Mesonic and nonmesonic weak decay widths of medium-heavy {lambda} hypernuclei
- Department of Physics, Tohoku University, Sendai 980-8578 (Japan)
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043 (Japan)
- High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801 (Japan)
- Department of Physics, Seoul National University, Seoul 151-742, Korea (Korea, Republic of)
- Graduate School of Science, University of Tokyo, Tokyo 113-0033 (Japan)
- Department of Physics, Seoul National University, Seoul 151-742 (Korea, Republic of)
We have measured the energy spectra of pions and protons emitted in the weak decay of {sup {lambda}}{sub 12}C, {sup {lambda}}{sub 28}Si, and hypernuclei produced via the ({pi}{sup +},K{sup +}) reaction. The decay widths of the {pi}{sup -} mesonic decay ({lambda}{yields}p{pi}{sup -}) and the nonmesonic decay ({lambda}N{yields}NN) were extracted. The present results demonstrate an increase of the mesonic decay width due to a distortion of the pion wave function in nuclear medium for the first time. The ratios of the neutron- to proton-induced nonmesonic decay widths, {gamma}{sub n}({lambda}n{yields}nn)/{gamma}{sub p}({lambda}p{yields}np), were evaluated by a direct comparison of the measured proton energy spectra with the calculated ones. No theoretical calculation which has been proposed so far can simultaneously account for both the nonmesonic decay widths and the {gamma}{sub n}/{gamma}{sub p} ratios in the present data.
- OSTI ID:
- 20695960
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 71, Issue 2; Other Information: DOI: 10.1103/PhysRevC.71.025203; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
Similar Records
Kinetic energy sum spectra in nonmesonic weak decay of hypernuclei
Hypernuclear weak decay of {sup 12}{sub {Lambda}}C and {sup 11}{sub {Lambda}}B