A hole-vibration quadruplet in 39K

Gamma-ray angular distribution measurements at several 38Ar(p,γ)39K resonances yield the spins J=5/2 and 7/2 for the Esub(x)=3.88 and 4.13 MeV levels of 39K, respectively. The assignments are in line with the interpretation of these two levels as members of a hole-vibration quadruplet in 39K. Results of a shell-model calculation are presented which support this interpretation. Byproducts of this investigation are the decay schemes of sixteen 38Ar(p,γ)39K resonances, the assignments Jsup(π)=5/2+, 5/2+, 7/2-, 5/2+, 3/2sup((-)), 3/2- and 9/2+ to the 39K levels at Esub(x)=4.51, 4.74, 5.89, 7.87, 7.99, 8.09 and 8.10 MeV and the mean lifetimes tausub(m)=85+-20, 22+-5, 9+-2 and <5 fs for the levels at Esub(x)=2.52, 3.02, 3.88 and 5.26 MeV, respectively. (orig.)