Nuclear Physics APub Date : 2024-12-06DOI: 10.1016/j.nuclphysa.2024.123005
Dhanpat Sharma, Suneel Kumar
{"title":"Probing the contribution of various mass fragments in the production of magnetic field during heavy ion collisions","authors":"Dhanpat Sharma, Suneel Kumar","doi":"10.1016/j.nuclphysa.2024.123005","DOIUrl":"10.1016/j.nuclphysa.2024.123005","url":null,"abstract":"<div><div>This research work delves into the contribution of different mass fragments in the generation of magnetic field during heavy ion collisions (HICs) in the intermediate energy regime. Isospin dependent quantum molecular dynamics (IQMD) framework has been employed as a primary tool for phase space along with minimum spanning tree with momentum cut (MSTP) algorithm for the clusterization process. In this study, temporal evolution of magnetic field due to various mass fragments and its correlation with the impact parameter have been visualized. Moreover, the influence of some significant observables, such as rapidity and transverse momentum on the production of magnetic field due to various mass fragments have been investigated to gain more insights.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1055 ","pages":"Article 123005"},"PeriodicalIF":1.7,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153612","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}
Nuclear Physics APub Date : 2024-12-03DOI: 10.1016/j.nuclphysa.2024.123004
Halim Büyükuslu
{"title":"Dispersive optical-model potential parameters for neutron scattering on 197Au up to 200 MeV","authors":"Halim Büyükuslu","doi":"10.1016/j.nuclphysa.2024.123004","DOIUrl":"10.1016/j.nuclphysa.2024.123004","url":null,"abstract":"<div><div>In this study, dispersive optical model (DOM) potential parameters were derived for the <sup>197</sup>Au target nucleus up to an incident neutron energy of 200 MeV. The procedure involved fitting the theoretical total cross sections <em>σ<sub>tot</sub></em> with the experimental ones and thereby determining the valid free potential parameters at the lowest value of <span><math><mrow><msup><mrow><mi>χ</mi></mrow><mn>2</mn></msup><mo>/</mo><mi>M</mi></mrow></math></span>. The contribution of compound nuclei mechanism at low energies was also incorporated in the calculations. The theoretical results obtained using the derived potential were compared to the experimental data for both the angular differential cross-section and the elastic cross-section. While there was a good agreement with the experimental values for the total cross section, a satisfactory agreement was achieved for the angular cross section. The obtained potential is useful for describing the n+<sup>197</sup>Au scattering system and its outputs over an extensive energy spectrum.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1055 ","pages":"Article 123004"},"PeriodicalIF":1.7,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153587","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}
Nuclear Physics APub Date : 2024-12-02DOI: 10.1016/j.nuclphysa.2024.122994
Iqbal Mohi Ud Din , Sameer Ahmad Mir , Nasir Ahmad Rather , Saeed Uddin , Rameez Ahmad Parra
{"title":"Collision Energy Dependence of Particle Ratios and Freeze-out Parameters in Ultra Relativistic Nucleus Nucleus Collisions","authors":"Iqbal Mohi Ud Din , Sameer Ahmad Mir , Nasir Ahmad Rather , Saeed Uddin , Rameez Ahmad Parra","doi":"10.1016/j.nuclphysa.2024.122994","DOIUrl":"10.1016/j.nuclphysa.2024.122994","url":null,"abstract":"<div><div>This work investigates the thermo-chemical freeze-out condition of the multi-component hot and dense hadron resonance gas (HRG) formed in the ultra-relativistic nucleus-nucleus collisions (URNNC). The van der Waals (VDW) type model used in the present analysis incorporates the repulsive as well as attractive interactions among the hadrons. The baryons (antibaryons) are treated as incompressible objects. Using this theoretical approach the values of the model freeze-out parameters of the system are extracted over a wide range of collision energy by analyzing experimental data on like-mass antibaryon to baryon ratios. The same set of parameters is found to explain the energy dependence of several other particle ratios quite satisfactorily. We find that the horn-like structures seen in the ratios of strange particles to pions as a function of the collision energy cannot be explained by the VDW-HRG model alone without considering the strangeness imbalance effect in the system. We have compared our freeze-out line with those obtained earlier. The correlation between the <span><math><mover><mrow><mi>p</mi></mrow><mrow><mo>¯</mo></mrow></mover><mo>/</mo><mi>p</mi></math></span> and <span><math><msup><mrow><mi>K</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>/</mo><msup><mrow><mi>K</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span> ratios is also examined.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1055 ","pages":"Article 122994"},"PeriodicalIF":1.7,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153613","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}
Nuclear Physics APub Date : 2024-12-02DOI: 10.1016/j.nuclphysa.2024.122993
Vladimir A. Petrov, Nikolai P. Tkachenko
{"title":"On supposed oscillations of differential cross sections in pp - scattering at s=13 TeV","authors":"Vladimir A. Petrov, Nikolai P. Tkachenko","doi":"10.1016/j.nuclphysa.2024.122993","DOIUrl":"10.1016/j.nuclphysa.2024.122993","url":null,"abstract":"<div><div>The question of possible existence of oscillations in the region of diffraction peak in <em>pp</em> - scattering at <span><math><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>13</mn></math></span> TeV is considered in detail. It is shown that, within available experimental data published by the TOTEM and ALFA/ATLAS, posing the question of searching for such a subtle effect looks premature.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1055 ","pages":"Article 122993"},"PeriodicalIF":1.7,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153585","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}
Nuclear Physics APub Date : 2024-11-26DOI: 10.1016/j.nuclphysa.2024.122992
M.K. Volkov , A.A. Pivovarov , K. Nurlan
{"title":"Description of the processes e+e− → π+π− and τ− → π−π0ντ in the NJL model with value of the vector coupling constant gρ = 6","authors":"M.K. Volkov , A.A. Pivovarov , K. Nurlan","doi":"10.1016/j.nuclphysa.2024.122992","DOIUrl":"10.1016/j.nuclphysa.2024.122992","url":null,"abstract":"<div><div>It is shown that the processes <span><math><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span> and <span><math><msup><mrow><mi>τ</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>τ</mi></mrow></msub></math></span> can be described in a unified approach in satisfactory agreement with experiment using the vector coupling constant <span><math><msub><mrow><mi>g</mi></mrow><mrow><mi>ρ</mi></mrow></msub><mo>=</mo><mn>6</mn></math></span>. In this case, in addition to quark loops, it is also necessary to take into account meson loops corresponding to the next order in <span><math><mn>1</mn><mo>/</mo><msub><mrow><mi>N</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>. These loops must be taken into account when describing the <span><math><mi>γ</mi><mo>(</mo><mi>W</mi><mo>)</mo><mo>→</mo><mi>ρ</mi></math></span> transition, as well as in interaction of mesons in the final state.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1054 ","pages":"Article 122992"},"PeriodicalIF":1.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746328","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}
Nuclear Physics APub Date : 2024-11-22DOI: 10.1016/j.nuclphysa.2024.122983
A. Roy , R. Kanungo , D. Prajapati , Y.K. Tanaka , S. Bagchi , H. Geissel , P. Doornenbal , W. Horiuchi , D.S. Ahn , H. Baba , K. Behr , F. Browne , S. Chen , M.L. Cortés , A. Estradé , N. Fukuda , M. Holl , K. Itahashi , N. Iwasa , W.G. Jiang , K. Yoshida
{"title":"Measurement of charge-changing cross section of neutron-rich nitrogen isotopes for determining their proton radii","authors":"A. Roy , R. Kanungo , D. Prajapati , Y.K. Tanaka , S. Bagchi , H. Geissel , P. Doornenbal , W. Horiuchi , D.S. Ahn , H. Baba , K. Behr , F. Browne , S. Chen , M.L. Cortés , A. Estradé , N. Fukuda , M. Holl , K. Itahashi , N. Iwasa , W.G. Jiang , K. Yoshida","doi":"10.1016/j.nuclphysa.2024.122983","DOIUrl":"10.1016/j.nuclphysa.2024.122983","url":null,"abstract":"<div><div>A systematic study of point proton radii along an isotopic chain provides insights into the impact of the extended neutron wavefunction on the protons. This work aims to measure the charge-changing cross section (<span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>c</mi><mi>c</mi></mrow></msub></math></span>) for neutron-rich <span><math><mmultiscripts><mrow><mtext>N</mtext></mrow><mprescripts></mprescripts><none></none><mrow><mn>23</mn></mrow></mmultiscripts></math></span>, marking the first determination of its point proton root mean square radius, as well as the <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>c</mi><mi>c</mi></mrow></msub></math></span> for <span><math><mmultiscripts><mrow><mtext>N</mtext></mrow><mprescripts></mprescripts><none></none><mrow><mn>21</mn><mo>,</mo><mn>22</mn></mrow></mmultiscripts></math></span> at beam energies around 250<em>A</em> MeV.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1054 ","pages":"Article 122983"},"PeriodicalIF":1.7,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721571","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}
Nuclear Physics APub Date : 2024-11-22DOI: 10.1016/j.nuclphysa.2024.122985
S. Kumar , S. Patra , A. Mhatre , A. Kumar , K. Ramachandran , R. Tripathi
{"title":"Mass resolved angular distribution of fission products in 12C+232Th reaction at sub-barrier energy","authors":"S. Kumar , S. Patra , A. Mhatre , A. Kumar , K. Ramachandran , R. Tripathi","doi":"10.1016/j.nuclphysa.2024.122985","DOIUrl":"10.1016/j.nuclphysa.2024.122985","url":null,"abstract":"<div><div>This article reports the study of mass resolved angular distribution of the fission products and the angular anisotropy in <sup>232</sup>Th(<sup>12</sup>C,f) reaction at sub-barrier energy to investigate the possible role of shell effects and non-compound nucleus fission. In literature, average anisotropy values reported earlier for this system at sub-barrier energy widely vary. The present study was carried out using the recoil catcher technique followed by off-line γ-ray spectrometry at 62.5 MeV beam energy. Angular anisotropies of fission products showed slight enhancement in the symmetric mass region. Significantly higher value of the experimental average anisotropy (1.46 ± 0.06) compared to that obtained by Statistical Saddle Point Model (SSPM) calculation indicated the possible role of shell effect and non-compound nucleus fission at the present beam energy. Consideration of shell effects resulted in an enhancement of the calculated anisotropy, though it was still slightly lower compared to the experimental value. The contribution from the non-compound nucleus fission was confirmed based of the deviation of the SSPM calculation in the symmetric mass region, where shell effects are not expected to be significant. In order to reproduce the error weighted average anisotropy (1.73 ± 0.18) for the symmetric mass region, the required value for the variance of <em>K</em>-distribution was much lower compared to the value obtained from the SSPM calculations. Presence of insignificant mass dependence of anisotropy suggests quasifission to be the dominant non-compound nucleus fission mechanism for the present system at the sub-barrier energy. This is consistent with the earlier studies [Mein <em>et al.</em>, Phys. Rev. C55 (1997) R995; Williams <em>et al.</em> Phys. Rev. C 88 (2013) 034611] attributing anomaly in the overall fission fragment angular distribution to the contribution from quasifission.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1054 ","pages":"Article 122985"},"PeriodicalIF":1.7,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746327","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}
Nuclear Physics APub Date : 2024-11-19DOI: 10.1016/j.nuclphysa.2024.122982
K. Folias, Ch.C. Moustakidis
{"title":"Quarkyonic equation of state with momentum-dependent interaction and neutron star structure","authors":"K. Folias, Ch.C. Moustakidis","doi":"10.1016/j.nuclphysa.2024.122982","DOIUrl":"10.1016/j.nuclphysa.2024.122982","url":null,"abstract":"<div><div>The structure and basic properties of dense nuclear matter still remain one of the open problems of Physics. In particular, the composition of the matter that composes neutron stars is under theoretical and experimental investigation. Among the theories that have been proposed, apart from the classical one where the composition is dominated by hadrons, the existence or coexistence of free quark matter is a dominant guess. An approach towards this solution is the phenomenological view according to which the existence of quarkyonic matter plays a dominant role in the construction of the equation of state (EOS). According to it the structure of the EOS is based on the existence of the quarkyonic particle which is a hybrid state of a particle that combines properties of hadronic and quark matter with a corresponding representation in momentum space. In this paper we propose a phenomenological model for quarkyonic matter, borrowed from corresponding applications in hadronic models, where the interaction in the quarkyonic matter depends not only on the position but also on the momentum of the quarkyonic particles. This consideration, as we demonstrate, can have a remarkable consequence on the shape of the EOS and thus on the properties of neutron stars, offering a sufficiently flexible model. Comparison with recent observational data can place constraints on the parameterization of the particular model and help improve its reliability.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1054 ","pages":"Article 122982"},"PeriodicalIF":1.7,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721570","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}
Nuclear Physics APub Date : 2024-11-15DOI: 10.1016/j.nuclphysa.2024.122979
D. Rochman , A. Koning , S. Goriely , S. Hilaire
{"title":"What to expect from microscopic nuclear modelling for keff calculations?","authors":"D. Rochman , A. Koning , S. Goriely , S. Hilaire","doi":"10.1016/j.nuclphysa.2024.122979","DOIUrl":"10.1016/j.nuclphysa.2024.122979","url":null,"abstract":"<div><div>Comparisons between predicted and benchmark k<sub>eff</sub> values from criticality-safety systems are often used as metrics to estimate the quality of evaluated nuclear data libraries. Relevant nuclear data for these critical systems generally come from a mixture of expert knowledge and phenomenological predictions. In the present work, we use solely microscopic nuclear modelling from TALYS to estimate actinides cross sections and angular distributions, and we compare the calculated MCNP k<sub>eff</sub> values for fast systems between the JEFF-3.3 evaluated library, phenomenological and microscopic modelling. The conclusion is that even if the evaluated library leads to the most adequate results, the microscopic nuclear modelling can reach very similar results for these integral quantities. It demonstrates the remarkable advances in the recent decades of microscopic nuclear reaction ingredients for applied integral observables.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1054 ","pages":"Article 122979"},"PeriodicalIF":1.7,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nuclear Physics APub Date : 2024-11-13DOI: 10.1016/j.nuclphysa.2024.122981
Adiba Shaikh , Ranjita K. Mohapatra , Saumen Datta
{"title":"QCD phase diagram and the finite volume fireball: A model study","authors":"Adiba Shaikh , Ranjita K. Mohapatra , Saumen Datta","doi":"10.1016/j.nuclphysa.2024.122981","DOIUrl":"10.1016/j.nuclphysa.2024.122981","url":null,"abstract":"<div><div>Experimental investigations of the phase diagram of strongly interacting matter involve collisions of heavy ions at ultrarelativistic velocities. The medium created in such a collision is often of dimensions a few fermi, in particular in the Beam Energy Scan experiments. An understanding of the effect of the finite volume and the boundary is important for connecting the experimental results to the phase diagram.</div><div>Using the Nambu Jona-Lasinio model, an effective theory for the chiral transition of quantum chromodynamics (QCD), we have studied the effect of the finite volume of the fireball on the transition line at finite temperature and density using the MIT boundary condition to mimic the condition that the system is deconfined inside. We studied the effect of the finite volume on the transition temperature and on number density and its susceptibilities. The volume effects should be considered when looking for signatures of the phase diagram in experiments.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1054 ","pages":"Article 122981"},"PeriodicalIF":1.7,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721667","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}