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Hypernuclei as a laboratory to test hyperon–nucleon interactions

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Nuclear Science and Techniques 2023年第6期34卷 5-8页

作者： yu-gang ma Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan UniversityShanghai200438China

Directed flow(v_(1))of the hypernuclei ^(3)_(Λ)H and ^(4)_(Λ)H have been observed in mid-central Au+Au collisions at√^(s)NN=3 GeV at *** measurement opens up a new possibility for studying hyperon–nucleon(Y–N)interaction under finite *** addition,multi-strangeness hypernuclei provide a venue to probe hyperon–nucleon–nucleon(Y–N–N)and even hyperon–hyperon–nucleon(Y–Y–N)*** are important for making connection between nuclear collisions and the equation of state which governs the inner structure of compact stars.

关键词： nucleon addition equation

New type of double‑slit interference experiment at Fermi scale

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Nuclear Science and Techniques 2023年第1期34卷 175-177页

作者： yu‑gang ma Key Laboratory of Nuclear Physics and Ion‑beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan UniversityShanghai 200438China

A new approach that using polarized photon–gluon collisions reported by STAR Collaboration is used to do tomography of the ultrarelativistic *** collision can be treated as a double-slit experiment at Fermi scale and... 详细信息

关键词： Fermi double radius

α-clustering effect on flows of direct photons in heavy-ion collisions

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Nuclear Science and Techniques 2021年第6期32卷 122-132页

作者： Chen-Zhong Shi yu-gang ma Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China University of the Chinese Academy of Sciences Beijing 100080China

In this study,we reconstruct theγ-photon energy spectrum,which is in good agreement with the experimental data of ^(86)Kr+^(12)C at E/A=44 Me V within the framework of the modified EQMD *** directed and elliptic flows of free protons and direct photons were investigated by considering theα-clustering structure of ^(12)*** with free protons,direct photon flows provide clearer information about the early stage of a nuclear *** difference in the collective flows between different configurations of ^(12)C is observed in this *** indicates that the collective flows of direct photons are sensitive to the initial ***,theγbremsstrahlung process might be taken as an alternative probe to investigate theα-clustering structure in a light nucleus from heavy-ion collisions within the Fermienergy region.

关键词： Nuclear reaction Direct photon Collective flow α-clustering configuration

Measurements of momentum correlation and interaction parameters between antiprotons

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Nuclear Science and Techniques 2016年第6期27卷 67-73页

作者： Zheng-Qiao Zhang yu-gang ma Shanghai Institute of Applied Physics Chinese Academy ofSciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

The two-particle momentum correlation is influenced by the nuclear force between two particles,which has been intensively studied for nucleons and nuclei,but not much for antinucleons or *** this proceeding,we present our STAR measurements on momentum correlation function of antiproton-antiproton and proton-proton in Au+Au collisions at S_(NN)^(1/2)= 200 GeV at the Relativistic Heavy Ion *** nuclear force between two antiprotons is demonstrated,and the strong interaction parameters(the scattering length and the effective range) are *** measurement serves as an additional verification of CPT *** present information on the strong force in the antiproton-antiproton system provides a fundamental ingredient towards understanding the structure of more sophisticated antinuclei.

关键词：动量相关作用相互作用参数反质子测量重离子对撞机散射长度核力量金+金

Study of a background reconstruction method for the measurement of D-meson azimuthal angular correlations

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Nuclear Science and Techniques 2021年第6期32卷 63-69页

作者： Long ma Xin Dong Huan-Zhong Huang yu-gang ma Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan University200433 ShanghaiChina Nuclear Science Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA University of California Los AngelesCalifornia 90095USA

We studied experimental background reconstruction methods for the measurement of the D-D correlation using PYTHIA *** like-sign(LS)and side-band(SB)background methods,which are widely used in the experimental measurements of single D-meson production yields,were deployed for correlation *** was found that the LS method,which describes the combinatorial background of single D^(0) meson yields,fails to reproduce the correlated background in the D^(0)-D^(0) correlation measurement,while the SB background method yields a good description of the background for both single D^(0) yields and the correlated background of the D^(0)-D^(0) correlation *** further examined the validity of the correlation methods under different signal-to-background ratios,providing direct references for experimental measurements.

关键词： Heavy flavor Azimuthal correlation PYTHIA

Density fluctuations in intermediate-energy heavy-ion collisions

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Nuclear Science and Techniques 2022年第5期33卷 1-7页

作者： Cong Liu Xian-Gai Deng yu-gang ma Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan UniversityShanghai 200438China

Within the framework of the isospin-dependent quantum molecular dynamics model,we simulate^(129)Xe+^(119)Sn collisions in an incident energy range of 20 to 190MeV/nucleon and discuss the liquid-gas phase transition with density *** comparison,we also extract the effective Fisher parameter τ_(eff),multiplicity of intermediate-mass fragments(IMFs),and information *** is found that the Fisher parameter and maximum information entropy of collisions have peak values at E_(beam)=50-80 MeV/*** addition,the maximum multiplicity of IMFs has a plateau around 70 MeV/*** higher-order density moments in a larger central region of[-5,5]^(3) fm^(3) in the collision system,a maximum plateau also appears as function of beam energy at energies exceeding 70 MeV/*** observables,which are consistent with each other,indicate a liquid-gas phase transition around 70 MeV/nucleon for the^(129)Xe+^(119)Sn system.

关键词： Heavy-ioncollisions Liquid-gasphase transition IQMD Density moment Intermediatemass fragment Informationentropy Fisher-lawparameter

Investigation of the symmetry energy of nuclear matter using isospin-dependent quantum molecular dynamics

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Nuclear Science and Techniques 2020年第6期31卷 83-89页

作者： Hao yu De-Qing Fang yu-gang ma Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of the Chinese Academy of Sciences Beijing 100080China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China

Simulations of infinite nuclear matter at different densities,isospin asymmetries and temperatures are performed using the isospin-dependent quantum molecular dynamics(IQMD)model to study the equation of state and symmetry energy.A rigorous periodic boundary condition is used in the *** energies are extracted from the binding energies under different conditions and compared to the classical molecular dynamics(CMD)model using the same *** results show that both models can reproduce the experimental results for the symmetry energies at low densities,but IQMD is more appropriate than CMD for nuclear matter above the saturation *** indicates that IQMD may be a reliable model for the study of the properties of infinite nuclear matter.

关键词： Infinite nuclear matter Symmetry energy IQMD model

Electromagnetic field effects on nucleon transverse momentum for heavy ion collisions around 100 A MeV

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Nuclear Science and Techniques 2017年第12期28卷 255-261页

作者： Xian-Gai Deng yu-gang ma Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China ShanghaiTech University Shanghai 200031China

With taking electromagnetic field into account for the transport model of Boltzmann-Uehling-Uhlenbeck,electromagnetic effects are studied for ^(208)Pb +^(208)Pb collisions around 100A MeV. Electromagnetic field evolution during the collisions was estimated. It was found that the electric field has an obvious effect on the transverse momentum(p_T) spectra of nucleons during heavy ion collisions, and leads to different minimum position for the peak of p_T spectra of nucleons versus beam energy when the electric field is switched on. For the magnetic field, it affects the z-axis direction distributions of nucleons for central heavy ion collisions at lower energy.

关键词： Heavy ion collision Electromagnetic field Transverse momentum

Neutron skin and its effects in heavy-ion collisions

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Nuclear Science and Techniques 2024年第12期35卷 217-238页

作者： Meng‑Qi Ding De‑Qing Fang yu‑gang ma Key Laboratory of Nuclear Physics and Ion‑Beam Application(MOE) Institute of Modern PhysicsFudan University200433 ShanghaiChina Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan University200438 ShanghaiChina

Neutron skin is an exotic phenomenon that occurs in unstable *** this study,the various efects of the neutron skin on nuclear reactions and their relationship with the properties of nuclear structures are *** on numerous studies using theoretical models,strong correlations have been found between the neutron skin thickness and the neutron removal cross section,neutron/proton yield ratio,t∕3He yield ratio,neutron-proton momentum diference,isoscaling parameter,photon production,reaction cross sections for neutron-induced reactions,charge-changing cross-sectional diferences of mirror nuclei,astrophysical S-factor,and other quantities in nuclear reactions induced by neutron-rich ***,the relationships between the neutron skin thickness and certain properties of the nuclear structure,such asα-cluster formation,αdecay,nuclear surface,nuclear temperature,and proton radii diference of mirror nuclei,have also been ***,it has also been shown that the neutron skin plays a crucial role in relativistic heavy-ion ***,an unstable nucleus with a neutron skin can be generated by radioactive nuclear beam facilities,and the thickness of the neutron skin can be extracted by measuring the sensitive probes,which further helps impose stringent constraints on the equation of state of asymmetric nuclear matter and the properties of neutron stars.

关键词： Neutron skin Radioactive nuclear beam Equation of state of asymmetric nuclear matter