Pub Date : 2025-12-01DOI: 10.1016/j.nuclphysa.2025.123286
Lakhyajit Sarma , K. Kalita , Harun Al Rashid , Amar Das , Nabendu K. Deb , M. Bhuyan , A. Jhingan , K.S. Golda , N. Saneesh , M. Kumar , P. Sugathan
Fission fragment mass distributions have been measured for the reaction 30Si + 176Yb at near-Coulomb barrier energies to investigate the onset of quasifission. The measured mass distributions exhibit a single-Gaussian profile, and the extracted variances have been compared with calculations based on the Statistical Saddle Point Model (SSPM). The experimentally observed mass variances are significantly larger than the values predicted by the fusion-fission model, indicating the presence of quasifission in the studied energy range.
{"title":"Fission of pre-actinide nucleus 206Po","authors":"Lakhyajit Sarma , K. Kalita , Harun Al Rashid , Amar Das , Nabendu K. Deb , M. Bhuyan , A. Jhingan , K.S. Golda , N. Saneesh , M. Kumar , P. Sugathan","doi":"10.1016/j.nuclphysa.2025.123286","DOIUrl":"10.1016/j.nuclphysa.2025.123286","url":null,"abstract":"<div><div>Fission fragment mass distributions have been measured for the reaction <sup>30</sup>Si + <sup>176</sup>Yb at near-Coulomb barrier energies to investigate the onset of quasifission. The measured mass distributions exhibit a single-Gaussian profile, and the extracted variances have been compared with calculations based on the Statistical Saddle Point Model (SSPM). The experimentally observed mass variances are significantly larger than the values predicted by the fusion-fission model, indicating the presence of quasifission in the studied energy range.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123286"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733857","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":"2025-12-01","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 : 2025-12-01DOI: 10.1016/j.nuclphysa.2025.123303
Arati Chavan , S. Rathi , K. Mahata , S.K. Pandit , V.V. Parkar , A. Shrivastava , K. Ramachandran , Sangeeta Dhuri , Satbir Kaur , Prasanna M , Vineet Kumar
Elastic scattering and inclusive α particle angular distributions were measured for 6Li+93Nb system at lab energies of 24.6 MeV and 34.7 MeV. Optical model analysis of the measured elastic scattering angular distributions were analysed to extract the reaction cross sections. The energy and angle integrated α particle cross sections were determined. The reaction cross sections and the α production cross sections from the present measurement are compared with the available experimental data for 6Li projectile on various targets, to study the systematic behaviour. Extracted reaction cross sections from the optical model fits and the measured inclusive α agree very well with the systematic behaviour of reaction cross section and inclusive α production cross sections (due to non-compound nuclear process), respectively.
{"title":"Elastic scattering and inclusive α angular distributions for 6Li+93Nb system around the Coulomb barrier","authors":"Arati Chavan , S. Rathi , K. Mahata , S.K. Pandit , V.V. Parkar , A. Shrivastava , K. Ramachandran , Sangeeta Dhuri , Satbir Kaur , Prasanna M , Vineet Kumar","doi":"10.1016/j.nuclphysa.2025.123303","DOIUrl":"10.1016/j.nuclphysa.2025.123303","url":null,"abstract":"<div><div>Elastic scattering and inclusive <em>α</em> particle angular distributions were measured for <sup>6</sup>Li+<sup>93</sup>Nb system at lab energies of 24.6 MeV and 34.7 MeV. Optical model analysis of the measured elastic scattering angular distributions were analysed to extract the reaction cross sections. The energy and angle integrated <em>α</em> particle cross sections were determined. The reaction cross sections and the <em>α</em> production cross sections from the present measurement are compared with the available experimental data for <sup>6</sup>Li projectile on various targets, to study the systematic behaviour. Extracted reaction cross sections from the optical model fits and the measured inclusive <em>α</em> agree very well with the systematic behaviour of reaction cross section and inclusive <em>α</em> production cross sections (due to non-compound nuclear process), respectively.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123303"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733860","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 : 2025-12-01DOI: 10.1016/j.nuclphysa.2025.123300
C. Bourrely , F. Buccella , W.C. Chang , D. Di Bari , P.H. Frampton , J.C. Peng
The recent accurate measurements of the scattering of electrons off of the mirror nuclei 3H and 3He show with small errors that the neutron to proton ratio , approaches a value larger than 1/4 for x → 1. We suggest a possible explanation for this experimental result by studying the consequences of the Pauli exclusion principle for the parton distribution when the ratio is described by quantum statistical mechanics description in terms of three parameters inspired by the quantum statistical approach.
{"title":"Possible explanation of F2n/F2p at large x using quantum statistical mechanics","authors":"C. Bourrely , F. Buccella , W.C. Chang , D. Di Bari , P.H. Frampton , J.C. Peng","doi":"10.1016/j.nuclphysa.2025.123300","DOIUrl":"10.1016/j.nuclphysa.2025.123300","url":null,"abstract":"<div><div>The recent accurate measurements of the scattering of electrons off of the mirror nuclei <sup>3</sup>H and <sup>3</sup>He show with small errors that the neutron to proton ratio <span><math><mrow><mi>r</mi><mrow><mo>(</mo><mi>x</mi><mo>)</mo></mrow><mo>=</mo><msubsup><mi>F</mi><mn>2</mn><mi>n</mi></msubsup><mrow><mo>(</mo><mi>x</mi><mo>)</mo></mrow><mo>/</mo><msubsup><mi>F</mi><mn>2</mn><mi>p</mi></msubsup><mrow><mo>(</mo><mi>x</mi><mo>)</mo></mrow></mrow></math></span>, approaches a value larger than 1/4 for <em>x</em> → 1. We suggest a possible explanation for this experimental result by studying the consequences of the Pauli exclusion principle for the parton distribution when the ratio is described by quantum statistical mechanics description in terms of three parameters inspired by the quantum statistical approach.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123300"},"PeriodicalIF":2.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733861","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 : 2025-11-30DOI: 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":"2025-11-30","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}
Complete and incomplete fusion (CF & ICF) residues have been measured using the online γ-ray spectroscopy method for the reaction induced by 12C and 13C with 51V target at a projectile energy of about 5 MeV/nucleon. Comparison of the measured excitation functions with those calculated using the CASCADE code based on the statistical model revealed the occurrence of ICF reactions in the formation of α-emission products. The results have been discussed in terms of the effect of the α-cluster structure of the projectile on ICF reactions by carrying out systematic comparison among the reactions with 13C and 12C projectiles with different targets. The experimental ICF fraction was deduced by subtracting the CF estimated from CASCADE. The ICF for the 13C projectile is not observed to be suppressed compared to 12C projectile as reported in earlier studies [1, 2] at Ec.m. ≈ 2.5Vb.
{"title":"Measurement of complete and incomplete fusion in 12,13C + 51V system at 5 MeV/A","authors":"Shital Thakur , H. Kumawat , V.V. Parkar , A.S. Bennal","doi":"10.1016/j.nuclphysa.2025.123290","DOIUrl":"10.1016/j.nuclphysa.2025.123290","url":null,"abstract":"<div><div>Complete and incomplete fusion (CF & ICF) residues have been measured using the online <em>γ</em>-ray spectroscopy method for the reaction induced by <sup>12</sup>C and <sup>13</sup>C with <sup>51</sup>V target at a projectile energy of about 5 MeV/nucleon. Comparison of the measured excitation functions with those calculated using the CASCADE code based on the statistical model revealed the occurrence of ICF reactions in the formation of <em>α</em>-emission products. The results have been discussed in terms of the effect of the <em>α</em>-cluster structure of the projectile on ICF reactions by carrying out systematic comparison among the reactions with <sup>13</sup>C and <sup>12</sup>C projectiles with different targets. The experimental ICF fraction was deduced by subtracting the CF estimated from CASCADE. The ICF for the <sup>13</sup>C projectile is not observed to be suppressed compared to <sup>12</sup>C projectile as reported in earlier studies [<span><span>1</span></span>, 2] at E<sub><em>c.m</em>.</sub> ≈ 2.5<em>V<sub>b</sub></em>.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123290"},"PeriodicalIF":2.5,"publicationDate":"2025-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682170","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 : 2025-11-29DOI: 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":"2025-11-29","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 : 2025-11-29DOI: 10.1016/j.nuclphysa.2025.123305
E. Guliyev , H. Quliyev , A.A. Kuliev , A. Jalili
The electric dipole responses of the even-even 146–156Sm nuclei were studied using translational and Galilean invariant (TGI-) quasi-particle random-phase approximation (QRPA), with the highly fragmented E1 strength being predicted. By comparing these calculations with experimental data for the photon absorption cross section σγ, it was shown that the QRPA model can reproduce the shape of the GDR quite well. The excitation energies, transition probabilities, and splitting behaviors of the PDR into K = 0 and K=±1 branches and other properties were also investigated further. Calculations on one-phonon wave functions confirmed that the dipole states below the particle threshold energy have characteristics that are different from those exhibited by the giant dipole resonance. Using this difference, we thereby determined the character of the experimentally observed dipole excitations around 10 MeV and showed that the PDR can reach the 10 MeV region. For the first time, PDR and GDR calculations were performed specifically for the 146Sm and 156Sm isotopes, providing new insights into their dipole response characteristics.
{"title":"Systematics of electric dipole excitations in rare-earth 146−156Sm nuclei","authors":"E. Guliyev , H. Quliyev , A.A. Kuliev , A. Jalili","doi":"10.1016/j.nuclphysa.2025.123305","DOIUrl":"10.1016/j.nuclphysa.2025.123305","url":null,"abstract":"<div><div>The electric dipole responses of the even-even <sup>146–156</sup>Sm nuclei were studied using translational and Galilean invariant (TGI-) quasi-particle random-phase approximation (QRPA), with the highly fragmented E1 strength being predicted. By comparing these calculations with experimental data for the photon absorption cross section σ<sub>γ</sub>, it was shown that the QRPA model can reproduce the shape of the GDR quite well. The excitation energies, transition probabilities, and splitting behaviors of the PDR into <em>K</em> = 0 and <em>K</em>=±1 branches and other properties were also investigated further. Calculations on one-phonon wave functions confirmed that the dipole states below the particle threshold energy have characteristics that are different from those exhibited by the giant dipole resonance. Using this difference, we thereby determined the character of the experimentally observed dipole excitations around 10 MeV and showed that the PDR can reach the 10 MeV region. For the first time, PDR and GDR calculations were performed specifically for the <sup>146</sup>Sm and <sup>156</sup>Sm isotopes, providing new insights into their dipole response characteristics.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123305"},"PeriodicalIF":2.5,"publicationDate":"2025-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682171","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 : 2025-11-27DOI: 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.
{"title":"Effect of collective enhancement of level density in the neutron emission from compound nuclei","authors":"B. Sidharth, M. Shareef","doi":"10.1016/j.nuclphysa.2025.123289","DOIUrl":"10.1016/j.nuclphysa.2025.123289","url":null,"abstract":"<div><div>A systematic analysis of pre-scission neutron multiplicities are performed using a statistical model for the reactions <sup>18</sup>O+<sup>150</sup>Sm, <sup>19</sup>F+<sup>169</sup>Tm, <sup>16</sup>O+<sup>194</sup>Pt, and <sup>19</sup>F+<sup>209</sup>Bi populating the compound nuclei <sup>168</sup>Yb, <sup>188</sup>Pt, <sup>210</sup>Rn, and <sup>228</sup>U. 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.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123289"},"PeriodicalIF":2.5,"publicationDate":"2025-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682322","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 : 2025-11-26DOI: 10.1016/j.nuclphysa.2025.123292
Brunilde Gnoffo , Sara Pirrone , Giuseppe Politi , Enrico De Filippo , Giuseppe Cardella , Elena Geraci , Concettina Maiolino , Nunzia Simona Martorana , Angelo Pagano , Emanuele Vincenzo Pagano , Massimo Papa , Fabio Risitano , Francesca Rizzo , Paolo Russotto , Marina Trimarchi , Cristina Zagami
The isospin dependence of temperatures is investigated in the reactions 78Kr+40Ca and 86Kr+48Ca at 10 AMeV. These reactions were studied in the context of the ISODEC experiment, performed at INFN-Laboratori Nazionali del Sud in Catania, by using the 4π multidetector CHIMERA. The results of the data analysis suggest that the temperature depends on the N/Z ratio. Different thermometric methods,as well as the slope and fluctuations thermometer with the alpha particles as probe and the double isotope yields ratio thermometer are used to extract the temperature of compound nucleus. Higher values of the temperature were observed for the neutron rich system compared to neutron poor one. This trend is confirmed by the comparison with the GEMINI++ statistical model.
研究了78Kr+40Ca和86Kr+48Ca在10 AMeV下的同位旋对温度的依赖性。这些反应在ISODEC实验的背景下进行了研究，在卡塔尼亚的infn - Nazionali del Sud实验室，使用4π多探测器CHIMERA。数据分析结果表明，温度与N/Z比有关。采用了不同的测温方法，以及以α粒子为探针的斜率波动温度计和双同位素产率比温度计来提取复合核的温度。富中子体系的温度高于贫中子体系。与GEMINI++统计模型的比较证实了这一趋势。
{"title":"Isospin dependence of the nuclear temperature in the reactions 78Kr+40Ca and 86Kr+48Ca at 10 AMeV","authors":"Brunilde Gnoffo , Sara Pirrone , Giuseppe Politi , Enrico De Filippo , Giuseppe Cardella , Elena Geraci , Concettina Maiolino , Nunzia Simona Martorana , Angelo Pagano , Emanuele Vincenzo Pagano , Massimo Papa , Fabio Risitano , Francesca Rizzo , Paolo Russotto , Marina Trimarchi , Cristina Zagami","doi":"10.1016/j.nuclphysa.2025.123292","DOIUrl":"10.1016/j.nuclphysa.2025.123292","url":null,"abstract":"<div><div>The isospin dependence of temperatures is investigated in the reactions <sup>78</sup>Kr+<sup>40</sup>Ca and <sup>86</sup>Kr+<sup>48</sup>Ca at 10 AMeV. These reactions were studied in the context of the ISODEC experiment, performed at INFN-Laboratori Nazionali del Sud in Catania, by using the 4<em>π</em> multidetector CHIMERA. The results of the data analysis suggest that the temperature depends on the N/Z ratio. Different thermometric methods,as well as the slope and fluctuations thermometer with the alpha particles as probe and the double isotope yields ratio thermometer are used to extract the temperature of compound nucleus. Higher values of the temperature were observed for the neutron rich system compared to neutron poor one. This trend is confirmed by the comparison with the GEMINI++ statistical model.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123292"},"PeriodicalIF":2.5,"publicationDate":"2025-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145786614","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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