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12C+13C在库仑位垒以下能区的熔合截面测量
引用本文:陈治均,张宁涛,李奇特,任晓堂,唐晓东,王新雨,许金艳,许世伟.12C+13C在库仑位垒以下能区的熔合截面测量[J].原子核物理评论,2017,34(4):705-709.
作者姓名:陈治均  张宁涛  李奇特  任晓堂  唐晓东  王新雨  许金艳  许世伟
作者单位:1.中国科学院近代物理研究所, 兰州 73000;
基金项目:国家自然科学基金资助项目(11475228,11405226);中国科学院百人计划资助项目(Y411010BR0)
摘    要:深垒下能区的12C+13C熔合截面测量对检验天体中熔合反应外推模型具有很重要的意义。目前在库仑位垒以下能区存在的各种测量结果,都利用了统计模型来修正得到熔合截面,但对于这些方法间的系统误差仍没有很好地研究。实验采用离线活度测量的方法,在Ec.m.=4.4~5.8 MeV能区内对12C+13C熔合截面进行测量。经Hauser-Feshbach统计模型对分支比的修正后,熔合总截面由24Na活度推导出。通过本实验数据与其它实验方法获得的数据进行比较,确定了统计模型的系统误差为14%。The study of fusion reactions of 12C+13C at the deep sub-barrier energies is very important for the test of predictive power of the extrapolation models for nuclear reactions for astrophysics. Until now, all the measurements below Coulomb barrier energies have to use the statistical model calculations to estimate the branching ratios to deduce the total fusion cross sections. However, the systematic uncertainty induced by the calculated corrections has not been studied well. In this experiment, the fusion cross sections of 12C+13C have been measured using an offline activity measurement in the range of Ec.m.=4.4 to 5.8 MeV. The total fusion cross sections have been deduced from the 24Na activities after correcting the branching ratios estimated with the Hauser-Feshbach statistical model. Through the comparison between our result and other data obtained with other methods, the systematic uncertainty of statistical model has been determined to be 14%.

关 键 词:12C+13C垒下熔合    统计模型    系统误差
收稿时间:2017-05-04

Measurement of 12C+13C Fusion Cross Sections Below Coulomb Barrier Energies
CHEN Zhijun,ZHANG Ningtao,LI Qite,REN Xiaotang,TANG Xiaodong,WANG Xinyu,XU Jinyan,XU Shiwei.Measurement of 12C+13C Fusion Cross Sections Below Coulomb Barrier Energies[J].Nuclear Physics Review,2017,34(4):705-709.
Authors:CHEN Zhijun  ZHANG Ningtao  LI Qite  REN Xiaotang  TANG Xiaodong  WANG Xinyu  XU Jinyan  XU Shiwei
Institution:1.Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2.Institute of Heavy Ion Physics, Peking University, Beijing 100871, China;3.School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
Abstract:The study of fusion reactions of 12C+13C at the deep sub-barrier energies is very important for the test of predictive power of the extrapolation models for nuclear reactions for astrophysics. Until now, all the measurements below Coulomb barrier energies have to use the statistical model calculations to estimate the branching ratios to deduce the total fusion cross sections. However, the systematic uncertainty induced by the calculated corrections has not been studied well. In this experiment, the fusion cross sections of 12C+13C have been measured using an offline activity measurement in the range of Ec.m.=4.4 to 5.8 MeV. The total fusion cross sections have been deduced from the 24Na activities after correcting the branching ratios estimated with the Hauser-Feshbach statistical model. Through the comparison between our result and other data obtained with other methods, the systematic uncertainty of statistical model has been determined to be 14%.
Keywords:12C+13C fusion at sub-barrier energies  statistical model  systematic error
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