Physical Review C最新文献

{"title":"β-delayed neutron emission of Mn64, Cr62, and Fe65","authors":"W.-J. Ong, H. Schatz, K. Kravvaris, S. Ahn, K. Childers, B. P. Crider, A. C. Dombos, C. Langer, R. Lewis, S. N. Liddick, S. Lyons, Z. Meisel, F. Montes, J. Pereira, D. Richman, K. Schmidt, A. Spyrou","doi":"10.1103/physrevc.110.024321","DOIUrl":"https://doi.org/10.1103/physrevc.110.024321","url":null,"abstract":"The <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>β</mi></math>-decay properties of nuclei near the second nuclear “island of inversion” around neutron rich nuclei with neutron number 40 are important tests of nuclear structure models and interactions. In particular, the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>β</mi></math>-delayed neutron emission branch (<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>P</mi><mi mathvariant=\"normal\">n</mi></msub></math>), is useful for investigating <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>β</mi></math>-strength and neutron-<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>γ</mi></math> competition above the neutron separation energies of the daughter nuclei. We report new constraints for <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>P</mi><mi mathvariant=\"normal\">n</mi></msub></math> values for three nuclei in the region: <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Cr</mi><mprescripts></mprescripts><none></none><mn>62</mn></mmultiscripts></math> (<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>P</mi><mi mathvariant=\"normal\">n</mi></msub><mo><</mo><mn>1</mn><mo>%</mo></mrow></math>), <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Mn</mi><mprescripts></mprescripts><none></none><mn>64</mn></mmultiscripts></math> (<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>P</mi><mi mathvariant=\"normal\">n</mi></msub><mo>=</mo><mn>1.5</mn><mrow><mo>(</mo><mn>6</mn><mo>)</mo></mrow><mo>%</mo></mrow></math>), and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Fe</mi><mprescripts></mprescripts><none></none><mn>65</mn></mmultiscripts></math> (<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>P</mi><mi mathvariant=\"normal\">n</mi></msub><mo><</mo><mn>1</mn><mo>%</mo></mrow></math>), measured with the Neutron Emission Ratio Observer (NERO) neutron long counter system and the Beta Counting Station (BCS) at the National Superconducting Cyclotron Laboratory (NSCL). Our results resolve the large discrepancy between previous direct and indirect measurements for <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Mn</mi><mprescripts></mprescripts><none></none><mn>64</mn></mmultiscripts></math> and confirm the predictions of global theoretical models when a statistical treatment of the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>γ</mi></math> and neutron decays of the daughter states is included. We also obtain improved half-lives for <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Cr</mi><mprescripts></mprescripts><none></none><mn>62</mn></mmultiscripts></math> [206(5) ms] and the short-lived isomer in the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Fe</mi><mprescripts></mprescripts><none></none><mn>62</mn></mmultiscripts></math> daughter [112(7) ms] from <math xmlns=\"http://www.w3.org/1998/Math/","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"7 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187020","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}

{"title":"Photoproduction of γp→f0(980)p in an effective Lagrangian approach","authors":"Neng-Chang Wei, Ai-Chao Wang, Fei Huang","doi":"10.1103/physrevc.110.025207","DOIUrl":"https://doi.org/10.1103/physrevc.110.025207","url":null,"abstract":"The most recent data on differential cross sections and photon beam asymmetries <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi mathvariant=\"normal\">Σ</mi></math> from the LEPS2/BGOegg Collaboration for the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>γ</mi><mi>p</mi><mo>→</mo><msub><mi>f</mi><mn>0</mn></msub><mrow><mo>(</mo><mn>980</mn><mo>)</mo></mrow><mi>p</mi></mrow></math> reaction are analyzed within a tree-level effective Lagrangian approach. The <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>t</mi></math>-channel <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>ρ</mi></math> and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>ω</mi></math> exchanges, the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>u</mi></math>- and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>s</mi></math>-channel <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi></math> exchanges, the interaction current, and the possible <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>s</mi></math>-channel <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>N</mi><mo>*</mo></msup></math> exchanges are taken into account in constructing the reaction amplitudes to reproduce the data. The results show that the contributions from either the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>N</mi><mrow><mo>(</mo><mn>2040</mn><mo>)</mo></mrow><mn>3</mn><mo>/</mo><msup><mn>2</mn><mo>+</mo></msup></mrow></math> or the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>N</mi><mrow><mo>(</mo><mn>2100</mn><mo>)</mo></mrow><mn>1</mn><mo>/</mo><msup><mn>2</mn><mo>+</mo></msup></mrow></math> resonance exchange in the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>s</mi></math> channel are necessarily required to describe the LEPS2/BGOegg data and they dominate the differential cross sections of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>γ</mi><mi>p</mi><mo>→</mo><msub><mi>f</mi><mn>0</mn></msub><mrow><mo>(</mo><mn>980</mn><mo>)</mo></mrow><mi>p</mi></mrow></math>. Further analysis shows that the contributions from the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>t</mi></math>-channel <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>ρ</mi></math> and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>ω</mi></math> exchanges and the interaction current are rather small to both differential cross sections and photo beam asymmetries, and the contributions from <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>u</mi></math>-channel <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi></math> exchange are considerable in the case of including <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>N</mi><mrow><mo>(</mo><mn>2040</mn><mo>)</mo></mrow><mn>3</mn><mo>/</mo><msup><mn>2</mn><mo>+</mo></msup></mrow></math> in the model while negligible in the case of including <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>N</mi><mrow><mo>(</mo><mn>2100</mn><mo>)</mo","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"33 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187003","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}

{"title":"Static and dynamic effects of the low breakup threshold of Li6 in complete fusion reactions","authors":"S. R. Souza, L. F. Canto, R. Donangelo","doi":"10.1103/physrevc.110.024615","DOIUrl":"https://doi.org/10.1103/physrevc.110.024615","url":null,"abstract":"We study complete fusion (CF) reactions in collisions of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Li</mi><mprescripts></mprescripts><none></none><mn>6</mn></mmultiscripts></math> projectiles with <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Si</mi><mprescripts></mprescripts><none></none><mn>28</mn></mmultiscripts><mo>,</mo><mo> </mo><mmultiscripts><mi>Ni</mi><mprescripts></mprescripts><none></none><mn>64</mn></mmultiscripts></math>, and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Tb</mi><mprescripts></mprescripts><none></none><mn>159</mn></mmultiscripts></math> targets, from sub-barrier energies up to energies well above the Coulomb barrier. For this purpose, we use a recently developed theoretical method, based on continuum discretized coupled channel wave functions, which successfully predicted CF data for heavier systems. To perform the numerical calculations, we developed a computer code where the continuum discretized wave functions are evaluated by the pseudostates method. We investigate the sensitivity of the results to the largest energy used in the continuum discretization, including closed channels. We find that very good convergence is reached by including continuum states with energies up to 15 MeV. We show that the theoretical CF cross sections of the present study reproduce the available data for the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Si</mi><mprescripts></mprescripts><none></none><mn>28</mn></mmultiscripts><mo>,</mo><mo> </mo><mmultiscripts><mi>Ni</mi><mprescripts></mprescripts><none></none><mn>64</mn></mmultiscripts></math>, and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Tb</mi><mprescripts></mprescripts><none></none><mn>159</mn></mmultiscripts></math> targets fairly well. A detailed discussion of the static and dynamical effects of the low breakup threshold of the projectile on the CF cross section is presented, considering collisions with targets in different mass regions.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"48 8 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187001","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}

{"title":"Laser-enhanced fusion burn fractions for advanced fuels","authors":"John Jasper Bekx, Siegfried Heinz Glenzer, Karl-Georg Schlesinger","doi":"10.1103/physrevc.110.024612","DOIUrl":"https://doi.org/10.1103/physrevc.110.024612","url":null,"abstract":"Calculations for the burn fraction in a laser-created plasma are presented, taking fuel depletion into account. The enhancement from a strong-field laser is analyzed and calculated in the Floquet-Volkoff framework, which was verified to provide an adequate theoretical prediction for laser-enhanced fusion cross sections in a previous work [<span>Phys. Rev. C</span> <b>109</b>, 044605 (2024)]. Three different fuels were considered for the fusion process, namely deuterium-tritium (DT) fusion, deuterium-helium fusion, and proton-boron fusion. Their laser-enhanced burn fractions are compared in idealistic and realistic settings, where both thermal and nonthermal distributions are considered. It is found that DT fusion gains the least relative enhancement to the burn fraction in all scenarios considered, and that the remaining fuels do not gain an absolute enhancement large enough to be appreciable in comparison with the former.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"13 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187016","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}

{"title":"Comprehensive analysis of precompound emission: Role of shell closure and target deformation","authors":"Manoj Kumar Sharma, Mamta Saraswat, Satyendra Kumar Gautam, Sushant Arora, Gobind Ram, M. Shuaib, M. Shariq Asnain, Abhishek Yadav, Pushpendra P. Singh, B. P. Singh, R. Prasad","doi":"10.1103/physrevc.110.024613","DOIUrl":"https://doi.org/10.1103/physrevc.110.024613","url":null,"abstract":"The present work on low-energy reaction dynamics recognizes the importance of precompound emission as a paramount deexcitation process for emitting energetic particles, even at energies as low as <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo>≈</mo><mn>4</mn><mo>–</mo><mn>5</mn></mrow></math> MeV/nucleon, where the compound nucleus process has been identified as the sole contributor. This recognition is achieved by performing a comprehensive analysis of cross-section data for a large number of (<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>α</mi><mo>,</mo><mi>n</mi></mrow></math>) reactions within the framework of the theoretical model-based codes <span>cascade</span>, <span>pace4</span>, and <span>talys</span> at varying energies above the Coulomb barrier. The analysis of the data provides a precise estimation of the precompound contribution with respect to its compound nucleus counterpart. Consistency in the rising trends of the precompound curves with the excitation energy and the atomic mass number of target nuclei indicates their origins from a common density domain within the excited nuclei. This commonality establishes a significant interconnection between nuclear structure and reaction dynamics for the participating surface nucleons in precompound process, except those that are emitted from the closed-shell nucleus in the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>α</mi><mo>+</mo><mmultiscripts><mi>Rb</mi><mprescripts></mprescripts><mn>37</mn><mn>85</mn></mmultiscripts><mspace width=\"4pt\"></mspace><mo>⇒</mo><mspace width=\"4pt\"></mspace><mmultiscripts><mi mathvariant=\"normal\">Y</mi><mprescripts></mprescripts><mn>39</mn><mn>89</mn></mmultiscripts><mspace width=\"4pt\"></mspace><mo>(</mo><mi>N</mi><mo>=</mo><mn>50</mn><mo>)</mo></mrow></math> reaction. The present investigation explores additional understanding of the target deformation in determining the total precompound contribution.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"5 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187023","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}

{"title":"Nucleon-quark mixed matter and neutron-star equation of state","authors":"Y. Yamamoto, N. Yasutake, Th. A. Rijken","doi":"10.1103/physrevc.110.025805","DOIUrl":"https://doi.org/10.1103/physrevc.110.025805","url":null,"abstract":"The nucleon-quark mixed matter is defined in the Brueckner-Hartree-Fock framework, in which quark densities are determined by equilibrium conditions between nucleon and quark chemical potentials, and nucleon-quark interactions play critical roles for resulting equations of state (EoSs). The two models of EoSs are derived from the nucleon-quark mixed matter (NQMM): The NQMM-A EoSs are based on the simple assumption that nucleons and free quarks occupy their respective Fermi levels and their Fermi spheres overlap from each other. In NQMM-B EoSs, the quark Fermi repulsion effect is incorporated on the basis of quarkyonic matter, meaning that the nucleon Fermi levels are pushed up from the quark Fermi sphere by the Pauli exclusion principle. For the NQMM-A EoSs, the neutron-star mass-radius <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo>(</mo><mi>M</mi><mi>R</mi><mo>)</mo></mrow></math> curves are pushed up above the region of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>M</mi><mo>∼</mo><mn>2.1</mn><msub><mi>M</mi><mo>⊙</mo></msub></mrow></math> and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>R</mi><mrow><mn>2.1</mn><msub><mi>M</mi><mo>⊙</mo></msub></mrow></msub><mo>∼</mo><mn>12.5</mn></mrow></math> km indicated by recent observations, as the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>q</mi><mi>N</mi></mrow></math> repulsions increase. For the NQMM-B EoSs, similar results are obtained by the combined contributions from the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>q</mi><mi>N</mi></mrow></math> repulsion and the quark Fermi repulsion. In both models of EoSs, the important roles of the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>q</mi><mi>N</mi></mrow></math> diquark exchange repulsions are demonstrated to reproduce reasonable values of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>M</mi><mi>max</mi></msub></math> and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>R</mi><mrow><mn>2.1</mn><msub><mi>M</mi><mo>⊙</mo></msub></mrow></msub></math>.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"37 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187017","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}

{"title":"Shell-model study for allowed and forbidden β− decay properties in the mass region “south” of Pb208","authors":"Shweta Sharma, Praveen C. Srivastava, Anil Kumar, Toshio Suzuki, Cenxi Yuan, Noritaka Shimizu","doi":"10.1103/physrevc.110.024320","DOIUrl":"https://doi.org/10.1103/physrevc.110.024320","url":null,"abstract":"The large-scale shell-model calculations have been performed for the neutron-rich nuclei in the south region of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Pb</mi><mprescripts></mprescripts><none></none><mn>208</mn></mmultiscripts></math> in the nuclear chart. The <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>β</mi></math>-decay properties, such as the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo form=\"prefix\">log</mo><mi>f</mi><mi>t</mi></mrow></math>, average shape factor values, half-lives, and partial decay rates are calculated for these neutron-rich nuclei using recent effective interaction for the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Pb</mi><mprescripts></mprescripts><none></none><mn>208</mn></mmultiscripts></math> region. These calculations have been performed without truncation in a particular model space for nuclei <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>N</mi><mo>≤</mo><mn>126</mn></mrow></math>; additionally, particle-hole excitations are included in the case of core-breaking nuclei <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo>(</mo><mi>Z</mi><mo>≤</mo><mn>82</mn><mo>,</mo><mi>N</mi><mo>&gt;</mo><mn>126</mn><mo>)</mo></mrow></math>. An extensive comparison with the experimental data has been made, and spin parities of several states have been proposed.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"25 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187015","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}

{"title":"Precise measurements of the γ-ray intensities following the β decay of Ce144 and Nd147","authors":"K. Kolos, N. D. Scielzo, V. E. Iacob, J. C. Hardy, A. M. Hennessy, D. E. M. Hoff, M. A. Stoyer, A. P. Tonchev, M. Bencomo, J. A. Clark, B. Champine, P. Copp, D. Melconian, E. B. Norman, W.-J. Ong, H.-I. Park, D. Santiago-Gonzalez, G. Savard, A. J. Shaka, S. Zhu","doi":"10.1103/physrevc.110.024307","DOIUrl":"https://doi.org/10.1103/physrevc.110.024307","url":null,"abstract":"For many fission products, the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>γ</mi></math> rays emitted following <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>β</mi></math> decay provide an easily detectable signature that can be used to identify their quantities and distributions in a sample. As a result, <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>γ</mi></math>-ray spectroscopy is often exploited to study fission-product yields, provided sufficiently accurate information on the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>γ</mi></math>-ray intensities is available. In many cases, the uncertainties in the existing nuclear data are large enough that they compromise the precision achievable for modern experiments and applications. In this paper, we present high-precision results for the absolute <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>γ</mi></math>-ray emission intensities for the most intense transitions in the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>β</mi></math> decays of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Ce</mi><mprescripts></mprescripts><none></none><mn>144</mn></mmultiscripts></math> and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Nd</mi><mprescripts></mprescripts><none></none><mn>147</mn></mmultiscripts></math>. We measured these intensities to <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo>≲</mo><mn>1</mn><mo>%</mo></mrow></math> accuracy by producing radiopure samples with fission-product beams at CARIBU and detecting the emitted radiation with a <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mn>4</mn><mi>π</mi><mi>β</mi></mrow></math> counter and a meticulously efficiency-calibrated high purity germanium detector at Texas A&amp;M University.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"49 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937995","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}

{"title":"Pauli nonlocality and the nucleon effective mass","authors":"Dao T. Khoa, Doan Thi Loan, Nguyen Hoang Phuc","doi":"10.1103/physrevc.110.024607","DOIUrl":"https://doi.org/10.1103/physrevc.110.024607","url":null,"abstract":"A study of the nucleon mean-field potential in nuclear matter (NM) is done within an extended Hartree-Fock (HF) formalism, using the CDM3Y6 density dependent version of the M3Y interaction which is associated with the nuclear incompressibility &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mi&gt;K&lt;/mi&gt;&lt;mo&gt;≃&lt;/mo&gt;&lt;mn&gt;252&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt; MeV. The momentum dependence of nucleon optical potential (OP) in NM at the saturation density &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msub&gt;&lt;mi&gt;ρ&lt;/mi&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msub&gt;&lt;/math&gt; is shown to be due mainly to its exchange term up to &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mi&gt;k&lt;/mi&gt;&lt;mo&gt;≈&lt;/mo&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mspace width=\"4pt\"&gt;&lt;/mspace&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;fm&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;, so that the Pauli nonlocality is expected to be the main origin of the nucleon effective mass at low momenta. Because nucleons in neutron-rich NM at &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mi&gt;ρ&lt;/mi&gt;&lt;mo&gt;≈&lt;/mo&gt;&lt;msub&gt;&lt;mi&gt;ρ&lt;/mi&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt; are either weakly bound or unbound by the in-medium nucleon-nucleon interaction, the determination of the effective mass of nucleon scattered on targets with neutron excess at low energies should be of interest for the mean-field studies of neutron star matter. For this purpose, the folding model is used to calculate the nonlocal nucleon OP for the optical model analysis of elastic nucleon scattering on &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mmultiscripts&gt;&lt;mi&gt;Ca&lt;/mi&gt;&lt;mprescripts&gt;&lt;/mprescripts&gt;&lt;none&gt;&lt;/none&gt;&lt;mrow&gt;&lt;mn&gt;40&lt;/mn&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mn&gt;48&lt;/mn&gt;&lt;/mrow&gt;&lt;/mmultiscripts&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mo&gt; &lt;/mo&gt;&lt;mmultiscripts&gt;&lt;mi&gt;Zr&lt;/mi&gt;&lt;mprescripts&gt;&lt;/mprescripts&gt;&lt;none&gt;&lt;/none&gt;&lt;mn&gt;90&lt;/mn&gt;&lt;/mmultiscripts&gt;&lt;/math&gt;, and &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mmultiscripts&gt;&lt;mi&gt;Pb&lt;/mi&gt;&lt;mprescripts&gt;&lt;/mprescripts&gt;&lt;none&gt;&lt;/none&gt;&lt;mn&gt;208&lt;/mn&gt;&lt;/mmultiscripts&gt;&lt;/math&gt; targets at energies &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mi&gt;E&lt;/mi&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mn&gt;50&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt; MeV, to probe the model reliability and validate the Wentzel-Kramers-Brillouin (WKB) local approximation to obtain the local folded nucleon OP. The nucleon effective mass &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msup&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;mo&gt;*&lt;/mo&gt;&lt;/msup&gt;&lt;/math&gt; is then carefully deduced from the momentum dependence of the local folded nucleon OP which results from the Pauli nonlocality of the exchange term. The obtained &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msup&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;mo&gt;*&lt;/mo&gt;&lt;/msup&gt;&lt;/math&gt; values agree well with the nucleon effective mass given by the extended HF calculation of the single-particle potential in asymmetric NM. The neutron-proton effective mass splitting determined at &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mi&gt;ρ&lt;/mi&gt;&lt;mo&gt;≈&lt;/mo&gt;&lt;msub&gt;&lt;mi&gt;ρ&lt;/mi&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt; from the central strength of the real folded nucleon OP for &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mmultiscripts&gt;&lt;mi&gt;","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"32 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937996","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}

{"title":"Effect of Coriolis force on electrical conductivity tensor for the rotating hadron resonance gas","authors":"Nandita Padhan, Ashutosh Dwibedi, Arghya Chatterjee, Sabyasachi Ghosh","doi":"10.1103/physrevc.110.024904","DOIUrl":"https://doi.org/10.1103/physrevc.110.024904","url":null,"abstract":"We have investigated the influence of the Coriolis force on the electrical conductivity of hadronic matter formed in relativistic nuclear collisions, employing the hadron resonance gas model. A rotating matter in the peripheral heavy-ion collisions can be expected from the initial stage of quark matter to late-stage hadronic matter. Present work is focused on rotating hadronic matter, whose medium constituents—hadron resonances—can face a nonzero Coriolis force, which can influence the hadronic flow or conductivity. We estimate this conductivity tensor by using the relativistic Boltzmann transport equation. In the absence of Coriolis force, an isotropic conductivity tensor for hadronic matter is expected. However, our study finds that the presence of Coriolis force can generate an anisotropic conductivity tensor with three main conductivity components—parallel, perpendicular, and Hall—similarly to the effect of Lorentz force at a finite magnetic field. Our study has indicated that a noticeable anisotropy of conductivity tensor can be found within the phenomenological range of angular velocity <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi mathvariant=\"normal\">Ω</mi><mo>=</mo><mn>0.001</mn></mrow></math>–0.02 GeV and hadronic scattering radius <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>a</mi><mo>=</mo><mn>0.2</mn></mrow></math>–2 fm.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"2 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937865","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}