Mesonic and non-mesonic decay widths ofΛ4H andΛ4He

✍ Scribed by H. Outa; M. Aoki; R.S. Hayano; T. Ishikawa; M. Iwasaki; A. Sakaguchi; E. Takada; H. Tamura; T. Yamazaki

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 689 KB
• Volume: 639
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(98)00281-4

✦ Synopsis

Results are reported on precise measurements of the weak-decay processes of :H and :He hypernuclei formed via the 4He(K,t,pped, 7~) reaction. The lifetimes of iH (194+;: ps) and ;He (256 & 27 ps) were obtained. The x0 and F decay branching ratios of ;He (0.515 ho.035 and 0.322f0.034, respectively) were precisely determined and they are compared with recent theoretical estimates and related experimental values. Our results favor a A-nucleus interaction with an inner repulsive core. The non-mesonic weak decay widths of ;H and IHe are reexamined on the basis of our measurements and updated knowledge of the mesonic decay processes. It is found that the non-mesonic decay of :He predominantly takes place via the A + p + n + p process.