Mesonic and nonmesonic weak decay widths of medium-heavy {lambda} hypernuclei

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 nonmeson...

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Bibliographic Details
Published in:Physical review. C, Nuclear physics Nuclear physics, 2005-02, Vol.71 (2)
Main Authors: Sato, Y., Takahashi, T., High Energy Accelerator Research Organization, Ajimura, S., Kishimoto, T., Aoki, K., Noumi, H., Omata, K., Outa, H., Sekimoto, M., Shibata, T., Bhang, H., Park, H., Hasegawa, T., Hotchi, H., Ohta, Y., Hashimoto, O., Maeda, K., Kim, Y.D., Youn, M.
Format: Article
Language:English
Subjects:
CARBON 12
COMPARATIVE EVALUATIONS
EMISSION
ENERGY SPECTRA
HYPERNUCLEI
KAONS PLUS
LAMBDA BARYONS
NEUTRONS
NUCLEAR DECAY
NUCLEAR PHYSICS AND RADIATION PHYSICS
PARTICLE DECAY
PION PLUS REACTIONS
PIONS MINUS
PROTONS
SILICON 28
WAVE FUNCTIONS
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Summary: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.
ISSN:0556-2813
1089-490X
DOI:10.1103/PhysRevC.71.025203