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A study on energy resolution of CANDLES detector | | B. T. Khai
; S. Ajimura
; W. M. Chan
; K. Fushimi
; R. Hazama
; H. Hiraoka
; T. Iida
; K. Kanagawa
; H. Kino
; T. Kishimoto
; T. Maeda
; K. Nakajima
; M. Nomachi
; I. Ogawa
; T. Ohata
; K. Suzuki
; Y. Takemoto
; Y. Takihira
; Y. Tamagawa
; M. Tozawa
; M. Tsuzuki
; S. Umehara
; S. Yoshida
; | | Date: |
24 Sep 2020 | | Abstract: | In a neutrino-less double-beta-decay ($0
uetaeta$) experiment, an
irremovable two-neutrino double-beta-decay ($2
uetaeta$) background
surrounds the Q-value of the double beta decay isotope. The energy resolution
must be improved to differentiate between $0
uetaeta$ and $2
uetaeta$
events. CAlcium fluoride for studies of Neutrino and Dark matters by Low Energy
Spectrometer (CANDLES) discerns the $0
uetaeta$ of $^{48}$Ca using a
CaF$_2$ scintillator as the detector and source. Photomultiplier tubes (PMTs)
collect scintillation photons. Ideally, the energy resolution should equal the
statistical fluctuation of the number of photoelectrons. At the Q-value of
$^{48}$Ca, the current energy resolution (2.6%) exceeds this fluctuation
(1.6%). Because of CaF$_2$’s long decay constant of 1000 ns, a signal
integration in 4000 ns is used to calculate the energy. The baseline
fluctuation ($sigma_{
m baseline}$) is accumulated in the signal integration,
degrading the energy resolution. Therefore, this paper studies $sigma_{
m
baseline}$ in the CANDLES detector, which has a severe effect (1%) at the
Q-value of $^{48}$Ca. To avoid $sigma_{
m baseline}$, photon counting can be
used to obtain the number of photoelectrons in each PMT; however, a significant
photoelectron signal overlapping probability in each PMT causes missing
photoelectrons in counting and reduces the energy resolution. "Partial photon
counting" reduces $sigma_{
m baseline}$ and minimizes photoelectron loss. We
thus obtain improved energy resolutions of 4.5--4.0% at 1460.8 keV
($gamma$-ray of $^{40}$K), and 3.3--2.9% at 2614.5 keV ($gamma$-ray of
$^{208}$Tl). The energy resolution at the Q-value shows an estimated
improvement of 2.2%, with improved detector sensitivity by factor 1.09 for the
$0
uetaeta$ half-life of $^{48}$Ca. | | Source: | arXiv, 2009.11509 | | Services: | Forum | Review | PDF | Favorites | |
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