UCGretina GEANT4对GRETINA Gamma-Ray能量跟踪阵列的仿真
UCGretina GEANT4 Simulation of the GRETINA Gamma-Ray Energy Tracking Array
摘要：
介绍了GRETINA γ射线跟踪阵列高分段高纯锗探测器的GEANT4模拟程序UCGretina。我们已经开发了一个模型的阵列，特别是四模块和胶囊，给出了很好的协议之间的模拟和测量的γ射线能量在很宽的范围内的峰值效率，并再现测量的康普顿连续体的形状。这两个功能都是需要的，以准确地提取γ射线产额从收集在束内γ射线光谱测量与在$v/c \gtrsim 0.3$在国家超导回旋加速器实验室和稀有同位素束设施的光束行进的光谱。在开发模型的过程中，我们确定必须包括围绕模拟晶体的有源体积的毫米级被动锗层，以再现测量的峰值效率。我们采用了一个简单的模型，有效的被动层和启发式的方法来确定被动层的厚度比较的模拟和测量的单晶和全阵列。展望了该模型的发展前景。
英文摘要：
UCGretina, a GEANT4 simulation of the GRETINA gamma-ray tracking array of highly-segmented high-purity germanium detectors is described. We have developed a model of the array, in particular of the Quad Module and the capsules, that gives good agreement between simulated and measured photopeak efficiencies over a broad range of gamma-ray energies and reproduces the shape of the measured Compton continuum. Both of these features are needed in order to accurately extract gamma-ray yields from spectra collected in in-beam gamma-ray spectroscopy measurements with beams traveling at $v/c \gtrsim 0.3$ at the National Superconducting Cyclotron Laboratory and the Facility for Rare Isotope Beams. In the process of developing the model, we determined that millimeter-scale layers of passive germanium surrounding the active volumes of the simulated crystals must be included in order to reproduce measured photopeak efficiencies. We adopted a simple model of effective passive layers and developed heuristic methods of determining passive-layer thicknesses by comparison of simulations and measurements for a single crystal and for the full array. Prospects for future development of the model are discussed.
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