Simulations of neutron activation background for the NνDEx experiment

IF 4.2 3区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Qianming Wang , Zeyu Huang , Pengchong Hu , Emilio Ciuffoli
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引用次数: 0

Abstract

An extremely low-background environment is a crucial requirement for any neutrinoless double beta decay experiment. Neutrons are very difficult to stop, because they can pass through the shielding and activate nuclei in the detector, even inside the fiducial volume itself. Using Geant4 simulations we have studied the neutron background for NνDEx-100 and the most efficient way to reduce it. Using a 60 cm thick external high-density polyethylene (HDPE) shielding the neutron background can be reduced down to 0.24±0.06 events/year, lower than the background rate due to natural radioactivity (0.42 events/year), which was used as a benchmark for these calculations. The amount of HDPE needed can be significantly reduced by placing a filler in the empty space between the lead shielding and the steel vessel; in this way, it is sufficient to add 20 cm external HDPE shielding to reduce the neutron background down to 0.15±0.05 events/year.

NνDEx 实验的中子活化背景模拟
对于任何无中子双贝塔衰变实验来说,极低的背景环境都是一个至关重要的要求。中子很难被阻止,因为它们可以穿过屏蔽并激活探测器中的原子核,甚至在靶体积内也是如此。我们利用 Geant4 模拟研究了 NνDEx-100 的中子背景以及减少中子背景的最有效方法。使用 60 厘米厚的外部高密度聚乙烯(HDPE)屏蔽,中子本底可降至 0.24±0.06 事件/年,低于天然放射性本底率(0.42 事件/年),后者被用作这些计算的基准。通过在铅屏蔽和钢容器之间的空隙中放置填充物,可以大大减少所需的高密度聚乙烯数量;这样,只需增加 20 厘米的外部高密度聚乙烯屏蔽,就可以将中子本底降低到 0.15±0.05 事件/年。
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来源期刊
Astroparticle Physics
Astroparticle Physics 地学天文-天文与天体物理
CiteScore
8.00
自引率
2.90%
发文量
41
审稿时长
79 days
期刊介绍: Astroparticle Physics publishes experimental and theoretical research papers in the interacting fields of Cosmic Ray Physics, Astronomy and Astrophysics, Cosmology and Particle Physics focusing on new developments in the following areas: High-energy cosmic-ray physics and astrophysics; Particle cosmology; Particle astrophysics; Related astrophysics: supernova, AGN, cosmic abundances, dark matter etc.; Gravitational waves; High-energy, VHE and UHE gamma-ray astronomy; High- and low-energy neutrino astronomy; Instrumentation and detector developments related to the above-mentioned fields.
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