arXiv 2003.134042020-03-26physics.ins-dethep-exnucl-ex

CANDLES的（n，γ）反应能量刻度系统

The energy calibration system for CANDLES using (n, γ) reaction

T. Iida, K. Mizukoshi, T. Ohata, T. Uehara, T. Batpurev, W. M. Chan, K. Fushimi, R. Hazama, M. Ishikawa, H. Kakubata, K. Kanagawa, S. Katagiri, B. T. Khai, T. K… 展开作者

T. Iida, K. Mizukoshi, T. Ohata, T. Uehara, T. Batpurev, W. M. Chan, K. Fushimi, R. Hazama, M. Ishikawa, H. Kakubata, K. Kanagawa, S. Katagiri, B. T. Khai, T. Kishimoto, X. Li, T. Maeda, K. Matsuoka, K. Morishita, M. Moser, K. Nakajima, M. Nomachi, I. Ogawa, M. Shokati, K. Suzuki, Y. Takemoto, Y. Takihira, Y. Tamagawa, K. Tetsuno, V. T. T. Trang, S. Umehara, S. Yoshida

备注：: 6 pages, 7 figures
DOI：: 10.1016/j.nima.2020.164727

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摘要：

用低能能谱仪研究中微子和暗物质的氟化钙使用CaF $_2$闪烁体阵列研究$^{48}$ Ca的无中微子双β衰变。$^{48}$ Ca在4，272 keV处的高Q值使我们能够实现非常低的背景条件，然而，由于没有标准的高能$γ$射线源，因此在校准探测器的Q值区域时会引起困难。因此，我们开发了一种新的基于中子俘获$^{28}$ Si、$^{56}$ Fe和$^{58}$ Ni核的$γ$射线辐射的刻度系统。在本文中，我们报告的新的校准系统的发展，以及在CANDLES的能量校准的结果高达9 MeV。

英文摘要：

CAlcium fluoride for the study of Neutrinos and Dark matters by Low-energy Spectrometer (CANDLES) searches for neutrino-less double beta decay of $^{48}$Ca using a CaF$_2$ scintillator array. A high Q-value of $^{48}$Ca at 4,272 keV enabled us to achieve very low background condition, however, at the same it causes difficulties in calibrating the detector's Q-value region because of the absence of a standard high-energy $γ$-ray source. Therefore, we have developed a novel calibration system based on $γ$-ray emission by neutron capture on $^{28}$Si, $^{56}$Fe and $^{58}$Ni nuclei. In the paper, we report the development of the new calibration system as well as the results of energy calibration in CANDLES up to 9 MeV.

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