Abstract
The reaction 38Ar( alpha ,p gamma )41K was used to populate levels up to 3.3 MeV excitation in 41K. Solid 38Ar targets were used. Gamma-ray angular distributions and linear polarisations were measured at alpha-particle energies of 9.50 and 10.75 MeV. Analysis of these data yielded spin and parity assignments of Jpi =3/2+, 3/2-, 7/2+, 5/2+, 5/2-, 9/2+, 7/2+, 11/2+, 11/2- and 13/2+ for levels at 1560, 1582, 1677, 1698, 2317, 2495, 2509, 2528, 2761 and 2774 keV. Gamma-ray multipole mixing ratios were deduced for many transitions and several branching ratios were measured. A simple shell-model calculation was carried out in an attempt to clarify the structure of positive-parity states.