Abstract. The production of K § mesons in proton-nucleus and deuteron-nucleus collisions is analyzed with respect to one-step nucleon-nucleon (NN~NAK +), A-nucleon (AN~NAK+) and two-step pion-nucleon (~N~K § A) production channels on the basis of experimental ground state momentum distributions and free on-shell production processes. Whereas for K § production in proton-nucleus reactions the secondary channel ~N clearly dominates at subthreshold energies, meson and nucleon induced channels are of similar magnitude in deuteron-nucleus reactions. Contrary to nucleus-nucleus collisions the A induced reaction channels are found to be of minor importance. The experimental differentiation of the underlying microscopic reaction channels appears possible via differential proton K § coincidence measurements as shown in detail by the microscopic simulations including proton rescattering.
Abstract. We study the production of A hyperons in p + A reactions within the BUU transport approach including elastic A -N rescattering and extract the A sticking probabilities and hypernucleus formation cross sections as a function of bombarding energy and target mass. At 1.5 GeV about 25% of the A hyperons are found to be bound in case of heavy nuclei like 23SU leading to large cross sections for A-hypernuclei. The respective hypernuclei show broad distributions in excitation energy, momentum and angular momentum. The decay of the A hyperon in case of heavy targets is found to be almost entirely due to nonmesonic decay channels, i.e. AN ~ NN processes.
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