2-31 Study of Spallation Yield of Neutrons Produced in Thick Lead Target

作     者：Ma Fei Zhang Xueying Ju Yongqin Zhang Hongbin Chen Liang Ge Honglin 

作者机构：不详 

出 版 物：《IMP & HIRFL Annual Report》 (中国科学院近代物理研究所和兰州重离子研究装置年报（英文版）)

年 卷 期：2014年第1期

页      面：71-71页

学科分类：07[理学] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China (11305229, 11105186, 91226107, 91026009, 11205208) StrategicPriority Research Program of Chinese Academy of Sciences (XDA03030300) 

主　　题：Thick Lead Target 

摘      要：The neutron yield from thick target of Pb irradiated with 250 MeV protons has been studied *** Pb target was surrounded by a water bath, where this size effectively contained most of the neutrons emittedfrom the target. The moderated neutrons were measured by the activity induced in an array of Au activation foils(with or without Cd cover). The axial coordinates of the foils without Cd cover were Z = -15, -10, -5, 0, 5, 10, 15,20 cm along the target axial, and the radial coordinates of the foils were R = 7.5, 12.5, 17.5, 22.5 and 27.5 cm abovethe target axial. The Au-foil activities were determined by measuring the peak intensities of the 412 keV line from198Au[1], and the results are shown in Fig. 1.