https://doi.org/10.1051/epjconf/20100305013
The Contribution of the Three-Body Process in the Nonmesonic Weak Decay of the Λ12C Hypernucleus.
1
Department of Physics and Astronomy, Seoul National
University, Seoul, 151-747, Korea
2
Department of Physics, Osaka University,
Toyonaga
560-0043,
Japan
3
High Energy Accelerator Research Organization
(KEK), Tsukuba
305-0801,
Japan
4
Gesellschaft fur Schwerionenforschung mbH (GSI),
Darmstadt
64291
Germany
5
Lab. of Physics, Osaka Electro Communication
University, Neyagawa
572-8530,
Japan
6
Department of Physics, Tohoku University,
Sendai
980-8578,
Japan
7
Department of Physics, Ewha Womans University,
Seoul
120-750,
Korea
8
Korea Research Institute of Standards and Science
(KRISS), Daejeon
305-600,
Korea
9
Department of Physics, University of Tokyo,
Hongo
113-0033,
Japan
10
Department of Physics, Tokyo Institute of
Technology, Ookayama
152-8551,
Japan
11
Riken Nishina Center, Riken, Wako
351-0198,
Japan
12
Department of Physics, Kyoto University,
Kyoto
606-8502,
Japan
13
Japan Atomic Energy Research Institute,
Tokai
319-1195,
Japan
a e-mail: bhang@snu.ac.kr
The serious inconsistency problem between the values of experimental and theoretical Γn /Γp ratio of the nonmesonic weak decay of Λ hypernuclei has been resolved recently. We have shown that the reason behind the problem was the quenching of the nucleon yields which in turn was due to the contribution of the three-body process. We have measured that the branching ratio of the three-body process in nonmesonic weak decay, 0.29±0.13, is so large that the absolute values of Γn and Γp must be determined taking account of the contribution of the 3-body process. In this paper, the recent studies toward the finding of the 3-body process via the exclusive coincidence experiments are presented.
© Owned by the authors, published by EDP Sciences, 2010