Pub Date : 2026-03-01Epub Date: 2025-12-28DOI: 10.1016/j.nuclphysa.2025.123322
K. Prameela , S. Ramakrishna Reddy , Anjali Merin , K.V. Varsha , K.V. Jinu , Gonika , Alankar Singh , Rishabh Kumar , J. Gehlot , S. Nath , E. Prasad , A.M. Vinodkumar , P.V. Madhusudhana Rao , S. Appannababu
Fusion excitation function has been measured for the reaction 16O+138Ba around the Coulomb barrier energies using the recoil mass separator Heavy Ion Reaction Analyzer (HIRA). The fusion cross sections are strongly enhanced when compared to the predictions of the one dimensional barrier penetration model (1D-BPM) in the below barrier region. Fusion barrier distribution has been extracted from the experimental data to unveil the various channel couplings involved in the reaction. The measured fusion cross sections data and extracted barrier distribution have been analyzed with the coupled-channels (CC) calculations. These calculations indicate that the fusion excitation function has been reproduced quite well with the inclusion of one- and two-phonon vibrational states of the target nucleus. Whereas, one-phonon state alone was sufficient to reproduce the barrier distribution indicating that, coupling to the two-phonon state had no significant effect on the shape of the barrier distribution.
{"title":"Sub-barrier fusion dynamics in the reaction 16O+138Ba: Cross sections and barrier distribution studies","authors":"K. Prameela , S. Ramakrishna Reddy , Anjali Merin , K.V. Varsha , K.V. Jinu , Gonika , Alankar Singh , Rishabh Kumar , J. Gehlot , S. Nath , E. Prasad , A.M. Vinodkumar , P.V. Madhusudhana Rao , S. Appannababu","doi":"10.1016/j.nuclphysa.2025.123322","DOIUrl":"10.1016/j.nuclphysa.2025.123322","url":null,"abstract":"<div><div>Fusion excitation function has been measured for the reaction <sup>16</sup>O+<sup>138</sup>Ba around the Coulomb barrier energies using the recoil mass separator Heavy Ion Reaction Analyzer (HIRA). The fusion cross sections are strongly enhanced when compared to the predictions of the one dimensional barrier penetration model (1D-BPM) in the below barrier region. Fusion barrier distribution has been extracted from the experimental data to unveil the various channel couplings involved in the reaction. The measured fusion cross sections data and extracted barrier distribution have been analyzed with the coupled-channels (CC) calculations. These calculations indicate that the fusion excitation function has been reproduced quite well with the inclusion of one- and two-phonon vibrational states of the target nucleus. Whereas, one-phonon state alone was sufficient to reproduce the barrier distribution indicating that, coupling to the two-phonon state had no significant effect on the shape of the barrier distribution.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123322"},"PeriodicalIF":2.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145924724","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 : 2026-03-01Epub Date: 2025-12-04DOI: 10.1016/j.nuclphysa.2025.123306
Awad A Ibraheem , M.N. El-Hammamy , F. Algahatani , Rehab Yajzey , Sh. Hamada , A. Attia
This work investigates α-particle elastic scattering from nα-cluster nuclei (12C - 40Ca, n = 3–10) at 240 MeV, 386 MeV, with emphasis on refining the α-nucleus optical potential. The relative wave function of the alpha-cluster is used to derive cluster densities for constructing the High-Energy Approximation (HEA) and São Paulo (SPP) potentials. The excellent agreement between theoretical results and experimental data highlights the strength of these methods in describing α-nucleus interactions and underscores their relevance in nuclear reaction studies.
本文研究了nα-团簇核（12C - 40Ca, n = 3-10）在240 MeV， 386 MeV下α-粒子的弹性散射，重点研究了α-核光势的细化。利用α -簇的相对波函数推导出簇密度，用于构造高能近似（HEA）和圣保罗（SPP）势。理论结果和实验数据之间的良好一致性突出了这些方法在描述α-核相互作用方面的优势，并强调了它们在核反应研究中的相关性。
{"title":"Elastic scattering of α-particles from nα-cluster nuclei using the high-energy approximation and São Paulo potential","authors":"Awad A Ibraheem , M.N. El-Hammamy , F. Algahatani , Rehab Yajzey , Sh. Hamada , A. Attia","doi":"10.1016/j.nuclphysa.2025.123306","DOIUrl":"10.1016/j.nuclphysa.2025.123306","url":null,"abstract":"<div><div>This work investigates α-particle elastic scattering from nα-cluster nuclei (<sup>12</sup>C - <sup>40</sup>Ca, <em>n</em> = 3–10) at 240 MeV, 386 MeV, with emphasis on refining the α-nucleus optical potential. The relative wave function of the alpha-cluster is used to derive cluster densities for constructing the High-Energy Approximation (HEA) and São Paulo (SPP) potentials. The excellent agreement between theoretical results and experimental data highlights the strength of these methods in describing α-nucleus interactions and underscores their relevance in nuclear reaction studies.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123306"},"PeriodicalIF":2.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733858","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 : 2026-03-01Epub Date: 2025-11-20DOI: 10.1016/j.nuclphysa.2025.123288
Mudasir Ahmad, Amit Bindra
Quantum shape-phase transitions in medium and heavy mass nuclei remain key benchmarks for testing nuclear models. Building on recent machine learning (ML) studies [1–3], we introduce a hybrid framework that integrates empirical systematics, Interacting Boson Approximation (IBA-1), and Light Gradient Boosting Machine (LightGBM) predictions. A composite sensitivity parameter, S = ▾R4/2 × B(E2; 0⁺ → 2⁺) is proposed, coupling deformation dynamics with quadrupole collectivity. Applied to rare-earth nuclei (Z = 58–68, N = 84–102) Ȿ exhibits a sharp peak near N ∼ 90, providing a distinct indicator of the U(5)–SU(3) phase transition. LightGBM reproduces excitation energies and B(E2) values with high accuracy across 47 isotopes, while extrapolations identify 154Gd and 156Dy as critical-point candidates and highlight 156Nd, 150Gd and 152,168Dy as priority cases for measurement. The reliability of our approach is underscored by SHAP (Shapley additive explanation) analysis, which highlights the dominant role of the Casten factor and neutron number, thereby reinforcing the physical interpretability of the model. These findings establish Ȿ as a sensitive probe of shape evolution and demonstrate the promise of physics-guided ML–theory frameworks for informing future spectroscopic studies. Our methodology is inherently scalable and can be systematically extended across the nuclear chart to explore shape coexistence and shell evolution, offering a robust pathway for future ML–IBA studies in diverse structural regimes.
{"title":"Nuclear structure of medium and heavy mass nuclei: From collectivity trends to machine learning approaches","authors":"Mudasir Ahmad, Amit Bindra","doi":"10.1016/j.nuclphysa.2025.123288","DOIUrl":"10.1016/j.nuclphysa.2025.123288","url":null,"abstract":"<div><div>Quantum shape-phase transitions in medium and heavy mass nuclei remain key benchmarks for testing nuclear models. Building on recent machine learning (ML) studies [1–3], we introduce a hybrid framework that integrates empirical systematics, Interacting Boson Approximation (IBA-1), and Light Gradient Boosting Machine (LightGBM) predictions. A composite sensitivity parameter, <em>S</em> = ▾R<sub>4/2</sub> × <em>B</em>(E2; 0⁺ → 2⁺) is proposed, coupling deformation dynamics with quadrupole collectivity. Applied to rare-earth nuclei (<em>Z</em> = 58–68, <em>N</em> = 84–102) <em>Ȿ</em> exhibits a sharp peak near N ∼ 90, providing a distinct indicator of the U(5)–SU(3) phase transition. LightGBM reproduces excitation energies and B(E2) values with high accuracy across 47 isotopes, while extrapolations identify <sup>154</sup>Gd and <sup>156</sup>Dy as critical-point candidates and highlight <sup>156</sup>Nd, <sup>150</sup>Gd and <sup>152,168</sup>Dy as priority cases for measurement. The reliability of our approach is underscored by SHAP (Shapley additive explanation) analysis, which highlights the dominant role of the Casten factor and neutron number, thereby reinforcing the physical interpretability of the model. These findings establish <em>Ȿ</em> as a sensitive probe of shape evolution and demonstrate the promise of physics-guided ML–theory frameworks for informing future spectroscopic studies. Our methodology is inherently scalable and can be systematically extended across the nuclear chart to explore shape coexistence and shell evolution, offering a robust pathway for future ML–IBA studies in diverse structural regimes.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123288"},"PeriodicalIF":2.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145617195","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 : 2026-03-01Epub Date: 2025-11-29DOI: 10.1016/j.nuclphysa.2025.123302
N. Saneesh , A. Jhingan , K.S. Golda , Mohit Kumar , A.M. Vinodkumar , P. Sugathan
The fission fragment mass distribution and neutron multiplicity from the fission of 227Pa, produced through the complete fusion reaction 19F + 208Pb, were measured to study the influence of neutron emission on fission dynamics. The measurements were carried out in the excitation energy range of ≈ 30 - 60 MeV. The experimental data were analyzed within the framework of the semi-empirical GEF model to understand the evolution of mass distributions at different excitation energies and their dependence on particle emission. The calculations, which incorporate multi-chance fission, suggest that the observed enhancement in mass width at lower excitation energies (E* ≈ 32 MeV) arises from fragments shell effects, restored due to the sequential nature of fission. In contrast, no significant influence of microscopic effects is observed at higher excitation energies (E* ≈ 60 MeV). To further elucidate and compare the role of shell effects, GEF model calculations were also performed for a heavier actinide 250Cf in a similar energy range. These results indicate that the interplay between symmetric and asymmetric fission modes leads to the characteristic flat-top mass distribution seen in heavier actinides, unlike the shoulder-like structures observed in lighter actinides.
{"title":"Study of heavy-ion induced fission in actinide nuclei through fragment-neutron correlation measurements","authors":"N. Saneesh , A. Jhingan , K.S. Golda , Mohit Kumar , A.M. Vinodkumar , P. Sugathan","doi":"10.1016/j.nuclphysa.2025.123302","DOIUrl":"10.1016/j.nuclphysa.2025.123302","url":null,"abstract":"<div><div>The fission fragment mass distribution and neutron multiplicity from the fission of <sup>227</sup>Pa, produced through the complete fusion reaction <sup>19</sup>F + <sup>208</sup>Pb, were measured to study the influence of neutron emission on fission dynamics. The measurements were carried out in the excitation energy range of ≈ 30 - 60 MeV. The experimental data were analyzed within the framework of the semi-empirical GEF model to understand the evolution of mass distributions at different excitation energies and their dependence on particle emission. The calculations, which incorporate multi-chance fission, suggest that the observed enhancement in mass width at lower excitation energies (<em>E</em>* ≈ 32 MeV) arises from fragments shell effects, restored due to the sequential nature of fission. In contrast, no significant influence of microscopic effects is observed at higher excitation energies (<em>E</em>* ≈ 60 MeV). To further elucidate and compare the role of shell effects, GEF model calculations were also performed for a heavier actinide <sup>250</sup>Cf in a similar energy range. These results indicate that the interplay between symmetric and asymmetric fission modes leads to the characteristic flat-top mass distribution seen in heavier actinides, unlike the shoulder-like structures observed in lighter actinides.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123302"},"PeriodicalIF":2.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682167","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 : 2026-03-01Epub Date: 2025-12-24DOI: 10.1016/j.nuclphysa.2025.123317
L.V. Ndala , M.L. Lekala
The breakup dynamics of 6Li and 7Li projectiles on a 209Bi target have been investigated at various incident energies using the Continuum Discretized Coupled Channels (CDCC) method. Convergence of the angular distributions of the differential breakup cross sections is achieved with partial waves up to . The 6Li system shows strong angular dependence and pronounced effects of continuum-continuum couplings, especially at lower energies and backward angles, while the 7Li reaction exhibits weaker sensitivity to these couplings. The differences arise primarily from continuum and resonant structures and fragment-target interactions, rather than from the breakup thresholds.
{"title":"Dynamics of 6,7 Li breakups on heavy target mass","authors":"L.V. Ndala , M.L. Lekala","doi":"10.1016/j.nuclphysa.2025.123317","DOIUrl":"10.1016/j.nuclphysa.2025.123317","url":null,"abstract":"<div><div>The breakup dynamics of <sup>6</sup>Li and <sup>7</sup>Li projectiles on a <sup>209</sup>Bi target have been investigated at various incident energies using the Continuum Discretized Coupled Channels (CDCC) method. Convergence of the angular distributions of the differential breakup cross sections is achieved with partial waves up to <span><math><mrow><msub><mi>ℓ</mi><mrow><mi>max</mi></mrow></msub><mo>=</mo><mn>6</mn></mrow></math></span>. The <sup>6</sup>Li system shows strong angular dependence and pronounced effects of continuum-continuum couplings, especially at lower energies and backward angles, while the <sup>7</sup>Li reaction exhibits weaker sensitivity to these couplings. The differences arise primarily from continuum and resonant structures and fragment-target interactions, rather than from the breakup thresholds.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123317"},"PeriodicalIF":2.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145883369","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 : 2026-03-01Epub Date: 2025-11-18DOI: 10.1016/j.nuclphysa.2025.123284
S. Hinge, P. Singh, K. Churi, M. Hemalatha
The study presents calculated cross sections for proton-induced reactions on 180,182,183,184,186W isotopes for the production of 180,182,183,184,186Re using the TALYS-2.0 nuclear reaction code. The optical model potentials were calculated using Koning-Delaroche (KD) model for protons scattering from 180,182,183,184,186W isotopes. Using the potentials, the calculated differential elastic scattering and total reaction cross sections were compared with corresponding data where available and were found to be in good agreement. Further, the calculated (p,n) reaction cross sections were calculated using nuclear level densities from both the back-shifted Fermi gas model (BFM) and the microscopic Hartree-Fock-Bogoliubov (HFB) approaches. The calculated (p,n) reaction cross sections compare well with data and TENDL-2023 for 186Re for which data are available, while for the isotopes, 180,182,183Re, predictions have been made. In addition, production yields have been calculated for the medically relevant radionuclides, 184,186Re.
{"title":"Cross sections for 184,186Re radioisotopes for medical applications: A proton-induced approach","authors":"S. Hinge, P. Singh, K. Churi, M. Hemalatha","doi":"10.1016/j.nuclphysa.2025.123284","DOIUrl":"10.1016/j.nuclphysa.2025.123284","url":null,"abstract":"<div><div>The study presents calculated cross sections for proton-induced reactions on <sup>180,182,183,184,186</sup>W isotopes for the production of <sup>180,182,183,184,186</sup>Re using the TALYS-2.0 nuclear reaction code. The optical model potentials were calculated using Koning-Delaroche (KD) model for protons scattering from <sup>180,182,183,184,186</sup>W isotopes. Using the potentials, the calculated differential elastic scattering and total reaction cross sections were compared with corresponding data where available and were found to be in good agreement. Further, the calculated (p,n) reaction cross sections were calculated using nuclear level densities from both the back-shifted Fermi gas model (BFM) and the microscopic Hartree-Fock-Bogoliubov (HFB) approaches. The calculated (p,n) reaction cross sections compare well with data and TENDL-2023 for <sup>186</sup>Re for which data are available, while for the isotopes, <sup>180,182,183</sup>Re, predictions have been made. In addition, production yields have been calculated for the medically relevant radionuclides, <sup>184,186</sup>Re.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123284"},"PeriodicalIF":2.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145594482","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}
High-spin structures of odd-mass Sb isotopes are investigated using the Triaxial Projected Shell Model (TPSM), with deformation parameters extracted from constrained Covariant Density Functional Theory (CDFT) calculations. The band diagrams exhibit characteristic crossings between one- and three-quasiparticle (1-qp and 3-qp) configurations in the mid-spin region, which are explained through the evolution of 3-qp wavefunction amplitudes. These structural changes are reflected in alignment diagrams, signature splitting and transition probabilities. The study demonstrates the necessity of including multi-quasiparticle configurations in the model basis to accurately reproduce experimentally observed electromagnetic transition rates particularly in 113Sb. Angular momentum projections, evaluated across three intrinsic sectors, provide direct evidence for triaxiality in this isotope. Overall, this work offers new insights into the influence of triaxial deformation and quasiparticle dynamics on the rotational behavior of Sb nuclei near the Z = 50 shell closure.
{"title":"Insights into triaxial collectivity of odd-mass 111−119Sb isotopes","authors":"Aneeqa Basheer , Ritvik Gupta , Manvi Rajput , Suram Singh , G.H. Bhat , Pankaj Kumar , Arun Bharti , J.A. Sheikh","doi":"10.1016/j.nuclphysa.2025.123299","DOIUrl":"10.1016/j.nuclphysa.2025.123299","url":null,"abstract":"<div><div>High-spin structures of odd-mass <span><math><msup><mrow></mrow><mrow><mn>111</mn><mo>−</mo><mn>119</mn></mrow></msup></math></span>Sb isotopes are investigated using the Triaxial Projected Shell Model (TPSM), with deformation parameters extracted from constrained Covariant Density Functional Theory (CDFT) calculations. The band diagrams exhibit characteristic crossings between one- and three-quasiparticle (1-qp and 3-qp) configurations in the mid-spin region, which are explained through the evolution of 3-qp wavefunction amplitudes. These structural changes are reflected in alignment diagrams, signature splitting and transition probabilities. The study demonstrates the necessity of including multi-quasiparticle configurations in the model basis to accurately reproduce experimentally observed electromagnetic transition rates particularly in <sup>113</sup>Sb. Angular momentum projections, evaluated across three intrinsic sectors, provide direct evidence for triaxiality in this isotope. Overall, this work offers new insights into the influence of triaxial deformation and quasiparticle dynamics on the rotational behavior of Sb nuclei near the Z = 50 shell closure.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123299"},"PeriodicalIF":2.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733859","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 : 2026-03-01Epub Date: 2025-12-16DOI: 10.1016/j.nuclphysa.2025.123312
Mahima Upadhyay , Punit Dubey , Mahesh Choudhary , Namrata Singh , Shweta Singh , Sriya Paul , G. Mishra , G. Mohanto , Sukanya De , L.S. Danu , B. Lalremruata , Yu N. Kopatch , I.N. Ruskov , Ajay Kumar , R.G. Thomas , A. Kumar
The current study presents the cross-section measurement of 181Ta(n,γ)182Ta reaction at 1.37 ± 0.13, 2.06 ± 0.14, 2.56 ± 0.15, and 3.05 ± 0.17 MeV neutron energies utilizing offline γ-ray spectroscopy. The neutrons were generated through the 7Li(p,n)7Be reaction. The 115In(n,n’γ)115mIn reaction served as a monitor reaction. The present study provides detailed information on the propagation of uncertainty in the overall result. The required corrections for low energy background neutron and γ-ray coincidence summing effect have been made in the present measurement. The output is compared with the pre-existing cross-section data from the EXFOR database, evaluated data libraries and theoretical model predictions like level density models and γ-ray strength functions.
{"title":"Cross-section measurement of 181Ta(n,γ)182Ta with covariance analysis","authors":"Mahima Upadhyay , Punit Dubey , Mahesh Choudhary , Namrata Singh , Shweta Singh , Sriya Paul , G. Mishra , G. Mohanto , Sukanya De , L.S. Danu , B. Lalremruata , Yu N. Kopatch , I.N. Ruskov , Ajay Kumar , R.G. Thomas , A. Kumar","doi":"10.1016/j.nuclphysa.2025.123312","DOIUrl":"10.1016/j.nuclphysa.2025.123312","url":null,"abstract":"<div><div>The current study presents the cross-section measurement of <sup>181</sup>Ta(n,<em>γ</em>)<sup>182</sup>Ta reaction at 1.37 ± 0.13, 2.06 ± 0.14, 2.56 ± 0.15, and 3.05 ± 0.17 MeV neutron energies utilizing offline <em>γ</em>-ray spectroscopy. The neutrons were generated through the <sup>7</sup>Li(p,n)<sup>7</sup>Be reaction. The <sup>115</sup>In(n,n’<em>γ</em>)<sup>115<em>m</em></sup>In reaction served as a monitor reaction. The present study provides detailed information on the propagation of uncertainty in the overall result. The required corrections for low energy background neutron and <em>γ</em>-ray coincidence summing effect have been made in the present measurement. The output is compared with the pre-existing cross-section data from the EXFOR database, evaluated data libraries and theoretical model predictions like level density models and <em>γ</em>-ray strength functions.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123312"},"PeriodicalIF":2.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145840062","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 : 2026-03-01Epub Date: 2025-11-30DOI: 10.1016/j.nuclphysa.2025.123301
Sachin Kumar Singh , S.K. Tandel , Saket Suman , Harsh Kumar , M. Hemalatha , S. Hinge , P. Singh , S. Mestri , Madhu , Dhananjaya Sahoo , A.Y. Deo , P.K. Nayak , S. Mukhopadhyay , G. Mukherjee , S. Bhattacharyya , T. Bhattacharjee , S. Chakraborty , Soumik Bhattacharya , S.S. Nayak , S. Panwar , S.S. Ghugre
The structure of several Hf isotopes has been studied through their population in α-induced reactions using the INGA detector array. The Kπ = 6 band and the 0, 2 quadrupole and the 2 octupole vibrational structures in 176Hf have been extended with the inclusion of 13 new transitions. Half-lives of high-K states in various Hf isotopes have been measured. The branching ratios of γ rays in the rotational bands built on the K isomers have been determined and these have been used to infer their underlying nucleonic configurations. Calculations using the Ultimate Cranker code attest to the rigid, well-deformed prolate shapes of Hf isotopes and the resultant K symmetry.
{"title":"Configurations of high-K band structures in Hf isotopes","authors":"Sachin Kumar Singh , S.K. Tandel , Saket Suman , Harsh Kumar , M. Hemalatha , S. Hinge , P. Singh , S. Mestri , Madhu , Dhananjaya Sahoo , A.Y. Deo , P.K. Nayak , S. Mukhopadhyay , G. Mukherjee , S. Bhattacharyya , T. Bhattacharjee , S. Chakraborty , Soumik Bhattacharya , S.S. Nayak , S. Panwar , S.S. Ghugre","doi":"10.1016/j.nuclphysa.2025.123301","DOIUrl":"10.1016/j.nuclphysa.2025.123301","url":null,"abstract":"<div><div>The structure of several Hf isotopes has been studied through their population in <em>α</em>-induced reactions using the INGA detector array. The <em>K</em><sup><em>π</em></sup> = 6<span><math><msup><mrow></mrow><mo>+</mo></msup></math></span> band and the 0<span><math><msubsup><mrow></mrow><mrow><mn>2</mn></mrow><mo>+</mo></msubsup></math></span>, 2<span><math><msubsup><mrow></mrow><mrow><mn>2</mn></mrow><mo>+</mo></msubsup></math></span> quadrupole and the 2<span><math><msup><mrow></mrow><mo>−</mo></msup></math></span> octupole vibrational structures in <sup>176</sup>Hf have been extended with the inclusion of 13 new transitions. Half-lives of high-<em>K</em> states in various Hf isotopes have been measured. The branching ratios of <em>γ</em> rays in the rotational bands built on the <em>K</em> isomers have been determined and these have been used to infer their underlying nucleonic configurations. Calculations using the Ultimate Cranker code attest to the rigid, well-deformed prolate shapes of Hf isotopes and the resultant <em>K</em> symmetry.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123301"},"PeriodicalIF":2.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682169","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 : 2026-03-01Epub Date: 2025-11-27DOI: 10.1016/j.nuclphysa.2025.123289
B. Sidharth, M. Shareef
A systematic analysis of pre-scission neutron multiplicities are performed using a statistical model for the reactions 18O+150Sm, 19F+169Tm, 16O+194Pt, and 19F+209Bi populating the compound nuclei 168Yb, 188Pt, 210Rn, and 228U. This analysis incorporates Krammer’s fission width due to the dissipative drag in nuclear fission, shell corrections in fission barrier and level density, collective enhancement of level density in fission and particle emission widths. The present work demonstrates that a strong fission hindrance in terms of temperature-independent dissipation coefficient is essential to reproduce the experimental pre-scission neutrons for heavy-mass systems. A significant effect of CELD was observed on the neutron emission probability for nuclei which is spherical in its ground state.
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