Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment

被引：34

作者：

Asakura, K. ^{[1
]}

Gando, A. ^{[1
]}

Gando, Y. ^{[1
]}

Hachiya, T. ^{[1
]}

Hayashida, S. ^{[1
]}

Ikeda, H. ^{[1
]}

Inoue, K. ^{[1
,2
]}

Ishidoshiro, K. ^{[1
]}

Ishikawa, T. ^{[1
]}

Ishio, S. ^{[1
]}

Koga, M. ^{[1
,2
]}

Matsuda, S. ^{[1
]}

Mitsui, T. ^{[1
]}

Motoki, D. ^{[1
]}

Nakamura, K. ^{[1
,2
]}

Obara, S. ^{[1
]}

Otani, M. ^{[1
,16
]}

Oura, T. ^{[1
]}

Shimizu, I. ^{[1
]}

Shirahata, Y. ^{[1
]}

Shirai, J. ^{[1
]}

Suzuki, A. ^{[1
]}

Tachibana, H. ^{[1
]}

Tamae, K. ^{[1
]}

Ueshima, K. ^{[1
]}

Watanabe, H. ^{[1
]}

Xu, B. D. ^{[1
,2
]}

Yoshida, H. ^{[1
,3
]}

Kozlov, A. ^{[2
]}

Takemoto, Y. ^{[2
]}

Yoshida, S. ^{[3
]}

Fushimi, K. ^{[4
]}

Banks, T. I. ^{[5
,6
]}

Berger, B. E. ^{[2
,5
,6
]}

Fujikawa, B. K. ^{[2
,5
,6
]}

O'Donnell, T. ^{[5
,6
]}

Winslow, L. A. ^{[7
]}

Efremenko, Y. ^{[2
,8
,9
]}

Karwowski, H. J. ^{[10
,11
,12
,13
]}

Markoff, D. M. ^{[10
,11
,12
,13
]}

Tornow, W. ^{[2
,10
,11
,12
,13
]}

Detwiler, J. A. ^{[2
,14
]}

Enomoto, S. ^{[2
,14
]}

Decowski, M. P. ^{[2
,15
]}

机构：

[1] Tohoku Univ, Res Ctr Neutrino Sci, Sendai, Miyagi 9808578, Japan

[2] Univ Tokyo, Kavli Inst Phys & Math, Univ WPI, Univ Tokyo Inst Adv Study, Kashiwa, Chiba 2778583, Japan

[3] Osaka Univ, Grad Sch Sci, Toyonaka, Osaka 5600043, Japan

[4] Univ Tokushima, Fac Integrated Arts & Sci, Tokushima 7708502, Japan

[5] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[6] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[7] MIT, Cambridge, MA 02139 USA

[8] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[9] Natl Res Nucl Univ, Moscow, Russia

[10] Triangle Univ Nucl Lab, Durham, NC 27708 USA

[11] Duke Univ, Dept Phys, Durham, NC 27706 USA

[12] N Carolina Cent Univ, Dept Phys, Durham, NC USA

[13] Univ N Carolina, Chapel Hill, NC USA

[14] Univ Washington, Ctr Expt Nucl Phys & Astrophys, Seattle, WA 98195 USA

[15] Nikhef Univ Amsterdam, Sci Pk, Amsterdam, Netherlands

[16] High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki, Japan

来源：

NUCLEAR PHYSICS A | 2016年 / 946卷

关键词：

Double-beta decay; Xe-136; Excited state;

D O I：

10.1016/j.nuclphysa.2015.11.011

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 search for double-beta decays of Xe-136 to excited states of Ba-136 has been performed with the first phase data set of the KamLAND-Zen experiment. The 0(1)(+), 2(1)(+) and 2(2)(+) transitions of 0 nu beta beta decay were evaluated in an exposure of 89.5 kg. yr of Xe-136, while the same transitions of 2 nu beta beta decay were evaluated in an exposure of 61.8 kg. yr. No excess over background was found for all decay modes. The lower half-life limits of the 2(1)(+) state transitions of 0 nu beta beta and 2 nu beta beta decay were improved to T-1/2(0 nu) (0(+) -> 2(1)(+)) > 2.6 x 10(25) yr and T-1/2(2 nu)) (0(+) -> 2(1)(+)) > 4.6 x 10(23) yr (90% C.L.), respectively. We report on the first experimental lower half-life limits for the transitions to the 0(1)(+) Oil-state of Xe-136 for 0 nu beta beta and 2 nu beta beta decay. They are T-1/2(0 nu) (0(+) -> 0(1)(+)) > 2.4 x 10(25) yr and T-1/2(2 nu)(0(+) -> 0(1)(+)) > 8.3 x 10(23) yr (90% C.L.). The transitions to the 22 states are also evaluated for the first time to be T-1/2(0 nu) (0(+) -> 2(2)(+)) > 2.6 x 10(25) yr and T-1/2(2 nu) (0(+) -> 2(2)(+)) > 9.0 x 10(23) yr (90% C.L.). These results are compared to recent theoretical predictions. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：171 / 181

页数：11

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