Theoretical Analyses of Production and Weak Decay of Hypernuclei with Strangeness=-2

点击翻译按钮获取中文摘要

Starting with the (K^-, K^+) reaction on nuclear targets of mass number 9-12, the probabilities of producing double-LAMBDA and single-LAMBDA hyperfragments at the reaction points have been evaluated on the basis of the statistical model. First, the XI particle produced abundantly in the quasi-free region is shown to be well absorbed into the nucleus through the XI slowdown by knocking out a nucleon. Then the formation of a double-lambda compaound nuclear system is assumed together with its subsequent breaking-up into various hyperfragments. Theoretical pion spectra are presented for the weak decays of the double-lambda and single-LAMBDA hypernuclei produced efficiently in this scinario, which can be utilized for the identification of their hyperfragments production. it is proposed that the observation of <LAMBDALAMBDA>^^^ He with the ^9Be target is most feasible and promising. Mesonic decay spectra for the other p-shell double-LAMBDA hypernuclei have been systematically calculated.