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Far-from-equilibrium attractors in kinetic theory for a mixture of quark and gluon fluids 夸克和胶子混合流体动力学理论中的非平衡吸引子
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2024-12-18 DOI: 10.1016/j.nuclphysa.2024.123008
Ferdinando Frascà , Andrea Beraudo , Michael Strickland
{"title":"Far-from-equilibrium attractors in kinetic theory for a mixture of quark and gluon fluids","authors":"Ferdinando Frascà ,&nbsp;Andrea Beraudo ,&nbsp;Michael Strickland","doi":"10.1016/j.nuclphysa.2024.123008","DOIUrl":"10.1016/j.nuclphysa.2024.123008","url":null,"abstract":"<div><div>We exactly solve an RTA-Boltzmann equation that describes the dynamics of coupled massless quark and gluon fluids undergoing transversally homogeneous longitudinal boost-invariant expansion. We include a fugacity parameter that allows quarks to be out of chemical equilibrium and we account for the different collision rates of quarks and gluons, which are related by Casimir scaling. Based on these assumptions, we numerically determine the evolution of a large set of moments of the quark and gluon distribution functions and reconstruct their entire distribution functions. We find that both late and early-time attractors exist for all moments of the distribution functions containing more than one power of the squared longitudinal momentum. These attractors emerge long before the system reaches the regime where hydrodynamic approximations apply. In addition, we discuss how the shear viscous corrections and entropy density of the fluid mixture evolve and consider the properties of their respective attractors. Finally, the entropy production is also investigated for different initial values of momentum anisotropy and quark abundance.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1055 ","pages":"Article 123008"},"PeriodicalIF":1.7,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154196","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}
引用次数: 0
Isospin effect on the liquid-gas phase transition for finite nuclei 有限核液气相变的同位旋效应
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2024-12-16 DOI: 10.1016/j.nuclphysa.2024.123009
S. Mallik
{"title":"Isospin effect on the liquid-gas phase transition for finite nuclei","authors":"S. Mallik","doi":"10.1016/j.nuclphysa.2024.123009","DOIUrl":"10.1016/j.nuclphysa.2024.123009","url":null,"abstract":"<div><div>The phenomenon of nuclear liquid–gas phase transition is a topic of contemporary interest. In heavy-ion collisions, there is no direct way of accessing the thermodynamic variables like pressure, density, free energy, entropy etc., and unambiguous detection of phase transition becomes difficult. A peak in the first order derivative of total multiplicity with respect to temperature (commonly abbreviated as the multiplicity derivative) has been established as a new experimentally accessible signature of the nuclear liquid-gas phase transition. In this work, the effect of isospin asymmetry in the fragmenting system, as well as the nuclear equation of state, on the multiplicity derivative and specific heat at constant volume is investigated within the framework of the Canonical Thermodynamical Model (CTM) with a semi-microscopic cluster functional.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1055 ","pages":"Article 123009"},"PeriodicalIF":1.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153611","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}
引用次数: 0
Lightly bound Skyrmions and light nuclei 轻束缚的Skyrmions和轻原子核
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2024-12-12 DOI: 10.1016/j.nuclphysa.2024.123007
Hossein Mehranfar, Mohammad Ali Jafarizadeh
{"title":"Lightly bound Skyrmions and light nuclei","authors":"Hossein Mehranfar,&nbsp;Mohammad Ali Jafarizadeh","doi":"10.1016/j.nuclphysa.2024.123007","DOIUrl":"10.1016/j.nuclphysa.2024.123007","url":null,"abstract":"<div><div>This paper investigates the lightly bound model as a variant of the Skyrme model, which includes an additional fourth-degree potential term. The study explores its application to light nuclei, <span><math><mn>1</mn><mo>≤</mo><mi>B</mi><mo>≤</mo><mn>8</mn></math></span>, using the rational map approximation. Even though the standard Skyrme model has demonstrated a great deal of usefulness in forecasting nuclear energies for specific nuclei, it continues to show inconsistencies with accurate experimental findings. Using this modified Skyrme model with an extra parameter, we achieve improved predictions of nuclear energies that better align with experimental data. By quantizing the model and fitting its parameters to the properties of the lithium-6 nucleus, we derive the static mass of Skyrmions that aligns more closely with the experimental values, along with the quantum energy contribution for both the ground and excited states of light nuclei, and the prediction of new states.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1055 ","pages":"Article 123007"},"PeriodicalIF":1.7,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154913","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}
引用次数: 0
New formula for charge change cross section of nucleus-nucleus interaction 核-核相互作用电荷变化截面的新公式
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2024-12-10 DOI: 10.1016/j.nuclphysa.2024.123006
I.A.M. Abdulmagead
{"title":"New formula for charge change cross section of nucleus-nucleus interaction","authors":"I.A.M. Abdulmagead","doi":"10.1016/j.nuclphysa.2024.123006","DOIUrl":"10.1016/j.nuclphysa.2024.123006","url":null,"abstract":"<div><div>By including the projectile neutron contribution, we developed a free parameter formula based on the Glauber model framework for nucleus-nucleus interaction to determine the total charge change cross section σ<sub>cc</sub>. The formula successfully reproduced the experimental data of reactions <sup>9</sup>Be + <sup>12</sup>C, <sup>16,17</sup>O + <sup>12</sup>C, <sup>27</sup>Al + <sup>12</sup>C, <sup>28</sup>Si + <sup>12</sup>C, <sup>40</sup>Ar + <sup>12</sup>C, <sup>56</sup>Fe + <sup>12</sup>C, and <sup>238</sup>U + <sup>27</sup>Al. Consequently, our study ensures that the charge change cross sections depend on the projectile's neutrons, as well as its protons.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1055 ","pages":"Article 123006"},"PeriodicalIF":1.7,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153588","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}
引用次数: 0
Probing the contribution of various mass fragments in the production of magnetic field during heavy ion collisions 探讨重离子碰撞过程中不同质量碎片对磁场产生的贡献
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2024-12-06 DOI: 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,&nbsp;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}
引用次数: 0
Dispersive optical-model potential parameters for neutron scattering on 197Au up to 200 MeV 197Au上高达200mev的中子散射色散光学模型电位参数
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2024-12-03 DOI: 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}
引用次数: 0
Collision Energy Dependence of Particle Ratios and Freeze-out Parameters in Ultra Relativistic Nucleus Nucleus Collisions 超相对论核碰撞中粒子比和冻结参数对碰撞能量的依赖
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2024-12-02 DOI: 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 ,&nbsp;Sameer Ahmad Mir ,&nbsp;Nasir Ahmad Rather ,&nbsp;Saeed Uddin ,&nbsp;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}
引用次数: 0
On supposed oscillations of differential cross sections in pp - scattering at s=13 TeV s=13 TeV时pp -散射微分截面的假设振荡
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2024-12-02 DOI: 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,&nbsp;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}
引用次数: 0
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 以矢量耦合常数gρ = 为值的NJL模型中e+e− → π+π−和τ− → π−π0ντ过程的描述
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2024-11-26 DOI: 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 ,&nbsp;A.A. Pivovarov ,&nbsp;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}
引用次数: 0
Measurement of charge-changing cross section of neutron-rich nitrogen isotopes for determining their proton radii 测量富中子氮同位素的电荷变化截面以确定其质子半径
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2024-11-22 DOI: 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 ,&nbsp;R. Kanungo ,&nbsp;D. Prajapati ,&nbsp;Y.K. Tanaka ,&nbsp;S. Bagchi ,&nbsp;H. Geissel ,&nbsp;P. Doornenbal ,&nbsp;W. Horiuchi ,&nbsp;D.S. Ahn ,&nbsp;H. Baba ,&nbsp;K. Behr ,&nbsp;F. Browne ,&nbsp;S. Chen ,&nbsp;M.L. Cortés ,&nbsp;A. Estradé ,&nbsp;N. Fukuda ,&nbsp;M. Holl ,&nbsp;K. Itahashi ,&nbsp;N. Iwasa ,&nbsp;W.G. Jiang ,&nbsp;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}
引用次数: 0
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