CANDLES

  • CANDLES

    Double Beta Decay Experiment


  • CANDLES

    Double Beta Decay Experiment


  • CANDLES

    Double Beta Decay Experiment


  • CANDLES

    Double Beta Decay Experiment


  • CANDLES

    Double Beta Decay Experiment


  • CANDLES

    Double Beta Decay Experiment


  • CANDLES

    Double Beta Decay Experiment

News

01 Jul. 2019
The workshop of underground science will be held in Osaka. -> to Link
27 Feb. 2019
Fire drill was conducted -> to News
22 Feb. 2019
A collaboration meeting was held. -> to News
14 Dec. 2018
LS transfer was held. -> to Development
22 Nov. 2018
88Y calibration was held. -> to Development
15 Nov. 2018
Neutron calibration was held -> to Development
04 Oct. 2018
A collaboration meeting was held. -> to News
23 Jun. 2018
A collaboration meeting was held. -> to News
18 Apr. 2018
Energy calibration data taking was done. -> to News
27 Mar. 2018
Takaki Ohata & Tsuyoshi Maeda got Ph.D. on CANDLES experiment -> to News -> to Publication

Information

Welcome to CANDLES web page.

RCNP double beta decay project is challenging observation of 48Ca double beta decay with the CANDLES system, which is installed at the Kamioka observatory, Institute for Cosmic Ray Research(ICRR), the University of Tokyo.
Our previous detector for 48Ca double beta decay measurement was the ELEGANT VI system. The detector gave the most stringent limit on half-life of 48Ca double beta decay by using CaF2 scintillators with total mass of 7 kg. The CANDLES system is the scale-up detector of the ELEGANT VI system for the study of 48Ca double beta decay.

Here we introduce the CANDLES detector and the related studies.

CANDLES

candlesiii  Almost all substance of the universe is made of "matter". On the other hand, we know the existence of a partner called its "antimatter". At the beginning of the universe, the amount of "antimatter" is the same as that of the "matter". At present, no "antimatter" exists. Why does the universe mostly consist of "matter"? The one of the key points to solve the mystery is the lepton number violation that means "antimatter" and "matter" can convert to each other.

The study of "neutrino-less double beta decay" will give a solution to the problem of "matter" and "antimatter". The purpose of the CANDLES project is to study of "neutrino-less double beta decay".

"Neutrino-less double beta decay" has a very long half-life, which is longer than 1024 years. In order to measure the decay, detector system needs a large amount of double beta decay nuclei. In order to achieve this we proposed CANDLES by using CaF2 scintillators, which include the large amount of double beta decay nuclei 48Ca.