Study of 19N and 21O by multinucleon transfer

The multinucleon transfer reactions 18O(18O,17F)19N and 18O(18O,15O)21O have been studied at a beam energy of 117 MeV and a mean reaction angle of 10 deg.. The same reactions, but detecting the neutron-rich ejectiles, have also been studied at a mean angle of 4.5 deg. . Excitation energies for low-lying levels in the two Tz= 5/2 nuclei 19N and 21O have been derived. The correspondence between the observed levels and those predicted by 0κω shell model calculations is discussed. The proposed level assignments are deduced by analogy with results from the 16O(18O,17F)17N and 16O(18O,15O)19O reactions, which were also studied in the present work, and are supported by calculations employing a semiclassical reaction model. 31 refs., 12 figs., 3 tabs