News
- 30 Sep. 2020
- Bui Tuan Khai got Ph.D. on CANDLES experiment -> to News -> to Publication
- 31 Mar. 2020
- Li Xiaolong & Temuge Batpurev got Ph.D. on CANDLES experiment -> to News -> to Publication
- 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
- 09 Mar. 2018
- Participation to an domestic workshop, LBGT2018 -> to News -> to Publication
- 27 Feb. 2018
- A review article will be on Astropaticle Physics. -> to News -> to Publication
- 22 Feb. 2018
- A collaboration meeting was held. -> to News
- 27 Dec. 2017
- A collaboration meeting was held. -> to News
- 13 Nov. 2017
- Participation to an domestic workshop, SMART2017 -> to News -> to Publication
- 29 Sep. 2017
- Mine evacuation drill was done. -> to News
- 05 Sep. 2017
- Participation to an international conference, PANIC2017 -> to News -> to Publication
- 06 Aug. 2017
- A collaboration meeting was held. -> to News
- 28 Jul. 2017
- Participation to an international conference, TAUP2017 -> to News -> to Publication
- 14 Jul. 2017
- Participation to an international conference, ISORD-9 -> to News -> to Publication
- 15 Jun. 2017
- Energy calibration data taking was done. -> to News
- 09 Jun. 2017
- Calibration of oxygen monitors and flammable gas detector was done. -> to News
- 27 May 2017
- Participation to an international conference, LRT2017 -> to News -> to Publication
- 23 May 2017
- Participation to an domestic symposium, UGND 2017 Area symposium -> to News -> to Publication
- 15 May 2017
- A collaboration meeting was held. -> to News
- 02 Mar. 2017
- Energy calibration data taking was done -> to News
- 22 Feb. 2017
- Participation to an domestic symposium, 23rd ICEPP Sympoisum -> to News -> to Publication
- 21 Feb. 2017
- Participation to an domestic workshop, LBGT2017 -> to News -> to Publication
- 23 Jan. 2017
- A collaboration meeting was held. -> to News
- 11 Dec. 2016
- Start of the Run010 measurement -> to Development
- 10 Nov. 2016
- Participation to an international workshop, DBD2016 -> to News -> to Publication
- 30 Oct. 2016
- A collaboration meeting was held. -> to News
- 16 Sep. 2016
- Participation to an international conference, INPC2016 -> to News -> to Publication
- 14 Sep. 2016
- Mine evacuation drill was done. -> to News
- 08 Sep. 2016
- Annual detector investigation was done. -> to News
- 29 Aug. 2016
- A collaboration meeting was held. -> to News
- 13 Jul. 2016
- Start of the steady operation -> to Development
- 11 Jul. 2016
- Energy calibration data taking was done. -> to News
- 20 Jun. 2016
- A collaboration meeting was held. -> to News
- 09 Jun. 2016
- Start of the operation of the cooling system -> to Development
- 08 Jun. 2016
- The shielding system was completed. Evaluation of background reduction using a neutron source was done. -> to Development
- 02 Jun. 2016
- Oxygen monitors and flammable gas detectors have been recalibrated -> to News
- 30 May 2016
- Liquid scintillator and pure water has been installed to CANDLES -> to News
- 25 May 2016
- CANDLES III equipment are assembled -> to News
- 13 May 2016
- CANDLES LS Acrylic Tank has been delivered -> to News
- 11 May 2016
- Participation to an international symposium -> to News -> to
- 11 Jun. 2015
- Lecture for Kamioka users (+ Kamioka tour for new members) -> to News
- 01 Jun. 2015
- Updated : the member list -> to Member
- 29 May 2015
- Collaboration meeting in Osaka -> to News
- 27 May 2015
- Completion inspection for the sheilding system(for the side of the main tank) for CANDLES -> to Depelopment
- 15 May 2015
- Workshop on 'Grant-in-Aid for Scientific Research on Innovative Areas "Revealing the history of the universe with underground particle and nuclear research"' -> to News -> to Publication
- 27 Mar. 2015
- Check for the sheilding system(for the side of the main tank) for CANDLES
- 24 Mar. 2015
- Finishing of the construction of the sheilding system(for the side of the main tank) -> to Depelopment
- 21 Mar. 2015
- JPS Meeting -> to Publication
- 09 Mar. 2015
- Workshop on "Low background technologies" -> to News -> to Publication
- 06 Mar. 2015
- Start of the constraction of the sheilding system(for the side of the main tank) -> to Depelopment
- 05 Mar. 2015
- Meeting of the Society of Isotope Science -> to Pulication
- 12 Feb. 2015
- Presentation of master thesis -> to News
- 30 Jan. 2015
- Collaboration meeting in Fukui -> to News
- 26 Dec. 2014
- Kamioka Work : extraction of liquid scintillator from CANDLES system
- 24 Dec. 2014
- Stop of the operation of the cooling system in CANDLES
- 14 Nov. 2014
- Collaboration meeting in Osaka -> to News
- 24 Oct. 2014
- Start of the operation of the cooling system in CANDLES
- 23 Aug. 2014
- Workshop on 'Grant-in-Aid for Scientific Research on Innovative Areas "Revealing the history of the universe with underground particle and nuclear research"' -> to News -> to Publication
- 21 Aug. 2014
- Collaboration meeting in Osaka -> to News
- 24 May 2014
- Collaboration meeting in Osaka -> to News
- 01 Apr. 2014
- Updated : the member list -> to Member
- 27 Mar. 2014
- JPS Meeting -> to Publication
- 12 Mar. 2014
- Completion inspection for the cooling system for CANDLES -> to Depelopment
- 05 Mar. 2014
- Pre-inspection for the cooling system for CANDLES -> to Depelopment
- 26 Feb. 2014
- The construction of the cooling system -> to Depelopment
- 10 Feb. 2014
- Start of the construction of the cooling system -> to Depelopment
- 29 Jan. 2014
- Kamioka Work : extraction of liquid scintillator from CANDLES system -> to News
- 24 Jan. 2014
- Collaboration meeting in Fukui -> to News
- 25 Nov. 2013
- Fire drill at Kamioka -> to News
- 12 Nov. 2013
- Collaboration meeting in Osaka -> to News
- 20 Sep. 2013
- JPS Meeting -> to Publication
- 09 Aug. 2013
- Collaboration meeting in Osaka -> to News
- 13 Jun. 2013
- Fire drill at Kamioka -> to News
- 20 May 2013
- Collaboration meeting in Osaka -> to News
- 24 Apr. 2013
- Informal meeting on "Studies on Low background technologies in particle and nuclear physics" -> to News -> to Publication
- 01 Apr. 2013
- Updated : the member list -> to Member
- 29 Mar. 2013
- JPS Meeting -> to Pulication
- 14 Feb. 2013
- Update : photographs -> to Library
- 25 Jan. 2013
- Collaboration meeting in Fukui -> to News
- 07 Nov. 2012
- Collaboration meeting
- 13 Jul. 2012
- Open CANDLES web page
- 29 May 2012
- Fire drill at Kamioka
- 29 May 2012
- Collaboration meeting
- 28 May 2012
- Re-start of the measurement with CANDLES
- 31 Mar. 2012
- Constraction of the light pipe system
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.