ID 113808
Author
Chan, W.M. Osaka University
Kishimoto, T. Osaka University
Umehara, S. Osaka University|Tohoku University
Matsuoka, K. Osaka University
Suzuki, K. Wakasa Wan Energy Research Center
Yoshida, S. Osaka University
Nakajima, K. University of Fukui
Iida, T. University of Tsukuba
Nomachi, M. Osaka University
Ogawa, I. University of Fukui
Tamagawa, Y. University of Fukui
Hazama, Ryuta Osaka Sangyo University
Takemoto, Y. Osaka University
Nakatani, N. Osaka University
Takihira, Y. Osaka University
Tozawa, M. University of Fukui
Kakubata, H. Osaka University
Trang, V.T.T. Osaka University
Ohata, T. Osaka University
Tetsuno, K. Osaka University
Maeda, T. Osaka University
Khai, B.T. Osaka University
Li, X.L. Osaka University
Batpurev, T. Osaka University
Content Type
Journal Article
Description
A low background HPGe detector system was developed at CANDLES Experimental Hall for multipurpose use. Various low background techniques were employed, including hermatic shield design, radon gas suppression, and background reduction analysis. A new pulse shape discrimination (PSD) method was specially created for coaxial Ge detector. Using this PSD method, microphonics noise and background event at low energy region less than 200 keV can be rejected effectively. Monte Carlo simulation by GEANT4 was performed to acquire the detection efficiency and study the interaction of gamma-rays with detector system. For rare decay measurement, the detector was utilized to detect the nature’s most stable isomer tantalum-180m (180Tam) decay. Two phases of tantalum physics run were completed with total livetime of 358.2 days, which Phase II has upgraded shield configuration. The world most stringent half-life limit of 180Tam has been successfully achieved.
Journal Title
AIP Conference Proceedings
ISSN
0094243X
NCID
AA00502977
Publisher
AIP Publishing
Volume
1921
Issue
1
Start Page
030004
Published Date
2018-01-03
EDB ID
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
eng
TextVersion
Publisher
departments
Science and Technology