Neutrino-less double beta decay of 48Ca - CANDLES

T. Kishimoto, S. Yoshida, K. Matsuoka, K. Ichimura, G. Ito, K. Yasuda, H. Kakubata, M. Miyashita, K. Takubo, M. Nomachi, M. Saka, K. Seki, S. Ajimura, S. Umehara, N. Nakatani, Y. Tamagawa, I. Ogawa, K. Fushimi, R. Hazama, H. OhsumiK. Okada, Y. Fujii

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Neutrino-less double beta decay (0νββ) is currently known to be an only experiment to verify whether lepton number is conserved or not. The lepton number non-conservation is the key to create matter dominated universe with CP violation. The so-called leptogenesys scenario presents a way to create the matter dominated universe by these violations. If neutrinos have Majorana mass, transition from a particle to an anti-particle is possible and the left-handed and right-handed neutrinos could have different masses. It is highly likely that the neutrinos are Majorana particles. We have been studying double beta decay of 48Ca. Our first stage experiment using the ELEGANT VI detector system gave the best lower limit of the half life of 0νββ of 48Ca. We have been working on CANDLES detector system to sense much longer lifetime region. We have developed techniques to reduce backgrounds. The CADLES detector system was installed at Kamioka underground laboratory. Here I describe a schematic view of the system.

Original languageEnglish
Title of host publicationInternational Conference on the Structure of Baryons, BARYONS'10
Number of pages7
Publication statusPublished - 2011
Externally publishedYes
EventInternational Conference on the Structure of Baryons, BARYONS'10 - Osaka, Japan
Duration: 2010 Dec 72010 Dec 11

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


OtherInternational Conference on the Structure of Baryons, BARYONS'10


  • Low background measurement
  • Neutrino-less double beta decay
  • lepton number non-conservation

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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