Feng, ZQ (reprint author), Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China.
; Feng, ZQ (reprint author), Chinese Acad Sci, Kavli Inst Theoret Phys, Beijing 100190, Peoples R China.
文章类型:
Article
英文摘要:
The neck dynamics in Fermi-energy heavy-ion collisions, to probe the nuclear symmetry energy in the domain of subsaturation densities, is investigated within an isospin-dependent transport model. The single and double ratios of neutrons to protons from free nucleons and light clusters (complex particles) in the isotopic reactions are analyzed systematically. Isospin effects of particles produced from the neck fragmentations are explored. It is found that the ratios of the energetic isospin particles strongly depend on the stiffness of the nuclear symmetry energy and the effects increase with softening of the symmetry energy, which would be a nice probe for extracting the symmetry energy below the normal density in experiments. A flat structure appears at the tail spectra from the double ratio distributions. The neutron to proton ratio of light intermediate-mass fragments with charge number Z <= 8 is related to the density dependence of the symmetry energy with less sensitivity in comparison to the isospin ratios of nucleons and light particles.
类目[WOS]:
Physics, Nuclear
关键词[WOS]:
GAS PHASE-TRANSITION
; HEAVY-ION COLLISIONS
; SYMMETRY ENERGY
; EMISSION
; DEPENDENCE
; NEUTRON
; PROTON
; PROBE
Major State Basic Research Development Program in China [2015CB856903]
; National Natural Science Foundation of China [11175218, U1332207]
; Youth Innovation Promotion Association of the Chinese Academy of Sciences
