Azimuthal anisotropy and multiplicities of hard photons and free nucleons in intermediate-energy heavy-ion collisions

被引：3

作者：

Wang, S. S. ^{[1
,2
,3
]}

Ma, Y. G. ^{[1
]}

Cao, X. G. ^{[4
]}

Fang, D. Q. ^{[1
]}

Ma, C. W. ^{[5
]}

机构：

[1] Fudan Univ, Inst Modern Phys, Key Lab Nucl Phys & Ion Beam Applicat MOE, Shanghai 200433, Peoples R China

[2] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[4] Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai 201210, Peoples R China

[5] Henan Normal Univ, Inst Particle & Nucl Phys, Xinxiang 453007, Henan, Peoples R China

来源：

EUROPEAN PHYSICAL JOURNAL A | 2020年 / 56卷 / 10期

基金：

中国国家自然科学基金;

关键词：

IMPACT PARAMETER DEPENDENCE; QUANTUM MOLECULAR-DYNAMICS; GAMMA-RAY PRODUCTION; LIGHT PARTICLES; COLLECTIVE-FLOW; YIELD RATIOS; BREMSSTRAHLUNG; EQUATION; PROBE; DISTRIBUTIONS;

D O I：

10.1140/epja/s10050-020-00264-z

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Anisotropic flow can offer significant information of evolution dynamics in heavy-ion collisions. A systematic study of the directed flow v1 and elliptic flow v2 of hard photons and free nucleons is performed for 40Ca + 40Ca collisions in a framework of isospin-dependent quantum molecular dynamics (IQMD) model. The study firstly reveals that thermal photons emitted in intermediate-energy heavy-ion collisions have the behaviors of directed and elliptic flows. The interesting phenomena of incident energy dependence of v1 and v2 for thermal photons in central collisions also confirmed that it can be regarded as a good probe of evolution dynamics. Moreover, the multiplicities of hard photons and free nucleons and their correlation are also investigated. We find that direct photon emission is positively related to free nucleons emission, however, there exists an anti-correlation for thermal photons with free nucleons.

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页数：8

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