论文标题
宇宙基因$^9 $ li和$^8 $ HE的生产率的测量
Measurement of cosmogenic $^9$Li and $^8$He production rates at RENO
论文作者
论文摘要
我们报告了使用Reno实验的两个相同的探测器，报告了由Cosmic Muon Spallation在$^{12} $ C上生产的不稳定同位素的生产率和$^8 $。他们的β-伴随中子伴随着中子的背景，在精确测定最小的中微子混合角，为反应堆抗神经抗体事件的背景做出了重大贡献。其靠近（FAR）检测器的平均灵恩能量为120（450）M.W.E.估计为33.1 +-2.3（73.6 +-4.4）GEV。基于大约3100天的数据，$^9 $ li（$^8 $ he）同位素的宇宙生产率为近探测器的每天为44.2 +-3.1（10.6 +-7.4），在远探测器每天为10.0 +-1.1（2.1 +-1.5）。这对应于$^9 $ li（$^8 $ he），4.80 +-0.36（1.15 +-0.81）和9.9 +-1.1（2.1 +-1.5）在附近和远处检测器，在10 $^{ - 8} $ $ $ $ $ $ $^{ - 1} $ g $ g $ g $^$} $} $} $ {^2} $ {^2} $ {^2} $ {^$} $ {^$} $ {^$} $ {^$} $中将测量的$^9 $ li收益率与其他可用地下测量结果相结合，发现收益率相对于平均值能量的出色幂律关系的指数为$α$ = 0.75 +-0.05。
We report the measured production rates of unstable isotopes $^9$Li and $^8$He produced by cosmic muon spallation on $^{12}$C using two identical detectors of the RENO experiment. Their beta-decays accompanied by a neutron make a significant contribution to backgrounds of reactor antineutrino events in precise determination of the smallest neutrino mixing angle. The mean muon energy of its near (far) detector with an overburden of 120 (450) m.w.e. is estimated as 33.1 +- 2.3 (73.6 +- 4.4) GeV. Based on roughly 3100 days of data, the cosmogenic production rate of $^9$Li ($^8$He) isotope is measured to be 44.2 +- 3.1 (10.6 +- 7.4) per day at near detector and 10.0 +- 1.1 (2.1 +- 1.5) per day at far detector. This corresponds to yields of $^9$Li ($^8$He), 4.80 +- 0.36 (1.15 +- 0.81) and 9.9 +- 1.1 (2.1 +- 1.5) at near and far detectors, respectively, in a unit of 10$^{-8}$ $μ^{-1}$ g${^-1}$ cm${^2}$. Combining the measured $^9$Li yields with other available underground measurements, an excellent power-law relationship of the yield with respect to the mean muon energy is found to have an exponent of $α$ = 0.75 +- 0.05.
