A Study on Energy Resolution of CANDLES Detector
作者： S. Ajimura , S. Umehara , M. Nomachi , R. Hazama , I. Ogawa
关键词:
摘要: In a neutrinoless double-beta decay ( $0\nu \beta $ ) experiment, energy resolution is important to distinguish between and background events. CAlcium fluoride for studies of Neutrino Dark matters by Low Energy Spectrometer (CANDLES) discerns the 48Ca using CaF2 scintillator as detector source. Photomultiplier tubes (PMTs) collect scintillation photons. At $Q$ value 48Ca, current (2.6%) exceeds ideal statistical fluctuation number photoelectrons (1.6%). Because CaF2’s long constant 1000 ns, signal integration within 4000 ns used calculate energy. The baseline $\sigma _{\mathrm{ baseline}}$ accumulated in integration, thus degrading resolution. This article CANDLES detector, which severely degrades 1% at 48Ca. To avoid , photon counting can be obtain each PMT; however, significant photoelectron overlapping probability PMT causes missing reduces “Partial counting” minimizes loss. We improved resolutions 4.5%–4.0% 1460.8 keV $\gamma -ray 40K) 3.3%–2.9% 2614.5 208Tl). estimated from 2.6% 2.2%, sensitivity half-life 1.09 times.
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