Double beta decay study of 48Ca by CaF2 scintillator

被引：7
|
作者：
Ogawa, I [1 ]
Hazama, R
Ajimura, S
Matsuoka, K
Kudomi, N
Kume, K
Ohsumi, H
Fushimi, K
Suzuki, N
Nitta, T
Miyawaki, H
Shiomi, S
Tanaka, Y
Ishikawa, Y
Itamura, M
Kishimoto, K
Katsuki, A
Sakai, H
Yokoyama, D
Umehara, S
Tomii, S
Mukaida, K
Yoshida, S
Ejiri, H
Kishimoto, T
机构：
[1] Osaka Univ, Grad Sch Sci, Toyonaka, Osaka 5600043, Japan
[2] Osaka Univ, Res Ctr Nucl Phys, Osaka 5670047, Japan
[3] Saga Univ, Fac Culture & Educ, Saga 8408502, Japan
[4] Univ Tokushima, Fac Integrated Arts & Sci, Tokushima 7708502, Japan
来源：
NUCLEAR PHYSICS A | 2003年 / 721卷
关键词：
D O I：
10.1016/S0375-9474(03)01115-1
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
A CaF2 scintillation detector system (ELEGANT VI) is developed to search for neutrino-less double beta decay (0nuDBD) of Ca-48. No events were observed around the Q-value energy region after the analysis of 4.23 kg yr data. To derive the lower limit for the half-life, the expected number of background events was estimated by a Monte Carlo simulation using the measured activities of Bi-214 and Rn-220 inside CaF2 crystals. A new lower limit is obtained to be 1.8 x 10(22) yr at the 90% C.L.
引用
收藏
页码：525C / 528C
页数：4
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