Accès ouvert
2021
article
OpenAlex
S. Ajimura, W. M. Chan, K. Ichimura, T. Ishikawa et autres
We developed a CANDLES-III system to study the neutrinoless double beta ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) decay of $^{48}\mathrm{Ca}$. The proposed system employs 96 ${\mathrm{CaF}}_{2}$ scintillation crystals (305 kg) with natural Ca ($^{\mathrm{nat}}\mathrm{Ca}$) isotope which corresponds 350 g of $^{48}\mathrm{Ca}$. External backgrounds were rejected using a …
jp
(code pays fourni par la source)
Accès ouvert
2020
conference-paper
OpenAlex
S. Umehara, M. Nomachi, T. Kishimoto, S. Ajimura et autres
Abstract We have studied the neutrino-less double beta decay(0νββ) of 48Ca with the CANDLES III system, which consists of CaF2(pure) scintillators. Rejection analyses for background events from radioactive contaminations in the CaF2(pure) scintillators were effective to reduce backgrounds in Qββ -value region. …
jp
(code pays fourni par la source)
Accès ouvert
2020
article
OpenAlex
T. Iida, K. Mizukoshi, Toshihiro Ohata, Takashi Uehara et autres
jp, de
(code pays fourni par la source)
Accès ouvert
2020
conference-paper
OpenAlex
K. Tetsuno, S. Ajimura, K. Akutagawa, T. Batpurev et autres
Abstract CANDLES(CAlcium fluoride for the study of Neutrinos and Dark matters by Low Energy Spectrometer) is the experiment to search for the neutrino-less double beta decay(0vββ) of 48Ca with CaF2 scintillator. 48Ca has the highest Q ββ -value (4.3 MeV) among all …
jp, us, kr
(code pays fourni par la source)
Accès ouvert
2020
conference-paper
OpenAlex
S. Umehara, T. Kishimoto, M. Nomachi, S. Ajimura et autres
Abstract We have studied the neutrino-less double beta decay(0νββ) of 48Ca by using CaF2(pure) scintillators. Analysis for rejection of backgrounds(212Bi→ 212Po events and 208Tl events) was effective to reduce backgrounds in Qββ-value region. No events are observed in the Qββ-value region for …
jp
(code pays fourni par la source)
Accès ouvert
2019
article
OpenAlex
K. Nakajima, T. Batpurev, W. M. Chan, F. Dokaku et autres
In the CANDLES experiment aiming to search for the very rare neutrino-less double beta decays (0νββ) using 48 Ca, we introduced a new shielding system for high energy γ-rays from neutron captures in massive materials near the detector, in addition to the …
jp
(code pays fourni par la source)
2018
article
OpenAlex
K. Nakajima, T. Iida, K. Akutagawa, T. Batpurev et autres
jp
(code pays fourni par la source)
2018
conference-paper
OpenAlex
K. Nakajima, T. Batpurev, W. M. Chan, F. Dokaku et autres
CANDLES aims to measure the very rare neutrino-less double beta decays using 48Ca which has the highest value among all isotope candidates. Low background techniques are the key to observe such rare phenomena. The largest background was found to be the high …
jp
(code pays fourni par la source)