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arXiv 0801.0263nucl-ex
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低本底锗探测器中Ge73-m亚稳态的产生和衰变

Production and Decay of the Ge73-m Metastable State in a Low-Background Germanium Detector

TEXONO Collaboration, H. Y. Liao

摘要:

$\ge73m$亚稳态以非常典型的特征衰减,这允许它们被逐个事件标记。使用在核电反应堆堆芯附近的低背景实验室中用高纯度锗检测器采集的数据进行研究,其中$\nuebar$ -通量为$\rm{6.4 \times 10^{12} ~ cm^{-2} s^{-1}}$。测量的$\ge73m$的平均和平衡生产速率分别为$\rm{(8.7 \pm 0.4)}$和$\rm{(6.7 \pm 0.3) ~ kg^{-1} day^{-1}}$。研究并确定了生产通道。通过研究反应堆ON和OFF谱中$\ge73m$产生的差异,导出了反应堆在$\rm{\sim 10^{-42} - 10^{-43} ~ cm^2}$区对中微子核跃迁截面的极限灵敏度。占主导地位的背景是由于$β$ -宇宙射线诱导的$^{73}$ Ga的衰变。讨论了提高地下位置灵敏度的前景。

英文摘要:

The $\ge73m$ metastable states decay with a very characteristic signature which allow them to be tagged event-by-event. Studies were performed using data taken with a high-purity germanium detector in a low-background laboratory near a nuclear power reactor core where $\nuebar$-flux was $\rm{6.4 \times 10^{12} ~ cm^{-2} s^{-1}}$. The measured average and equilibrium production rates of $\ge73m$ were $\rm{(8.7 \pm 0.4)}$ and $\rm{(6.7 \pm 0.3) ~ kg^{-1} day^{-1}}$, respectively. The production channels were studied and identified. By studying the difference in the production of $\ge73m$ between the reactor ON and OFF spectra, the limiting sensitivities at the range of $\rm{\sim 10^{-42} - 10^{-43} ~ cm^2}$ for the cross-sections of neutrino-induced nuclear transitions were derived. The dominant background are due to $β$-decays of cosmic-ray induced $^{73}$Ga. The prospects of enhancing the sensitivities at underground locations are discussed.

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