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

• 作者: Chen Liang Ge Honglin Ju Yongqin Ma Fei Zhang Hongbin Zhang Xueying
• 来源期刊: 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
• 学科: 物理学
• 关键词: THICK LEAD TARGET
• 年，卷（期）: 2014,（1）
• 页码范围: 71-71
• 页数: 1页
• 分类号: O4

摘要

The neutron yield from thick target of Pb irradiated with 250 MeV protons has been studied experimentally.The 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.