Author/Authors :
Lou، نويسنده , , Jianling and Li، نويسنده , , Zhihuan and Ye، نويسنده , , Yanlin and Hua، نويسنده , , Hui and Faisal، نويسنده , , Q.J. and Jiang، نويسنده , , Dongxing and Li، نويسنده , , Xiangqing and Zhang، نويسنده , , Shuangquan and Zheng، نويسنده , , Jiang-Tao and Ge، نويسنده , , Yucheng and Kong، نويسنده , , Zan-Min Song، نويسنده , , Yushou and Lv، نويسنده , , Linhui and Li، نويسنده , , Chen and Lu، نويسنده , , Fei and Fan، نويسنده , , Fengying and Li، نويسنده , , Zhongyu and Cao، نويسنده , , Zhongxin and Ma، نويسنده , , Liying and Li، نويسنده , , Qite and Xiao، نويسنده , , Jun، نويسنده ,
Abstract :
A β -delayed neutron detection array composed of a neutron sphere and two neutron walls was constructed in the State Key Laboratory of Nuclear Physics and Technology at Peking University. Recently the performances of this detection array were largely improved and tested with a Co 60 source, cosmic rays and C 16 and N 17 radioactive beams. The Tyvek 1056D paper and silicone grease were chosen for the reflection and coupling materials, respectively. For the neutron sphere with large detection solid angle ( 30 % of 4 π steradian), the intrinsic efficiency is about 14.1 % at a neutron energy of 1 MeV and the detection threshold is about 350 keV; for the neutron walls with flexible setup, these values are 36.5 % and 200 keV, respectively. The combined array of neutron sphere and neutron walls has successfully been applied to measure the β -delayed neutrons emitted from neutron-rich unstable nuclei.
Keywords :
? -delayed neutron detection array , Energy resolution , Intrinsic efficiency , Time-of-flight (TOF) , Detection threshold
