Double Beta Decays of 116Cd

Hiroyasu Ejiri; Ken–ichi Fushimi; Ryuta Hazama; Michio Kawasaki; Vasiliy Koutsu; Nobuyuki Kudomi; Kyo Kume; Koichiro Nagata; Hideaki Ohsumi; Kenji Okada; Hirokazu Sano; Toshio Senoo; Tokushi Shibata; Tatsushi Shima; Jun–ichi Tanaka; Yuri Zesenko

doi:10.1143/jpsj.64.339

Double Beta Decays of ¹¹⁶Cd

Hiroyasu Ejiri, Ken–ichi Fushimi, Ryuta Hazama, Michio Kawasaki, Vasiliy Koutsu, Nobuyuki Kudomi, Kyo Kume, Koichiro Nagata, Hideaki Ohsumi, Kenji Okada, Hirokazu Sano, Toshio Senoo, Tokushi Shibata, Tatsushi Shima, Jun–ichi Tanaka, Yuri Zesenko

著者情報

Hiroyasu Ejiri
Department of Physics and Laboratory for Nuclear Studies, Osaka University, Toyonaka 560
Ken–ichi Fushimi
Department of Physics and Laboratory for Nuclear Studies, Osaka University, Toyonaka 560
Ryuta Hazama
Department of Physics and Laboratory for Nuclear Studies, Osaka University, Toyonaka 560
Michio Kawasaki
Department of Physics and Laboratory for Nuclear Studies, Osaka University, Toyonaka 560
Vasiliy Koutsu
Institute for Nuclear Research, Kiev, Prospect Nauki, 47 Kiev 252028, Ukraine
Nobuyuki Kudomi
Department of Physics and Laboratory for Nuclear Studies, Osaka University, Toyonaka 560
Kyo Kume
Department of Physics and Laboratory for Nuclear Studies, Osaka University, Toyonaka 560
Koichiro Nagata
Department of Physics and Laboratory for Nuclear Studies, Osaka University, Toyonaka 560
Hideaki Ohsumi
Department of Physics and Laboratory for Nuclear Studies, Osaka University, Toyonaka 560
Kenji Okada
Department of Physics and Laboratory for Nuclear Studies, Osaka University, Toyonaka 560
Hirokazu Sano
Department of Physics and Laboratory for Nuclear Studies, Osaka University, Toyonaka 560
Toshio Senoo
Department of Physics and Laboratory for Nuclear Studies, Osaka University, Toyonaka 560
Tokushi Shibata
Department of Physics and Laboratory for Nuclear Studies, Osaka University, Toyonaka 560
Tatsushi Shima
Department of Physics and Laboratory for Nuclear Studies, Osaka University, Toyonaka 560
Jun–ichi Tanaka
Department of Physics and Laboratory for Nuclear Studies, Osaka University, Toyonaka 560
Yuri Zesenko
Institute for Nuclear Research, Kiev, Prospect Nauki, 47 Kiev 252028, Ukraine

キーワード: radioactivity, ¹¹⁶Cd(ββ), T^2ν_1/2 fixed value, exclusive measurement, isotopically enriched Cd sample, ultralow-background detector ELEGANT V, M^2ν_ββ evaluation

ジャーナル認証あり

1995 年 64 巻 2 号 p. 339-343

DOI https://doi.org/10.1143/jpsj.64.339

詳細

抄録

Double beta decays (β β ) from the 0⁺ ground state in ¹¹⁶Cd to the 0⁺ ground state in ¹¹⁶Sn were studied by means of ELEGANT V. A finite half-life for the two-neutrino ββ (2νββ ) and an upper limit on the neutrinoless one (0νββ) were obtained as T^2ν_1/2=2.6^+0.9_-0.5× 10¹⁹, y and T^0ν_1/2>6.3× 10²¹, y (68\The nuclear matrix element M^2ν_ββ was deduced as 0.069± 0.009 in units of (m_ec²)^-1. This supports the universal quenching of the 2νββ rates in this mass region, which is consistent with that previously measured in ¹⁰⁰Mo.

責任著者(Corresponding author)

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