PRODUCTION OF DOUBLE-LAMBDA HYPEMUCLEI AT (K-,K+) REACTION POINTS ANDTHEIR PIONIC DECAYS

Starting with the (K-, K+) reaction on nuclear targets of mass number 9-12 (Be-9, B-10, B-11, C-12), the probabilities of producing double-L ambda and single-Lambda hyperfragments at the reaction points have bee n evaluated on the basis of the statistical model. First, the Xi parti cle produced abundantly in the quasi-free region is shown to be well a bsorbed into the nucleus through the Xi slowdown by knocking out a nuc leon, Then the formation of a double-Lambda compound nuclear system is assumed together with its subsequent breaking-up into various hyperfr agments. The theoretical pion spectra are presented for the weak decay s of the double-Lambda and single-Lambda hypernuclei produced efficien tly in this scenario, which can be utilized for the identification of their hyperfragments production, It proposed that the observation of L ambda Lambda(5)H with the Be-9 target is most feasible and promising. (C) 1997 Elsevier Science B.V.