Strangeness exchange reactions with the recoil corrected continuum shell model

Abstract

The procedure for calculating strangeness exchange cross sections in the recoil corrected continuum shell model formalism is developed. Cross sections are compared with existing 12 ΛC, 16 ΛO and 40 ΛCa data and agreement is good. The calculated 16 ΛO, 4° spectrum demonstrated the ability of the RCCSM to calculated bound states, resonances, and quasi-free scattering in one formalism. A search for collective states was performed. After proper removal of center-of-mass excitations, no substantial collectivity was found. A survey of stretched excitations was performed. The 16 ΛO(3 +) and 28 ΛSi(5 +) states were found to be narrow and contain more than 85% of the 1p Λ 1h n strength. They are therefore, good candidates for initial (γ, K +) studies. In contrast, only 50% of the 1p Λ 1h n strength for 12 ΛC(3 +) will be observed in one state, with the remaining strength spread over several MeV with weak structure.