Experimental study of C13(α,n)O16 reactions in the Majorana Demonstrator calibration data
Experimental study of C13(α,n)O16 reactions in the Majorana Demonstrator calibration data
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马约拉纳演示器校准数据中 C13(α,n)O16 反应的实验研究
DOI：
10.1103/physrevc.105.064610
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发表时间：
2022
影响因子：
3.1
通讯作者：
Caldwell, T. S.
中科院分区：
文献类型：
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作者：
Arnquist, I. J.;Avignone, F. T.;Barabash, A. S.;Barton, C. J.;Bhimani, K. H.;Blalock, E.;Bos, B.;Busch, M.;Buuck, M.;Caldwell, T. S.
中子俘获和反应产物的延迟衰变是超稀有事件搜索中常见的背景源。在这项工作中，我们研究了马约拉纳演示器的校准源内发射的粒子引起的反应。这些源是封闭在富碳材料中的钍基校准标准。当入射粒子超过反应值时，激发态所发射的6129 keV射线估计了反应速率。由于Demonstrator的锗探测器具有出色的能量性能，这些特征光子可以在校准数据中清晰地观察到。在Geant4模拟的帮助下，对观测到的6129 keV光子速率和基于atalys的软件预测进行了比较。测量和预测被认为是一致的，尽管有很大的统计不确定性。该协议提供了支持的背景预测fromreactions在未来的双β衰变搜索工作。
Neutron captures and delayed decays of reaction products are common sources of backgrounds in ultrarare event searches. In this work, we studiedreactions induced byparticles emitted within the calibration sources of theMajorana Demonstrator. These sources are thorium-based calibration standards enclosed in carbon-rich materials. The reaction rate was estimated by using the 6129-keVrays emitted from the excitedstates that are populated when the incomingparticles exceed the reactionvalue. Thanks to the excellent energy performance of theDemonstrator's germanium detectors, these characteristic photons can be clearly observed in the calibration data. Facilitated byGeant4simulations, a comparison between the observed 6129-keV photon rates and predictions by atalys-based software was performed. The measurements and predictions were found to be consistent, albeit with large statistical uncertainties. This agreement provides support for background projections fromreactions in future double-beta decay search efforts.