Pub Date : 2025-01-23DOI: 10.1016/j.nuclphysa.2025.123021
Teeba M. Talib , Fouad A. Majeed
The nuclear structure properties, including elastic and inelastic form factors, were investigated for 44Ca, 58Ni, 62Ni, and 64Zn using shell model calculations with the NushellX@MSU code. These nuclei belong to the FP-shell region, and the Skyrme effective interaction (Sk28, Sk35, Sk43) was employed alongside the GXPF1A and JUN45 effective interactions in the model space. The model space for 44Ca (2p3/2, 1f7/2, 1f5/2, 2p1/2), while JUN45 take the model space of (2p3/2, 1f5/2, 2p1/2, 1 g9/2). To refine the form factors calculations, the Tassie model was applied with appropriate proton and neutron effective charges, incorporating core-polarization (CP) effects. The calculated form factors were compared with experimental data and existing theoretical models. This study offers a comprehensive analysis of CP effects on form factors and demonstrates the reliability of the theoretical frameworks used.
{"title":"Study of the nuclear structure of some FP-shell nuclei with Skyrme effective interaction","authors":"Teeba M. Talib , Fouad A. Majeed","doi":"10.1016/j.nuclphysa.2025.123021","DOIUrl":"10.1016/j.nuclphysa.2025.123021","url":null,"abstract":"<div><div>The nuclear structure properties, including elastic and inelastic form factors, were investigated for <sup>44</sup>Ca, <sup>58</sup>Ni, <sup>62</sup>Ni, and <sup>64</sup>Zn using shell model calculations with the NushellX@MSU code. These nuclei belong to the FP-shell region, and the Skyrme effective interaction (Sk28, Sk35, Sk43) was employed alongside the GXPF1A and JUN45 effective interactions in the model space. The model space for <sup>44</sup>Ca (2p3/2, 1f7/2, 1f5/2, 2p1/2), while JUN45 take the model space of (2p3/2, 1f5/2, 2p1/2, 1 g9/2). To refine the form factors calculations, the Tassie model was applied with appropriate proton and neutron effective charges, incorporating core-polarization (CP) effects. The calculated form factors were compared with experimental data and existing theoretical models. This study offers a comprehensive analysis of CP effects on form factors and demonstrates the reliability of the theoretical frameworks used.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1056 ","pages":"Article 123021"},"PeriodicalIF":1.7,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143444268","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 : 2025-01-15DOI: 10.1016/j.nuclphysa.2025.123020
F.M. Rafiei, O.N. Ghodsi
This work examines the relation between the bulk incompressibility of nuclear matter, K, and the surface nucleon distribution during the reaction process. Taking into account Pauli exclusion corrections, the double-folding (DF) formalism with the different density-dependent M3Y forces is applied to the analysis of the symmetric reaction of 40Ca+40Ca. Changes in the surface density distributions of protons and neutrons are found to be strongly correlated with changes in the bulk incompressibility. The obtained results suggest that, in addition to the symmetry energy slope, the quantity of neutron skin thickness (NST) may have a correlation with K values when evaluated utilizing heavy ion reactions. This constraint is caused by the influence of the bulk nuclear matter incompressibility on the surface nucleon distribution during the fusion reaction.
{"title":"Investigation of the correlation between the distribution of surface nucleons and incompressibility of nuclear matter in the 40Ca+40Ca reaction","authors":"F.M. Rafiei, O.N. Ghodsi","doi":"10.1016/j.nuclphysa.2025.123020","DOIUrl":"10.1016/j.nuclphysa.2025.123020","url":null,"abstract":"<div><div>This work examines the relation between the bulk incompressibility of nuclear matter, <em>K</em>, and the surface nucleon distribution during the reaction process. Taking into account Pauli exclusion corrections, the double-folding (DF) formalism with the different density-dependent M3Y forces is applied to the analysis of the symmetric reaction of <sup>40</sup>Ca+<sup>40</sup>Ca. Changes in the surface density distributions of protons and neutrons are found to be strongly correlated with changes in the bulk incompressibility. The obtained results suggest that, in addition to the symmetry energy slope, the quantity of neutron skin thickness (NST) may have a correlation with <em>K</em> values when evaluated utilizing heavy ion reactions. This constraint is caused by the influence of the bulk nuclear matter incompressibility on the surface nucleon distribution during the fusion reaction.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1055 ","pages":"Article 123020"},"PeriodicalIF":1.7,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154197","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 : 2025-01-14DOI: 10.1016/j.nuclphysa.2025.123019
N. Susshma , R. Gowrishankar , S. Deepa , K. Vijay Sai , S. Chatterjee , A. Sharma , S.S. Ghugre , Shabir Dar , S. Das , S. Basu , S. Nandi , S. Bhattacharya , S.S. Nayak , G. Mukherjee , S. Bhattacharyya , R.P. Singh , G.H. Bhat , J.A. Sheikh , S. Jehangir , R. Raut
Two previously known bands in the excitation scheme of the 154Tb nucleus have been investigated for the multipolarity and the electric/magnetic nature of the intra- and inter-band transitions. The excited states of the nucleus were populated in an α-beam induced reaction and the γ-rays emitted therefrom were detected using an array of Compton suppressed HPGe clover detectors. The experimental findings are indicative of a shape evolution of the nucleus and development of strong triaxiality at higher spins. The multipolarities of the inter-band transitions brings forth the same. Total Routhian Surface (TRS) calculations and those in the framework of Triaxial Projected Shell Model (TPSM) have been carried out and the results corroborate the proposition on triaxiality.
{"title":"Shape transition and development of triaxiality in 154Tb","authors":"N. Susshma , R. Gowrishankar , S. Deepa , K. Vijay Sai , S. Chatterjee , A. Sharma , S.S. Ghugre , Shabir Dar , S. Das , S. Basu , S. Nandi , S. Bhattacharya , S.S. Nayak , G. Mukherjee , S. Bhattacharyya , R.P. Singh , G.H. Bhat , J.A. Sheikh , S. Jehangir , R. Raut","doi":"10.1016/j.nuclphysa.2025.123019","DOIUrl":"10.1016/j.nuclphysa.2025.123019","url":null,"abstract":"<div><div>Two previously known bands in the excitation scheme of the <sup>154</sup>Tb nucleus have been investigated for the multipolarity and the electric/magnetic nature of the intra- and inter-band transitions. The excited states of the nucleus were populated in an <em>α</em>-beam induced reaction and the <em>γ</em>-rays emitted therefrom were detected using an array of Compton suppressed HPGe clover detectors. The experimental findings are indicative of a shape evolution of the nucleus and development of strong triaxiality at higher spins. The multipolarities of the inter-band transitions brings forth the same. Total Routhian Surface (TRS) calculations and those in the framework of Triaxial Projected Shell Model (TPSM) have been carried out and the results corroborate the proposition on triaxiality.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1055 ","pages":"Article 123019"},"PeriodicalIF":1.7,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153591","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 : 2025-01-13DOI: 10.1016/j.nuclphysa.2025.123018
Cheryl Henkels , Emmanuel G. de Oliveira , Roman Pasechnik , Haimon Trebien
We study the coherent photoproduction of light vector mesons in Pb-Pb collisions in the framework of color dipole approach. We employ the Glauber–Gribov formalism supplemented by an effective suppression factor accounting for the gluon shadowing correction. We adjust the latter to reproduce the deep inelastic structure function (E665) and ρ meson photoproduction (ALICE) data. We achieve a good description of the available data points with at scale GeV2. In addition, employing this suppression factor, we present predictions for coherent , and photoproduction observables using the holographic vector meson wave functions.
{"title":"Coherent photoproduction of light vector mesons off nuclear targets in the dipole picture","authors":"Cheryl Henkels , Emmanuel G. de Oliveira , Roman Pasechnik , Haimon Trebien","doi":"10.1016/j.nuclphysa.2025.123018","DOIUrl":"10.1016/j.nuclphysa.2025.123018","url":null,"abstract":"<div><div>We study the coherent photoproduction of light vector mesons in Pb-Pb collisions in the framework of color dipole approach. We employ the Glauber–Gribov formalism supplemented by an effective suppression factor <span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>G</mi></mrow></msub></math></span> accounting for the gluon shadowing correction. We adjust the latter to reproduce the deep inelastic structure function <span><math><msub><mrow><mi>F</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> (E665) and <em>ρ</em> meson photoproduction (ALICE) data. We achieve a good description of the available data points with <span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>G</mi></mrow></msub><mo>=</mo><mn>0.85</mn></math></span> at scale <span><math><msubsup><mrow><mi>M</mi></mrow><mrow><mi>ρ</mi></mrow><mrow><mn>2</mn></mrow></msubsup><mo>/</mo><mn>4</mn><mo>=</mo><mn>0.15</mn></math></span> GeV<sup>2</sup>. In addition, employing this suppression factor, we present predictions for coherent <span><math><mi>ρ</mi><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></math></span>, <span><math><mi>ω</mi><mo>(</mo><mn>1</mn><mi>S</mi><mo>,</mo><mn>2</mn><mi>S</mi><mo>)</mo></math></span> and <span><math><mi>ϕ</mi><mo>(</mo><mn>1</mn><mi>S</mi><mo>,</mo><mn>2</mn><mi>S</mi><mo>)</mo></math></span> photoproduction observables using the holographic vector meson wave functions.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1055 ","pages":"Article 123018"},"PeriodicalIF":1.7,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153614","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 : 2025-01-09DOI: 10.1016/j.nuclphysa.2025.123017
Dalip Singh Verma, Pooja Chauhan, Vivek
The transition from asymmetric to symmetric fission in the 180Hg⁎ nucleus, formed in the 36Ar + 144Sm reaction, as a function of excitation energy and angular momentum has been investigated. Using the dynamical cluster-decay model, the fragmentation potential, preformation probability, and cross-sections have been analyzed for asymmetric (80, 100) and symmetric (90, 90) mass fission channels, considering both the optimum hot and cold orientations of the fragments, as well as the case of symmetric mass fission channel with fragments assumed to be spherical. The calculations reveal that deformed proton and neutron shell closures favour asymmetric fission at lower excitation energies, while a transition to symmetric fission occurs near 40 MeV of excitation energy due to changes in fragment deformation with excitation energy. These findings are consistent with the available experimental observations and theoretical predictions. The transition also occurs with increasing angular momentum, but only for optimum hot orientations.
{"title":"Asymmetric to symmetric fission transition in 180Hg⁎: Effects of excitation energy and angular momentum","authors":"Dalip Singh Verma, Pooja Chauhan, Vivek","doi":"10.1016/j.nuclphysa.2025.123017","DOIUrl":"10.1016/j.nuclphysa.2025.123017","url":null,"abstract":"<div><div>The transition from asymmetric to symmetric fission in the <sup>180</sup>Hg<sup>⁎</sup> nucleus, formed in the <sup>36</sup>Ar + <sup>144</sup>Sm reaction, as a function of excitation energy and angular momentum has been investigated. Using the dynamical cluster-decay model, the fragmentation potential, preformation probability, and cross-sections have been analyzed for asymmetric (80, 100) and symmetric (90, 90) mass fission channels, considering both the optimum hot and cold orientations of the fragments, as well as the case of symmetric mass fission channel with fragments assumed to be spherical. The calculations reveal that deformed proton and neutron shell closures favour asymmetric fission at lower excitation energies, while a transition to symmetric fission occurs near 40 MeV of excitation energy due to changes in fragment deformation with excitation energy. These findings are consistent with the available experimental observations and theoretical predictions. The transition also occurs with increasing angular momentum, but only for optimum hot orientations.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1055 ","pages":"Article 123017"},"PeriodicalIF":1.7,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154198","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 : 2025-01-08DOI: 10.1016/j.nuclphysa.2024.123011
Hadi Sobhani, Yan-An Luo
This paper investigates one of the most prominent models in nuclear physics, the Tamm-Dancoff approximation (TDA), for particle-hole excitations. We demonstrate how to incorporate one of the most challenging aspects of nuclear physics, the hardcore, into this model. Following an introduction to the concept and the corresponding mathematical tools, we examine the sample nuclei 16O and 40Ca. A portion of the excitation spectra of these nuclei is reproduced, and the octupole transition in these nuclei along with the TDA sum rule is investigated. The results are calculated and compared in both the well-known version and the new approach. In all cases, the new model exhibits better agreement with experimental data than the well-known model, which employed the harmonic oscillator basis.
{"title":"Implementing the hardcore concept in the mean field of the Tamm-Dancoff approximation","authors":"Hadi Sobhani, Yan-An Luo","doi":"10.1016/j.nuclphysa.2024.123011","DOIUrl":"10.1016/j.nuclphysa.2024.123011","url":null,"abstract":"<div><div>This paper investigates one of the most prominent models in nuclear physics, the Tamm-Dancoff approximation (TDA), for particle-hole excitations. We demonstrate how to incorporate one of the most challenging aspects of nuclear physics, the hardcore, into this model. Following an introduction to the concept and the corresponding mathematical tools, we examine the sample nuclei <sup>16</sup>O and <sup>40</sup>Ca. A portion of the excitation spectra of these nuclei is reproduced, and the octupole transition in these nuclei along with the TDA sum rule is investigated. The results are calculated and compared in both the well-known version and the new approach. In all cases, the new model exhibits better agreement with experimental data than the well-known model, which employed the harmonic oscillator basis.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1055 ","pages":"Article 123011"},"PeriodicalIF":1.7,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153569","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 : 2025-01-08DOI: 10.1016/j.nuclphysa.2025.123016
Pooja Chauhan , S. Sihotra , Renu Joshi , Dalip Singh Verma , R.P. Singh , R. Palit , D. Mehta
The study of possibility of antimagnetic rotation in 100Ru is studied on the basis of semiclassical particle-rotor model (SCM). In the high spin range 18+ to 28+, the dynamic moment of inertia falls within the typical range of antimagnetic rotation. The decrease in calculated transition probability B(E2) values with an increase in spin, and a sharp increase in the ratio of observed and calculated B(E2) values with spin shows the possible antimagnetic rotation character. Additionally, the calculated spin (ħ) versus frequency (MeV) plot of configuration ⊗ , which is comparable with experimental values supports the possibility of the AMR phenomenon in the positive parity band of 100Ru.
{"title":"Study of possible antimagnetic rotation in 100Ru","authors":"Pooja Chauhan , S. Sihotra , Renu Joshi , Dalip Singh Verma , R.P. Singh , R. Palit , D. Mehta","doi":"10.1016/j.nuclphysa.2025.123016","DOIUrl":"10.1016/j.nuclphysa.2025.123016","url":null,"abstract":"<div><div>The study of possibility of antimagnetic rotation in <sup>100</sup>Ru is studied on the basis of semiclassical particle-rotor model (SCM). In the high spin range 18<sup>+</sup> to 28<sup>+</sup>, the dynamic moment of inertia <span><math><msup><mrow><mo>ℑ</mo></mrow><mrow><mo>(</mo><mn>2</mn><mo>)</mo></mrow></msup></math></span> falls within the typical range of antimagnetic rotation. The decrease in calculated transition probability B(E2) values with an increase in spin, and a sharp increase in the ratio of observed <span><math><msup><mrow><mo>ℑ</mo></mrow><mrow><mo>(</mo><mn>2</mn><mo>)</mo></mrow></msup></math></span> and calculated B(E2) values with spin shows the possible antimagnetic rotation character. Additionally, the calculated spin (<em>ħ</em>) versus frequency (MeV) plot of configuration <span><math><mi>π</mi><msup><mrow><mo>(</mo><msub><mrow><mi>g</mi></mrow><mrow><mn>9</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>)</mo></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></math></span> ⊗ <span><math><mi>ν</mi><mo>[</mo><msubsup><mrow><mi>h</mi></mrow><mrow><mn>11</mn><mo>/</mo><mn>2</mn></mrow><mrow><mn>2</mn></mrow></msubsup><mspace></mspace><msup><mrow><mo>(</mo><msub><mrow><mi>g</mi></mrow><mrow><mn>7</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>)</mo></mrow><mrow><mn>2</mn></mrow></msup><mo>]</mo></math></span>, which is comparable with experimental values supports the possibility of the AMR phenomenon in the positive parity band of <sup>100</sup>Ru.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1055 ","pages":"Article 123016"},"PeriodicalIF":1.7,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153568","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 : 2025-01-07DOI: 10.1016/j.nuclphysa.2025.123015
A. Obaid, A.M. Khalaf, M. Kotb, H.A. Ghanem
In this article, we showed that even-even Dysprosium isotopic chain follows a specific trajectory of evolution that appear to be from U(5) to near O(6) vertex inside the symmetry triangle. The analysis was done using the Extended Consistent Q formalism (ECQF) of the interacting boson model, and catastrophe theory. We determined the Hamiltonian parameters using the method of orthogonal crossing contours for key observables. The Potential Energy Surfaces (PES's) for each isotope was also obtained using the intrinsic coherent state formalism. The path of evolution for the chain showed the same trend-line in both the symmetry triangle and the separatrix plane of catastrophe theory. We also showed that despite being located near the O(6) limit in the symmetry triangle, neutron-rich Dy isotopes still exhibit the behaviour of good axially symmetric rotors but with a reduced gamma rigidity, and this apparent location is due to the non linearity of scales for observables inside the symmetry triangle.
{"title":"The apparent U(5) to near O(6) shape evolution in even-even 152→162Dy inside the symmetry triangle","authors":"A. Obaid, A.M. Khalaf, M. Kotb, H.A. Ghanem","doi":"10.1016/j.nuclphysa.2025.123015","DOIUrl":"10.1016/j.nuclphysa.2025.123015","url":null,"abstract":"<div><div>In this article, we showed that even-even <span><math><mi>A</mi><mo>=</mo><mn>152</mn><mo>⟶</mo><mn>162</mn></math></span> Dysprosium isotopic chain follows a specific trajectory of evolution that appear to be from U(5) to near O(6) vertex inside the symmetry triangle. The analysis was done using the Extended Consistent Q formalism (ECQF) of the interacting boson model, and catastrophe theory. We determined the Hamiltonian parameters using the method of orthogonal crossing contours for key observables. The Potential Energy Surfaces (PES's) for each isotope was also obtained using the intrinsic coherent state formalism. The path of evolution for the chain showed the same trend-line in both the symmetry triangle and the separatrix plane of catastrophe theory. We also showed that despite being located near the O(6) limit in the symmetry triangle, neutron-rich Dy isotopes still exhibit the behaviour of good axially symmetric rotors but with a reduced gamma rigidity, and this apparent location is due to the non linearity of scales for observables inside the symmetry triangle.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1055 ","pages":"Article 123015"},"PeriodicalIF":1.7,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153590","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 : 2024-12-31DOI: 10.1016/j.nuclphysa.2024.123012
Daniel Gallimore, Jinfeng Liao
We study the charge and mass distributions within a nucleon and compute the associated squared radii based on a potential model approach. Different constituent quark configurations such as Δ, Y, and quark-diquark are considered and compared, with model parameters calibrated by experimental measurements of the proton and neutron charge radius. The results suggest that while the charge radius is dictated by quark dynamics, the mass radius is strongly influenced by nonperturbative QCD contributions to a nucleon's mass that are not sensitive to the constituent quarks. As a result, the mass radius could become substantially different from the charge radius. The obtained nucleon mass distributions of different configurations are further used for simulations of the initial conditions in heavy ion collisions. The computed eccentricities and are found to demonstrate a considerable sensitivity to the input nucleon profiles, especially to the mass radius in the peripheral region as well as for systems with fewer participants.
{"title":"A potential model study of the nucleon's charge and mass radius","authors":"Daniel Gallimore, Jinfeng Liao","doi":"10.1016/j.nuclphysa.2024.123012","DOIUrl":"10.1016/j.nuclphysa.2024.123012","url":null,"abstract":"<div><div>We study the charge and mass distributions within a nucleon and compute the associated squared radii based on a potential model approach. Different constituent quark configurations such as Δ, <em>Y</em>, and quark-diquark are considered and compared, with model parameters calibrated by experimental measurements of the proton and neutron charge radius. The results suggest that while the charge radius is dictated by quark dynamics, the mass radius is strongly influenced by nonperturbative QCD contributions to a nucleon's mass that are not sensitive to the constituent quarks. As a result, the mass radius could become substantially different from the charge radius. The obtained nucleon mass distributions of different configurations are further used for simulations of the initial conditions in heavy ion collisions. The computed eccentricities <span><math><msub><mrow><mi>ε</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> and <span><math><msub><mrow><mi>ε</mi></mrow><mrow><mn>3</mn></mrow></msub></math></span> are found to demonstrate a considerable sensitivity to the input nucleon profiles, especially to the mass radius in the peripheral region as well as for systems with fewer participants.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1055 ","pages":"Article 123012"},"PeriodicalIF":1.7,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153609","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 : 2024-12-30DOI: 10.1016/j.nuclphysa.2024.123013
Ahmed Hammad Amer , Zakaria M.M. Mahmoud , M.N. El-Hammamy
In this work, we use the energy density functional (EDF) to study α-clustering and α-scattering from 28Si. With the help of the convolution theorem, the α-cluster density distribution inside the 28Si nucleus is determined by minimizing EDF. The single and double folding models use the obtained cluster density to get α+28Si real part of the optical model potential. The α+24Mg cluster structure is used as an alternative cluster configuration for 28Si in order to create the real cluster folding potential and validate the EDF model. For the imaginary part, we use either the Woods-Saxon (WS) or square Woods-Saxon (WS2) forms. Furthermore, the WS2 phenomenological potential is used for comparison. Our analysis shows that the current α-cluster model successfully reproduces the experimental data from α+28Si elastic scattering, nearly identical to the cluster folding potential generated using the α+24Mg cluster structure. The models implemented did not yield successful results for all experimental data at energies below 50 MeV, which is consistent with previously proposed theoretical models and methods. Moreover, these models demonstrate considerable success at energies exceeding 100 MeV. Therefore, the EDF can be employed to study the ground-state α-cluster of the 28Si nucleus.
{"title":"Elastic scattering analysis of α+28Si using energy density functional","authors":"Ahmed Hammad Amer , Zakaria M.M. Mahmoud , M.N. El-Hammamy","doi":"10.1016/j.nuclphysa.2024.123013","DOIUrl":"10.1016/j.nuclphysa.2024.123013","url":null,"abstract":"<div><div>In this work, we use the energy density functional (EDF) to study <em>α</em>-clustering and <em>α</em>-scattering from <sup>28</sup>Si. With the help of the convolution theorem, the <em>α</em>-cluster density distribution inside the <sup>28</sup>Si nucleus is determined by minimizing EDF. The single and double folding models use the obtained cluster density to get <em>α</em>+<sup>28</sup>Si real part of the optical model potential. The <em>α</em>+<sup>24</sup>Mg cluster structure is used as an alternative cluster configuration for <sup>28</sup>Si in order to create the real cluster folding potential and validate the EDF model. For the imaginary part, we use either the Woods-Saxon (WS) or square Woods-Saxon (WS<sup>2</sup>) forms. Furthermore, the WS<sup>2</sup> phenomenological potential is used for comparison. Our analysis shows that the current <em>α</em>-cluster model successfully reproduces the experimental data from <em>α</em>+<sup>28</sup>Si elastic scattering, nearly identical to the cluster folding potential generated using the <em>α</em>+<sup>24</sup>Mg cluster structure. The models implemented did not yield successful results for all experimental data at energies below 50 MeV, which is consistent with previously proposed theoretical models and methods. Moreover, these models demonstrate considerable success at energies exceeding 100 MeV. Therefore, the EDF can be employed to study the ground-state <em>α</em>-cluster of the <sup>28</sup>Si nucleus.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1055 ","pages":"Article 123013"},"PeriodicalIF":1.7,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153589","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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