Determining the nuclear temperature dependence on source neutron-proton asymmetry in heavy-ion reactions at intermediate energy  

作　　者：曲国峰 黄宇 郑华 刘星泉 R.Wada 林炜平 黄美容 韩纪锋 任培培 杨振雷 张鑫 冷强钟 Guofeng Qu;Yu Huang;Hua Zheng;Xingquan Liu;R.Wada;Weiping Lin;Meirong Huang;Jifeng Han;Peipei Ren;Zhenlei Yang;Xin Zhang;Qiangzhong Leng(Key Laboratory of Radiation Physics and Technology of the Ministry of Education,Sichuan University,Chengdu 610064,China;Institute of Nuclear Science and Technology,Sichuan University,Chengdu 610064,China;School of Physics and Information Technology,Shaanxi Normal University,Xi'an 710119,China;Cyclotron Institute,Texas A&M University,College Station,Texas 77843,USA;College of Physics and Electronics information,Inner Mongolia University for Nationalities,Tongliao 028000,China;science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]Key Laboratory of Radiation Physics and Technology of the Ministry of Education,Sichuan University,Chengdu 610064,China [2]Institute of Nuclear Science and Technology,Sichuan University,Chengdu 610064,China [3]School of Physics and Information Technology,Shaanxi Normal University,Xi'an 710119,China [4]Cyclotron Institute,Texas A&M University,College Station,Texas 77843,USA [5]College of Physics and Electronics information,Inner Mongolia University for Nationalities,Tongliao 028000,China [6]Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610213,China

出　　处：《Chinese Physics C》2023年第5期152-159,共8页中国物理C（英文版）

基　　金：Supported by the National Natural Science Foundation of China(12275186,11705242,12175156,11805138,11905120);the Fundamental Research Funds For the Central Universities in China(YJ201954,YJ201820)。

摘　　要：In this article,we investigate the dependence of nuclear temperature on emitting source neutron-proton(N/Z)asymmetry with light charged particles(LCPs)and intermediate mass fragments(IMFs)generated from intermediate-velocity sources in thirteen reaction systems with different N/Z asymmetries,^(64)Zn on^(112)Sn,and^(70)Zn,^(64)Ni on^(112,124)Sn,^(58,64)Ni,^(197)Au,and^(232)Th at 40 MeV/nucleon.The apparent temperature values of LCPs and IMFs from different systems are deduced from the measured yields using two helium-related and eight carbon-related double isotope ratio thermometers,respectively.Then,the sequential decay effect on the experimental apparent temperature deduction with the double isotope ratio thermometers is quantitatively corrected explicitly with the aid of the quantum statistical model.The present treatment is an improvement compared to our previous studies in which an indirect method was adopted to qualitatively consider the sequential decay effect.A negligible N/Z asymmetry dependence of the real temperature after the correction is quantitatively addressed in heavy-ion reactions at the present intermediate energy,where a change of o.1 units in source N/Z asymmetry corresponds to an absolute change in temperature of an order of 0.03 to 0.29 MeV on average for LCPs and IMFs.This conclusion is in close agreement with that inferred qualitatively via the indirect method in our previous studies.

关 键 词：nuclear temperature N/Z asymmetry dependence Albergo thermometer sequential decay correction heavy-ion reactions at intermediate energy 

分 类 号：O571.6[理学—粒子物理与原子核物理]