Pub Date : 2024-08-05DOI: 10.1103/physrevc.110.024301
H. Wang (王豪), K. Y. Ma (马克岩), D. Zhao (赵迪), J. Y. Li (李纪元), H. Y. Ye (叶欢仪), X. J. Zhao (赵新洁), J. X. Teng (滕佳欣), Z. Qiao (乔政), Y. C. Hao (郝宜春), Z. H. Zhao (赵子豪), H. C. Zhang (张会成), Y. K. Pan (潘禹坤), Y. J. Ma (马英君), J. B. Lu (陆景彬), Y. Zheng (郑云), C. B. Li (李聪博), T. X. Li (李天晓), X. G. Wu (吴晓光), H. Y. Wu (吴鸿毅), J. Z. Li (李金泽), R. Hong (洪锐), Z. Y. He (贺子阳), M. Zheng (郑敏), Y. Q. Li (李韵秋)
High-spin states of have been studied using the fusion-evaporation reaction at a beam energy of 32 MeV. The previously reported level scheme of is extended and modified with the addition of nearly 30 new transitions. A pair of nearly degenerate positive-parity doublet bands are identified and assigned the same configuration. The properties of both bands show general agreement with the fingerprints of chiral rotation, and thus the bands are suggested as candidate chiral doublet bands. This interpretation is also supported by the particle rotor model calculations. In addition, the high- intruder band is extended to the state. A new decoupled sequence and a weak positive-parity band with magnetic dipole transitions are observed. The former is tentatively assigned the configuration. Meanwhile, the systematic studies of the ,
{"title":"High-spin states and possible chirality in the odd−ACs133 nucleus","authors":"H. Wang (王豪), K. Y. Ma (马克岩), D. Zhao (赵迪), J. Y. Li (李纪元), H. Y. Ye (叶欢仪), X. J. Zhao (赵新洁), J. X. Teng (滕佳欣), Z. Qiao (乔政), Y. C. Hao (郝宜春), Z. H. Zhao (赵子豪), H. C. Zhang (张会成), Y. K. Pan (潘禹坤), Y. J. Ma (马英君), J. B. Lu (陆景彬), Y. Zheng (郑云), C. B. Li (李聪博), T. X. Li (李天晓), X. G. Wu (吴晓光), H. Y. Wu (吴鸿毅), J. Z. Li (李金泽), R. Hong (洪锐), Z. Y. He (贺子阳), M. Zheng (郑敏), Y. Q. Li (李韵秋)","doi":"10.1103/physrevc.110.024301","DOIUrl":"https://doi.org/10.1103/physrevc.110.024301","url":null,"abstract":"High-spin states of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Cs</mi><mprescripts></mprescripts><none></none><mn>133</mn></mmultiscripts></math> have been studied using the fusion-evaporation reaction <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mmultiscripts><mi>Te</mi><mprescripts></mprescripts><none></none><mn>130</mn></mmultiscripts><mo>(</mo><mmultiscripts><mi>Li</mi><mprescripts></mprescripts><none></none><mn>7</mn></mmultiscripts><mo>,</mo><mspace width=\"0.16em\"></mspace><mn>4</mn><mi>n</mi><mo>)</mo><mmultiscripts><mi>Cs</mi><mprescripts></mprescripts><none></none><mn>133</mn></mmultiscripts></mrow></math> at a beam energy of 32 MeV. The previously reported level scheme of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Cs</mi><mprescripts></mprescripts><none></none><mn>133</mn></mmultiscripts></math> is extended and modified with the addition of nearly 30 new <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>γ</mi></math> transitions. A pair of nearly degenerate positive-parity doublet bands are identified and assigned the same <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>π</mi><msub><mi>d</mi><mrow><mn>5</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>⊗</mo><mi>ν</mi><msubsup><mi>h</mi><mrow><mn>11</mn><mo>/</mo><mn>2</mn></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msubsup></mrow></math> configuration. The properties of both bands show general agreement with the fingerprints of chiral rotation, and thus the bands are suggested as candidate chiral doublet bands. This interpretation is also supported by the particle rotor model calculations. In addition, the high-<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>j</mi></math> intruder <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>π</mi><msub><mi>h</mi><mrow><mn>11</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow></math> band is extended to the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mn>27</mn><mo>/</mo><msup><mn>2</mn><mo>−</mo></msup></mrow></math> state. A new decoupled <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi mathvariant=\"normal\">Δ</mi><mi>I</mi><mo>=</mo><mn>2</mn></mrow></math> sequence and a weak positive-parity band with magnetic dipole <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo>(</mo><mi>M</mi><mn>1</mn><mo>)</mo></mrow></math> transitions are observed. The former is tentatively assigned the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>π</mi><msub><mi>d</mi><mrow><mn>5</mn><mo>/</mo><mn>2</mn></mrow></msub><msubsup><mi>h</mi><mrow><mn>11</mn><mo>/</mo><mn>2</mn></mrow><mn>2</mn></msubsup></mrow></math> configuration. Meanwhile, the systematic studies of the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>π</mi><msub><mi>d</mi><mrow><mn>5</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow></math>, <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>π</mi><msub><mi>g</mi><mrow><mn>7</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow></ma","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-08-05DOI: 10.1103/physrevc.110.025203
K. Okuyamaet al.(JLab Hypernuclear Collaboration)
In 2018, the E12-17-003 experiment was conducted at the Thomas Jefferson National Accelerator Facility (JLab) to explore the possible existence of an state in the reconstructed missing mass distribution from a tritium gas target [K. N. Suzuki et al., Prog. Theor. Exp. Phys.2022, 013D01 (2022); B. Pandey et al., Phys. Rev. C105, L051001 (2022)]. As part of this investigation, data were also collected using a gaseous hydrogen target, not only for a precise absolute mass scale calibration but also for the study of electroproduction. This dataset was acquired at , GeV, and . It covers forward angles where photoproduction data are scarce and a low- region that is of interest for hypernuclear experiments. On the other hand, this kinematic region is at a slightly higher than previous hypernuclear experiments, thus providing crucial information for understanding the dependence of the differential cross sections for hyperon electroproduction. This paper reports on the dependence of the differential cross section for the reaction at
{"title":"Electroproduction of the Λ/Σ0 hyperons at Q2≃0.5 (GeV/c)2 at forward angles","authors":"K. Okuyamaet al.(JLab Hypernuclear Collaboration)","doi":"10.1103/physrevc.110.025203","DOIUrl":"https://doi.org/10.1103/physrevc.110.025203","url":null,"abstract":"In 2018, the E12-17-003 experiment was conducted at the Thomas Jefferson National Accelerator Facility (JLab) to explore the possible existence of an <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>n</mi><mi>n</mi><mi mathvariant=\"normal\">Λ</mi></mrow></math> state in the reconstructed missing mass distribution from a tritium gas target [K. N. Suzuki <i>et al.</i>, <span>Prog. Theor. Exp. Phys.</span> <b>2022</b>, 013D01 (2022); B. Pandey <i>et al.</i>, <span>Phys. Rev. C</span> <b>105</b>, L051001 (2022)]. As part of this investigation, data were also collected using a gaseous hydrogen target, not only for a precise absolute mass scale calibration but also for the study of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi mathvariant=\"normal\">Λ</mi><mo>/</mo><msup><mi mathvariant=\"normal\">Σ</mi><mn>0</mn></msup></mrow></math> electroproduction. This dataset was acquired at <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msup><mi>Q</mi><mn>2</mn></msup><mo>≃</mo><mn>0.5</mn></mrow></math> <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mrow><mo>(</mo><mi>GeV</mi><mo>/</mo><mi>c</mi><mo>)</mo></mrow><mn>2</mn></msup></math>, <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>W</mi><mo>=</mo><mn>2.14</mn></mrow></math> GeV, and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msubsup><mi>θ</mi><mrow><mi>γ</mi><mi mathvariant=\"normal\">K</mi></mrow><mrow><mi mathvariant=\"normal\">c</mi><mo>.</mo><mi mathvariant=\"normal\">m</mi><mo>.</mo></mrow></msubsup><mo>≃</mo><msup><mn>8</mn><mo>∘</mo></msup></mrow></math>. It covers forward angles where photoproduction data are scarce and a low-<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>Q</mi><mn>2</mn></msup></math> region that is of interest for hypernuclear experiments. On the other hand, this kinematic region is at a slightly higher <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>Q</mi><mn>2</mn></msup></math> than previous hypernuclear experiments, thus providing crucial information for understanding the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>Q</mi><mn>2</mn></msup></math> dependence of the differential cross sections for <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi mathvariant=\"normal\">Λ</mi><mo>/</mo><msup><mi mathvariant=\"normal\">Σ</mi><mn>0</mn></msup></mrow></math> hyperon electroproduction. This paper reports on the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>Q</mi><mn>2</mn></msup></math> dependence of the differential cross section for the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>e</mi><mo>+</mo><mi>p</mi><mo>→</mo><msup><mi>e</mi><mo>′</mo></msup><mo>+</mo><msup><mi>K</mi><mo>+</mo></msup><mo>+</mo><mi mathvariant=\"normal\">Λ</mi><mo>/</mo><msup><mi mathvariant=\"normal\">Σ</mi><mn>0</mn></msup></mrow></math> reaction at <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mn>0.2</mn><mo>–</mo><mn>0.8</mn></mrow></math> <math xmlns=\"http://www.w3.org/1998/Ma","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Background: Nuclear deformation provides a crucial characteristic of nuclear structure. Conventionally, the quadrupole deformation length of a nucleus, , has often been determined based on a macroscopic model through a deformed nuclear potential with the deformation length , which is determined to reproduce the nuclear scattering data. This approach assumes although there is no theoretical foundation.
{"title":"Investigation of the determination of nuclear deformation using high-energy heavy-ion scattering","authors":"Shin Watanabe, Takenori Furumoto, Wataru Horiuchi, Tadahiro Suhara, Yasutaka Taniguchi","doi":"10.1103/physrevc.110.024604","DOIUrl":"https://doi.org/10.1103/physrevc.110.024604","url":null,"abstract":"<b>Background:</b> Nuclear deformation provides a crucial characteristic of nuclear structure. Conventionally, the quadrupole deformation length of a nucleus, <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>δ</mi><mn>2</mn></msub></math>, has often been determined based on a macroscopic model through a deformed nuclear potential with the deformation length <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msubsup><mi>δ</mi><mn>2</mn><mrow><mo>(</mo><mi>pot</mi><mo>)</mo></mrow></msubsup></math>, which is determined to reproduce the nuclear scattering data. This approach assumes <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>δ</mi><mn>2</mn></msub><mo>=</mo><msubsup><mi>δ</mi><mn>2</mn><mrow><mo>(</mo><mi>pot</mi><mo>)</mo></mrow></msubsup></mrow></math> although there is no theoretical foundation.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-08-05DOI: 10.1103/physrevc.110.024902
Ankit Kumar Panda, Partha Bagchi, Hiranmaya Mishra, Victor Roy
We investigate the impact of baryon stopping on the temporal evolution of electromagnetic fields in vacuum at low-energy Au+Au collisions with . Baryon stopping is incorporated into the Monte Carlo Glauber model by employing a parametrized velocity profile of participant nucleons with nonzero deceleration. The presence of these decelerating participants leads to noticeable changes in the centrality and dependence of electromagnetic fields compared to scenarios with vanishing deceleration. The influence of baryon stopping differs for electric and magnetic fields, also exhibiting variations across their components. We observe slight alteration in the approximate linear dependency of field strengths with in the presence of deceleration. Additionally, the longitudinal component of the electric field at late times becomes significant in the presence of baryon stopping.
{"title":"Electromagnetic fields in low-energy heavy-ion collisions with baryon stopping","authors":"Ankit Kumar Panda, Partha Bagchi, Hiranmaya Mishra, Victor Roy","doi":"10.1103/physrevc.110.024902","DOIUrl":"https://doi.org/10.1103/physrevc.110.024902","url":null,"abstract":"We investigate the impact of baryon stopping on the temporal evolution of electromagnetic fields in vacuum at low-energy Au+Au collisions with <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt><mo>=</mo><mn>4</mn><mo>–</mo><mn>20</mn><mspace width=\"0.16em\"></mspace><mi>GeV</mi></mrow></math>. Baryon stopping is incorporated into the Monte Carlo Glauber model by employing a parametrized velocity profile of participant nucleons with nonzero deceleration. The presence of these decelerating participants leads to noticeable changes in the centrality and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt></math> dependence of electromagnetic fields compared to scenarios with vanishing deceleration. The influence of baryon stopping differs for electric and magnetic fields, also exhibiting variations across their components. We observe slight alteration in the approximate linear dependency of field strengths with <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt></math> in the presence of deceleration. Additionally, the longitudinal component of the electric field at late times becomes significant in the presence of baryon stopping.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-08-05DOI: 10.1103/physrevc.110.024001
S. A. Rakityansky
A simple analytic expression of the three-body wave function describing the system in the ground state of is obtained. In doing this, it is assumed that the particles interact with each other via the -wave Ali-Bodmer potential including the Coulomb term, and the neutron- forces act only in the -wave state. This wave function is constructed by trial and error method via solving in this way a kind of inverse problem when the two-body potential is recovered from a postulated three-body wave function. As a result, the wave function is an exact solution of the corresponding three-body Schrödinger equation for experimentally known binding energy and for the potential whose difference from the Ali-Bodmer one is minimized by varying the adjustable parameters on which the postulated wave function depends.
我们得到了描述 Be9 基态 32- 系统 (ααn) 的三体波函数的简单解析表达式。在此过程中，假定 α 粒子通过包括库仑项在内的 S 波阿里-博德默势相互作用，而中子-α 力只作用于 P 波状态。这种波函数是通过试错法构建的，即从假定的三体波函数恢复二体 αα 势时，通过这种方法求解一种逆问题。因此，对于实验已知的结合能和αα势，波函数是相应的三体薛定谔方程的精确解，通过改变假定波函数所依赖的可调参数，可使其与αα势的差值最小化。
{"title":"Wave function of Be9 in the three-body (ααn) model","authors":"S. A. Rakityansky","doi":"10.1103/physrevc.110.024001","DOIUrl":"https://doi.org/10.1103/physrevc.110.024001","url":null,"abstract":"A simple analytic expression of the three-body wave function describing the system <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo>(</mo><mi>α</mi><mi>α</mi><mi>n</mi><mo>)</mo></mrow></math> in the ground state <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mfrac><mn>3</mn><mn>2</mn></mfrac><mo>−</mo></msup></math> of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Be</mi><mprescripts></mprescripts><none></none><mn>9</mn></mmultiscripts></math> is obtained. In doing this, it is assumed that the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>α</mi></math> particles interact with each other via the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi></math>-wave Ali-Bodmer potential including the Coulomb term, and the neutron-<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>α</mi></math> forces act only in the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>P</mi></math>-wave state. This wave function is constructed by trial and error method via solving in this way a kind of inverse problem when the two-body <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>α</mi><mi>α</mi></mrow></math> potential is recovered from a postulated three-body wave function. As a result, the wave function is an exact solution of the corresponding three-body Schrödinger equation for experimentally known binding energy and for the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>α</mi><mi>α</mi></mrow></math> potential whose difference from the Ali-Bodmer one is minimized by varying the adjustable parameters on which the postulated wave function depends.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-08-05DOI: 10.1103/physrevc.110.025201
Volker Koch, Larry McLerran, Gerald A. Miller, Volodymyr Vovchenko
The possibility that nuclear matter might be quarkyonic is considered. Quarkyonic matter is high baryon density matter that is confined but can be approximately thought of as a filled Fermi sea of quarks surrounded by a shell of nucleons. Here, nuclear matter is described by the IdylliQ sigma model for quarkyonic matter, generalizing the noninteracting IdylliQ model [Y. Fujimoto et al., Phys. Rev. Lett.132, 112701 (2024)] to include interactions with a meson and a pion. When such interactions are included, we find that isospin-symmetric nuclear matter binds with acceptable values of the compressibility and other parameters for nuclear matter at saturation. The energy per nucleon and sound velocity of such matter is computed, and the isospin dependence is determined. Nuclear matter is formed at a density close to but slightly above the density at which quarkyonic matter forms. Quarkyonic matter predicts a strong depletion of nucleons in normal nuclear matter at low momentum. Such a depletion for nucleon momenta MeV is shown to be consistent with electron scattering data.
{"title":"Examining the possibility that normal nuclear matter is quarkyonic","authors":"Volker Koch, Larry McLerran, Gerald A. Miller, Volodymyr Vovchenko","doi":"10.1103/physrevc.110.025201","DOIUrl":"https://doi.org/10.1103/physrevc.110.025201","url":null,"abstract":"The possibility that nuclear matter might be quarkyonic is considered. Quarkyonic matter is high baryon density matter that is confined but can be approximately thought of as a filled Fermi sea of quarks surrounded by a shell of nucleons. Here, nuclear matter is described by the IdylliQ sigma model for quarkyonic matter, generalizing the noninteracting IdylliQ model [Y. Fujimoto <i>et al.</i>, <span>Phys. Rev. Lett.</span> <b>132</b>, 112701 (2024)] to include interactions with a <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>σ</mi></math> meson and a pion. When such interactions are included, we find that isospin-symmetric nuclear matter binds with acceptable values of the compressibility and other parameters for nuclear matter at saturation. The energy per nucleon and sound velocity of such matter is computed, and the isospin dependence is determined. Nuclear matter is formed at a density close to but slightly above the density at which quarkyonic matter forms. Quarkyonic matter predicts a strong depletion of nucleons in normal nuclear matter at low momentum. Such a depletion for nucleon momenta <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>k</mi><mo>≲</mo><mn>120</mn></mrow></math> MeV is shown to be consistent with electron scattering data.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-08-05DOI: 10.1103/physrevc.110.024603
R. Gharaei, Kh. Haghighi Pour, N. Ghal-Eh
The influence of different nuclear surface energy coefficients on the process of proton radioactivity is systematically studied within the Coulomb and proximity potential formalism. We investigate the proximity potential Guo 2013 formalism with 13 different versions of the coefficient for the description of 44 experimental half-lives of proton emitters in the ground and isomeric states. It has been observed that the four versions, namely Guo 2013 (original), Guo 2013 (set 1), Guo 2013 (set 2), and Guo 2013 (set 3), exhibit the lowest rms deviations (approximately ) when compared to the experimental data. The detailed investigation of the known proton decay processes indicate that the decrease in the strength of nuclear surface tension improves the agreement between the experimental data and the calculated values of proton radioactivity half-lives. In addition, our results reveal that the apparent deviation does not follow a continuous behavior around . In fact, by decreasing the strength of the surface energy coefficient compared to its calculated value from the original proximity potential (Guo 2013) for lighter mass regions and increasing it for heavier ones , we observe significantly improved agreement with experimental data . A discussion about the role of nuclear surface tension coefficients in the experimental information of proton emitters in the ground state and the isomeric state is also presented.
{"title":"Investigating the impact of nuclear surface energy coefficients on one-proton radioactivity","authors":"R. Gharaei, Kh. Haghighi Pour, N. Ghal-Eh","doi":"10.1103/physrevc.110.024603","DOIUrl":"https://doi.org/10.1103/physrevc.110.024603","url":null,"abstract":"The influence of different nuclear surface energy coefficients <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>γ</mi></math> on the process of proton radioactivity is systematically studied within the Coulomb and proximity potential formalism. We investigate the proximity potential Guo 2013 formalism with 13 different versions of the coefficient <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>γ</mi></math> for the description of 44 experimental half-lives of proton emitters in the ground and isomeric states. It has been observed that the four versions, namely Guo 2013 (original), Guo 2013 (set 1), Guo 2013 (set 2), and Guo 2013 (set 3), exhibit the lowest rms deviations (approximately <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>σ</mi><mo>=</mo><mn>0.4733</mn></mrow></math>) when compared to the experimental data. The detailed investigation of the known proton decay processes indicate that the decrease in the strength of nuclear surface tension improves the agreement between the experimental data and the calculated values of proton radioactivity half-lives. In addition, our results reveal that the apparent deviation does not follow a continuous behavior around <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>Z</mi><mo>=</mo><mn>68</mn></mrow></math>. In fact, by decreasing the strength of the surface energy coefficient <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>γ</mi></math> compared to its calculated value from the original proximity potential (Guo 2013) for lighter mass regions <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo>(</mo><mi>Z</mi><mo><</mo><mn>68</mn><mo>)</mo></mrow></math> and increasing it for heavier ones <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo>(</mo><mi>Z</mi><mo>></mo><mn>68</mn><mo>)</mo></mrow></math>, we observe significantly improved agreement with experimental data <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo>(</mo><mi>σ</mi><mo>=</mo><mn>0.453</mn><mo>)</mo></mrow></math>. A discussion about the role of nuclear surface tension coefficients in the experimental information of proton emitters in the ground state and the isomeric state is also presented.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-08-05DOI: 10.1103/physrevc.110.025202
S. Moran, M. Arratia, J. Arrington, D. Gaskell, B. Schmookler
Deep inelastic scattering from nuclear targets probes the parton distribution functions (PDFs) in nuclei. Comparisons of the PDFs from heavy nuclei and the deuteron show deviations that demonstrate a nontrivial nuclear dependence to these distributions, referred to as the EMC effect. A global analysis of the world's data on the EMC effect reveals tensions between different extractions. Precise measurements at Jefferson Lab, studying the dependence on both the quark momentum fraction, , and nuclear mass, show systematic discrepancies among experiments, making the extraction of the A dependence of the EMC effect sensitive to the selection of datasets. By comparing various methods and assumptions used to calculate radiative corrections, we have identified differences that, while not large, significantly impact the EMC ratios and show that using a consistent radiative correction procedure resolves this discrepancy, leading to a more coherent global picture and allowing for a more robust extraction of the EMC effect for infinite nuclear matter.
来自核目标的深度非弹性散射探测了原子核中的粒子分布函数（PDF）。对重核和氘核的 PDFs 进行比较后发现，这些分布存在偏差，表明这些分布与核无关，被称为 EMC 效应。对世界上有关 EMC 效应的数据进行的全球分析表明，不同的提取方法之间存在着紧张关系。杰斐逊实验室的精确测量研究了夸克动量分数 x 和核质量的依赖性，结果显示不同实验之间存在系统性差异，这使得提取 EMC 效应的 A 依赖性对数据集的选择非常敏感。通过比较用于计算辐射修正的各种方法和假设，我们发现了一些差异，这些差异虽然不大，但对 EMC 比值有显著影响，并表明使用一致的辐射修正程序可以解决这种差异，从而获得更一致的全局图景，并允许对无限核物质的 EMC 效应进行更稳健的提取。
{"title":"Significance of radiative corrections on measurements of the EMC effect","authors":"S. Moran, M. Arratia, J. Arrington, D. Gaskell, B. Schmookler","doi":"10.1103/physrevc.110.025202","DOIUrl":"https://doi.org/10.1103/physrevc.110.025202","url":null,"abstract":"Deep inelastic scattering from nuclear targets probes the parton distribution functions (PDFs) in nuclei. Comparisons of the PDFs from heavy nuclei and the deuteron show deviations that demonstrate a nontrivial nuclear dependence to these distributions, referred to as the EMC effect. A global analysis of the world's data on the EMC effect reveals tensions between different extractions. Precise measurements at Jefferson Lab, studying the dependence on both the quark momentum fraction, <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>x</mi></math>, and nuclear mass, show systematic discrepancies among experiments, making the extraction of the A dependence of the EMC effect sensitive to the selection of datasets. By comparing various methods and assumptions used to calculate radiative corrections, we have identified differences that, while not large, significantly impact the EMC ratios and show that using a consistent radiative correction procedure resolves this discrepancy, leading to a more coherent global picture and allowing for a more robust extraction of the EMC effect for infinite nuclear matter.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-08-01DOI: 10.1103/physrevc.110.024601
Shilpa Rana, M. Bhuyan, Raj Kumar, B. V. Carlson
Nuclear shape and orientation degrees of freedom are incorporated into the calculation of the double-folding nuclear potential within the relativistic mean-field (RMF) formalism. The quadrupole deformations (), nuclear densities, and the effective nucleon-nucleon () interaction potential are obtained using the RMF approach for the hybrid, , and NL3 parametrizations. The calculated quadrupole deformations are included in the target densities through the nuclear radius. The deformation and orientation-dependent microscopic nuclear potentials are further employed to obtain fusion barrier characteristics and cross sections for 12 even-even heavy-ion reactions with doubly magic spherical and as projectiles along with deformed targets from different mass regions. The results obtained for the relativistic R3Y potential are compared with those of the Reid version of the nonrelativistic M3Y potential as well as with the available experimental data. A decrease in the barrier height and increase in the cross-section is observed upon the inclusion of target quadrupole deformations in the nuclear density distributions at the target orientation angles, for the R3Y potential and at for the M3Y potential. On comparing the -integrated cross section calculated using M3Y and R3Y potentials with spherical and deformed densities, one observes that the deformed densities and the relativistic R3Y potential obtained for the hybrid parameter set provide better agreement with
核形状和取向自由度被纳入相对论均场（RMF）形式主义的双折叠核势计算中。使用混合、NL3* 和 NL3 参数化的 RMF 方法获得了四极子变形（β2）、核密度和有效核子-核子（NN）相互作用势。通过核半径，计算出的四极子变形被包含在目标密度中。利用变形和取向相关的微观核势，进一步获得了以双魔球 O16 和 Ca48 为射弹的 12 个偶偶重离子反应的聚变势垒特性和截面，以及来自不同质量区域的变形靶。相对论 R3Y NN 势的结果与 Reid 版本的非相对论 M3Y NN 势的结果以及现有实验数据进行了比较。当在 R3Y NN 势的θ2≤58∘处和 M3Y NN 势的θ2≤60∘处的核密度分布中加入靶四极变形时，可以观察到势垒高度降低和截面增大。比较使用 M3Y 和 R3Y NN 势计算出的θ2-积分截面，以及球形密度和变形密度，可以发现混合参数集得到的变形密度和相对论 R3Y NN 势与所有考虑反应的现有实验数据更为吻合。此外，在形成较重化合物核的反应中，核形状自由度和取向的加入对聚变势垒特征的改变以及由此对截面的改变变得更加突出。这意味着在 RMF 形式中计算微观核势时纳入核变形和取向对于可靠描述亚屏障核聚变动力学至关重要，特别是在重质量和超重质量区域。
{"title":"Effect of nuclear deformation and orientation about the symmetry axis of the target nucleus on heavy-ion fusion dynamics","authors":"Shilpa Rana, M. Bhuyan, Raj Kumar, B. V. Carlson","doi":"10.1103/physrevc.110.024601","DOIUrl":"https://doi.org/10.1103/physrevc.110.024601","url":null,"abstract":"Nuclear shape and orientation degrees of freedom are incorporated into the calculation of the double-folding nuclear potential within the relativistic mean-field (RMF) formalism. The quadrupole deformations (<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>β</mi><mn>2</mn></msub></math>), nuclear densities, and the effective nucleon-nucleon (<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>N</mi><mi>N</mi></mrow></math>) interaction potential are obtained using the RMF approach for the hybrid, <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mrow><mi>NL3</mi></mrow><mo>*</mo></msup></math>, and NL3 parametrizations. The calculated quadrupole deformations are included in the target densities through the nuclear radius. The deformation and orientation-dependent microscopic nuclear potentials are further employed to obtain fusion barrier characteristics and cross sections for 12 even-even heavy-ion reactions with doubly magic spherical <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi mathvariant=\"normal\">O</mi><mprescripts></mprescripts><none></none><mn>16</mn></mmultiscripts></math> and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Ca</mi><mprescripts></mprescripts><none></none><mn>48</mn></mmultiscripts></math> as projectiles along with deformed targets from different mass regions. The results obtained for the relativistic R3Y <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>N</mi><mi>N</mi></mrow></math> potential are compared with those of the Reid version of the nonrelativistic M3Y <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>N</mi><mi>N</mi></mrow></math> potential as well as with the available experimental data. A decrease in the barrier height and increase in the cross-section is observed upon the inclusion of target quadrupole deformations in the nuclear density distributions at the target orientation angles, <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>θ</mi><mn>2</mn></msub><mo>≤</mo><msup><mn>58</mn><mo>∘</mo></msup></mrow></math> for the R3Y <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>N</mi><mi>N</mi></mrow></math> potential and at <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>θ</mi><mn>2</mn></msub><mo>≤</mo><msup><mn>60</mn><mo>∘</mo></msup></mrow></math> for the M3Y <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>N</mi><mi>N</mi></mrow></math> potential. On comparing the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>θ</mi><mn>2</mn></msub></math>-integrated cross section calculated using M3Y and R3Y <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>N</mi><mi>N</mi></mrow></math> potentials with spherical and deformed densities, one observes that the deformed densities and the relativistic R3Y <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>N</mi><mi>N</mi></mrow></math> potential obtained for the hybrid parameter set provide better agreement with ","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-08-01DOI: 10.1103/physrevc.110.024602
A. Chalil, C. Ducoin, O. Stézowski, N. Millard-Pinard, J. Dudouet, Y. Demane, M. Chamseddine
The process nucleosynthesis is responsible for the synthesis of 35 neutron-deficient nuclei from to . An important input that can affect the modeling of this process is the nuclear level density at the relevant excitation energies of the nuclei involved in the reaction network. The oslo method has been extensively used for the measurement of level densities in excitation energies of several MeV. In this work, Bayesian optimization has been used in order to estimate the 95% credible intervals for the parameters of two level-density models optimized on the oslo data. These uncertainties are then propagated on the cross sections of () reactions leading to the compound nuclei and inside the astrophysically relevant energy range. Imposing constraints in this region of the isotopic chart is important for network calculations involving the nearby nuclei and . We discuss the reduction of the range of cross sections due to the uncertainties arising from the level-density data compared to the range of the six default level-density models available in talys and we highlight the need for level-density data inside the astrophysically relevant energy ranges.
{"title":"Bayesian uncertainty quantification on nuclear level-density data and their impact on (p,γ) reactions of astrophysical interest","authors":"A. Chalil, C. Ducoin, O. Stézowski, N. Millard-Pinard, J. Dudouet, Y. Demane, M. Chamseddine","doi":"10.1103/physrevc.110.024602","DOIUrl":"https://doi.org/10.1103/physrevc.110.024602","url":null,"abstract":"The <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>p</mi></math> process nucleosynthesis is responsible for the synthesis of 35 neutron-deficient nuclei from <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Se</mi><mprescripts></mprescripts><none></none><mn>35</mn></mmultiscripts></math> to <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Hg</mi><mprescripts></mprescripts><none></none><mn>196</mn></mmultiscripts></math>. An important input that can affect the modeling of this process is the nuclear level density at the relevant excitation energies of the nuclei involved in the reaction network. The <span>oslo</span> method has been extensively used for the measurement of level densities in excitation energies of several MeV. In this work, Bayesian optimization has been used in order to estimate the 95% credible intervals for the parameters of two level-density models optimized on the <span>oslo</span> data. These uncertainties are then propagated on the cross sections of (<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>p</mi><mo>,</mo><mi>γ</mi></mrow></math>) reactions leading to the compound nuclei <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Pd</mi><mprescripts></mprescripts><none></none><mrow><mn>105</mn><mo>,</mo><mn>106</mn></mrow></mmultiscripts></math> and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Cd</mi><mprescripts></mprescripts><none></none><mrow><mn>105</mn><mo>,</mo><mn>106</mn></mrow></mmultiscripts></math> inside the astrophysically relevant energy range. Imposing constraints in this region of the isotopic chart is important for network calculations involving the nearby <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>p</mi></math> nuclei <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Pd</mi><mprescripts></mprescripts><none></none><mn>102</mn></mmultiscripts></math> and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Cd</mi><mprescripts></mprescripts><none></none><mn>106</mn></mmultiscripts></math>. We discuss the reduction of the range of cross sections due to the uncertainties arising from the level-density data compared to the range of the six default level-density models available in <span>talys</span> and we highlight the need for level-density data inside the astrophysically relevant energy ranges.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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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