Quantum fluctuation effects on hyperfragment formation from Xi(-) absorption at rest on C-12

Formation mechanisms of single, twin and double hypernuclei from Xi absorpt ion at rest on C-12 are investigated with a refined microscopic transport m odel that incorporates the recently developed quantal Langevin treatment in to antisymmetrized molecular dynamics. With a choice of the fluctuation str ength that describes dynamical fragmentation processes in the p + C-12 reac tion at 45 MeV quite well, the quantum fluctuations suppress the formation probability of double hyperfragments to around 10%, which is comparable to the experimental data, and the dynamical formation of twin hyperfragment ca n be described qualitatively.