Production of radioactive isotopes through cosmic muon spallation in KamLAND
Production of radioactive isotopes through cosmic muon spallation in KamLAND
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DOI：
10.1103/physrevc.81.025807
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发表时间：
2010-02-01
影响因子：
3.1
通讯作者：
Decowski, M. P.
中科院分区：
文献类型：
--
作者：
Abe, S.;Enomoto, S.;Decowski, M. P.
通过宇宙介子散裂产生的放射性同位素是宇宙中罕见事件探测的背景。探测器，双衰变实验，以及暗物质搜索。了解宇宙背景的本质对于未来旨在确定pep和CNO太阳中微子通量的实验尤其重要，因为背景主要是C-11的散裂产生。来自神冈液体闪烁体反中微子探测器（KamLAND）的数据为更好地理解这些背景提供了有价值的信息，特别是在液体闪烁体中，并用于检查基于MUSIC， FLUKA和GEANT4的当前模拟的估计。利用探测到的μ子和中子捕获之间的时间相关性，测量出KamLAND液体闪烁体中的中子产率为Y-n = (2.8 +/- 0.3) x 10(-4) mu(-1) g(-1) cm(2)。对于其他同位素，生产产率是根据观测到的与已知同位素寿命相关的时间来确定的。我们发现一些产率与基于加速器介子束实验的外推不一致。
Radioactive isotopes produced through cosmic muon spallation are a background for rare-event detection in. detectors, double-beta-decay experiments, and dark-matter searches. Understanding the nature of cosmogenic backgrounds is particularly important for future experiments aiming to determine the pep and CNO solar neutrino fluxes, for which the background is dominated by the spallation production of C-11. Data from the Kamioka liquid-scintillator antineutrino detector (KamLAND) provides valuable information for better understanding these backgrounds, especially in liquid scintillators, and for checking estimates from current simulations based upon MUSIC, FLUKA, and GEANT4. Using the time correlation between detected muons and neutron captures, the neutron production yield in the KamLAND liquid scintillator is measured to be Y-n = (2.8 +/- 0.3) x 10(-4) mu(-1) g(-1) cm(2). For other isotopes, the production yield is determined from the observed time correlation related to known isotope lifetimes. We find some yields are inconsistent with extrapolations based on an accelerator muon beam experiment.