Theoretical study of structure and production of F-19(Lambda) as a gateway to sd-shell hypernuclei

摘要

Energy level structures of the typical light sd-shell hypernucleus F-19(Lambda), together with F-18, have been studied in detail with the multi-configuration shell model. Both positive-parity and negative-parity nuclear core excitations are fully taken into account by removing the spurious center-of-mass excitation effects. Corresponding to the J-PARC proposal of the F-19 (K-, pi(-) gamma) F-19(Lambda) experiment, the production cross sections have been estimated extensively, including the angular distributions. Starting with the elementary amplitudes for the K- n -> Lambda pi(-) process, the microscopic DWIA calculations at high energy kaon momenta up to 1.8 GeV/c have been carried out for the first time. The calculated wave functions are also used to estimate the electromagnetic transition probabilities for both F-18 and F-19(Lambda). The detailed gamma-decay schemes are presented and discussed. (C) 2016 Elsevier B.V. All rights reserved.