HYPERNUCLEAR WEAK DECAY OF C-12(LAMBDA) AND B-11(LAMBDA)

Citation
H. Noumi et al., HYPERNUCLEAR WEAK DECAY OF C-12(LAMBDA) AND B-11(LAMBDA), Physical review. C. Nuclear physics, 52(6), 1995, pp. 2936-2945
Citations number
52
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Nuclear
ISSN journal
0556-2813
Volume
52
Issue
6
Year of publication
1995
Pages
2936 - 2945
Database
ISI
SICI code
0556-2813(1995)52:6<2936:HWDOCA>2.0.ZU;2-S
Abstract
The branching ratios of negative pions and protons due to the weak dec ays of C-12(Lambda) and B-11(Lambda) hypernuclei were measured. The ne gative pionic decay rates (Gamma(pi-)), proton-induced nonmesonic deca y rates (Gamma(p)), total nonmesonic decay rates (Gamma(nm), and ratio s of the Lambda n-->nn process to the Lambda p-->pn process (Gamma(n)/ Gamma(p)) were derived from the present measurements combined with pre vious studies on the mesonic pi(0) and total decay rates. The measured Gamma(pi-) shows that Pauli blocking is less effective than expected due to pion distortion. We found that Gamma(nm) is nearly equal to uni ty in units of the free-space Lambda-decay width. The present results also indicate that Gamma(n) is almost twice that of Gamma(p). This is in disagreement with calculations based on meson-exchange models in wh ich Gamma(n) is strongly suppressed.