Pub Date : 2026-02-01Epub Date: 2025-11-20DOI: 10.1016/j.nuclphysa.2025.123287
Faisal Etminan
The deuteron-deuteron (D-D) thermonuclear reaction rates in metallic environments, accounting for electron screening effects, are calculated using S-factor functions derived from fits to low-energy D-D reaction data. For this purpose, a fitted S-factor model based on the NACRE compilation is employed, which constrains the energy range applicable to Big Bang nucleosynthesis (BBN) for the 2H(d, p)3H and 2H(d, n)3He reactions. The Maxwellian-averaged thermonuclear reaction rates, relevant to astrophysical plasmas at temperatures ranging from 106 K to 1010 K (or 1.3 × 108 K), are presented in tabular formats. The effects of electron screening are phenomenologically analyzed, with screening energy (Ue) values of 100, 400, 750, 1000, and 1250 eV being employed for this purpose. This selection of values is grounded in theoretical and experimental studies conducted to date. Ultimately, the numerical analysis reveals that the ratio of the screened reaction rate to the unscreened reaction rate can be expressed by the numerical formula for both the 2H(d, p)3H and 2H(d, n)3He reactions.
{"title":"The role of the screening potential in the deuteron-deuteron thermonuclear reaction rates","authors":"Faisal Etminan","doi":"10.1016/j.nuclphysa.2025.123287","DOIUrl":"10.1016/j.nuclphysa.2025.123287","url":null,"abstract":"<div><div>The deuteron-deuteron (D-D) thermonuclear reaction rates in metallic environments, accounting for electron screening effects, are calculated using S-factor functions derived from fits to low-energy D-D reaction data. For this purpose, a fitted S-factor model based on the NACRE compilation is employed, which constrains the energy range applicable to Big Bang nucleosynthesis (BBN) for the <sup>2</sup>H(<em>d, p</em>)<sup>3</sup>H and <sup>2</sup>H(<em>d, n</em>)<sup>3</sup>He reactions. The Maxwellian-averaged thermonuclear reaction rates, relevant to astrophysical plasmas at temperatures ranging from 10<sup>6</sup> K to 10<sup>10</sup> K (or 1.3 × 10<sup>8</sup> K), are presented in tabular formats. The effects of electron screening are phenomenologically analyzed, with screening energy (<em>U<sub>e</sub></em>) values of 100, 400, 750, 1000, and 1250 eV being employed for this purpose. This selection of values is grounded in theoretical and experimental studies conducted to date. Ultimately, the numerical analysis reveals that the ratio of the screened reaction rate to the unscreened reaction rate can be expressed by the numerical formula <span><math><mrow><mi>exp</mi><mrow><mo>(</mo><mn>4.70</mn><mo>+</mo><mn>6.50</mn><mrow><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>6</mn></mrow></msup></mrow><msub><mi>U</mi><mi>e</mi></msub><mo>/</mo><msub><mi>T</mi><mn>9</mn></msub><mo>)</mo></mrow></mrow></math></span> for both the <sup>2</sup>H(<em>d, p</em>)<sup>3</sup>H and <sup>2</sup>H(<em>d, n</em>)<sup>3</sup>He reactions.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1066 ","pages":"Article 123287"},"PeriodicalIF":2.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145615022","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 : 2026-02-01Epub Date: 2025-11-04DOI: 10.1016/j.nuclphysa.2025.123273
C. Fougères , O. Roig , M. Pottier , L. Gaudefroy , V. Méot
A spectroscopic study of the isomeric state in 209Pb has been performed to shed more light on the octupole phonons near the doubly-magic nucleus 208Pb. Populated by neutron-transfer reactions 208Pb(d, p)209Pb*, the de-exciting nuclei of interest were measured with the SFγNCS array, a versatile set-up comprising a silicon telescope and 60 NaI(Tl) detectors. Determined with particle-γ-ray coincidences, the branching ratio and multipolarity of the aimed γ-ray transition of the state in 209Pb were found to be consistent with the literature. The state lifetime was precisely measured with the delayed coincidence method. The resulting reduced transition probability W.u. is an order of magnitude more precise than previously reported. An analysis in terms of the particle-octupole-vibration coupling model led to a reevaluation of the neutron E3 effective charge. This new experimental result on the lifetime of the octupole state in 209Pb should help future investigations to constrain the nature of states in 207,208,209Pb.
{"title":"A new lifetime measurement of the 15/21− octupole state in 209Pb","authors":"C. Fougères , O. Roig , M. Pottier , L. Gaudefroy , V. Méot","doi":"10.1016/j.nuclphysa.2025.123273","DOIUrl":"10.1016/j.nuclphysa.2025.123273","url":null,"abstract":"<div><div>A spectroscopic study of the <span><math><mrow><mn>15</mn><mo>/</mo><msubsup><mn>2</mn><mn>1</mn><mo>−</mo></msubsup></mrow></math></span> isomeric state in <sup>209</sup>Pb has been performed to shed more light on the octupole phonons near the doubly-magic nucleus <sup>208</sup>Pb. Populated by neutron-transfer reactions <sup>208</sup>Pb(<em>d, p</em>)<sup>209</sup>Pb*, the de-exciting nuclei of interest were measured with the SF<em>γ</em>NCS array, a versatile set-up comprising a silicon telescope and 60 NaI(Tl) detectors. Determined with particle-<em>γ</em>-ray coincidences, the branching ratio and multipolarity of the aimed <em>γ</em>-ray transition of the <span><math><mrow><mn>15</mn><mo>/</mo><msubsup><mn>2</mn><mn>1</mn><mo>−</mo></msubsup></mrow></math></span> state in <sup>209</sup>Pb were found to be consistent with the literature. The state lifetime was precisely measured with the delayed coincidence method. The resulting reduced transition probability <span><math><mrow><mi>B</mi><mrow><mo>(</mo><mi>E</mi><mn>3</mn><mo>,</mo><mn>15</mn><mo>/</mo><msubsup><mn>2</mn><mn>1</mn><mo>−</mo></msubsup><mo>→</mo><mn>9</mn><mo>/</mo><msubsup><mn>2</mn><mn>1</mn><mo>+</mo></msubsup><mo>)</mo></mrow><mo>=</mo><mn>24.2</mn><mrow><mo>(</mo><mn>4</mn><mo>)</mo></mrow></mrow></math></span> W.u. is an order of magnitude more precise than previously reported. An analysis in terms of the particle-octupole-vibration coupling model led to a reevaluation of the neutron <em>E</em>3 effective charge. This new experimental result on the lifetime of the <span><math><mrow><mn>15</mn><mo>/</mo><msubsup><mn>2</mn><mn>1</mn><mo>−</mo></msubsup></mrow></math></span> octupole state in <sup>209</sup>Pb should help future investigations to constrain the nature of states in <sup>207,208,209</sup>Pb.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1066 ","pages":"Article 123273"},"PeriodicalIF":2.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145517834","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 : 2026-02-01Epub Date: 2025-10-22DOI: 10.1016/j.nuclphysa.2025.123268
Mohamed K. Al-Sugheir , Bassam R. Joudeh , O. Abu-Haija , Ibtisam F. Al-Maaitah , Derar Altarawneh , Sufian Alnemrat , Humam B. Ghassib
The Static Fluctuation Approximation (SFA) is used to calculate the momentum distributions, chemical potentials, and Helmholtz (free) energy of asymmetric nuclear matter with the Argonne interaction potential AV18. The results indicate that, as the linear momentum , the momentum distributions of both neutrons and protons increase with decreasing temperature. Further, in this limit, the momentum distributions increase with increasing number density ρ. In symmetric nuclear matter, the momentum distributions of neutrons and protons are, of course, identical. In contrast, however, in asymmetric nuclear matter, as the isospin-asymmetric parameter increases, the momentum distribution of neutrons increases; whereas that of protons decreases. The chemical potential results show that the Fermi temperature of neutrons is greater than that of protons, i.e., the neutrons remain in the quantum regime at a temperature greater than that for the protons. We also find that, in the low ρ-limit, both protons and neutrons exist in the classical regime. The protons cross over from the classical to the quantum regime at a density greater than that for the neutrons. The Helmholtz energy is calculated as a function of ρ, temperature, and isospin parameter. It increases with ρ, decreases with temperature, and exhibits a parabolic dependence on the isospin parameter.
Our results agree quite well with those of other theoretical approaches. Together with our previous SFA work, the present calculations demonstrate yet again the reliability of this formalism for low-energy, nonrelativistic nuclear matter.
{"title":"Momentum distributions, chemical potential, and free energy of asymmetric nuclear matter using the static fluctuation approximation","authors":"Mohamed K. Al-Sugheir , Bassam R. Joudeh , O. Abu-Haija , Ibtisam F. Al-Maaitah , Derar Altarawneh , Sufian Alnemrat , Humam B. Ghassib","doi":"10.1016/j.nuclphysa.2025.123268","DOIUrl":"10.1016/j.nuclphysa.2025.123268","url":null,"abstract":"<div><div>The Static Fluctuation Approximation (SFA) is used to calculate the momentum distributions, chemical potentials, and Helmholtz (free) energy of asymmetric nuclear matter with the Argonne interaction potential AV<sub>18</sub>. The results indicate that, as the linear momentum <span><math><mrow><mi>k</mi><mi>→</mi><mn>0</mn></mrow></math></span>, the momentum distributions of both neutrons and protons increase with decreasing temperature. Further, in this limit, the momentum distributions increase with increasing number density ρ. In symmetric nuclear matter, the momentum distributions of neutrons and protons are, of course, identical. In contrast, however, in asymmetric nuclear matter, as the isospin-asymmetric parameter increases, the momentum distribution of neutrons increases; whereas that of protons decreases. The chemical potential results show that the Fermi temperature of neutrons is greater than that of protons, i.e., the neutrons remain in the quantum regime at a temperature greater than that for the protons. We also find that, in the low ρ-limit, both protons and neutrons exist in the classical regime. The protons cross over from the classical to the quantum regime at a density greater than that for the neutrons. The Helmholtz energy is calculated as a function of ρ, temperature, and isospin parameter. It increases with ρ, decreases with temperature, and exhibits a parabolic dependence on the isospin parameter.</div><div>Our results agree quite well with those of other theoretical approaches. Together with our previous SFA work, the present calculations demonstrate yet again the reliability of this formalism for low-energy, nonrelativistic nuclear matter.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1066 ","pages":"Article 123268"},"PeriodicalIF":2.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145374450","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 : 2026-02-01Epub Date: 2025-10-31DOI: 10.1016/j.nuclphysa.2025.123265
A. Karmakar , P. Datta , S.S. Nayak , Soumik Bhattacharya , Suchorita Paul , Snigdha Pal , S. Bhattacharyya , G. Mukherjee , S. Basu , S. Chakraborty , S. Panwar , Pankaj K. Giri , R. Raut , S.S. Ghugre , R. Palit , Sajad Ali , W. Shaikh , S. Chattopadhyay
The high spin level structures of Mo have been studied through discrete -ray spectroscopy. This study extends the existing band structures to higher spins and also shows two new E3 transitions. The spin and parity of most energy levels have been uniquely established from the present dataset. An extensive comparison with , an octupole-deformed nucleus in the mass 100 region, reveals similarities that suggest the presence of octupole collectivity in . This observation is relevant in establishing A 100 as another valley of octupole collectivity.
{"title":"98Mo: A possible candidate for octupole collectivity in A ≈ 100 region","authors":"A. Karmakar , P. Datta , S.S. Nayak , Soumik Bhattacharya , Suchorita Paul , Snigdha Pal , S. Bhattacharyya , G. Mukherjee , S. Basu , S. Chakraborty , S. Panwar , Pankaj K. Giri , R. Raut , S.S. Ghugre , R. Palit , Sajad Ali , W. Shaikh , S. Chattopadhyay","doi":"10.1016/j.nuclphysa.2025.123265","DOIUrl":"10.1016/j.nuclphysa.2025.123265","url":null,"abstract":"<div><div>The high spin level structures of <span><math><msup><mrow></mrow><mn>98</mn></msup></math></span>Mo have been studied through discrete <span><math><mi>γ</mi></math></span>-ray spectroscopy. This study extends the existing band structures to higher spins and also shows two new E3 transitions. The spin and parity of most energy levels have been uniquely established from the present dataset. An extensive comparison with <span><math><mrow><msup><mrow></mrow><mn>100</mn></msup><mtext>Ru</mtext></mrow></math></span>, an octupole-deformed nucleus in the mass 100 region, reveals similarities that suggest the presence of octupole collectivity in <span><math><mrow><msup><mrow></mrow><mn>98</mn></msup><mtext>Mo</mtext></mrow></math></span>. This observation is relevant in establishing A <span><math><mo>≈</mo></math></span> 100 as another valley of octupole collectivity.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1066 ","pages":"Article 123265"},"PeriodicalIF":2.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145517833","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 : 2026-02-01Epub Date: 2025-10-29DOI: 10.1016/j.nuclphysa.2025.123270
P. Singh, S. Hinge, K. Churi, M. Hemalatha
The reduction in effective longevity of radiotoxic long-lived fission product (LLFP), Cs, that is produced as a natural consequence of the functioning of fission reactors by nuclear transmutation using proton-induced reactions, is discussed. The cross-section and effective half-life for the reaction-induced transmutation of Cs are calculated. The cross-sections for Cs isotopes present in the spent fuel are also calculated. The calculations for total and reaction cross-sections have been carried out in the Hauser–Feshbach statistical model framework incorporated in the latest version of TALYS-2.0 code. The formation cross-section of the compound nucleus is explained using the nuclear optical models, Koning–Delaroche (KD) and Jeukenne–Lejeune–Mahaux–Bruyères (JLMB), while for describing the decay probability, the back-shifted Fermi gas model (BFM), and the Hartree–Fock–Bogoliubov (HFB) nuclear level density, based on the Skyrme interactions from Goriely’s tables, have been used. The reaction cross-sections for LLFP Cs have been calculated using the same nuclear models as those of the stable Cs isotope for which data are available. The excitation function calculated using HFB level density for Cs(p,n)Ba shows a peak cross-section of 390 mb at about 10 MeV incident proton energy. Using a flux of protons s cm and HFB calculated cross-section, the effective half-life of transmutation of Cs is 45 , which is extremely less than its natural million-year half-life.
{"title":"Nuclear transmutation of the long-lived fission product, 135Cs using protons","authors":"P. Singh, S. Hinge, K. Churi, M. Hemalatha","doi":"10.1016/j.nuclphysa.2025.123270","DOIUrl":"10.1016/j.nuclphysa.2025.123270","url":null,"abstract":"<div><div>The reduction in effective longevity of radiotoxic long-lived fission product (LLFP), <span><math><msup><mrow></mrow><mn>135</mn></msup></math></span>Cs, that is produced as a natural consequence of the functioning of fission reactors by nuclear transmutation using proton-induced reactions, is discussed. The cross-section and effective half-life for the <span><math><mrow><mo>(</mo><mi>p</mi><mo>,</mo><mi>n</mi><mo>)</mo></mrow></math></span> reaction-induced transmutation of <span><math><msup><mrow></mrow><mn>135</mn></msup></math></span>Cs are calculated. The <span><math><mrow><mo>(</mo><mi>p</mi><mo>,</mo><mi>n</mi><mo>)</mo></mrow></math></span> cross-sections for <span><math><msup><mrow></mrow><mrow><mn>133</mn><mo>,</mo><mn>134</mn><mo>,</mo><mn>137</mn></mrow></msup></math></span>Cs isotopes present in the spent fuel are also calculated. The calculations for total and <span><math><mrow><mo>(</mo><mi>p</mi><mo>,</mo><mi>n</mi><mo>)</mo></mrow></math></span> reaction cross-sections have been carried out in the Hauser–Feshbach statistical model framework incorporated in the latest version of TALYS-2.0 code. The formation cross-section of the compound nucleus is explained using the nuclear optical models, Koning–Delaroche (KD) and Jeukenne–Lejeune–Mahaux–Bruyères (JLMB), while for describing the decay probability, the back-shifted Fermi gas model (BFM), and the Hartree–Fock–Bogoliubov (HFB) nuclear level density, based on the Skyrme interactions from Goriely’s tables, have been used. The <span><math><mrow><mo>(</mo><mi>p</mi><mo>,</mo><mi>n</mi><mo>)</mo></mrow></math></span> reaction cross-sections for LLFP <span><math><msup><mrow></mrow><mn>135</mn></msup></math></span>Cs have been calculated using the same nuclear models as those of the stable <span><math><msup><mrow></mrow><mn>133</mn></msup></math></span>Cs isotope for which data are available. The excitation function calculated using HFB level density for <span><math><msup><mrow></mrow><mn>135</mn></msup></math></span>Cs(p,n)<span><math><msup><mrow></mrow><mn>135</mn></msup></math></span>Ba shows a peak cross-section of 390 mb at about 10 MeV incident proton energy. Using a flux of <span><math><mrow><mn>6.25</mn><mo>×</mo><msup><mn>10</mn><mn>14</mn></msup></mrow></math></span> protons s<span><math><msup><mrow></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span> cm<span><math><msup><mrow></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></math></span> and HFB calculated cross-section, the effective half-life of transmutation of <span><math><msup><mrow></mrow><mn>135</mn></msup></math></span>Cs is 45 <span><math><mi>y</mi></math></span>, which is extremely less than its natural million-year half-life.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1066 ","pages":"Article 123270"},"PeriodicalIF":2.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145468480","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 : 2026-02-01Epub Date: 2025-11-15DOI: 10.1016/j.nuclphysa.2025.123283
Halil Basaran , Gokhan Kocak , Murat Aygun
The fusion cross-sections of the 15C + 12C reaction are analyzed using the optical model at energies around the Coulomb barrier. For this objective, the present study consists of two parts. First, three different density distributions of the nucleus 15C are applied to produce the real potential of the double-folding model. Then, the fusion cross-sections are investigated using a one-dimensional potential barrier approximation at astrophysical energies with Morse-type and harmonic-oscillator potentials to make a comprehensive analysis. The theoretical results are in good agreement with the experimental data. We have concluded that the Gaussian-based density distributions are important tools for fusion cross-section calculations with neutron-rich nuclei.
{"title":"Effect of different density distributions and one-dimensional potential barrier for 15C + 12C fusion reactions at astrophysical energies","authors":"Halil Basaran , Gokhan Kocak , Murat Aygun","doi":"10.1016/j.nuclphysa.2025.123283","DOIUrl":"10.1016/j.nuclphysa.2025.123283","url":null,"abstract":"<div><div>The fusion cross-sections of the <sup>15</sup>C + <sup>12</sup>C reaction are analyzed using the optical model at energies around the Coulomb barrier. For this objective, the present study consists of two parts. First, three different density distributions of the nucleus <sup>15</sup>C are applied to produce the real potential of the double-folding model. Then, the fusion cross-sections are investigated using a one-dimensional potential barrier approximation at astrophysical energies with Morse-type and harmonic-oscillator potentials to make a comprehensive analysis. The theoretical results are in good agreement with the experimental data. We have concluded that the Gaussian-based density distributions are important tools for fusion cross-section calculations with neutron-rich nuclei.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1066 ","pages":"Article 123283"},"PeriodicalIF":2.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614996","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 : 2026-02-01Epub Date: 2025-10-24DOI: 10.1016/j.nuclphysa.2025.123267
Rajesh Maiti, Debarati Chatterjee
Recent studies based on the relativistic mean field (RMF) model found certain nuclear empirical parameters, in particular the nucleon effective mass, to be strongly correlated with observable properties of Neutron Stars (NSs), such as the frequencies of -mode oscillations. This shows the potential to constrain the values of effective mass from future observations of -modes. One of our primary goals of this work is to investigate whether such correlations are physical or an artifact of the underlying nuclear model. To test this, we perform a comparative study of the correlations between NS astrophysical observables and nuclear physics parameters using two different equation of state models based on RMF theory and non-relativistic meta-modelling (MM) scheme. The nuclear meta-model does not assume any underlying nuclear model and therefore allows us to test the model dependence of the results. The calculations of the -mode characteristics are performed within the relativistic Cowling approximation. We use state-of-the-art nuclear microscopic calculations at low density and multi-messenger astrophysical data at high-density within a Bayesian-inspired scheme to constrain the parameter space of the nuclear models. From the posterior distribution, we probe the underlying correlations among nuclear parameters and with NS observables. We find that the correlation between the symmetry energy and its slope is physical, while that of the nucleon effective mass with NS observables is model-dependent. The study shows that the effective mass governs the high density behaviour in RMF models, while in the MM it is controlled by the higher order saturation parameters, and hence probes the possibility of constraining them from future -mode observations. The findings of this investigation are interesting both for astrophysics as well as nuclear physics communities.
{"title":"Investigating the role of nuclear parameters in neutron star oscillations: a model comparison","authors":"Rajesh Maiti, Debarati Chatterjee","doi":"10.1016/j.nuclphysa.2025.123267","DOIUrl":"10.1016/j.nuclphysa.2025.123267","url":null,"abstract":"<div><div>Recent studies based on the relativistic mean field (RMF) model found certain nuclear empirical parameters, in particular the nucleon effective mass, to be strongly correlated with observable properties of Neutron Stars (NSs), such as the frequencies of <span><math><mi>f</mi></math></span>-mode oscillations. This shows the potential to constrain the values of effective mass from future observations of <span><math><mi>f</mi></math></span>-modes. One of our primary goals of this work is to investigate whether such correlations are physical or an artifact of the underlying nuclear model. To test this, we perform a comparative study of the correlations between NS astrophysical observables and nuclear physics parameters using two different equation of state models based on RMF theory and non-relativistic meta-modelling (MM) scheme. The nuclear meta-model does not assume any underlying nuclear model and therefore allows us to test the model dependence of the results. The calculations of the <span><math><mi>f</mi></math></span>-mode characteristics are performed within the relativistic Cowling approximation. We use state-of-the-art nuclear microscopic calculations at low density and multi-messenger astrophysical data at high-density within a Bayesian-inspired scheme to constrain the parameter space of the nuclear models. From the posterior distribution, we probe the underlying correlations among nuclear parameters and with NS observables. We find that the correlation between the symmetry energy and its slope is physical, while that of the nucleon effective mass with NS observables is model-dependent. The study shows that the effective mass governs the high density behaviour in RMF models, while in the MM it is controlled by the higher order saturation parameters, and hence probes the possibility of constraining them from future <span><math><mi>f</mi></math></span>-mode observations. The findings of this investigation are interesting both for astrophysics as well as nuclear physics communities.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1066 ","pages":"Article 123267"},"PeriodicalIF":2.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145420288","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 : 2026-02-01Epub Date: 2025-10-28DOI: 10.1016/j.nuclphysa.2025.123269
Ruoxin Bai , Nicholas S. Manton
Building on the spatial wormhole geometry proposed by Manton and Dunajski, we develop a modified model for the Neon-20 nucleus that incorporates a repulsive Coulomb potential. This reduces the large threshold energy for cluster break-up in the original model and converts most bound states to resonances. We use generalized WKB methods to calculate the energies of bound states, and also the energies and widths of under-barrier and over-barrier resonances. The results align closely with experimental data for the , and rotational bands of Neon-20, including the large widths in the higher-nodal band.
{"title":"Coulomb-corrected wormhole model for Neon-20","authors":"Ruoxin Bai , Nicholas S. Manton","doi":"10.1016/j.nuclphysa.2025.123269","DOIUrl":"10.1016/j.nuclphysa.2025.123269","url":null,"abstract":"<div><div>Building on the spatial wormhole geometry proposed by Manton and Dunajski, we develop a modified model for the Neon-20 nucleus that incorporates a repulsive Coulomb potential. This reduces the large threshold energy for cluster break-up in the original model and converts most bound states to resonances. We use generalized WKB methods to calculate the energies of bound states, and also the energies and widths of under-barrier and over-barrier resonances. The results align closely with experimental data for the <span><math><msubsup><mn>0</mn><mrow><mn>1</mn></mrow><mo>+</mo></msubsup></math></span>, <span><math><msubsup><mn>0</mn><mn>1</mn><mo>−</mo></msubsup></math></span> and <span><math><msubsup><mn>0</mn><mrow><mn>4</mn></mrow><mo>+</mo></msubsup></math></span> rotational bands of Neon-20, including the large widths in the higher-nodal <span><math><msubsup><mn>0</mn><mrow><mn>4</mn></mrow><mo>+</mo></msubsup></math></span> band.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1066 ","pages":"Article 123269"},"PeriodicalIF":2.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145468564","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 : 2026-02-01Epub Date: 2025-11-10DOI: 10.1016/j.nuclphysa.2025.123272
M. Kamil , S. Triambak , G.C. Ball , V. Bildstein , C. Burbadge , A. Diaz Varela , T. Faestermann , P.E. Garrett , R. Hertenberger , K.G. Leach , F. Ghazi Moradi , N.J. Mukwevho , B.M. Rebeiro , M. Scheck , H.-F. Wirth
The 137Ba(3He, α) neutron removal reaction was used to investigate nuclear states in 136Ba, relevant for the neutrinoless double beta decay (0νββ) of 136Xe. Preliminary values of spectroscopic factors are reported. A quenching of the measured cross sections is observed, which appears to be consistent with previous results from (e, e′p) and other single-nucleon transfer reactions.
用137Ba（3He, α）中子去除反应研究了136Ba中与136Xe无中微子双β衰变（0νββ）有关的核态。报道了光谱因子的初步值。观察到测量截面的猝灭，这似乎与先前（e, e 'p）和其他单核子转移反应的结果一致。
{"title":"Spectroscopic investigation of states in 136Ba via the 137Ba(3He, α) reaction","authors":"M. Kamil , S. Triambak , G.C. Ball , V. Bildstein , C. Burbadge , A. Diaz Varela , T. Faestermann , P.E. Garrett , R. Hertenberger , K.G. Leach , F. Ghazi Moradi , N.J. Mukwevho , B.M. Rebeiro , M. Scheck , H.-F. Wirth","doi":"10.1016/j.nuclphysa.2025.123272","DOIUrl":"10.1016/j.nuclphysa.2025.123272","url":null,"abstract":"<div><div>The <sup>137</sup>Ba(<sup>3</sup>He, <em>α</em>) neutron removal reaction was used to investigate nuclear states in <sup>136</sup>Ba, relevant for the neutrinoless double beta decay (0<em>νββ</em>) of <sup>136</sup>Xe. Preliminary values of spectroscopic factors are reported. A quenching of the measured cross sections is observed, which appears to be consistent with previous results from (<em>e, e</em>′<em>p</em>) and other single-nucleon transfer reactions.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1066 ","pages":"Article 123272"},"PeriodicalIF":2.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145569570","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 : 2026-02-01Epub Date: 2025-11-19DOI: 10.1016/j.nuclphysa.2025.123285
Dharmendra Singh , Amritraj Mahato , Nitin Sharma , Rajesh K. Sahoo , Rahul Mahato , Lupteindu Chhura , Mohd. Usman , Rahbar Ali , M. Afzal Ansari , M. Ismail
Excitation functions for the 16O + 45Sc reaction were measured over 39.2-114.5 MeV, focusing on the production of medically important radioisotopes 57Co and 51Cr. 57Co (half-life: 271.8 days) is a γ-emitter widely used in medical imaging, and Mössbauer spectroscopy, while 51Cr (half-life: 27.7 days) is employed in blood volume and glomerular filtration rate assessment. In the present work, stacked foil technique was employed followed by offline γ-ray spectroscopy. The measured excitation functions for 57Co and 51Cr were compared with the predictions from the statistical model code PACE4. The experimental cross-sections of these radioisotopes were found to be significantly higher than the PACE4 predictions. These enhancements are attributed to the contribution of incomplete fusion processes which are not accounted in PACE4, highlighting an alternative pathway for radioisotope production via complete and incomplete fusion mechanisms at above barrier energies. While, the cross-section yields for both the radioisotopes were found to be high, the results indicate that the 16O+45Sc reaction is more suitable for 51Cr production due to its cleaner excitation function.
{"title":"Production of 57Co and 51Cr isotopes for medical application in the interaction of 16O projectile with 45Sc target","authors":"Dharmendra Singh , Amritraj Mahato , Nitin Sharma , Rajesh K. Sahoo , Rahul Mahato , Lupteindu Chhura , Mohd. Usman , Rahbar Ali , M. Afzal Ansari , M. Ismail","doi":"10.1016/j.nuclphysa.2025.123285","DOIUrl":"10.1016/j.nuclphysa.2025.123285","url":null,"abstract":"<div><div>Excitation functions for the <sup>16</sup>O + <sup>45</sup>Sc reaction were measured over 39.2-114.5 MeV, focusing on the production of medically important radioisotopes <sup>57</sup>Co and <sup>51</sup>Cr. <sup>57</sup>Co (half-life: 271.8 days) is a <em>γ</em>-emitter widely used in medical imaging, and Mössbauer spectroscopy, while <sup>51</sup>Cr (half-life: 27.7 days) is employed in blood volume and glomerular filtration rate assessment. In the present work, stacked foil technique was employed followed by offline <em>γ</em>-ray spectroscopy. The measured excitation functions for <sup>57</sup>Co and <sup>51</sup>Cr were compared with the predictions from the statistical model code PACE4. The experimental cross-sections of these radioisotopes were found to be significantly higher than the PACE4 predictions. These enhancements are attributed to the contribution of incomplete fusion processes which are not accounted in PACE4, highlighting an alternative pathway for radioisotope production via complete and incomplete fusion mechanisms at above barrier energies. While, the cross-section yields for both the radioisotopes were found to be high, the results indicate that the <sup>16</sup>O+<sup>45</sup>Sc reaction is more suitable for <sup>51</sup>Cr production due to its cleaner excitation function.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1066 ","pages":"Article 123285"},"PeriodicalIF":2.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145615021","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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