首页|A long 3He proportional counter array for the study of β-delayed neutron emission probability at BRIF
A long 3He proportional counter array for the study of β-delayed neutron emission probability at BRIF
Yang-Ping, Dr. Shen Guo, Dr. Bing 郭冰 Liu, Mr. Wei-Ping Jin-Long, Mr. Ma Tian, Mr. Jun-Wen Xie, Mr. DongLin Huang, Mr. HongWei Lin, Dr. Weiping Xie, Mr. DeHao Tang, Mr. Yi Wen, Mr. Cun Su, Prof. Jun Qin, Mr. ZhiWei Ma, Mr. Junrui Nan, Dr. Weike Tu, Miss Wanqin Nan, Dr. Wei Yan, Dr. Shengquan Yun-Ju, Prof. Li Wang, Dr. Qiang Wang, Mr. You-Bao Yu-Qiang, Mr. Zhang Zhu, Mr. Ming-Hao
A long 3He proportional counter array for the study of β-delayed neutron emission probability at BRIF
A long 3He proportional counter array for the study of β-delayed neutron emission probability at BRIF
摘要
The β-delayed neutron emission probability (Pn) is an indispensable quantity to describe the decay strength of very neutron-rich nuclei and the rapid neutron capture process in nuclear astrophysics. A Long HElium-3 Neutron Array (LHENA), is developed at the Beijing Rare Isotope Facility (BRIF) to initiate Pn measurements using Isotope Separated On Line (ISOL) pulsed beams. LHENA is designed to work in conjunction with a tape driver and different detectors, so that β particles, β-delayed neutrons and γ rays emitted from the implanted nuclei can be measured simultaneously in periodical mode. LHENA consists of 21 long 3He proportional counters embedded in a polyethylene-made moderator in two-ring structure, which allows for a flat neutron detection efficiency up to 3 MeV according to our Geant4 simulation. The detection efficiency has been experimentally determined to be 16.4(±0.4)% using the 51V(p,n)51Cr reaction for neutron energies in the 120-700 keV range. A good flatness in neutron detection efficiency and very low background of LHENA are verified, which lay a solid foundation for the first Pn measurement using very neutron-rich Rb isotopes at BRIF.
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