$\Lambda d$ correlations from the $^4$He(stopped-$K^-$,$d$) reaction

We have observed an intense high-energy component in an inclusive He-4(stopped K-, d) spectrum. For back-to-back Lambda d pairs a prominent event cluster has been found just below the m(4He) + m(K)(-) -m(n) mass threshold in the Lambda d invariant mass spectrum of Lambda dn events, which is evidence for a three-nucleon absorption process of K- in He-4. In addition, an appreciable strength is revealed below similar to 3220 MeV/c(2). Well separated Sigma(0)dn events show a peak similar to the case of Lambda dn.