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

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arxiv 2003.13404 v1 pith:GKALMYCX submitted 2020-03-26 physics.ins-det hep-exnucl-ex

classification physics.ins-dethep-exnucl-ex
keywords calibrationcandlesgammasystemenergyq-valueabsenceachieve
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abstract

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 $\gamma$-ray source. Therefore, we have developed a novel calibration system based on $\gamma$-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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