Coincidence Exclusive Measurement of the Nonmesonic Weak Decay of {sub {lambda}}{sup 12}C

Journal Article · Tue Jul 11 04:00:00 EDT 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2220322· OSTI ID:20873370

Kim, M J ^[1]; Ajimura, S; Aoki, K; Banu, A; Bhang, H; Fukuda, T; Hashimoto, O; Hwang, J I; Kameoka, S; Kang, B H; Kim, E H; Kim, J H; Maruta, T; Miura, Y; Miyake, Y; Nagae, T; Nakamura, M; Nakamura, S N; Noumi, H; Okada, S ^[2]

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1. School of Physics, Seoul National University Seoul 151-747 (Korea, Republic of)
2. and others

We have measured the angular correlation of the pair nucleons np and nn emitted from the nonmesonic weak decay (NMWD) of {sub {lambda}}{sup 12}C produced via the ({pi}+,K+) reaction in coincidence measurement. The {lambda}p {yields} np and {lambda}n {yields} nn modes were clearly identified by measuring the back-to-back correlation of the emitted nucleon pairs which is the characteristic of two-body kinematics. From the measured nucleon pair numbers Nnn and Nnp, the ratio {gamma}n/{gamma}p of the partial decay widths {gamma}n({lambda}n {yields} nn) and {gamma}p({lambda}p {yields} np) of {sub {lambda}}{sup 12}C was extracted to be 0.51 {+-} 0.13(stat){+-}0.04(syst); this result is almost free from the ambiguity due to the nuclear final state interaction and 3-body decay process, which were inherent in the previous results. The obtained {gamma}n/{gamma}p ratio of {sub {lambda}}{sup 12}C (p-shell) is close to that of {sub {lambda}}{sup 5}He (s-shell). The results are consistent with those of recent theoretical calculations.

• OSTI ID: 20873370
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 842; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR CORRELATION
CARBON 12
FINAL-STATE INTERACTIONS
HELIUM 5
HYPERNUCLEI
KAONS PLUS
LAMBDA BARYONS
NEUTRONS
PION PLUS REACTIONS
PROTONS
TWO-BODY PROBLEM
WEAK HADRONIC DECAY