GAMMA：用于重离子碰撞反应中选择angular momentum的Gamma多重性过滤阵列
GAMMA: GAMma Multiplicity Filter Array for the selection of angular momentum in heavy ion collision reactions
摘要：
设计、制造了一个50单元BaF_2 γ多重性过滤器，并成功地安装在加尔各答可变能量回旋加速器中心（VECC），用于重离子碰撞反应中的角动量选择。进行了GEANT 3蒙特卡罗模拟，以优化阵列的单个探测器形状和几何结构。探测器由裸露的氟化钡晶体（每个长度为5 cm，横截面积为3.5 x 3.5 cm 2）内部制造。利用实验室标准射线源研究了探测器的基本性能.滤波器的响应函数已被研究使用GEANT 3映射到角动量空间的过滤器的折叠分布。多重数滤波器已成功地用于20 Ne（E = 145 & 160 MeV）+93 Nb，27 Al反应中复合核的高角动量和252 Cf自发裂变源裂变碎片的低角动量事件的测量。该滤波器还成功地用于校正重离子聚变反应中的非统计事件。
英文摘要：
A 50 element BaF2 gamma-multiplicity filter has been designed, fabricated and installed successfully at the Variable Energy Cyclotron Centre (VECC), Kolkata for angular momentum selection in heavy ion collision reactions. A thorough GEANT3 Monte Carlo simulation was performed to optimize the individual detector shape and geometrical structure of the array. The detectors have been fabricated in-house from bare barium fluoride crystals (each measuring 5 cm in length and having cross-sectional area of 3.5 x 3.5 cm2). The basic detector properties have been studied using the lab standard -ray sources. The response function of the filter has been studied using GEANT3 for mapping the fold distribution of the filter onto the angular momentum space. The multiplicity filter has been used successfully to measure the high angular momentum of the compound nuclei populated in the reaction 20Ne (E = 145 & 160 MeV) + 93Nb, 27Al as well as low angular momentum events from the fission fragments of 252Cf spontaneous fission source. The filter has also been used successfully for correcting non-statistical events involved in the heavy ion fusion reaction.
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