Target mass dependence of Λ4H formation mechanism from K− absorption at rest

Formation probabilities of Λ4H from K− absorption at rest on light nuclear targets are investigated employing antisymmetrized molecular dynamics combined with multi-step binary statistical decay. Calculated results show that as the target mass number decreases from 16O, 12C to 9Be, the main formation mechanism varies from statistical decay, followed by dynamical fragmentation, to direct formation in nuclear environment.