M. Tozawa

Laser isotope separation of 48Ca for the study of neutrinoless double beta decay and the CANDLES project

Izumi Ogawa, Tasuku Hiraiwa, Junya Nakajima, Ren Yuhaku et autres

We are developing a ⁴⁸Ca isotope enrichment system using laser isotope separation via deflection for the experiments to search for neutrino-less double beta decay. We confirmed with a TOF detector that only ⁴⁸Ca was deflected in the direction of a deflection laser, …

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Development of laser isotope separation (LIS) of

Anawat Rittirong, S. Umehara, K. Mishima, Tatsushi Shima et autres

Investigating neutrinoless double beta decay experiment (0νββ) offers one of the most direct paths toward understanding the nature of neutrinos. The CANDLES investigated this phenomenon using 48Ca, which has the highest Q-value of 4.23 MeV among the double beta decay nuclides. Nevertheless, …

Development of laser isotope separation (LIS) of 48 Ca for the study of neutrinoless double beta decay

Anawat Rittirong, S. Umehara, K. Mishima, Tatsushi Shima et autres

Investigating neutrinoless double beta decay experiment (0νββ) offers one of the most direct paths toward understanding the nature of neutrinos. The CANDLES investigated this phenomenon using 48Ca, which has the highest Q-value of 4.23 MeV among the double beta decay nuclides. Nevertheless, …

jp, es (code pays fourni par la source)

CANDLES-III detector: Low-background spectrometer for studying neutrino-less double β decay of 48Ca

S. Ajimura, K. Akutagawa, T. Batpurev, F. Doukaku et autres

The CANDLES-III detector was installed at the Kamioka Observatory in Japan to investigate the double β decay of 48 Ca. This system combines an undoped calcium fluoride scintillator with a long attenuation length (larger than 100 cm), and a two-phase liquid scintillator, …

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Laser isotope separation to study for the neutrino-less double beta decay of 48Ca

Izumi Ogawa, Tasuku Hiraiwa, Jun Nakajima, R Yuhaku et autres

Abstract The laser isotope separation (LIS) system is being developed for the study of neutrino-less double beta decay of 48Ca. A proof-of-principle experiment has been successfully conducted, and development of a mass production (∼1 mol/year) system is currently underway. For stable and …

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Status of $^{48}$Ca double beta decay search with CANDLES

S. Umehara, Takaaki Harada, Akihiro Hashimoto, R. Hazama et autres

We have studied the neutrino-less double beta decay(0$\nu\beta\beta$) of $^{48}$Ca with the CANDLES III system, which consists of CaF$_{2}$(pure) scintillators. The first result of $^{48}$Ca double beta decay with the CANDLES III system was obtained by using 130.4 days of data. In …

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Status of 48Ca double beta decay search in CANDLES

Y. Minami, Ken-Ichi Fushimi, Takaaki Harada, Akihiro Hashimoto et autres

We study a strategy to reduce veto-time in the search for neutrino-less double-beta decay (0υββ) with CANDLES-III system. We develop a new likelihood analysis and apply it to our new Run010 data. We show that we can increase the un-vetoed live-time by …

Development of the laser isotope separation method to study for the neutrino-less double beta decay of 48 Ca

Izumi Ogawa, Yusuke Kawashima, Tasuku Hiraiwa, M. Tozawa et autres

Abstract Search for the ultra-rare process, neutrino-less double beta decay, is a powerful tool to test the Majorana nature of neutrinos. Among the potential double beta decay nuclei, 48 Ca has the largest Q-value, hence we can expect the measurement with least …

jp (code pays fourni par la source)

Status of 48Ca double beta decay search in CANDLES

Y. Minami, Takaaki Harada, Akihiro Hashimoto, R. Hazama et autres

Abstract We study a strategy to reduce veto-time in the search for neutrino-less double-beta decay (0υββ) with CANDLES-III system. We develop a new likelihood analysis and apply it to our new Run010 data. We show that we can increase the un-vetoed live-time …

jp (code pays fourni par la source)

Low background measurement in CANDLES-III for studying the neutrinoless double beta decay of Ca 48

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 …

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Search for neutrino-less double beta decay of 48Ca-CANDLES-

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. …

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

T. Iida, K. Mizukoshi, Toshihiro Ohata, Takashi Uehara et autres

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