Nuclear Physics A最新文献_第10页

Controlling volume fluctuations for studies of critical phenomena in nuclear collisions 控制核碰撞临界现象研究中的体积波动

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2024-07-05 DOI: 10.1016/j.nuclphysa.2024.122924

Romain Holzmann , Volker Koch , Anar Rustamov , Joachim Stroth

{"title":"Controlling volume fluctuations for studies of critical phenomena in nuclear collisions","authors":"Romain Holzmann , Volker Koch , Anar Rustamov , Joachim Stroth","doi":"10.1016/j.nuclphysa.2024.122924","DOIUrl":"10.1016/j.nuclphysa.2024.122924","url":null,"abstract":"<div>We generalize and extend the recently proposed method [1] to account for contributions of system size (or volume/participant) fluctuations to the experimentally measured moments of particle multiplicity distributions. We find that in the general case there are additional biases which are not directly accessible to experiment. These biases are, however, parametrically suppressed if the multiplicity of the particles of interest is small compared to the total charged-particle multiplicity, e.g., in the case of proton number fluctuations at top RHIC and LHC energies. They are also small if the multiplicity distribution of charged particles per wounded nucleon is close to the Poissonian limit, which is the case at low energy nuclear collisions, e.g., at GSI/SIS18. We further find that mixed events are not necessarily needed to extract the correction for volume fluctuations. We provide the formulas to correct pure and mixed cumulants of particle multiplicity distributions up to any order together with their associated biases.</div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1050 ","pages":"Article 122924"},"PeriodicalIF":1.7,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0375947424001064/pdfft?md5=75464da240cea8d98ad1769205fb2c83&pid=1-s2.0-S0375947424001064-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141949873","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

Exploring asymmetric fission in 180Hg⁎ compound nucleus using dynamical cluster-decay model 利用动力学簇衰变模型探索 180Hg⁎ 复合核中的不对称裂变

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2024-07-05 DOI: 10.1016/j.nuclphysa.2024.122926

Dalip Singh Verma, Pooja Chauhan, Vivek, Anjali Singh Pawar

{"title":"Exploring asymmetric fission in 180Hg⁎ compound nucleus using dynamical cluster-decay model","authors":"Dalip Singh Verma, Pooja Chauhan, Vivek, Anjali Singh Pawar","doi":"10.1016/j.nuclphysa.2024.122926","DOIUrl":"10.1016/j.nuclphysa.2024.122926","url":null,"abstract":"<div>The observed asymmetric fission of the 180Hg⁎ compound nucleus challenges conventional expectations of symmetric fission, which are attributed to the presence of shell closures at Z=40 (semi-magic) and N=50 (magic). To comprehend this novel phenomenon, the dynamical cluster-decay model has been employed. For the first time, this model incorporates the bulk and neutron-proton asymmetry coefficients of the nuclear shape-dependent mass excess formula which are tuned recently to the ground state mass excess data of AME2020 and/or FRDM(2012) along with the temperature dependence for the nuclear shape and the surface energy coefficient of the nuclear proximity potential. The calculations have considered nuclear shapes as both spherical and deformed (quadrupole), with and without temperature dependence for the quadrupole deformation. A new minimum appears in the symmetric mass region of the fragmentation potential for masses (80, 100), when the fragments are deformed and optimally oriented, at an energy lower than that obtained for masses (90, 90) where the fragments are assumed to be spherical or nearly spherical at higher temperatures. This new minimum seems equivalent to the appearance of a new shell gap with deformation and is responsible for the asymmetric fission of 180Hg⁎. The most probable fission channel and the transition from asymmetric to symmetric mass distribution at higher excitation energies are consistent with experiments for the current temperature dependence assigned to the quadrupole deformation parameter.</div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1050 ","pages":"Article 122926"},"PeriodicalIF":1.7,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141622521","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 strangeonium ϕ(2170) state in lepton-proton scattering and ultra-peripheral collisions 探测轻子-质子散射和超外围对撞中的奇异子ϕ(2170)态

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2024-07-02 DOI: 10.1016/j.nuclphysa.2024.122925

Yuhang Hou , Yuan Gao , Xiao-Yun Wang

{"title":"Probing strangeonium ϕ(2170) state in lepton-proton scattering and ultra-peripheral collisions","authors":"Yuhang Hou , Yuan Gao , Xiao-Yun Wang","doi":"10.1016/j.nuclphysa.2024.122925","DOIUrl":"10.1016/j.nuclphysa.2024.122925","url":null,"abstract":"<div>In this work, the production of <math><mi>γ</mi><mi>p</mi><mo>→</mo><mi>ϕ</mi><mo>(</mo><mn>2170</mn><mo>)</mo><mi>p</mi></math> is studied for the first time by using the two gluon exchange model and effective Pomeron exchange model under the assumption that ϕ(2170) is a conventional <math><mi>s</mi><mover><mrow><mi>s</mi></mrow><mrow><mo>¯</mo></mrow></mover></math> state. On the whole, the numerical results show that the total cross section of <math><mi>ϕ</mi><mo>(</mo><mn>2170</mn><mo>)</mo></math> through γp scattering can reach more than 70 nb at a center-of-mass energy of W=7 GeV. A comparison between the outcomes of the two models reveals subtle discrepancies. Moreover, base on the cross section of <math><mi>ϕ</mi><mo>(</mo><mn>2170</mn><mo>)</mo></math> photoproduction, we systematically analyzed the production of <math><mi>ϕ</mi><mo>(</mo><mn>2170</mn><mo>)</mo></math> at Ultra-Peripheral Collisions (UPCs) and Electron-Ion Colliders (EICs) by using the STARlight and eSTARlight program developed by Brookhaven National Laboratory (BNL). Accordingly, the cross section, event number and rapidity distribution of <math><mi>ϕ</mi><mo>(</mo><mn>2170</mn><mo>)</mo></math> through EICs and UPCs are predicted based on the accelerator experiments. These projections offer valuable theoretical insights for forthcoming experiments at EicC, EIC-US, RHIC, and LHC facilities.</div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1050 ","pages":"Article 122925"},"PeriodicalIF":1.7,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141629819","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

A quantal diffusion approach for multinucleon transfer in heavy-ion collisions 重离子碰撞中多核子转移的量子扩散方法

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2024-06-28 DOI: 10.1016/j.nuclphysa.2024.122916

A. Kayaalp , M. Arik , S.E. Ocal , O. Yilmaz , S. Ayik , A.S. Umar

引用次数: 0

Excitation functions for natAg(α,x) reactions with detailed covariance analysis 带有详细协方差分析的 natAg（α，x）反应激发函数

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2024-06-28 DOI: 10.1016/j.nuclphysa.2024.122917

Mahesh Choudhary , Namrata Singh , Mahima Upadhyay , Punit Dubey , Shweta Singh , Sriya Paul , Utkarsha Mishra , S. Dasgupta , J. Datta , A. Kumar

{"title":"Excitation functions for natAg(α,x) reactions with detailed covariance analysis","authors":"Mahesh Choudhary , Namrata Singh , Mahima Upadhyay , Punit Dubey , Shweta Singh , Sriya Paul , Utkarsha Mishra , S. Dasgupta , J. Datta , A. Kumar","doi":"10.1016/j.nuclphysa.2024.122917","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2024.122917","url":null,"abstract":"<div>Natural silver targets were irradiated using an alpha particle beam to measure the activation cross sections of radioisotopes within the energy range of 23–40 MeV. The newly obtained cross section data, compared with previous experimental results, underline the importance of this work in the context of nuclear reactions and medical applications. Alpha particle induced reaction with <math><msup><mrow></mrow><mrow><mi>n</mi><mi>a</mi><mi>t</mi></mrow></msup></math>Ag involved the production of radioisotopes such as 111In, 105Ag, <math><msup><mrow></mrow><mrow><mn>106</mn><mi>m</mi></mrow></msup></math>Ag. In this study, we focused on calculating correlation matrices for the <math><msup><mrow></mrow><mrow><mi>n</mi><mi>a</mi><mi>t</mi></mrow></msup></math>Ag(α,x) nuclear reactions. These matrices were generated by considering various interconnected variables, such as decay constants, particle number densities, γ-ray intensities and detector efficiencies for both monitor and sample nuclear reaction products.</div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1050 ","pages":"Article 122917"},"PeriodicalIF":1.7,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141541957","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

Corrigendum to “QCD parameters and SM-high precision from e+e−→ Hadrons: Updated” [Nucl. Phys. A 1046 (2024) 122873] 来自 e+e-→ Hadrons 的 QCD 参数和 SM 高精度：更新" [Nucl.

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2024-06-27 DOI: 10.1016/j.nuclphysa.2024.122915

Stephan Narison

引用次数: 0

A modified macroscopic-microscopic nuclear mass formula within considering isospin effect and continuum states 考虑等空间效应和连续态的修正宏观-微观核质量公式

IF 1.4 4区物理与天体物理

Nuclear Physics A Pub Date : 2024-06-07 DOI: 10.1016/j.nuclphysa.2024.122913

Hai Fei Zhang

{"title":"A modified macroscopic-microscopic nuclear mass formula within considering isospin effect and continuum states","authors":"Hai Fei Zhang","doi":"10.1016/j.nuclphysa.2024.122913","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2024.122913","url":null,"abstract":"<div>The coefficients of modified macroscopic-microscopic mass formula have been adjusted on 2267 experimental atomic masses extracted from the AME2012 atomic mass evaluation. Same as the Weizsäcker-Skyrme model the influence of the nuclear deformation on the macroscopic energy and the mirror nuclei constraint are also taken into account, and for the sake of the consistency of the model parameters between the macroscopic and the microscopic parts we approximate the isospin-dependent component of the macroscopic energy to the depth of the Woods-Saxon potential. Inspired by Kruppa prescription the continuum states are considered in the calculation of shell correction. Then the root-mean square (rms) deviation with respect to 2267 measured nuclear masses is 0.46 MeV. We predict the remaining 988 nuclei from the AME2012 with <math><mi>Z</mi><mo>,</mo><mi>N</mi><mo>></mo><mn>7</mn></math> for which the mass is still unknown or known with a higher uncertainty. In addition the α−decay energies of seven chains in the superheavy nuclei region with <math><mi>Z</mi><mo>=</mo><mn>117</mn><mo>,</mo><mn>118</mn></math> are evaluated.</div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1049 ","pages":"Article 122913"},"PeriodicalIF":1.4,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141323075","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

Study on the reaction channels in the 6Li+89Y system with multi-angular proton and deutron-γ coincidence analysis 利用多角质子和中子-γ巧合分析研究 6Li+89Y 系统中的反应通道

IF 1.4 4区物理与天体物理

Nuclear Physics A Pub Date : 2024-06-07 DOI: 10.1016/j.nuclphysa.2024.122914

M.L. Wang , G.X. Zhang , S.P. Hu , G.L. Zhang , H.Q. Zhang , H.B. Sun , D. Testov , P.R. John , J.J. Valiente-Dobón , A. Goasduff , M. Siciliano , F. Galtarossa , F. Recchia , D. Mengoni , D. Bazzacco

{"title":"Study on the reaction channels in the 6Li+89Y system with multi-angular proton and deutron-γ coincidence analysis","authors":"M.L. Wang , G.X. Zhang , S.P. Hu , G.L. Zhang , H.Q. Zhang , H.B. Sun , D. Testov , P.R. John , J.J. Valiente-Dobón , A. Goasduff , M. Siciliano , F. Galtarossa , F. Recchia , D. Mengoni , D. Bazzacco","doi":"10.1016/j.nuclphysa.2024.122914","DOIUrl":"10.1016/j.nuclphysa.2024.122914","url":null,"abstract":"<div>The 6Li+89Y experiment was conducted at the Legnaro National Laboratory in Italy to explore the influence of breakup and transfer reactions on the fusion process induced by the weakly bound projectiles. Due to the competition between neutron and proton evaporation, complete and incomplete fusion might produce identical residues, leading to the difficulties in identification of different reaction process. In this work, the High-Purity-Germanium (HPGe) detector array (GALILEO) was employed to measure γ rays, and the silicon detector array (EUCLIDES) was utilized to capture light charged particles. Exclusive measurements of prompt γ rays from residuals with various light charged particles at an energy near the Coulomb barrier are reported. In the <math><mi>p</mi><mo>−</mo><mi>γ</mi></math> coincident measurements, observed 91Nb, 92Nb, and 93Nb is considered from neutron evaporation channel in complete fusion reaction, and 90Y is generated through 1n stripping reaction. A two-step, breakup followed by fusion, in case of the capture of α is inferred to be the dominant mechanism to yield the 92Nb and 91Nb in the deutron coincident exclusive measurement.</div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1049 ","pages":"Article 122914"},"PeriodicalIF":1.4,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141398630","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

The Gamow and the Fermi Golden Rules 伽莫夫和费米黄金定律

IF 1.4 4区物理与天体物理

Nuclear Physics A Pub Date : 2024-05-31 DOI: 10.1016/j.nuclphysa.2024.122904

Rafael de la Madrid

引用次数: 0

Hamiltonian formalism for Bose excitations in a plasma with a non-Abelian interaction I: Plasmon – hard particle scattering 具有非阿贝尔相互作用的等离子体中玻色激元的哈密顿形式主义 I：等离子体-硬粒子散射

IF 1.4 4区物理与天体物理

Nuclear Physics A Pub Date : 2024-05-24 DOI: 10.1016/j.nuclphysa.2024.122903

Yu.A. Markov, M.A. Markova, N.Yu. Markov

{"title":"Hamiltonian formalism for Bose excitations in a plasma with a non-Abelian interaction I: Plasmon – hard particle scattering","authors":"Yu.A. Markov, M.A. Markova, N.Yu. Markov","doi":"10.1016/j.nuclphysa.2024.122903","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2024.122903","url":null,"abstract":"<div>Hamiltonian theory for collective longitudinally polarized gluon excitations (plasmons) interacting with classical high-energy test color-charged particle propagating through a high-temperature gluon plasma is developed. A generalization of the Lie-Poisson bracket to the case of a continuous medium involving bosonic normal field variable <math><msubsup><mrow><mi>a</mi></mrow><mrow><mspace></mspace><mi>k</mi></mrow><mrow><mphantom><mo>⁎</mo></mphantom><mi>a</mi></mrow></msubsup></math> and a non-Abelian color charge <math><msup><mrow><mi>Q</mi></mrow><mrow><mspace></mspace><mi>a</mi></mrow></msup></math> is performed and the corresponding Hamilton equations are presented. The canonical transformations including simultaneously both bosonic degrees of freedom of the soft collective excitations and degree of freedom of hard test particle connecting with its color charge in the hot gluon plasma are written out. A complete system of the canonicity conditions for these transformations is derived. The notion of the plasmon number density <math><msubsup><mrow><mi>N</mi></mrow><mrow><mspace></mspace><mi>k</mi></mrow><mrow><mspace></mspace><mi>a</mi><mspace></mspace><msubsup><mrow><mi>a</mi></mrow><mrow><mphantom><mn>1</mn></mphantom></mrow><mrow><mo>′</mo></mrow></msubsup></mrow></msubsup></math>, which is a nontrivial matrix in the color space, is introduced. An explicit form of the effective fourth-order Hamiltonian describing the elastic scattering of a plasmon off a hard color particle is found and the self-consistent system of Boltzmann-type kinetic equations taking into account the time evolution of the mean value of the color charge of the hard particle is obtained. On the basis of these equations, a model problem of the interaction of two infinitely narrow wave packets is considered. A system of nonlinear first-order ordinary differential equations defining the dynamics of the interaction of the colorless <math><msubsup><mrow><mi>N</mi></mrow><mrow><mi>k</mi></mrow><mrow><mspace></mspace><mi>l</mi></mrow></msubsup></math> and color <math><msubsup><mrow><mi>W</mi></mrow><mrow><mi>k</mi></mrow><mrow><mspace></mspace><mi>l</mi></mrow></msubsup></math> components of the plasmon number density is derived. The problem of determining the third- and fourth-order coefficient functions entering into the canonical transformations of the original bosonic variable <math><msubsup><mrow><mi>a</mi></mrow><mrow><mspace></mspace><mi>k</mi></mrow><mrow><mphantom><mo>⁎</mo></mphantom><mi>a</mi></mrow></msubsup></math> and color charge <math><msup><mrow><mi>Q</mi></mrow><mrow><mspace></mspace><mi>a</mi></mrow></msup></math> is discussed. With the help of the coefficient functions obtained, a complete effective amplitude of the elastic scattering of plasmon off hard test particle is written out.</div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1048 ","pages":"Article 122903"},"PeriodicalIF":1.4,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141243709","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