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Phys. Rev. C 68, 065201 (2003) [5 pages]

Neutron energy spectra from the nonmesonic weak decay of Λ12C and Λ89Y hypernuclei
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J. H. Kim et al.
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Received 1 April 2002; revised 23 May 2003; published 16 December 2003

We have measured the neutron spectra emitted in the weak decay of Λ12C and Λ89Y over the energy region above 10  MeV in the (π+,K+) reaction with better statistics and an improved signal-to-background ratio. The neutron yields in the nonmesonic weak decays were obtained from the spectra. By using the proton yield of Λ12C , the Γn∕Γp ratio was estimated to be 0.51±0.15  (stat) from the neutron-to-proton yield ratio for the first time, which suggests the Γn∕Γp ratio is significantly less than unity.


©2003 The American Physical Society

URL: http://link.aps.org/abstract/PRC/v68/e065201
DOI: 10.1103/PhysRevC.68.065201
PACS: 21.80.+a, 13.30.Eg, 13.75.Ev

* Present address: Department of Physics, Chung-Ang University, Seoul 156-756, Korea.
† Present address: Department of Physics, Sejong University, Seoul 143-747, Korea.
‡ Present address: KRISS, Daejeon 305-600, Korea.
§ Present address: Department of Physics, University of Houston, Houston, TX 77204-5506.
** Present address: High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.
†† Present address: Laboratory of Physics, Osaka Electro-Communication University, Neyagawa, Osaka 572-8530, Japan.
‡‡ Present address: RIKEN, Wako 351-0198, Japan.
Present address: Center for Proton Accelerator Facilities, Japan Atomic Energy Research Institute, Tokai 319-1195, Japan.

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