2006 Fiscal Year Final Research Report Summary
Neutrino mass study using 100Mo double beta decay with spectroscopic detector MOON
Project/Area Number |
15204022
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Research Category |
Grant-in-Aid for Scientific Research (A)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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Research Institution | Osaka University |
Principal Investigator |
NOMACHI Masaharu Osaka University, Graduate school of science, Professor (90208299)
|
Co-Investigator(Kenkyū-buntansha) |
SUGAYA Yorihito Osaka University, Graduate school of science, Assistant Professor (80324747)
EJIRI Hiroyasu Osaka University, Professor Emeritus (80013374)
FUSHIMI Ken-ichi Tokushima University, Faculty of Integrated Arts and Sciences, Associate Professor (90274191)
SHIMA Tasushi Osaka University, Research Center for Nuclear Physics, Assistant Professor (10222035)
|
Project Period (FY) |
2003 – 2006
|
Keywords | double beta decay |
Research Abstract |
We have developed prototype detector MOON-1 for the next generation double beta decay experiment. The detector is installed at Ohto underground laboratory, Research Center for Nuclear Physics, Osaka University. MOON-1 is six layers of plastic scintillator plates (53cm square) and 100Mo foils interleaved by the scintillator plates. Scintillation light is collected by 60 photo multipliers surrounding the plates. The developments and the measurements were proceeded as the followings. 2003: Test measurements 2004: Design and development of the MOON-1 detector 2005: Install in the underground laboratory and start the measurements. 2006: Continue the measurements. MOON-1 was uninstalled in the autumn. 2007: Thst measurements. Calibration method in the low background environment is developed. Energy resolution is evaluated using Compton scattering of background gamma rays. Energy resolution is a key in the detector sensitivity for neutrino-less double beta decay. It is one of the most important points to rest MOON-1 detector. The resolution obtained is 7%(FWHM) at the Q value of the double beta decay. It is quite good resolution for such large (53cm square) plastic scintillator plates. The background is studied for developing the next generation double beta decay detectors.
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Research Products
(20 results)