Temperature of Heavy Fragments in Heavy-Ion Collisions

The heavy fragments in heavy-ion collisions are finally formed after the hot prefragments undergo sequential decay, of whom the temperature should be much lower than that of prefragments. Using the double ratio （DR） method, the isotopic thermometer （Tiso ） for heavy fragment is constructed using the...

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Published inCommunications in theoretical physics Vol. 59; no. 1; pp. 95 - 98
Main Author 马春旺 王闪闪 普洁 陈丽 杨杰 杨佳斌 郭美婷
Format Journal Article
LanguageEnglish
Published 2013
Subjects
Collisions
Construction
Decay
Direct reduction
Fragments
Isotopes
MeV
Theoretical physics
Thermometers
入射能量
反应体系
同位素温度计
测量数据
重型
重离子碰撞
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Summary:The heavy fragments in heavy-ion collisions are finally formed after the hot prefragments undergo sequential decay, of whom the temperature should be much lower than that of prefragments. Using the double ratio （DR） method, the isotopic thermometer （Tiso ） for heavy fragment is constructed using the yield of heavy isotopes. Tiso of heavy fragment is obtained by analyzing the measured data in the 1A GeV 124＇136Xe and 140A MeV 48Ca/64Ni reactions. Result shows that Tiso varies from 0.5 MeV to 10 MeV. But most Tiso is around 1 4- 0.5 MeV, which is much lower than temperature of light particles. Result also indicates that the difference between Tiso of heavy fragments in different reactions is very small, and ~o is independent on the size of the reaction system, the incident energy and the neutron-richness of the projectile.
Bibliography:MA Chun-Wang , WANG Shan-Shan , PU Jie , CHEN Li , YANG Jie , YANG Jia-Bin , and GUO Mei-Ting （ Department of Physics, Henan Normal University, Xinxiang 453007, China）
The heavy fragments in heavy-ion collisions are finally formed after the hot prefragments undergo sequential decay, of whom the temperature should be much lower than that of prefragments. Using the double ratio （DR） method, the isotopic thermometer （Tiso ） for heavy fragment is constructed using the yield of heavy isotopes. Tiso of heavy fragment is obtained by analyzing the measured data in the 1A GeV 124＇136Xe and 140A MeV 48Ca/64Ni reactions. Result shows that Tiso varies from 0.5 MeV to 10 MeV. But most Tiso is around 1 4- 0.5 MeV, which is much lower than temperature of light particles. Result also indicates that the difference between Tiso of heavy fragments in different reactions is very small, and ~o is independent on the size of the reaction system, the incident energy and the neutron-richness of the projectile.
temperature, double ratio method, heavy fragment
11-2592/O3
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0253-6102
DOI:10.1088/0253-6102/59/1/17