Abstract
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°. The same reactions, but detecting the neutron-rich ejectiles, have also been studied at a mean angle of 4.5°. Excitation energies for low-lying levels in the two
T
z
=
5
2
nuclei
19N and
21O have been derived. The correspondence between the observed levels and those predicted by 0kh
ω 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 semi-classical reaction model.