New observables on the mesonic decay of light Λ hypernuclei with A=4 (Λ4H and Λ4He) are directly measured by using 4He (Kstopped-,π-) reaction: 1) The lifetime of Λ4H is measured as 194-26+24 ps, 2) The π° decay branching ratio of Λ4He is determined as 51.5±3.5%. Incorporating the results of bubble chamber experiments, partial mesonic decay widths of Λ4H and Λ4He are derived and they are compared with recent theoretical estimates. Our results favors ΛN interaction with inner repulsive core.
ASJC Scopus subject areas
- Nuclear and High Energy Physics