Neutron energy spectra from the nonmesonic weak decay of _Λ¹²C and _Λ⁸⁹Y hypernuclei

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J. H. Kim^*, H. Bhang, M. J. Kim, Y. D. Kim^†, and H. Park^‡
Department of Physics, Seoul National University, Seoul 151-742, Korea

S. Ajimura, T. Kishimoto, S. Minami, T. Mori, A. Sakaguchi, Y. Shimizu, and M. Sumihama
Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan

T. Endo, O. Hashimoto, T. Miyoshi^§, J. Nishida, T. Saito, Y. Sato^**, S. Satoh, T. Takahashi, and H. Tamura
Department of Physics, Tohoku University, Sendai, 980-8578, Japan

T. Fukuda^††, T. Nagae, H. Noumi, H. Outa^‡‡, and M. Sekimoto
High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan

H. Hotchi^a and K. Tanida^‡‡
Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan

R. Sawafta
Department of Physics, North Carolina A&T State University, Greensboro, North Carolina 27411, USA

L. I. Tang
Department of Physics, Hampton University, Hampton, Virginia 23668, USA

^*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.

^aPresent address: Center for Proton Accelerator Facilities, Japan Atomic Energy Research Institute, Tokai 319-1195, Japan.