Non-mesonic weak decays of {sub {lambda}}{sup 5}He and {sub {lambda}}{sup 12}C hypernuclei using the ({pi}{sup +},K{sup +}) reactions

Journal Article · Tue Apr 29 04:00:00 EDT 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2932278· OSTI ID:21143228

Okada, S; Outa, H ^[1]; Ajimura, S; Miyake, Y ^[2]; Aoki, K; Noumi, H; Sato, Y; Sekimoto, M; Takahashi, T; Toyoda, A ^[3]; Banu, A ^[4]; Bhang, H C; Hwang, J I; Kang, B H; Kim, E H; Kim, M J; Yim, H J ^[5]; Fukuda, T ^[6]; Hashimoto, O; Kameoka, S ^[7]

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1. RIKEN Nishina Center, RIKEN, Saitama 351-0198 (Japan)
2. Department of Physics, Osaka University, Toyonaka 560-0043 (Japan)
3. High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801 (Japan)
4. Gesellschaft fuer Schwerionenforschung mbH (GSI), Darmstadt 64291 (Germany)
5. Department of Physics, Seoul National University, Seoul 151-742 (Korea, Republic of)
6. Laboratory of Physics, Osaka Electro-Communication University, Neyagawa 572-8530 (Japan)
7. Department of Physics, Tohoku University, Sendai 980-8578 (Japan)

We have measured for the first time yields of both neutron-proton and neutron-neutron pairs emitted from the non-mesonic weak decay of the {sub {lambda}}{sup 5}He and {sub {lambda}}{sup 12}C hypernuclei, produced via the ({pi}{sup +},K{sup +}) reaction. From the yields of both the back-to-back np-pair events and nn-pair events, we have directly determined the ratio of the neutron- and proton-induced decay widths, {gamma}{sub n}({lambda}n{yields}nn)/{gamma}{sub p}({lambda}p{yields}np). Meanwhile, we have also determined the quenching of the observed numbers of single nucleons and coincident nucleon pairs compared with theoretical calculations. Our results suggest that contributions from the two-nucleon-induced three-body process {lambda}NN{yields}NNN are significant.

• OSTI ID: 21143228
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1011; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CARBON 12
HELIUM 5
HYPERNUCLEI
KAONS PLUS
NEUTRONS
NUCLEAR REACTION YIELD
NUCLEAR STRUCTURE
NUCLEON-HYPERON INTERACTIONS
PION PLUS REACTIONS
PIONS PLUS
PROTONS
THREE-BODY PROBLEM
WEAK HADRONIC DECAY