Coincidence measurement of the weak decay of 12ΛC and the three-body weak decay process (J-PARC 50GeV PS E18)

被引：4

作者：

Kim, M. ^{[1
]}

Ajimura, S. ^{[2
]}

Aoki, K. ^{[3
]}

Banu, A. ^{[4
]}

Bhang, H. ^{[1
]}

Fukuda, T. ^{[5
]}

Hashimoto, O. ^{[6
]}

Hwang, J. I.

Kameoka, S. ^{[6
]}

Kang, B. H. ^{[1
]}

Kim, E. ^{[1
]}

Kim, J. H. ^{[1
,7
,8
]}

Maruta, T. ^{[9
]}

Miura, Y. ^{[6
]}

Miyake, Y. ^{[2
]}

Nagae, T. ^{[3
,12
]}

Nakamura, M. ^{[9
]}

Nakamura, S. N. ^{[6
]}

Noumi, H. ^{[2
,3
]}

Okada, S. ^{[10
,11
]}

Okayasu, Y. ^{[6
]}

Outa, H. ^{[3
,11
]}

Park, H. ^{[8
]}

Saha, P. K. ^{[3
,13
]}

Sato, Y. ^{[3
]}

Sekimoto, M. ^{[3
]}

Takahashi, T. ^{[3
]}

Tamura, H. ^{[6
]}

Tanida, K. ^{[1
,11
]}

Toyoda, A. ^{[3
]}

Tshoo, K. ^{[1
]}

Tsukada, K. ^{[6
]}

Watanabe, T. ^{[6
]}

Yim, H. J. ^{[1
]}

机构：

[1] Seoul Natl Univ, Dept Phys & Astron, Seoul 151747, South Korea

[2] Osaka Univ, Dept Phys, Toyonaga 5600043, Japan

[3] High Energy Accelerator Res Org, KEK, Tsukuba, Ibaraki 3050801, Japan

[4] Gesell Schwerionenforsch mbH GSI, D-64291 Darmstadt, Germany

[5] Osaka Electrocommun Univ, Phys Lab, Neyagawa, Osaka 5728530, Japan

[6] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan

[7] Ewha Womans Univ, Dept Phys, Seoul 120750, South Korea

[8] KRISS, Taejon 305600, South Korea

[9] Univ Tokyo, Dept Phys, Hongo 1130033, Japan

[10] Tokyo Inst Technol, Dept Phys, Ookayama 1528551, Japan

[11] RIKEN, Riken Nishina Ctr, Wako, Saitama 3510198, Japan

[12] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[13] Japan Atom Energy Res Inst, Tokai, Ibaraki 3191195, Japan

来源：

NUCLEAR PHYSICS A | 2010年 / 835卷 / 1-4期

基金：

新加坡国家研究基金会;

关键词：

C-12(Lambda); nonmesonic weak decay; three-body process; J-PARC 50GeV PS; INDUCED LAMBDA-DECAY; HYPERNUCLEI; HE-5(LAMBDA); EXCHANGE; NEUTRON; RATIO;

D O I：

10.1016/j.nuclphysa.2010.01.237

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：

Recently we have reported the Gamma(n)/Gamma(p) value, similar to 0.5,obtained in the exclusive coincidence measurement of the nucleon pairs in the back-to-back kinematics, which led to the resolution of the long standing Gamma(n)/Gamma(p) puzzle. We also have reported the branching ratio of the three-body process in the nonmesonic weak decay of C-12(Lambda) to be 0.29 +/- 0.13 by reproducing the quenching of the nucleon yields. At the same time we have finally obtained the absolute decay widths Gamma(n) and Gamma(p) taking account of the three-body processes. However, there still are serious inconsistencies not only between the experimental and theoretical values of important observables such as the decay asymmetry parameter alpha(NM), but also between the basic formalisms of theoretical models. In order to provide more stringent guides for theoretical models, it is urgent to measure the fundamental observables, such as Gamma(n), Gamma(p), and Gamma(2N), with much improved accuracy. In this regards, the next extensive coincidence experiment is planned at the J-PARC 50GeV PS for the accurate determination of the decay widths to the level of similar to 10% statistical uncertainty and the measurement of Gamma(2N) in the exclusive way.

引用

页码：434 / 438

页数：5

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