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Phys. Rev. Lett. 103, 182502 (2009) [5 pages]

Three-Body Nonmesonic Weak Decay of the <sub>Lambda</sub><sup>12</sup>C Hypernucleus

M. Kim,1 S. Ajimura,2 K. Aoki,3 A. Banu,4 H. Bhang,1 T. Fukuda,5 O. Hashimoto,6 J. I. Hwang,7 S. Kameoka,6 B. H. Kang,1 E. Kim,1 J. H. Kim,1,8 T. Maruta,9 Y. Miura,6 Y. Miyake,2 T. Nagae,3,12 M. Nakamura,9 S. N. Nakamura,6 H. Noumi,3,2 S. Okada,10,11 Y. Okayasu,6 H. Outa,3,11 H. Park,8 P. K. Saha,3,13 Y. Sato,3 M. Sekimoto,3 T. Takahashi,3 H. Tamura,6 K. Tanida,11,1 A. Toyoda,3 K. Tshoo,1 K. Tsukada,6 T. Watanabe,6 and H. J. Yim1
1Department of Physics and Astronomy, Seoul National University, Seoul, 151-747, Korea
2Department of Physics, Osaka University, Toyonaga 560-0043, Japan
3High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
4Gesellschaft fur Schwerionenforschung mbH (GSI), Darmstadt 64291 Germany
5Laboratory of Physics, Osaka Electro Communication University, Neyagawa 572-8530, Japan
6Department of Physics, Tohoku University, Sendai 980-8578, Japan
7Department of Physics, Ewha Womans University, Seoul 120-750, Korea
8Korea Research Institute of Standards and Science (KRISS), Daejeon 305-600, Korea
9Department of Physics, University of Tokyo, Hongo 113-0033, Japan
10Department of Physics, Tokyo Institute of Technology, Ookayama 152-8551, Japan
11Riken Nishina Center, Riken, Wako 351-0198, Japan
12Department of Physics, Kyoto University, Kyoto 606-8502, Japan
13Japan Atomic Energy Agency, Tokai 319-1195, Japan

Received 5 August 2009; published 30 October 2009

We have measured the branching ratio of the three-body process in the nonmesonic weak decay of <sub>Lambda</sub><sup>12</sup>C to be 0.29±0.13. This result was obtained by reproducing the nucleon and the nucleon pair yields introducing a measured final state interaction. At the same time, we have determined the absolute decay widths, Gamman and Gammap, along with Gamma2N, whose relative ratio has been a long-standing puzzle. Including the three-body process, we have successfully reproduced the nucleon energy distribution, the coincidence two-nucleon angular correlation, and the momentum sum distribution simultaneously.

©2009 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.103.182502
DOI: 10.1103/PhysRevLett.103.182502
PACS: 21.80.+a; 13.30.Eg; 13.75.Ev
  • 21.80.+a
    Hypernuclei
  • 13.30.Eg
    Hadronic decays of baryons
  • 13.75.Ev
    Hyperon-nucleon interactions (energy≤10 GeV)
  • YEAR: 2009

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