伽利略探测器中γ射线角分布及其稳定性研究  

Study of γ-ray Angular Distribution and Efficiency Stability of GALILEO HPGe Detector Array

作　　者：侯颖 蒲忠胜[1] HOU Ying;PU Zhongsheng(School of Sciences,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学理学院,甘肃兰州730050

出　　处：《甘肃科学学报》2022年第6期5-9,共5页Journal of Gansu Sciences

摘　　要：用串联式加速器系统将~6Li束流加速到34 MeV后,轰击厚度为550μg/cm~2的Y靶核上,该反应中γ射线的角分布可以通过伽利略高纯锗探测器阵列进行简单的研究。在该反应的剩余核Mo中选择不同跃迁阶的γ射线329 keV、110 keV、1 097 keV、2 064 keV,比较它们随探测器摆放角度增大而变化的强度。研究发现在四极跃迁(ΔI=2)时γ射线的相对强度随探测器摆放角度的增大而增大,在偶极跃迁(ΔI=1)时γ射线的相对强度随探测器摆放角度的增大而减小,且在误差允许范围内,同一跃迁阶(ΔI=1或ΔI=2)的γ射线强度比也较稳定。结果表明,当ΔI=2时,γ射线沿90°方向的强度较小;当ΔI=1时,γ射线沿90°方向的强度较大。这说明在不同极性下的γ射线强度与角分布有相当的关联性。之后在不同的运行数据下选择773 keV、1 509 keV 2条γ射线,比较其强度比可以看出,在不同的运行数据下它们之间的强度比基本保持不变,这也表明伽利略探测器阵列具有良好的效率稳定性。The angular distribution of γ-ray in the reaction of a ~6Libeam accelerated to 34 MeV by a tandem accelerator system bombarding anY target nucleus of a thickness of 550 mμg/cm~2 can be studied by using the GALILEO HPGe(High purity germanium) detector array.The γ-rays, 329 keV,110 keV,1 097 keV,2 064 keV,in different transition order were selected in the residual nucleusMo of the reaction, and their intensity with the increase of the angle of detector was compared.It can be find that the relative intensity of γ-ray increased with the increase of the detector placement angle in the quadrupole transition(ΔI=2) and the relative intensity of γ-ray increased with the increase of the detector placement angle in the dipole transition(ΔI=1).Moreover, in the allowable error range, the intensity of γ-ray in the same transition order(ΔI=1 or ΔI=2) was more stable.The results show that when ΔI=2,the intensity of γ-ray is smaller along 90° direction.When ΔI=1,the intensity of γ-ray is stronger along 90° direction.This indicates that the intensity of γ-rays at different polarity are correlated with the angular distribution.Then, two γ-rays, 773 keV and 1 509 keV,were selected under different operating data and compared their intensity ratios.It can be seen that the intensity ratios between them basically remain unchanged under different operating data, which also indicates that the GALILEO HPGe detectorarray has good efficiency stability.

关 键 词：伽利略阵列 剩余核 角分布 探测效率 

分 类 号：O571[理学—粒子物理与原子核物理]