Direct measurement of 11B(p,γ)12C astrophysical S factors at low energies

被引：5
|
作者：
He, J. J. [1 ,2 ]
Jia, B. L. [1 ,3 ]
Xu, S. W. [1 ,3 ]
Chen, S. Z. [4 ]
Ma, S. B. [1 ,3 ]
Hou, S. Q. [1 ]
Hu, J. [1 ,5 ]
Zhang, L. Y. [1 ,6 ]
Yu, X. Q. [1 ]
机构：
[1] Chinese Acad Sci, IMP, Lanzhou 730000, Peoples R China
[2] Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[4] Chinese Acad Sci, Inst Nucl Energy Safety Technol, POB 1135, Hefei 230031, Peoples R China
[5] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA
[6] Univ Edinburgh, Sch Phys, Mayfield Rd, Edinburgh EH9 3JZ, Midlothian, Scotland
来源：
PHYSICAL REVIEW C | 2016年 / 93卷 / 05期
基金：
中国国家自然科学基金;
关键词：
THERMONUCLEAR REACTION-RATES; LIGHT-NUCLEI; CROSS-SECTIONS; COMPILATION; RESONANCE; STATE; C-12;
D O I：
10.1103/PhysRevC.93.055804
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：
We directly measure the absolute cross section of B-11(p,gamma)C-12 in the energy region of E-c.m. = 130-257 keV by using a thin target for the first time. This work is performed on a 320-kV platform at the Institute of Modern Physics in Lanzhou. The astrophysical S factors of this reaction are obtained for capture to the ground and first excited states of C-12. The properties of the known resonance at similar to 150 keV are derived and agree with the previous results. However, in the energy region of 170-240 keV, our S factors are about 15%-50% larger than the adopted values in NACRE II and are also larger than the upper limits of NACRE II by up to similar to 20%. This indicates that our new reaction rate is enhanced by about 15%-50% compared to the NACRE II adopted rate in the temperature region 0.32-0.62 GK.
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页数：5
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