安装在地下的高功率靶的中微子产率和中子屏蔽计算

Adriana Bungau, Jose Alonso, Roger Barlow, Larry Bartozsek, Janet Conrad, Michael Shaevitz, Joshua Spitz, Daniel Winklehner
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引用次数: 0

摘要

随着以粒子加速器为基础的核物理和粒子物理、放射性同位素生产以及核工程设施的束流功率不断增加,能够承受这种功率的目标以及二次粒子的屏蔽变得越来越重要。在这里,我们介绍使用成熟的 Geant4 软件进行的蒙特卡罗(MC)计算,以优化和预测一个 $^8$Li 衰变源(DAR)的反中微子产率。该源依靠来自撞击铍靶的连续波质子束的 600~kW 束功率,其中的剥落中子俘获 $^7$Li 以产生 $^8$Li。我们还对围绕该靶的中子屏蔽进行了深入研究。我们表明,我们可以产生发现级实验IsoDAR所需的高反中微子通量,搜索 "无源 "中微子(预测的新基本粒子)和其他超越标准模型的物理,同时保持探测器中低于自然背景的中子通量。本文介绍的方法很容易转移到其他高功率目标及其相关屏蔽上。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Neutrino yield and neutron shielding calculations for a high-power target installed in an underground setting
With the ever increasing beam power at particle accelerator-based facilities for nuclear and particle physics, radioactive isotope production, and nuclear engineering, targets that can withstand this power, and shielding of secondary particles are becoming increasingly important. Here we present Monte Carlo (MC) calculations using the well-established Geant4 software to optimise and predict the antineutrino yield of a $^8$Li Decay-At-Rest (DAR) source. The source relies on 600~kW of beam power from a continuous wave proton beam impinging on a beryllium target, where spallation neutrons capture on $^7$Li to produce the $^8$Li. We further present an in-depth treatment of the neutron shielding surrounding this target. We show that we can produce the high antineutrino flux needed for the discovery-level experiment IsoDAR, searching for ``sterile'' neutrinos (predicted new fundamental particles) and other beyond standard model physics, while maintaining a neutron flux in the detector that is below natural backgrounds. The methods presented in this paper are easily transferable to other high-power targets and their associated shielding.
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