Response of the GLAST LAT calorimeter to relativistic heavy ions
Response of the GLAST LAT calorimeter to relativistic heavy ions
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DOI：
10.1016/j.nima.2005.12.211
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发表时间：
2006-05
影响因子：
1.4
通讯作者：
B. Lott;F. Piron;B. Blank;G. Bogaert;J. Bregeon;G. Canchel;A. Chekhtman;P. d’Avezac;D. Dumora;J. Giovinazzo;J. Grove;M. Hellström;A. Jacholkowska;W. Johnson;E. Nuss;T. Reposeur;D. Smith;K. Sümmerer
中科院分区：
文献类型：
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作者：
B. Lott;F. Piron;B. Blank;G. Bogaert;J. Bregeon;G. Canchel;A. Chekhtman;P. d’Avezac;D. Dumora;J. Giovinazzo;J. Grove;M. Hellström;A. Jacholkowska;W. Johnson;E. Nuss;T. Reposeur;D. Smith;K. Sümmerer
伽马射线大面积空间望远镜(GLAST)的CSI量热计将在飞行中与宇宙射线重离子进行校准。为了确定量能器对轻于铁的相对论重离子的响应，在GSI重离子装置上用碎片分离器(FRS)进行了实验。对于轻离子，测量的响应表现出一个意想不到的特征，与在低入射能量下观察到的特征相反：对于给定的沉积能量，这些离子的观测信号大于质子(或者更一般地，Z=1的最小电离粒子)。发现碳离子和Z=1粒子的脉冲形状几乎相同，具有显著的慢闪烁成分，这构成了与低能量行为的另一种背离。还提供了有关单个CSI晶体的能量分辨率和量热计中核反应造成的离子损失的数据。
The CsI calorimeter of the Gamma-Ray Large-Area Space Telescope (GLAST) will be calibrated in flight with cosmic-ray heavy ions. In order to determine the response of the calorimeter to relativistic heavy ions lighter than Fe, an experiment was carried out at the GSI heavy ion facility using the Fragment Separator (FRS). The measured response exhibits an unexpected feature for light ions, opposite to that observed at low incident energy: for a given deposited energy, the observed signal is greater for these ions than for protons (or more generally Z=1 minimum ionizing particles). Pulse shapes are found to be almost identical for carbon ions and Z=1 particles, with a significant slow scintillation component, which constitutes another departure from the low-energy behavior. Data on the energy resolution for the individual CsI crystals and on the loss of ions due to nuclear reactions in the calorimeter are also presented.