用于GERDA实验的背景建模
Background modeling for the GERDA experiment
摘要：
2011年11月，INFN LNGS的无中微子双β（0 nubb）衰变实验GERDA开始进行物理数据采集。本文提出了一种分析，旨在了解和模拟观察到的背景能谱，这在寻找一个罕见的信号，如0 nubb衰变中发挥着至关重要的作用。一个非常有前途的初步模型已经获得，与系统的不确定性仍在研究中。从该模型中可以推导出重要的信息，例如期望的背景及其在信号区域中的分解。根据该模型，Qbb周围的主要背景贡献来自Bi-214，Th-228，K-42，Co-60和Ra-226衰变链中的α放射同位素，其中一部分取决于假定的源位置。
英文摘要：
The neutrinoless double beta (0nubb) decay experiment GERDA at the LNGS of INFN has started physics data taking in November 2011. This paper presents an analysis aimed at understanding and modeling the observed background energy spectrum, which plays an essential role in searches for a rare signal like 0nubb decay. A very promising preliminary model has been obtained, with the systematic uncertainties still under study. Important information can be deduced from the model such as the expected background and its decomposition in the signal region. According to the model the main background contributions around Qbb come from Bi-214, Th-228, K-42, Co-60 and alpha emitting isotopes in the Ra-226 decay chain, with a fraction depending on the assumed source positions.
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