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《Chinese Physics C》 2019年12期
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Measurements of differential and angle-integrated cross sections for the ~(10)B(n, α)~7Li reaction in the neutron energy range from 1.0 eV to 2.5 MeV

江浩雨  蒋伟  白怀勇  崔增琪  张国辉  樊瑞睿  易晗  宁常军  周良  唐靖宇  安琪  鲍杰  鲍煜  曹平  陈昊磊  陈琪萍  陈永浩  陈裕凯  陈朕  封常青  高可庆  顾旻皓  韩长材  韩子杰  贺国珠  何泳成  洪杨  黄翰雄  黄蔚玲  黄锡汝  季筱路  吉旭阳  姜智杰  敬罕涛  康玲  康明涛  李波  李超  李嘉雯  李论  李强  李晓  李样  刘荣  刘树彬  刘星言  栾广源  穆奇丽  齐斌斌  任杰  任智洲  阮锡超  宋朝晖  宋英鹏  孙虹  孙康  孙晓阳  孙志嘉  谭志新  唐洪庆  唐新懿  田斌斌  王丽娇  王鹏程  王琦  王涛峰  王朝辉  文杰  温中伟  吴青彪  吴晓光  吴煊  解立坤  羊奕伟  于莉  余滔  于永积  张林浩  张奇玮  张显鹏  张玉亮  张志永  赵豫斌  周路平  周祖英  朱丹阳  朱科军  朱鹏  
【摘要】:Differential and angle-integrated cross sections for the ~(10)B(n,α)~7 Li,~(10)B(n,α_0) ~7 Li and ~(10)B(n,α_1) ~7 Li~*reactions have been measured at CSNS Back-n white neutron source.Two enriched(90%) ~(10)B samples 5.0 cm in diameter and~85.0 μg/cm~2 in thickness each with an aluminum backing were prepared,and back-to-back mounted at the sample holder.The charged particles were detected using the silicon-detector array of the Light-charged Particle Detector Array(LPDA) system.The neutron energy En was determined by TOF(time-of-flight) method,and the valid a events were extracted from the E_n-Amplitude two-dimensional spectrum.With 15 silicon detectors,the differential cross sections of a-particles were measured from 19.2°to 160.8°.Fitted with the Legendre polynomial series,the(n,a) cross sections were obtained through integration.The absolute cross sections were normalized using the standard cross sections of the ~(10)B(n,α) ~7 Li reaction in the 0.3-0.5 MeV neutron energy region.The measurement neutron energy range for the ~(10)B(n,α) ~7 Li reaction is 1.0 eV≤E_n 2.5 Me V(67 energy points),and that for the ~(10)B(n,α_0) ~7 Li and~(10)B(n,α_1) ~7 Li~*reactions is 1.0 eV≤E_n1.0 MeV(59 energy points).The present results have been analyzed by the resonance reaction mechanism and the level structure of the ~(11)B compound system,and compared with existing measurements and evaluations.

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