Pub Date : 2025-09-08DOI: 10.1016/j.nds.2025.08.001
M. Shamsuzzoha Basunia , Anagha Chakraborty
Evaluated spectroscopic data and level schemes are presented for 25N (unobserved), 25O, 25F, 25Ne, 25Na, 25Mg, 25Al, 25Si, and 25P based on the measured decay and nuclear reaction studies. This evaluation for A=25 supersedes the earlier one by R.B. Firestone (2009Fi05). Overall the decay datasets associated with 25Ne, 25Na, and 25Mg remain the same compared with those in the previous evaluation, 2009Fi05, however, new β-n decay datasets are added in 25Ne along with new reaction datasets almost for all of the above mentioned nuclides from older and new references.
Other highlights of this evaluation are the following:
Ground state of 25O is neutron unbound. Several new articles reported resonance energies of this nuclide, studied using radioactive beams, like 24O,27Ne, 26F, etc. These results have been included in this evaluation.
Due to the lack of direct experimental evidence, a tentative (5/2+) assignment for the ground state and no spin-parity assignments for the known excited states of 25Si has been adopted in the present evaluation.
In the absence of experimental evidence, tentative (1/2+) assignment has been adopted for the ground state of 25P. As suggested in 2015Fe02, light-ion scattering experiment in the inverse kinematics seems to be a probable probe for investigating the low-lying states of 25P, which are the mirror analogs of the states of 25Ne.
{"title":"Nuclear Structure and Decay Data for A=25 Isobar","authors":"M. Shamsuzzoha Basunia , Anagha Chakraborty","doi":"10.1016/j.nds.2025.08.001","DOIUrl":"10.1016/j.nds.2025.08.001","url":null,"abstract":"<div><div>Evaluated spectroscopic data and level schemes are presented for <sup>25</sup>N (unobserved), <sup>25</sup>O, <sup>25</sup>F, <sup>25</sup>Ne, <sup>25</sup>Na, <sup>25</sup>Mg, <sup>25</sup>Al, <sup>25</sup>Si, and <sup>25</sup>P based on the measured decay and nuclear reaction studies. This evaluation for A=25 supersedes the earlier one by R.B. Firestone (2009Fi05). Overall the decay datasets associated with <sup>25</sup>Ne, <sup>25</sup>Na, and <sup>25</sup>Mg remain the same compared with those in the previous evaluation, 2009Fi05, however, new <em>β</em>-n decay datasets are added in <sup>25</sup>Ne along with new reaction datasets almost for all of the above mentioned nuclides from older and new references.</div><div>Other highlights of this evaluation are the following:</div><div>Ground state of <sup>25</sup>O is neutron unbound. Several new articles reported resonance energies of this nuclide, studied using radioactive beams, like <sup>24</sup>O,<sup>27</sup>Ne, <sup>26</sup>F, etc. These results have been included in this evaluation.</div><div>Due to the lack of direct experimental evidence, a tentative (5/2<sup>+</sup>) assignment for the ground state and no spin-parity assignments for the known excited states of <sup>25</sup>Si has been adopted in the present evaluation.</div><div>In the absence of experimental evidence, tentative (1/2<sup>+</sup>) assignment has been adopted for the ground state of <sup>25</sup>P. As suggested in 2015Fe02, light-ion scattering experiment in the inverse kinematics seems to be a probable probe for investigating the low-lying states of <sup>25</sup>P, which are the mirror analogs of the states of <sup>25</sup>Ne.</div></div>","PeriodicalId":49735,"journal":{"name":"Nuclear Data Sheets","volume":"205 ","pages":"Pages 1-188"},"PeriodicalIF":2.7,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145011299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-08DOI: 10.1016/S0090-3752(25)00072-9
{"title":"Nuclear Data Sheets Symbols and Abbreviations","authors":"","doi":"10.1016/S0090-3752(25)00072-9","DOIUrl":"10.1016/S0090-3752(25)00072-9","url":null,"abstract":"","PeriodicalId":49735,"journal":{"name":"Nuclear Data Sheets","volume":"205 ","pages":"Page IBC"},"PeriodicalIF":2.7,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145011300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-05DOI: 10.1016/j.nds.2025.07.001
Balraj Singh, Huang Xiaolong, Wang Xianghan
Experimental nuclear spectroscopic data are evaluated for 12 known nuclides of mass number A=62 (Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge). Detailed evaluated information are presented for each reaction and decay. Recommended values combining all available data are provided for all the spectroscopic properties of each level, <ce:italic>γ</ce:italic>-ray, and decay radiation. Following is the status of structure and decay information available for each of the nuclides. <ce:sup loc="pre">62</ce:sup>Sc: only the isotopic identification has been made, with unknown half-life of its g.s., and its decay scheme. <ce:sup loc="pre">62</ce:sup>Ti: half-life of the g.s. is unknown, but the first (2<ce:sup loc="post">+</ce:sup>) and (4<ce:sup loc="post">+</ce:sup>) states have been reported, the second at 1506 keV. <ce:sup loc="pre">62</ce:sup>V: information is available for only the ground state, its decay scheme is poorly known, with three <ce:italic>γ</ce:italic> rays, and one level in <ce:sup loc="pre">62</ce:sup>Cr. <ce:sup loc="pre">62</ce:sup>Cr: only three excited states are known up to 1458 keV, with half-life of one excited state. Its decay scheme is poorly known, with five <ce:italic>γ</ce:italic> rays and three levels in the daughter nucleus. <ce:sup loc="pre">62</ce:sup>Mn: two beta-decaying activities are known, but with poorly known decay schemes. Ten excited states are known up to 1531 keV, and up to J=(8), but with no half-life known for any of the excited states. <ce:sup loc="pre">62</ce:sup>Fe: 23 excited states are known up to 5475 keV, and up to 10<ce:sup loc="post">+</ce:sup>, with the half-lives known for only the first 2<ce:sup loc="post">+</ce:sup> and 4<ce:sup loc="post">+</ce:sup> states. Its decay scheme is poorly known with only one <ce:italic>γ</ce:italic> ray and one level in <ce:sup loc="pre">62</ce:sup>Co. <ce:sup loc="pre">62</ce:sup>Co: two beta-decaying activities are known, with their decay decay schemes fairly well established. Large number of levels are up to 6950 keV, and up to (13<ce:sup loc="post">+</ce:sup>), but half-lives of only two excited states are known. <ce:sup loc="pre">62</ce:sup>Ni: stable nucleus with a large number of levels known up to 24.5 MeV excitation, and up to (24<ce:sup loc="post">−</ce:sup>). Half-lives of 30 excited states are known. <ce:sup loc="pre">62</ce:sup>Cu: a large number of levels are known up to 10.9 MeV excitation, and up to (14<ce:sup loc="post">+</ce:sup>), but half-lives known for only seven excited states. Its decay scheme is fairly well established. <ce:sup loc="pre">62</ce:sup>Zn: a rare nucleus with co-existence of many different types of structures: five superdeformed bands, 11 well-deformed bands, two terminating bands, and nine normal-deformed bands, up to an excitation energy of 42.5 MeV, and up to (35<ce:sup loc="post">−</ce:sup>), with half-lives known for 18 excited states. Its decay scheme is well established. <ce:sup loc="pre">62</ce:sup>Ga: many levels are know
{"title":"Nuclear Structure and Decay Data for A=62 Isobars","authors":"Balraj Singh, Huang Xiaolong, Wang Xianghan","doi":"10.1016/j.nds.2025.07.001","DOIUrl":"https://doi.org/10.1016/j.nds.2025.07.001","url":null,"abstract":"Experimental nuclear spectroscopic data are evaluated for 12 known nuclides of mass number A=62 (Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge). Detailed evaluated information are presented for each reaction and decay. Recommended values combining all available data are provided for all the spectroscopic properties of each level, <ce:italic>γ</ce:italic>-ray, and decay radiation. Following is the status of structure and decay information available for each of the nuclides. <ce:sup loc=\"pre\">62</ce:sup>Sc: only the isotopic identification has been made, with unknown half-life of its g.s., and its decay scheme. <ce:sup loc=\"pre\">62</ce:sup>Ti: half-life of the g.s. is unknown, but the first (2<ce:sup loc=\"post\">+</ce:sup>) and (4<ce:sup loc=\"post\">+</ce:sup>) states have been reported, the second at 1506 keV. <ce:sup loc=\"pre\">62</ce:sup>V: information is available for only the ground state, its decay scheme is poorly known, with three <ce:italic>γ</ce:italic> rays, and one level in <ce:sup loc=\"pre\">62</ce:sup>Cr. <ce:sup loc=\"pre\">62</ce:sup>Cr: only three excited states are known up to 1458 keV, with half-life of one excited state. Its decay scheme is poorly known, with five <ce:italic>γ</ce:italic> rays and three levels in the daughter nucleus. <ce:sup loc=\"pre\">62</ce:sup>Mn: two beta-decaying activities are known, but with poorly known decay schemes. Ten excited states are known up to 1531 keV, and up to J=(8), but with no half-life known for any of the excited states. <ce:sup loc=\"pre\">62</ce:sup>Fe: 23 excited states are known up to 5475 keV, and up to 10<ce:sup loc=\"post\">+</ce:sup>, with the half-lives known for only the first 2<ce:sup loc=\"post\">+</ce:sup> and 4<ce:sup loc=\"post\">+</ce:sup> states. Its decay scheme is poorly known with only one <ce:italic>γ</ce:italic> ray and one level in <ce:sup loc=\"pre\">62</ce:sup>Co. <ce:sup loc=\"pre\">62</ce:sup>Co: two beta-decaying activities are known, with their decay decay schemes fairly well established. Large number of levels are up to 6950 keV, and up to (13<ce:sup loc=\"post\">+</ce:sup>), but half-lives of only two excited states are known. <ce:sup loc=\"pre\">62</ce:sup>Ni: stable nucleus with a large number of levels known up to 24.5 MeV excitation, and up to (24<ce:sup loc=\"post\">−</ce:sup>). Half-lives of 30 excited states are known. <ce:sup loc=\"pre\">62</ce:sup>Cu: a large number of levels are known up to 10.9 MeV excitation, and up to (14<ce:sup loc=\"post\">+</ce:sup>), but half-lives known for only seven excited states. Its decay scheme is fairly well established. <ce:sup loc=\"pre\">62</ce:sup>Zn: a rare nucleus with co-existence of many different types of structures: five superdeformed bands, 11 well-deformed bands, two terminating bands, and nine normal-deformed bands, up to an excitation energy of 42.5 MeV, and up to (35<ce:sup loc=\"post\">−</ce:sup>), with half-lives known for 18 excited states. Its decay scheme is well established. <ce:sup loc=\"pre\">62</ce:sup>Ga: many levels are know","PeriodicalId":49735,"journal":{"name":"Nuclear Data Sheets","volume":"186 1","pages":"1-373"},"PeriodicalIF":3.7,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144900047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-05DOI: 10.1016/j.nds.2025.07.002
C.D. Nesaraja
Available information pertaining to the nuclear structure of ground and excited states for all known nuclei with mass numbers A=248 has been compiled and evaluated. The adopted level and decay schemes, as well as the detailed nuclear properties and configuration assignments based on experimental data, are presented for these nuclides. When there are insufficient data, expected values from systematics of nuclear properties and/or theoretical calculations are utilized. Unexpected or discrepant experimental results are also noted. This work supersedes the 2014 evaluation by M.J. Martin (2014Ma86).
关于所有已知质量数为A=248的原子核的基态和激发态核结构的现有信息已被汇编和评估。给出了这些核素所采用的能级和衰变方案，以及基于实验数据的详细核性质和组态分配。当数据不足时，利用核性质系统学和（或）理论计算的期望值。意外的或不一致的实验结果也被注意到。这项工作取代了2014年M.J. Martin （2014Ma86）的评估。
{"title":"Nuclear Data Sheets for A=248","authors":"C.D. Nesaraja","doi":"10.1016/j.nds.2025.07.002","DOIUrl":"https://doi.org/10.1016/j.nds.2025.07.002","url":null,"abstract":"Available information pertaining to the nuclear structure of ground and excited states for all known nuclei with mass numbers A=248 has been compiled and evaluated. The adopted level and decay schemes, as well as the detailed nuclear properties and configuration assignments based on experimental data, are presented for these nuclides. When there are insufficient data, expected values from systematics of nuclear properties and/or theoretical calculations are utilized. Unexpected or discrepant experimental results are also noted. This work supersedes the 2014 evaluation by M.J. Martin (2014Ma86).","PeriodicalId":49735,"journal":{"name":"Nuclear Data Sheets","volume":"13 1","pages":"374-441"},"PeriodicalIF":3.7,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144900048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-05DOI: 10.1016/s0090-3752(25)00061-4
{"title":"Nuclear Data Sheets Symbols and Abbreviations","authors":"","doi":"10.1016/s0090-3752(25)00061-4","DOIUrl":"https://doi.org/10.1016/s0090-3752(25)00061-4","url":null,"abstract":"","PeriodicalId":49735,"journal":{"name":"Nuclear Data Sheets","volume":"9 1","pages":"IBC"},"PeriodicalIF":3.7,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144900046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-01DOI: 10.1016/S0090-3752(25)00052-3
{"title":"Nuclear Data Sheets Symbols and Abbreviations","authors":"","doi":"10.1016/S0090-3752(25)00052-3","DOIUrl":"10.1016/S0090-3752(25)00052-3","url":null,"abstract":"","PeriodicalId":49735,"journal":{"name":"Nuclear Data Sheets","volume":"203 ","pages":"Page IBC"},"PeriodicalIF":2.8,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-01DOI: 10.1016/j.nds.2025.06.001
S. Ota , E.A. McCutchan
Spectroscopic data for all nuclei with mass number A=47 have been evaluated and the corresponding level schemes from radioactive decay and reaction studies are presented. Highlights from this evaluation include first observation of gamma-ray transitions in 47Ar, a new high precision measurement of 47K β decay, and first observation of excited levels and gamma-ray transitions in 47Mn.
{"title":"Nuclear Data Sheets for A=47","authors":"S. Ota , E.A. McCutchan","doi":"10.1016/j.nds.2025.06.001","DOIUrl":"10.1016/j.nds.2025.06.001","url":null,"abstract":"<div><div>Spectroscopic data for all nuclei with mass number A=47 have been evaluated and the corresponding level schemes from radioactive decay and reaction studies are presented. Highlights from this evaluation include first observation of gamma-ray transitions in <sup>47</sup>Ar, a new high precision measurement of <sup>47</sup>K <em>β</em> decay, and first observation of excited levels and gamma-ray transitions in <sup>47</sup>Mn.</div></div>","PeriodicalId":49735,"journal":{"name":"Nuclear Data Sheets","volume":"203 ","pages":"Pages 1-282"},"PeriodicalIF":2.8,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-01DOI: 10.1016/j.nds.2025.06.002
Alexandru Negret , Balraj Singh
Experimental nuclear spectroscopic data are evaluated for 14 known nuclides of mass number A=86 (Ga, Ge, As, Se, Br, Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru). Detailed evaluated information is presented for each reaction and decay. Recommended values combining all available data are provided for the spectroscopic properties of each level, γ-ray, and decay radiation. Limited level and gamma information is available for 86Ga (ground state and one excited level), 86Ge (six levels), and 86As (ten excited states), with their respective decays poorly known. Fairly detailed level and gamma data are available for 86Se, 86Br, 86Kr, 86Rb, 86Sr and 86Y nuclei. The decay of 86Br to 86Kr has recently been studied by gamma spectroscopy (2016Ur04) and by TAGS technique (2017Ri08), the latter suggesting that many additional levels in 86Kr exist which have not been detected in high-resolution γ-ray spectroscopy. The γ-ray spectra in 2016Ur04 were valid up to , whereas the Q(β) value of 7.63 MeV for 86Br permits population of high-energy levels. For 86Zr, 86Nb and 86Mo, the data are available for mostly the high-spin states, as the decays of 86Nb, 86Mo, and 86Tc, which could populate low-spin levels, are not known well. For 86Tc, only four levels are known from the decay of an isomeric activity in 86Tc. In addition, decay of 86Tc with g.s. to 0+ g.s. in 86Mo could involve superallowed β transition, which has been pursued experimentally in detail. For 86Ru only the isotopic identification is established, with its half-life and decay modes unknown. The evaluated data in this work supersede data in earlier ENSDF evaluation of A=86 nuclei by 2015Ne01, where the literature cutoff date was November 30, 2014.
{"title":"Nuclear Structure and Decay Data for A=86 Isobars","authors":"Alexandru Negret , Balraj Singh","doi":"10.1016/j.nds.2025.06.002","DOIUrl":"10.1016/j.nds.2025.06.002","url":null,"abstract":"<div><div>Experimental nuclear spectroscopic data are evaluated for 14 known nuclides of mass number A=86 (Ga, Ge, As, Se, Br, Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru). Detailed evaluated information is presented for each reaction and decay. Recommended values combining all available data are provided for the spectroscopic properties of each level, <em>γ</em>-ray, and decay radiation. Limited level and gamma information is available for <sup>86</sup>Ga (ground state and one excited level), <sup>86</sup>Ge (six levels), and <sup>86</sup>As (ten excited states), with their respective <span><math><msup><mrow><mi>β</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span> decays poorly known. Fairly detailed level and gamma data are available for <sup>86</sup>Se, <sup>86</sup>Br, <sup>86</sup>Kr, <sup>86</sup>Rb, <sup>86</sup>Sr and <sup>86</sup>Y nuclei. The decay of <sup>86</sup>Br to <sup>86</sup>Kr has recently been studied by gamma spectroscopy (2016Ur04) and by TAGS technique (2017Ri08), the latter suggesting that many additional levels in <sup>86</sup>Kr exist which have not been detected in high-resolution <em>γ</em>-ray spectroscopy. The <em>γ</em>-ray spectra in 2016Ur04 were valid up to <span><math><mi>E</mi><mi>γ</mi><mo>=</mo><mn>4</mn><mspace></mspace><mtext>MeV</mtext></math></span>, whereas the Q(<em>β</em>) value of 7.63 MeV for <sup>86</sup>Br permits population of high-energy levels. For <sup>86</sup>Zr, <sup>86</sup>Nb and <sup>86</sup>Mo, the data are available for mostly the high-spin states, as the decays of <sup>86</sup>Nb, <sup>86</sup>Mo, and <sup>86</sup>Tc, which could populate low-spin levels, are not known well. For <sup>86</sup>Tc, only four levels are known from the decay of an isomeric activity in <sup>86</sup>Tc. In addition, decay of <sup>86</sup>Tc with g.s. <span><math><msup><mrow><mtext>J</mtext></mrow><mrow><mi>π</mi></mrow></msup><mo>=</mo><mo>(</mo><msup><mrow><mn>0</mn></mrow><mrow><mo>+</mo></mrow></msup><mo>)</mo></math></span> to 0<sup>+</sup> g.s. in <sup>86</sup>Mo could involve superallowed <em>β</em> transition, which has been pursued experimentally in detail. For <sup>86</sup>Ru only the isotopic identification is established, with its half-life and decay modes unknown. The evaluated data in this work supersede data in earlier ENSDF evaluation of A=86 nuclei by 2015Ne01, where the literature cutoff date was November 30, 2014.</div></div>","PeriodicalId":49735,"journal":{"name":"Nuclear Data Sheets","volume":"203 ","pages":"Pages 283-646"},"PeriodicalIF":2.8,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-05-13DOI: 10.1016/S0090-3752(25)00042-0
{"title":"Nuclear Data Sheets Symbols and Abbreviations","authors":"","doi":"10.1016/S0090-3752(25)00042-0","DOIUrl":"10.1016/S0090-3752(25)00042-0","url":null,"abstract":"","PeriodicalId":49735,"journal":{"name":"Nuclear Data Sheets","volume":"202 ","pages":"Page IBC"},"PeriodicalIF":2.8,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The lack of completeness and systematic studies of cumulative fission product yield (FPY) from the three major actinides of 235U, 238U, and 239Pu, over a broad energy range, was the primary motivation for the LLNL-LANL-TUNL collaboration. Given the focus on resolving FPY behavior around fission spectrum neutron energies, our 2016 data provides FPY measurements in fine energy steps in the range of 0.5–5.5 MeV and an additional anchor point at 14.8 MeV. Recently, our collaboration filled the gap between second chance fission and 14.8 MeV, providing a comprehensive study at eleven incident neutron energies from 0.5 to 14.8 MeV. However, during the course of the last measurements, it was found that the reported masses of the actinide deposits in the fission ionization chambers, which were used to measure the number of fissions, were not consistent with the complementary tests. Therefore, some corrections to the old data are needed. The purpose of this paper is to summarize all of the high-yield FPY data obtained for 235U, 238U, and 239Pu isotopes using quasi-monoenergetic neutron beams at 11 incident energies ranging from to 14.8 MeV.
{"title":"Energy dependence of chain fission product yields from neutron-induced fission of 235U, 238U, and 239Pu","authors":"A.P. Tonchev , J.A. Silano , A.P.D. Ramirez , R.C. Malone , M.A. Stoyer , M.E. Gooden , T.A. Bredeweg , D.J. Vieira , J.B. Wilhelmy , S.W. Finch , C.R. Howell , W. Tornow","doi":"10.1016/j.nds.2025.04.002","DOIUrl":"10.1016/j.nds.2025.04.002","url":null,"abstract":"<div><div>The lack of completeness and systematic studies of cumulative fission product yield (FPY) from the three major actinides of <sup>235</sup>U, <sup>238</sup>U, and <sup>239</sup>Pu, over a broad energy range, was the primary motivation for the LLNL-LANL-TUNL collaboration. Given the focus on resolving FPY behavior around fission spectrum neutron energies, our 2016 data provides FPY measurements in fine energy steps in the range of 0.5–5.5 MeV and an additional anchor point at 14.8 MeV. Recently, our collaboration filled the gap between second chance fission and 14.8 MeV, providing a comprehensive study at eleven incident neutron energies from 0.5 to 14.8 MeV. However, during the course of the last measurements, it was found that the reported masses of the actinide deposits in the fission ionization chambers, which were used to measure the number of fissions, were not consistent with the complementary tests. Therefore, some corrections to the old data are needed. The purpose of this paper is to summarize all of the high-yield FPY data obtained for <sup>235</sup>U, <sup>238</sup>U, and <sup>239</sup>Pu isotopes using quasi-monoenergetic neutron beams at 11 incident energies ranging from <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>n</mi></mrow></msub><mo>=</mo><mn>0.5</mn></math></span> to 14.8 MeV.</div></div>","PeriodicalId":49735,"journal":{"name":"Nuclear Data Sheets","volume":"202 ","pages":"Pages 12-29"},"PeriodicalIF":2.8,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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