Theoretical study of structure and production of FΛ19 as a gateway to sd-shell hypernuclei

Energy level structures of the typical light sd  -shell hypernucleus FΛ19, together with 18F, 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 19F (K−,π−γK−,π−γ) FΛ19 experiment, the production cross sections have been estimated extensively, including the angular distributions. Starting with the elementary amplitudes for the K−n→Λπ−K−n→Λπ− process, the microscopic DWIA calculations at high energy kaon momenta up to 1.8 GeV/c1.8 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 18F and FΛ19. The detailed γ-decay schemes are presented and discussed.