Pub Date : 2025-12-01Epub Date: 2025-09-09DOI: 10.1016/j.nuclphysa.2025.123247
Saima Sadiq, Rani Devi, S.K. Khosa
The large-scale shell-model calculations have been performed for neutron-rich even-even titanium isotopes by employing two model spaces: pf (I) and fpg9/2 (II) and various effective interactions. The energy spectra and electromagnetic quantities have been obtained and compared with the available experimental data. The theoretical results on excitation energies and B(E2) values of state confirm the existence of subshell closure at N = 32 and the absence of subshell closure at N = 34. Besides, the B(E2) and B(M1) values of excited states are also predicted for which experimental data are not available. These predictions may serve as a valuable reference for future experimental comparisons.
{"title":"Study of nuclear structure properties of some neutron-rich even-even Titanium isotopes","authors":"Saima Sadiq, Rani Devi, S.K. Khosa","doi":"10.1016/j.nuclphysa.2025.123247","DOIUrl":"10.1016/j.nuclphysa.2025.123247","url":null,"abstract":"<div><div>The large-scale shell-model calculations have been performed for neutron-rich even-even titanium isotopes by employing two model spaces: <em>pf</em> (I) and <em>fpg</em><sub><em>9/2</em></sub> (II) and various effective interactions. The energy spectra and electromagnetic quantities have been obtained and compared with the available experimental data. The theoretical results on excitation energies and B(E2) values of <span><math><msubsup><mn>2</mn><mn>1</mn><mo>+</mo></msubsup></math></span> state confirm the existence of subshell closure at <em>N</em> = 32 and the absence of subshell closure at <em>N</em> = 34. Besides, the B(E2) and B(M1) values of excited states are also predicted for which experimental data are not available. These predictions may serve as a valuable reference for future experimental comparisons.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1064 ","pages":"Article 123247"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2025-12-01Epub Date: 2025-08-05DOI: 10.1016/j.nuclphysa.2025.123203
Kevin S. Becker , Aidan W. Kelly , Kristina D. Launey , Scott T. Marley , Alexis Mercenne , Adriana R. Baniecki , Tomáš Dytrych , Jerry P. Draayer
The ab initio symmetry-adapted no-core shell model is a microscopic many-body method which naturally describes challenging collective and clustering features of atomic nuclei. Wave functions and observables computed with realistic nucleon-nucleon forces in this framework are tied to first principles, and are hence well-suited for rigorous uncertainty quantification. We discuss α-deuteron and α-12C cluster potentials informed by symmetry-adapted calculations, and propagate uncertainties in the effective binary cluster method as well as those in the nuclear interaction to reaction observables, namely scattering phase shifts, cross sections, partial widths and resonance energies. We find that the overall uncertainties are dominated by those originating in the underlying nuclear force, speaking to the need for tighter constraints on realistic nucleon-nucleon interactions.
{"title":"Quantifying uncertainties in α-nucleus reaction dynamics informed from first principles","authors":"Kevin S. Becker , Aidan W. Kelly , Kristina D. Launey , Scott T. Marley , Alexis Mercenne , Adriana R. Baniecki , Tomáš Dytrych , Jerry P. Draayer","doi":"10.1016/j.nuclphysa.2025.123203","DOIUrl":"10.1016/j.nuclphysa.2025.123203","url":null,"abstract":"<div><div>The <em>ab initio</em> symmetry-adapted no-core shell model is a microscopic many-body method which naturally describes challenging collective and clustering features of atomic nuclei. Wave functions and observables computed with realistic nucleon-nucleon forces in this framework are tied to first principles, and are hence well-suited for rigorous uncertainty quantification. We discuss <em>α</em>-deuteron and <em>α</em>-<sup>12</sup>C cluster potentials informed by symmetry-adapted calculations, and propagate uncertainties in the effective binary cluster method as well as those in the nuclear interaction to reaction observables, namely scattering phase shifts, cross sections, partial widths and resonance energies. We find that the overall uncertainties are dominated by those originating in the underlying nuclear force, speaking to the need for tighter constraints on realistic nucleon-nucleon interactions.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1064 ","pages":"Article 123203"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144895329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2025-12-01Epub Date: 2025-09-04DOI: 10.1016/j.nuclphysa.2025.123242
Jose Trujillo, Rachid Ouyed
The r-process nucleosynthesis (in explosive astrophysical events) is responsible for about half of the heavy elements observed in the universe. However, r-process outputs in the literature are difficult to replicate and vary across studies due to differences in nuclear mass models or initial conditions (e.g., seed nuclei). We will review the SiRoP code for -process nucleosynthesis, which now includes an alpha-capture module that allows for a variety of initial conditions and a nuclear sensitivity module to test how changes in nuclear masses affect -process abundance patterns. Additionally, we will examine how different sensitivity metrics influence this behavior.
{"title":"Alpha process nucleosynthesis and sensitivity analysis in SiRoP","authors":"Jose Trujillo, Rachid Ouyed","doi":"10.1016/j.nuclphysa.2025.123242","DOIUrl":"10.1016/j.nuclphysa.2025.123242","url":null,"abstract":"<div><div>The r-process nucleosynthesis (in explosive astrophysical events) is responsible for about half of the heavy elements observed in the universe. However, r-process outputs in the literature are difficult to replicate and vary across studies due to differences in nuclear mass models or initial conditions (e.g., seed nuclei). We will review the SiRoP code for <span><math><mi>r</mi></math></span>-process nucleosynthesis, which now includes an alpha-capture module that allows for a variety of initial conditions and a nuclear sensitivity module to test how changes in nuclear masses affect <span><math><mi>r</mi></math></span>-process abundance patterns. Additionally, we will examine how different sensitivity metrics influence this behavior.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1064 ","pages":"Article 123242"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145045441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2025-12-01Epub Date: 2025-08-21DOI: 10.1016/j.nuclphysa.2025.123224
E.Ya. Paryev
<div><div>In this paper, we investigate the possibility to study the famous charged charmonium-like state <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>(</mo><mn>3900</mn><mo>)</mo></math></span> production off nuclear targets and its properties in inclusive photon-induced reactions near the kinematic threshold within the collision model based on the nuclear spectral function. The model accounts for its charged components <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><msup><mrow><mo>(</mo><mn>3900</mn><mo>)</mo></mrow><mrow><mo>±</mo></mrow></msup></math></span> production in direct photon–nucleon interactions as well as three different popular scenarios for their internal structures: compact tetraquarks, molecules of the two open-charm mesons and mixtures of both of them. We calculate the absolute and relative excitation functions for production of <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><msup><mrow><mo>(</mo><mn>3900</mn><mo>)</mo></mrow><mrow><mo>±</mo></mrow></msup></math></span> mesons on <sup>12</sup>C and <sup>184</sup>W target nuclei at initial photon energies of 9.0–17.5 GeV, the absolute momentum differential cross sections and their ratios for the <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><msup><mrow><mo>(</mo><mn>3900</mn><mo>)</mo></mrow><mrow><mo>±</mo></mrow></msup></math></span> production off these target nuclei at laboratory polar angles of 0<sup>∘</sup>–10<sup>∘</sup> and at photon energy of 14 GeV as well as the A-dependences of the ratios of the total cross sections for <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><msup><mrow><mo>(</mo><mn>3900</mn><mo>)</mo></mrow><mrow><mo>±</mo></mrow></msup></math></span> production at photon energy of 14 GeV within the adopted scenarios for the <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><msup><mrow><mo>(</mo><mn>3900</mn><mo>)</mo></mrow><mrow><mo>±</mo></mrow></msup></math></span> internal structures. Our results in particular indicate that the total cross sections for <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><msup><mrow><mo>(</mo><mn>3900</mn><mo>)</mo></mrow><mrow><mo>+</mo></mrow></msup></math></span><span><math><mo>(</mo><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><msup><mrow><mo>(</mo><mn>3900</mn><mo>)</mo></mrow><mrow><mo>−</mo></mrow></msup><mo>)</mo></math></span> production have at above threshold photon energies of ∼ 13–17 GeV a well measurable strengths ∼ 50–200 (50–200) and 200–1500 (300–2000) nb for carbon and tungsten target nuclei, respectively. Therefore, one might expect to measure these strengths at the upgraded up to 22 GeV CEBAF facility. We also demonstrate that the absolute and relative observables considered show a certain sensitivity to the <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><msup><mrow><mo>(</mo><mn>3900</mn><mo>)</m
{"title":"Photon-induced production of the exotic charged charmonium-like state Zc(3900) off nuclear targets and its internal structure","authors":"E.Ya. Paryev","doi":"10.1016/j.nuclphysa.2025.123224","DOIUrl":"10.1016/j.nuclphysa.2025.123224","url":null,"abstract":"<div><div>In this paper, we investigate the possibility to study the famous charged charmonium-like state <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>(</mo><mn>3900</mn><mo>)</mo></math></span> production off nuclear targets and its properties in inclusive photon-induced reactions near the kinematic threshold within the collision model based on the nuclear spectral function. The model accounts for its charged components <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><msup><mrow><mo>(</mo><mn>3900</mn><mo>)</mo></mrow><mrow><mo>±</mo></mrow></msup></math></span> production in direct photon–nucleon interactions as well as three different popular scenarios for their internal structures: compact tetraquarks, molecules of the two open-charm mesons and mixtures of both of them. We calculate the absolute and relative excitation functions for production of <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><msup><mrow><mo>(</mo><mn>3900</mn><mo>)</mo></mrow><mrow><mo>±</mo></mrow></msup></math></span> mesons on <sup>12</sup>C and <sup>184</sup>W target nuclei at initial photon energies of 9.0–17.5 GeV, the absolute momentum differential cross sections and their ratios for the <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><msup><mrow><mo>(</mo><mn>3900</mn><mo>)</mo></mrow><mrow><mo>±</mo></mrow></msup></math></span> production off these target nuclei at laboratory polar angles of 0<sup>∘</sup>–10<sup>∘</sup> and at photon energy of 14 GeV as well as the A-dependences of the ratios of the total cross sections for <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><msup><mrow><mo>(</mo><mn>3900</mn><mo>)</mo></mrow><mrow><mo>±</mo></mrow></msup></math></span> production at photon energy of 14 GeV within the adopted scenarios for the <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><msup><mrow><mo>(</mo><mn>3900</mn><mo>)</mo></mrow><mrow><mo>±</mo></mrow></msup></math></span> internal structures. Our results in particular indicate that the total cross sections for <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><msup><mrow><mo>(</mo><mn>3900</mn><mo>)</mo></mrow><mrow><mo>+</mo></mrow></msup></math></span><span><math><mo>(</mo><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><msup><mrow><mo>(</mo><mn>3900</mn><mo>)</mo></mrow><mrow><mo>−</mo></mrow></msup><mo>)</mo></math></span> production have at above threshold photon energies of ∼ 13–17 GeV a well measurable strengths ∼ 50–200 (50–200) and 200–1500 (300–2000) nb for carbon and tungsten target nuclei, respectively. Therefore, one might expect to measure these strengths at the upgraded up to 22 GeV CEBAF facility. We also demonstrate that the absolute and relative observables considered show a certain sensitivity to the <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi></mrow></msub><msup><mrow><mo>(</mo><mn>3900</mn><mo>)</m","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1064 ","pages":"Article 123224"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144895343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2025-12-01Epub Date: 2025-09-11DOI: 10.1016/j.nuclphysa.2025.123245
Rajesh K. Sahoo , Dharmendra Singh , Amritraj Mahato , Pankaj K. Giri , Nitin Sharma , Lupteindu Chhura , Rahul Mahato , Sneha B. Linda , Harish Kumar , Suhail A. Tali , Rahbar Ali , M. Afzal Ansari , R. Kumar , S. Muralithar , R.P. Singh
<div><div>The study investigates partial linear momentum transfer in the non-compound nuclear fusion (NCNF) process by analyzing the forward recoil range distributions (FRRDs) of evaporation residues (ERs) produced in the <span><math><msup><mrow></mrow><mn>18</mn></msup></math></span>O+<span><math><msup><mrow></mrow><mn>154</mn></msup></math></span>Sm system at projectile energy <span><math><mo>≈</mo></math></span> 5.27 MeV/nucleon. The ERs formed through xn and pxn evaporation channels exhibit single-peaked gaussian distributions in forward recoil ranges while their range-integrated cross sections alines well with theoretical prediction of PACE-4 code. These results show the signature of complete momentum transfer and formation of a compound nucleus <span><math><msup><mrow></mrow><mn>172</mn></msup></math></span>Yb*. However, ERs produced via <span><math><mi>α</mi></math></span> spectator channels shows single peaked gaussian distribution in forward recoil ranges but with a shorter mean ranges and larger cross sections than theoretical predictions. This result suggests that partial momentum transfer results from the breakup of <span><math><msup><mrow></mrow><mn>18</mn></msup></math></span>O into <span><math><msup><mrow></mrow><mn>14</mn></msup></math></span>C+<span><math><mi>α</mi></math></span>, contributing to the formation of an intermediate <span><math><msup><mrow></mrow><mn>168</mn></msup></math></span>Er* composite system. To investigate isotopic effects on NCNF dynamics, reactions induced by <span><math><msup><mrow></mrow><mn>16</mn></msup></math></span>O and <span><math><msup><mrow></mrow><mn>18</mn></msup></math></span>O projectiles were compared within the framework of Z<span><math><msub><mrow></mrow><mi>P</mi></msub></math></span>Z<span><math><msub><mrow></mrow><mi>T</mi></msub></math></span> and total asymmetry (<span><math><msubsup><mi>μ</mi><mrow><mi>c</mi><mi>m</mi></mrow><mi>T</mi></msubsup></math></span>). At energies <span><math><mo>≈</mo></math></span> 10<span><math><mo>%</mo></math></span> above the coulomb barrier, both projectiles exhibit comparable NCNF contributions. However, at projectile energies <span><math><mo>≥</mo></math></span> 30<span><math><mo>%</mo></math></span> above the Coulomb barrier, <span><math><msup><mrow></mrow><mn>18</mn></msup></math></span>O exhibits a significantly higher NCNF contribution as compare to <span><math><msup><mrow></mrow><mn>16</mn></msup></math></span>O. Further, the critical angular momentum increases exponentially with both Z<span><math><msub><mrow></mrow><mi>P</mi></msub></math></span>Z<span><math><msub><mrow></mrow><mi>T</mi></msub></math></span> and <span><math><msubsup><mi>μ</mi><mrow><mi>c</mi><mi>m</mi></mrow><mi>T</mi></msubsup></math></span>, establishing these parameters as key factors in onset of the NCNF process. Additionally, the study finds also that fusion suppression depends on projectile’s <span><math><mi>α</mi></math></span>-separation energy. A generalized expressio
{"title":"Compound and non-compound nuclear fusion using forward recoil range distributions of evaporation residues produced in 18O+154Sm system","authors":"Rajesh K. Sahoo , Dharmendra Singh , Amritraj Mahato , Pankaj K. Giri , Nitin Sharma , Lupteindu Chhura , Rahul Mahato , Sneha B. Linda , Harish Kumar , Suhail A. Tali , Rahbar Ali , M. Afzal Ansari , R. Kumar , S. Muralithar , R.P. Singh","doi":"10.1016/j.nuclphysa.2025.123245","DOIUrl":"10.1016/j.nuclphysa.2025.123245","url":null,"abstract":"<div><div>The study investigates partial linear momentum transfer in the non-compound nuclear fusion (NCNF) process by analyzing the forward recoil range distributions (FRRDs) of evaporation residues (ERs) produced in the <span><math><msup><mrow></mrow><mn>18</mn></msup></math></span>O+<span><math><msup><mrow></mrow><mn>154</mn></msup></math></span>Sm system at projectile energy <span><math><mo>≈</mo></math></span> 5.27 MeV/nucleon. The ERs formed through xn and pxn evaporation channels exhibit single-peaked gaussian distributions in forward recoil ranges while their range-integrated cross sections alines well with theoretical prediction of PACE-4 code. These results show the signature of complete momentum transfer and formation of a compound nucleus <span><math><msup><mrow></mrow><mn>172</mn></msup></math></span>Yb*. However, ERs produced via <span><math><mi>α</mi></math></span> spectator channels shows single peaked gaussian distribution in forward recoil ranges but with a shorter mean ranges and larger cross sections than theoretical predictions. This result suggests that partial momentum transfer results from the breakup of <span><math><msup><mrow></mrow><mn>18</mn></msup></math></span>O into <span><math><msup><mrow></mrow><mn>14</mn></msup></math></span>C+<span><math><mi>α</mi></math></span>, contributing to the formation of an intermediate <span><math><msup><mrow></mrow><mn>168</mn></msup></math></span>Er* composite system. To investigate isotopic effects on NCNF dynamics, reactions induced by <span><math><msup><mrow></mrow><mn>16</mn></msup></math></span>O and <span><math><msup><mrow></mrow><mn>18</mn></msup></math></span>O projectiles were compared within the framework of Z<span><math><msub><mrow></mrow><mi>P</mi></msub></math></span>Z<span><math><msub><mrow></mrow><mi>T</mi></msub></math></span> and total asymmetry (<span><math><msubsup><mi>μ</mi><mrow><mi>c</mi><mi>m</mi></mrow><mi>T</mi></msubsup></math></span>). At energies <span><math><mo>≈</mo></math></span> 10<span><math><mo>%</mo></math></span> above the coulomb barrier, both projectiles exhibit comparable NCNF contributions. However, at projectile energies <span><math><mo>≥</mo></math></span> 30<span><math><mo>%</mo></math></span> above the Coulomb barrier, <span><math><msup><mrow></mrow><mn>18</mn></msup></math></span>O exhibits a significantly higher NCNF contribution as compare to <span><math><msup><mrow></mrow><mn>16</mn></msup></math></span>O. Further, the critical angular momentum increases exponentially with both Z<span><math><msub><mrow></mrow><mi>P</mi></msub></math></span>Z<span><math><msub><mrow></mrow><mi>T</mi></msub></math></span> and <span><math><msubsup><mi>μ</mi><mrow><mi>c</mi><mi>m</mi></mrow><mi>T</mi></msubsup></math></span>, establishing these parameters as key factors in onset of the NCNF process. Additionally, the study finds also that fusion suppression depends on projectile’s <span><math><mi>α</mi></math></span>-separation energy. A generalized expressio","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1064 ","pages":"Article 123245"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145219896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2025-12-01Epub Date: 2025-09-18DOI: 10.1016/j.nuclphysa.2025.123248
N. Imai , M. Dozono , S. Bae , S. Michimasa , T. Sumikama , S. Ota , S. Hayakawa , J.W. Hwang , K. Iribe , C. Iwamoto , S. Kawase , K. Kawata , N. Kitamura , S. Masuoka , K. Nakano , P. Schrock , D. Suzuki , R. Tsunoda , K. Wimmer , T. Chillery , S. Shimoura
To determine the neutron capture rates of radioactive nuclei, we have developed an experimental technique using surrogate reactions, specifically the (d, p) reaction in inverse kinematics. The gamma-emission probabilities from unbound states were deduced by identifying the outgoing reaction residues, instead of detecting the de-excitation rays from the compound states. Such experiments have become feasible through the use of the OEDO device, which enables beam deceleration and focusing, and the SHARAQ spectrometer at RIBF. We applied this technique to measure the neutron capture rates of Se for nuclear transmutation data, and of Sn for studies related to the -process. In this contribution, we discuss the neutron-capture cross sections of Se using the surrogate ratio method, and introduce the updated experimental setup for the Sn measurement.
{"title":"The surrogate reactions for the neutron-capture rate using OEDO and SHARAQ in RIBF","authors":"N. Imai , M. Dozono , S. Bae , S. Michimasa , T. Sumikama , S. Ota , S. Hayakawa , J.W. Hwang , K. Iribe , C. Iwamoto , S. Kawase , K. Kawata , N. Kitamura , S. Masuoka , K. Nakano , P. Schrock , D. Suzuki , R. Tsunoda , K. Wimmer , T. Chillery , S. Shimoura","doi":"10.1016/j.nuclphysa.2025.123248","DOIUrl":"10.1016/j.nuclphysa.2025.123248","url":null,"abstract":"<div><div>To determine the neutron capture rates of radioactive nuclei, we have developed an experimental technique using surrogate reactions, specifically the (<em>d, p</em>) reaction in inverse kinematics. The gamma-emission probabilities from unbound states were deduced by identifying the outgoing reaction residues, instead of detecting the de-excitation <span><math><mi>γ</mi></math></span> rays from the compound states. Such experiments have become feasible through the use of the OEDO device, which enables beam deceleration and focusing, and the SHARAQ spectrometer at RIBF. We applied this technique to measure the neutron capture rates of <span><math><msup><mrow></mrow><mn>79</mn></msup></math></span>Se for nuclear transmutation data, and of <span><math><msup><mrow></mrow><mn>130</mn></msup></math></span>Sn for studies related to the <span><math><mi>r</mi></math></span>-process. In this contribution, we discuss the neutron-capture cross sections of <span><math><msup><mrow></mrow><mn>79</mn></msup></math></span>Se using the surrogate ratio method, and introduce the updated experimental setup for the <span><math><msup><mrow></mrow><mn>130</mn></msup></math></span>Sn measurement.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1064 ","pages":"Article 123248"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2025-12-01Epub Date: 2025-08-18DOI: 10.1016/j.nuclphysa.2025.123222
Praveen K. Yadav , Raj Kumar , M. Bhuyan
In a recent study [Europhys. Lett. 146, (2024), 14001], a novel relativistic parameterisation of the energy density functional (EDF) at local density was integrated into the coherent density fluctuation model (CDFM). This approach employed the density-dependent DD-ME2 parameter within the relativistic Hartree-Bogoliubov framework, alongside the well-established non-linear NL3 force parameter, to investigate the surface properties of a few doubly-magic nuclei. In the present work, we extend this new relativistic EDF formulation to a much broader region: the evolution of shell structure across several open- and closed-shell nuclei of intermediate-mass isotopic chains, specifically Kr (), Sr (), Te (), Xe (), Ba (), Ce (), Nd () and Sm (). Using the CDFM formalism, we translate key nuclear matter quantities, such as the symmetry energy and its derivatives, from momentum space to coordinate space at local densities. This procedure is particularly relevant when investigating nuclei near the drip lines. Our findings demonstrate that the symmetry energy successfully reproduces the conventional magic numbers and 82 while indicating the emergence of new shell and/or sub-shell closures around and 92. Furthermore, we decompose the symmetry energy into its volume and surface components, using two approaches, and perform an extensive comparison to assess their impact on the identification of shell closures. We also examine how neutron-proton asymmetry influences the symmetry energy along these isotopic chains. In general, this study highlights novel regions of interest in the medium-mass region of the nuclear chart. It emphasises the need for experimental investigations of the newly suggested shell closures.
{"title":"Isospin dependence of shell closure at N = 90 and 92 for medium mass nuclei using relativistic energy density functional","authors":"Praveen K. Yadav , Raj Kumar , M. Bhuyan","doi":"10.1016/j.nuclphysa.2025.123222","DOIUrl":"10.1016/j.nuclphysa.2025.123222","url":null,"abstract":"<div><div>In a recent study [Europhys. Lett. <strong>146</strong>, (2024), 14001], a novel relativistic parameterisation of the energy density functional (EDF) at local density was integrated into the coherent density fluctuation model (CDFM). This approach employed the density-dependent DD-ME2 parameter within the relativistic Hartree-Bogoliubov framework, alongside the well-established non-linear NL3 force parameter, to investigate the surface properties of a few doubly-magic nuclei. In the present work, we extend this new relativistic EDF formulation to a much broader region: the evolution of shell structure across several open- and closed-shell nuclei of intermediate-mass isotopic chains, specifically Kr (<span><math><mi>Z</mi><mo>=</mo><mn>36</mn></math></span>), Sr (<span><math><mi>Z</mi><mo>=</mo><mn>38</mn></math></span>), Te (<span><math><mi>Z</mi><mo>=</mo><mn>52</mn></math></span>), Xe (<span><math><mi>Z</mi><mo>=</mo><mn>54</mn></math></span>), Ba (<span><math><mi>Z</mi><mo>=</mo><mn>56</mn></math></span>), Ce (<span><math><mi>Z</mi><mo>=</mo><mn>58</mn></math></span>), Nd (<span><math><mi>Z</mi><mo>=</mo><mn>60</mn></math></span>) and Sm (<span><math><mi>Z</mi><mo>=</mo><mn>62</mn></math></span>). Using the CDFM formalism, we translate key nuclear matter quantities, such as the symmetry energy and its derivatives, from momentum space to coordinate space at local densities. This procedure is particularly relevant when investigating nuclei near the drip lines. Our findings demonstrate that the symmetry energy successfully reproduces the conventional magic numbers <span><math><mi>N</mi><mo>=</mo><mn>50</mn></math></span> and 82 while indicating the emergence of new shell and/or sub-shell closures around <span><math><mi>N</mi><mo>=</mo><mn>90</mn></math></span> and 92. Furthermore, we decompose the symmetry energy into its volume and surface components, using two approaches, and perform an extensive comparison to assess their impact on the identification of shell closures. We also examine how neutron-proton asymmetry influences the symmetry energy along these isotopic chains. In general, this study highlights novel regions of interest in the medium-mass region of the nuclear chart. It emphasises the need for experimental investigations of the newly suggested shell closures.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1064 ","pages":"Article 123222"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144865514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2025-12-01Epub Date: 2025-08-14DOI: 10.1016/j.nuclphysa.2025.123219
Wei Hong , Di Gao , Yanjun Sun
We investigate the twist-2 distribution amplitudes of the scalar mesons and in the two-quark picture. The moments of these scalar mesons are obtained up to the third order with QCD sum rules method. With these moments, the first two Gegenbauer coefficients are determined and utilized to analyze the twist-2 distribution amplitudes. Our numerical results indicate that the meson favors a conventional two-quark ground state. The paper concludes with an examination of the form factors for the transitions .
{"title":"Twist-2 distribution amplitudes of a0(980) and a0(1450)","authors":"Wei Hong , Di Gao , Yanjun Sun","doi":"10.1016/j.nuclphysa.2025.123219","DOIUrl":"10.1016/j.nuclphysa.2025.123219","url":null,"abstract":"<div><div>We investigate the twist-2 distribution amplitudes of the scalar mesons <span><math><msub><mrow><mi>a</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>(</mo><mn>980</mn><mo>)</mo></math></span> and <span><math><msub><mrow><mi>a</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>(</mo><mn>1450</mn><mo>)</mo></math></span> in the two-quark picture. The moments of these scalar mesons are obtained up to the third order with QCD sum rules method. With these moments, the first two Gegenbauer coefficients are determined and utilized to analyze the twist-2 distribution amplitudes. Our numerical results indicate that the meson <span><math><msub><mrow><mi>a</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>(</mo><mn>980</mn><mo>)</mo></math></span> favors a conventional two-quark ground state. The paper concludes with an examination of the form factors for the transitions <span><math><mi>B</mi><mo>/</mo><mi>D</mi><mo>→</mo><msub><mrow><mi>a</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span>.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1064 ","pages":"Article 123219"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144886303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2025-12-01Epub Date: 2025-09-04DOI: 10.1016/j.nuclphysa.2025.123241
P.S. Rawat, S. Kumar
In the nuclear landscape, many isomeric states near the shell closure decay via enhanced electric octupole transitions. The enhancement in the transition strength is linked to the nuclear interactions between shell-model orbitals near the Fermi level that differ by , involving high- intruder orbitals. The present study investigates the systematics of reduced transition probabilities in even-A nuclei with proton numbers . Experimental data were taken from the ENSDF, NSR and XUNDL databases. For recently measured transitions, updated half-lives and branching ratios were used to determine refined values, calculated using the RULER code. The observed systematic trend across various closed shells indicates that the octupole correlations are strongly developed in the heavier mass region. The transition rates were further analysed according to the type of transition and their underlying configurations. The results reveal a clear pattern: nuclei with configurations involving octupole-driving orbitals show significantly enhanced values, whereas the spin-flip and single-particle transitions exhibit much weaker strengths.
{"title":"Systematics of reduced B(E3) transition probabilities for E3 transitions in even-A nuclei in 50 ≤ Z ≤ 92 region","authors":"P.S. Rawat, S. Kumar","doi":"10.1016/j.nuclphysa.2025.123241","DOIUrl":"10.1016/j.nuclphysa.2025.123241","url":null,"abstract":"<div><div>In the nuclear landscape, many isomeric states near the shell closure decay via enhanced electric octupole <span><math><mrow><mo>(</mo><mi>E</mi><mn>3</mn><mo>)</mo></mrow></math></span> transitions. The enhancement in the transition strength is linked to the nuclear interactions between shell-model orbitals near the Fermi level that differ by <span><math><mrow><mstyle><mi>Δ</mi></mstyle><mi>j</mi><mo>=</mo><mspace></mspace><mstyle><mi>Δ</mi></mstyle><mi>l</mi><mo>=</mo><mn>3</mn></mrow></math></span>, involving high-<span><math><mi>j</mi></math></span> intruder orbitals. The present study investigates the systematics of reduced <span><math><mrow><mi>B</mi><mo>(</mo><mi>E</mi><mn>3</mn><mo>)</mo></mrow></math></span> transition probabilities in even-A nuclei with proton numbers <span><math><mrow><mi>Z</mi><mo>=</mo><mn>50</mn><mo>−</mo><mn>92</mn></mrow></math></span>. Experimental data were taken from the ENSDF, NSR and XUNDL databases. For recently measured <span><math><mrow><mi>E</mi><mn>3</mn></mrow></math></span> transitions, updated half-lives and branching ratios were used to determine refined <span><math><mrow><mi>B</mi><mo>(</mo><mi>E</mi><mn>3</mn><mo>)</mo></mrow></math></span> values, calculated using the RULER code. The observed systematic trend across various closed shells indicates that the octupole correlations are strongly developed in the heavier mass region. The transition rates were further analysed according to the type of <span><math><mrow><mi>E</mi><mn>3</mn></mrow></math></span> transition and their underlying configurations. The results reveal a clear pattern: nuclei with configurations involving octupole-driving orbitals show significantly enhanced <span><math><mrow><mi>B</mi><mo>(</mo><mi>E</mi><mn>3</mn><mo>)</mo></mrow></math></span> values, whereas the spin-flip and single-particle <span><math><mrow><mi>E</mi><mn>3</mn></mrow></math></span> transitions exhibit much weaker strengths.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1064 ","pages":"Article 123241"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145060605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2025-12-01Epub Date: 2025-08-28DOI: 10.1016/j.nuclphysa.2025.123228
Nghia Nguyen Huu, Anh Tran Tuan, Thang Le Xuan, Thien Tran Quang, Huong Tuong Thi Thu, Dao Nguyen Minh, Tham Vo Thi Mong
This study evaluates the first-digit distribution of experimental data and semi-empirically calculated data of the thermal neutron capture cross-sections for reactions. The data for 122 isotopes were analyzed, with the scope extended to a total of 558 isotopes, including both ground and isomeric states. The results demonstrate a strong agreement with Benford's law across both datasets. However, a notable deviation is observed for the digit 8, where Mughabghab's calculated values exceed theoretical expectations. This discrepancy suggests a need for further scrutiny of the values for four isotopes: 177Lu, 182Ta, 94Nb and 99Mo need to be more carefully considered in future evaluations, due to the significant errors in the elemental concentrations of these isotopes determined by the neutron activation analysis (NAA). Additionally, the theoretical model used for thermal neutron capture cross-section calculations follows a statistical model. The findings of this study not only validate the applicability of Benford's law in nuclear physics but also provide a promising approach for verifying both experimental and theoretical datasets, which is crucial for enhancing the precision of NAA in determining elemental concentrations.
{"title":"Benford's law and thermal neutron capture cross-section of A(n,γ)B reactions","authors":"Nghia Nguyen Huu, Anh Tran Tuan, Thang Le Xuan, Thien Tran Quang, Huong Tuong Thi Thu, Dao Nguyen Minh, Tham Vo Thi Mong","doi":"10.1016/j.nuclphysa.2025.123228","DOIUrl":"10.1016/j.nuclphysa.2025.123228","url":null,"abstract":"<div><div>This study evaluates the first-digit distribution of experimental data and semi-empirically calculated data of the thermal neutron capture cross-sections <span><math><mi>σ</mi><mo>(</mo><mi>n</mi><mo>,</mo><mi>γ</mi><mo>)</mo></math></span> for <span><math><mi>A</mi><mo>(</mo><mi>n</mi><mo>,</mo><mi>γ</mi><mo>)</mo><mi>B</mi></math></span> reactions. The <span><math><mi>σ</mi><mo>(</mo><mi>n</mi><mo>,</mo><mi>γ</mi><mo>)</mo></math></span> data for 122 isotopes were analyzed, with the scope extended to a total of 558 isotopes, including both ground and isomeric states. The results demonstrate a strong agreement with Benford's law across both datasets. However, a notable deviation is observed for the digit 8, where Mughabghab's calculated values exceed theoretical expectations. This discrepancy suggests a need for further scrutiny of the <span><math><mi>σ</mi><mo>(</mo><mi>n</mi><mo>,</mo><mi>γ</mi><mo>)</mo></math></span> values for four isotopes: <sup>177</sup>Lu, <sup>182</sup>Ta, <sup>94</sup>Nb and <sup>99</sup>Mo need to be more carefully considered in future evaluations, due to the significant errors in the elemental concentrations of these isotopes determined by the neutron activation analysis (NAA). Additionally, the theoretical model used for thermal neutron capture cross-section calculations follows a statistical model. The findings of this study not only validate the applicability of Benford's law in nuclear physics but also provide a promising approach for verifying both experimental and theoretical datasets, which is crucial for enhancing the precision of NAA in determining elemental concentrations.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1064 ","pages":"Article 123228"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144921793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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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