (20 18 19)) 22 (27 23 (26 24 25)))\\\"><mjx-mrow data-semantic-children=\\\"29,15,16,21,22,27\\\" data-semantic-collapsed=\\\"(35 (c 30 31 32 33 34) 29 15 16 21 22 27)\\\" data-semantic- data-semantic-owns=\\\"29 15 16 21 22 27\\\" data-semantic-role=\\\"text\\\" data-semantic-speech=\\\"left parenthesis 4.7 Subscript negative 2.3 Superscript plus 3.6 Baseline right parenthesis times 10 Superscript 6 Baseline c m Superscript negative 2 Baseline normal s Superscript negative 1\\\" data-semantic-type=\\\"punctuated\\\"><mjx-mrow data-semantic-added=\\\"true\\\" data-semantic-children=\\\"28,14\\\" data-semantic-content=\\\"11\\\" data-semantic- data-semantic-owns=\\\"28 11 14\\\" data-semantic-parent=\\\"35\\\" data-semantic-role=\\\"multiplication\\\" data-semantic-type=\\\"infixop\\\"><mjx-mrow data-semantic-added=\\\"true\\\" data-semantic-children=\\\"9\\\" data-semantic-content=\\\"0,10\\\" data-semantic- data-semantic-owns=\\\"0 9 10\\\" data-semantic-parent=\\\"29\\\" data-semantic-role=\\\"leftright\\\" data-semantic-type=\\\"fenced\\\"><mjx-mo data-semantic- data-semantic-operator=\\\"fenced\\\" data-semantic-parent=\\\"28\\\" data-semantic-role=\\\"open\\\" data-semantic-type=\\\"fence\\\" style=\\\"vertical-align: -0.02em;\\\"><mjx-c>(</mjx-c></mjx-mo><mjx-msubsup data-semantic-children=\\\"1,4,7\\\" data-semantic-collapsed=\\\"(9 (8 1 4) 7)\\\" data-semantic- data-semantic-owns=\\\"1 4 7\\\" data-semantic-parent=\\\"28\\\" data-semantic-role=\\\"float\\\" data-semantic-type=\\\"subsup\\\"><mjx-mrow><mjx-mn data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"9\\\" data-semantic-role=\\\"float\\\" data-semantic-type=\\\"number\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.645em;\\\">4</mjx-c><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.645em;\\\">.</mjx-c><mjx-c style=\\\"padding-top: 0.645em;\\\">7</mjx-c></mjx-mn></mjx-mrow><mjx-script style=\\\"vertical-align: -0.276em; margin-left: 0px;\\\"><mjx-mrow data-semantic-children=\\\"6\\\" data-semantic-content=\\\"5\\\" data-semantic- data-semantic-owns=\\\"5 6\\\" data-semantic-parent=\\\"9\\\" data-semantic-role=\\\"positive\\\" data-semantic-type=\\\"prefixop\\\" size=\\\"s\\\"><mjx-mo data-semantic- data-semantic-operator=\\\"prefixop,+\\\" data-semantic-parent=\\\"7\\\" data-semantic-role=\\\"addition\\\" data-semantic-type=\\\"operator\\\"><mjx-c>+</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"7\\\" data-semantic-role=\\\"float\\\" data-semantic-type=\\\"number\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.646em;\\\">3</mjx-c><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.646em;\\\">.</mjx-c><mjx-c style=\\\"padding-top: 0.646em;\\\">6</mjx-c></mjx-mn></mjx-mrow><mjx-spacer style=\\\"margin-top: 0.204em;\\\"></mjx-spacer><mjx-mrow data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-children=\\\"3\\\" data-semantic-content=\\\"2\\\" data-semantic- data-semantic-owns=\\\"2 3\\\" data-semantic-parent=\\\"9\\\" data-semantic-role=\\\"negative\\\" data-semantic-type=\\\"prefixop\\\" size=\\\"s\\\"><mjx-mo data-semantic- data-semantic-operator=\\\"prefixop,−\\\" data-semantic-parent=\\\"4\\\" data-semantic-role=\\\"subtraction\\\" data-semantic-type=\\\"operator\\\"><mjx-c>−</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"4\\\" data-semantic-role=\\\"float\\\" data-semantic-type=\\\"number\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.644em;\\\">2</mjx-c><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.644em;\\\">.</mjx-c><mjx-c style=\\\"padding-top: 0.644em;\\\">3</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msubsup><mjx-mo data-semantic- data-semantic-operator=\\\"fenced\\\" data-semantic-parent=\\\"28\\\" data-semantic-role=\\\"close\\\" data-semantic-type=\\\"fence\\\" style=\\\"vertical-align: -0.02em;\\\"><mjx-c>)</mjx-c></mjx-mo></mjx-mrow><mjx-mo data-semantic- data-semantic-operator=\\\"infixop,×\\\" data-semantic-parent=\\\"29\\\" data-semantic-role=\\\"multiplication\\\" data-semantic-type=\\\"operator\\\" space=\\\"3\\\"><mjx-c>×</mjx-c></mjx-mo><mjx-msup data-semantic-children=\\\"12,13\\\" data-semantic- data-semantic-owns=\\\"12 13\\\" data-semantic-parent=\\\"29\\\" data-semantic-role=\\\"integer\\\" data-semantic-type=\\\"superscript\\\" space=\\\"3\\\"><mjx-mrow><mjx-mn data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"14\\\" data-semantic-role=\\\"integer\\\" data-semantic-type=\\\"number\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.642em;\\\">1</mjx-c><mjx-c style=\\\"padding-top: 0.642em;\\\">0</mjx-c></mjx-mn></mjx-mrow><mjx-script style=\\\"vertical-align: 0.369em;\\\"><mjx-mrow size=\\\"s\\\"><mjx-mn data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"14\\\" data-semantic-role=\\\"integer\\\" data-semantic-type=\\\"number\\\"><mjx-c>6</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msup></mjx-mrow><mjx-mtext data-semantic-annotation=\\\"clearspeak:unit\\\" data-semantic- data-semantic-parent=\\\"35\\\" data-semantic-role=\\\"space\\\" data-semantic-type=\\\"text\\\" style='font-family: MJX-STX-ZERO, \\\"Helvetica Neue\\\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\\\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\\\" variant=\\\"-explicitFont\\\"> </mjx-utext></mjx-mtext><mjx-mtext data-semantic-annotation=\\\"clearspeak:unit\\\" data-semantic- data-semantic-parent=\\\"35\\\" data-semantic-role=\\\"space\\\" data-semantic-type=\\\"text\\\" style='font-family: MJX-STX-ZERO, \\\"Helvetica Neue\\\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\\\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\\\" variant=\\\"-explicitFont\\\"> </mjx-utext></mjx-mtext><mjx-msup data-semantic-children=\\\"17,20\\\" data-semantic- data-semantic-owns=\\\"17 20\\\" data-semantic-parent=\\\"35\\\" data-semantic-role=\\\"unknown\\\" data-semantic-type=\\\"superscript\\\"><mjx-mrow><mjx-mi data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"21\\\" data-semantic-role=\\\"unknown\\\" data-semantic-type=\\\"identifier\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.485em;\\\">c</mjx-c><mjx-c style=\\\"padding-top: 0.485em;\\\">m</mjx-c></mjx-mi></mjx-mrow><mjx-script style=\\\"vertical-align: 0.363em;\\\"><mjx-mrow data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-children=\\\"19\\\" data-semantic-content=\\\"18\\\" data-semantic- data-semantic-owns=\\\"18 19\\\" data-semantic-parent=\\\"21\\\" data-semantic-role=\\\"negative\\\" data-semantic-type=\\\"prefixop\\\" size=\\\"s\\\"><mjx-mo data-semantic- data-semantic-operator=\\\"prefixop,−\\\" data-semantic-parent=\\\"20\\\" data-semantic-role=\\\"subtraction\\\" data-semantic-type=\\\"operator\\\"><mjx-c>−</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"20\\\" data-semantic-role=\\\"integer\\\" data-semantic-type=\\\"number\\\"><mjx-c>2</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msup><mjx-mtext data-semantic-annotation=\\\"clearspeak:unit\\\" data-semantic- data-semantic-parent=\\\"35\\\" data-semantic-role=\\\"space\\\" data-semantic-type=\\\"text\\\" style='font-family: MJX-STX-ZERO, \\\"Helvetica Neue\\\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\\\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\\\" variant=\\\"-explicitFont\\\"> </mjx-utext></mjx-mtext><mjx-msup data-semantic-children=\\\"23,26\\\" data-semantic- data-semantic-owns=\\\"23 26\\\" data-semantic-parent=\\\"35\\\" data-semantic-role=\\\"latinletter\\\" data-semantic-type=\\\"superscript\\\"><mjx-mrow><mjx-mi data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"27\\\" data-semantic-role=\\\"latinletter\\\" data-semantic-type=\\\"identifier\\\"><mjx-c>s</mjx-c></mjx-mi></mjx-mrow><mjx-script style=\\\"vertical-align: 0.363em;\\\"><mjx-mrow data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-children=\\\"25\\\" data-semantic-content=\\\"24\\\" data-semantic- data-semantic-owns=\\\"24 25\\\" data-semantic-parent=\\\"27\\\" data-semantic-role=\\\"negative\\\" data-semantic-type=\\\"prefixop\\\" size=\\\"s\\\"><mjx-mo data-semantic- data-semantic-operator=\\\"prefixop,−\\\" data-semantic-parent=\\\"26\\\" data-semantic-role=\\\"subtraction\\\" data-semantic-type=\\\"operator\\\"><mjx-c>−</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"26\\\" data-semantic-role=\\\"integer\\\" data-semantic-type=\\\"number\\\"><mjx-c>1</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msup></mjx-mrow></mjx-math></mjx-container> is consistent with results from the Sudbury Neutrino Observatory. The measured neutrino flux-weighted <mjx-container ctxtmenu_counter=\\\"43\\\" ctxtmenu_oldtabindex=\\\"1\\\" jax=\\\"CHTML\\\" overflow=\\\"linebreak\\\" role=\\\"tree\\\" sre-explorer- style=\\\"font-size: 100.7%;\\\" tabindex=\\\"0\\\"><mjx-math data-semantic-structure=\\\"(5 0 3 1 4 2)\\\"><mjx-mrow data-semantic-annotation=\\\"clearspeak:unit\\\" data-semantic-children=\\\"0,1,2\\\" data-semantic-content=\\\"3,4\\\" data-semantic- data-semantic-owns=\\\"0 3 1 4 2\\\" data-semantic-role=\\\"implicit\\\" data-semantic-speech=\\\"upper C upper E nu upper N upper S\\\" data-semantic-type=\\\"infixop\\\"><mjx-mi data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"5\\\" data-semantic-role=\\\"unknown\\\" data-semantic-type=\\\"identifier\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.669em;\\\">C</mjx-c><mjx-c style=\\\"padding-top: 0.669em;\\\">E</mjx-c></mjx-mi><mjx-mo data-semantic-added=\\\"true\\\" data-semantic- data-semantic-operator=\\\"infixop,⁢\\\" data-semantic-parent=\\\"5\\\" data-semantic-role=\\\"multiplication\\\" data-semantic-type=\\\"operator\\\"><mjx-c>⁢</mjx-c></mjx-mo><mjx-mi data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"italic\\\" data-semantic- data-semantic-parent=\\\"5\\\" data-semantic-role=\\\"greekletter\\\" data-semantic-type=\\\"identifier\\\" space=\\\"2\\\"><mjx-c>𝜈</mjx-c></mjx-mi><mjx-mo data-semantic-added=\\\"true\\\" data-semantic- data-semantic-operator=\\\"infixop,⁢\\\" data-semantic-parent=\\\"5\\\" data-semantic-role=\\\"multiplication\\\" data-semantic-type=\\\"operator\\\"><mjx-c>⁢</mjx-c></mjx-mo><mjx-mi data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"5\\\" data-semantic-role=\\\"unknown\\\" data-semantic-type=\\\"identifier\\\" space=\\\"2\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.669em;\\\">N</mjx-c><mjx-c style=\\\"padding-top: 0.669em;\\\">S</mjx-c></mjx-mi></mjx-mrow></mjx-math></mjx-container> cross section on Xe of <mjx-container ctxtmenu_counter=\\\"44\\\" ctxtmenu_oldtabindex=\\\"1\\\" jax=\\\"CHTML\\\" overflow=\\\"linebreak\\\" role=\\\"tree\\\" sre-explorer- style=\\\"font-size: 100.7%;\\\" tabindex=\\\"0\\\"><mjx-math data-semantic-structure=\\\"(27 (23 (22 0 (9 (8 1 (4 2 3)) (7 5 6)) 10) 11 (16 12 (15 13 14))) 17 18 (21 19 20))\\\"><mjx-mrow data-semantic-children=\\\"23,17,18,21\\\" data-semantic-collapsed=\\\"(27 (c 24 25 26) 23 17 18 21)\\\" data-semantic- data-semantic-owns=\\\"23 17 18 21\\\" data-semantic-role=\\\"text\\\" data-semantic-speech=\\\"left parenthesis 1.1 Subscript negative 0.5 Superscript plus 0.8 Baseline right parenthesis times 10 Superscript negative 39 Baseline c m squared\\\" data-semantic-type=\\\"punctuated\\\"><mjx-mrow data-semantic-added=\\\"true\\\" data-semantic-children=\\\"22,16\\\" data-semantic-content=\\\"11\\\" data-semantic- data-semantic-owns=\\\"22 11 16\\\" data-semantic-parent=\\\"27\\\" data-semantic-role=\\\"multiplication\\\" data-semantic-type=\\\"infixop\\\"><mjx-mrow data-semantic-added=\\\"true\\\" data-semantic-children=\\\"9\\\" data-semantic-content=\\\"0,10\\\" data-semantic- data-semantic-owns=\\\"0 9 10\\\" data-semantic-parent=\\\"23\\\" data-semantic-role=\\\"leftright\\\" data-semantic-type=\\\"fenced\\\"><mjx-mo data-semantic- data-semantic-operator=\\\"fenced\\\" data-semantic-parent=\\\"22\\\" data-semantic-role=\\\"open\\\" data-semantic-type=\\\"fence\\\" style=\\\"vertical-align: -0.02em;\\\"><mjx-c>(</mjx-c></mjx-mo><mjx-msubsup data-semantic-children=\\\"1,4,7\\\" data-semantic-collapsed=\\\"(9 (8 1 4) 7)\\\" data-semantic- data-semantic-owns=\\\"1 4 7\\\" data-semantic-parent=\\\"22\\\" data-semantic-role=\\\"float\\\" data-semantic-type=\\\"subsup\\\"><mjx-mrow><mjx-mn data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"9\\\" data-semantic-role=\\\"float\\\" data-semantic-type=\\\"number\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.639em;\\\">1</mjx-c><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.639em;\\\">.</mjx-c><mjx-c style=\\\"padding-top: 0.639em;\\\">1</mjx-c></mjx-mn></mjx-mrow><mjx-script style=\\\"vertical-align: -0.275em; margin-left: 0px;\\\"><mjx-mrow data-semantic-children=\\\"6\\\" data-semantic-content=\\\"5\\\" data-semantic- data-semantic-owns=\\\"5 6\\\" data-semantic-parent=\\\"9\\\" data-semantic-role=\\\"positive\\\" data-semantic-type=\\\"prefixop\\\" size=\\\"s\\\"><mjx-mo data-semantic- data-semantic-operator=\\\"prefixop,+\\\" data-semantic-parent=\\\"7\\\" data-semantic-role=\\\"addition\\\" data-semantic-type=\\\"operator\\\"><mjx-c>+</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"7\\\" data-semantic-role=\\\"float\\\" data-semantic-type=\\\"number\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.647em;\\\">0</mjx-c><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.647em;\\\">.</mjx-c><mjx-c style=\\\"padding-top: 0.647em;\\\">8</mjx-c></mjx-mn></mjx-mrow><mjx-spacer style=\\\"margin-top: 0.204em;\\\"></mjx-spacer><mjx-mrow data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-children=\\\"3\\\" data-semantic-content=\\\"2\\\" data-semantic- data-semantic-owns=\\\"2 3\\\" data-semantic-parent=\\\"9\\\" data-semantic-role=\\\"negative\\\" data-semantic-type=\\\"prefixop\\\" size=\\\"s\\\"><mjx-mo data-semantic- data-semantic-operator=\\\"prefixop,−\\\" data-semantic-parent=\\\"4\\\" data-semantic-role=\\\"subtraction\\\" data-semantic-type=\\\"operator\\\"><mjx-c>−</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"4\\\" data-semantic-role=\\\"float\\\" data-semantic-type=\\\"number\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.642em;\\\">0</mjx-c><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.642em;\\\">.</mjx-c><mjx-c style=\\\"padding-top: 0.642em;\\\">5</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msubsup><mjx-mo data-semantic- data-semantic-operator=\\\"fenced\\\" data-semantic-parent=\\\"22\\\" data-semantic-role=\\\"close\\\" data-semantic-type=\\\"fence\\\" style=\\\"vertical-align: -0.02em;\\\"><mjx-c>)</mjx-c></mjx-mo></mjx-mrow><mjx-mo data-semantic- data-semantic-operator=\\\"infixop,×\\\" data-semantic-parent=\\\"23\\\" data-semantic-role=\\\"multiplication\\\" data-semantic-type=\\\"operator\\\" space=\\\"3\\\"><mjx-c>×</mjx-c></mjx-mo><mjx-msup data-semantic-children=\\\"12,15\\\" data-semantic- data-semantic-owns=\\\"12 15\\\" data-semantic-parent=\\\"23\\\" data-semantic-role=\\\"integer\\\" data-semantic-type=\\\"superscript\\\" space=\\\"3\\\"><mjx-mrow><mjx-mn data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"16\\\" data-semantic-role=\\\"integer\\\" data-semantic-type=\\\"number\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.642em;\\\">1</mjx-c><mjx-c style=\\\"padding-top: 0.642em;\\\">0</mjx-c></mjx-mn></mjx-mrow><mjx-script style=\\\"vertical-align: 0.369em;\\\"><mjx-mrow data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-children=\\\"14\\\" data-semantic-content=\\\"13\\\" data-semantic- data-semantic-owns=\\\"13 14\\\" data-semantic-parent=\\\"16\\\" data-semantic-role=\\\"negative\\\" data-semantic-type=\\\"prefixop\\\" size=\\\"s\\\"><mjx-mo data-semantic- data-semantic-operator=\\\"prefixop,−\\\" data-semantic-parent=\\\"15\\\" data-semantic-role=\\\"subtraction\\\" data-semantic-type=\\\"operator\\\"><mjx-c>−</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\\\"clearspeak:simple\\\" data-semantic-font=\\\"normal\\\" data-semantic- data-semantic-parent=\\\"15\\\" data-semantic-role=\\\"integer\\\" data-semantic-type=\\\"number\\\"><mjx-c noic=\\\"true\\\" style=\\\"padding-top: 0.646em;\\\">3</mjx-c><mjx-c style=\\\"padding-top: 0.646em;\\\">9</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msup></mjx-mrow><mjx-mtext data-semantic-annotation=\\\"clearspeak:unit\\\" data-semantic- data-semantic-parent=\\\"27\\\" data-semantic-role=\\\"space\\\" data-semantic-type=\\\"text\\\" style='font-family: MJX-STX-ZERO, \\\"Helvetica Neue\\\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\\\"font-size: 90.6%; 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引用次数: 0

摘要

我们介绍了利用 XENONnT 暗物质实验通过相干弹性中微子-核散射首次测量太阳 8B 中微子的核反冲。XENONnT 的中心探测器是一个低背景、两相时间投影室,带有一个 5.9 吨灵敏度的液态氙靶。以 3.51 吨×年的曝光量进行盲分析,结果观测到 37 个 0.5 keV 以上的事件,预计有 (26.4+1.4-1.3) 个事件来自背景。以 2.73𝜎的统计显著性拒绝了纯背景假说。测得的8B太阳中微子通量为(4.7+3.6-2.3)×106 cm-2 s-1,与萨德伯里中微子观测站的结果一致。测量到的中微子通量加权对 Xe 的 CE𝜈NS 截面为 (1.1+0.8-0.5)×10-39 cm2,与标准模型的预测一致。这是首次用暗物质探测器直接测量太阳中微子的核反冲。
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First Indication of Solar8BNeutrinos via Coherent Elastic Neutrino-Nucleus Scattering with XENONnT
We present the first measurement of nuclear recoils from solar 8B neutrinos via coherent elastic neutrino-nucleus scattering with the XENONnT dark matter experiment. The central detector of XENONnT is a low-background, two-phase time projection chamber with a 5.9 t sensitive liquid xenon target. A blind analysis with an exposure of 3.51t×yr resulted in 37 observed events above 0.5 keV, with (26.4+1.41.3) events expected from backgrounds. The background-only hypothesis is rejected with a statistical significance of 2.73𝜎. The measured 8B solar neutrino flux of (4.7+3.62.3)×106cm2s1 is consistent with results from the Sudbury Neutrino Observatory. The measured neutrino flux-weighted CE𝜈NS cross section on Xe of (1.1+0.80.5)×1039cm2 is consistent with the Standard Model prediction. This is the first direct measurement of nuclear recoils from solar neutrinos with a dark matter detector.
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来源期刊
Physical review letters
Physical review letters 物理-物理:综合
CiteScore
16.50
自引率
7.00%
发文量
2673
审稿时长
2.2 months
期刊介绍: Physical review letters(PRL)covers the full range of applied, fundamental, and interdisciplinary physics research topics: General physics, including statistical and quantum mechanics and quantum information Gravitation, astrophysics, and cosmology Elementary particles and fields Nuclear physics Atomic, molecular, and optical physics Nonlinear dynamics, fluid dynamics, and classical optics Plasma and beam physics Condensed matter and materials physics Polymers, soft matter, biological, climate and interdisciplinary physics, including networks
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