STRUCTURE OF AS-74 FROM THE (P,N-GAMMA)-REACTION AND INTERPRETATION WITHIN IBFFM

gamma-ray, internal conversion electron, and gammagamma-coincidence sp ectra of the Ge-74(p,ngamma) As-74 reaction were measured with Ge (HP) gamma-ray and superconducting magnetic lens plus Si(Li) electron spec trometers at five bombarding proton energies between 3.6 and 4.7 MeV. Energies and relative intensities of 171 (among them > 105 new) As-74 gamma-rays, as well as 65 (including 51 new) internal conversion coeff icients have been determined. A more complete level scheme, gamma-ray branching ratios, level spin and parity values have been deduced. The scheme contains 52 levels, from which 18 are new. The energy spectra a nd electromagnetic properties were calculated using the interacting bo son-fermion-fermion model. The calculations reasonably well describe t he level spectra and electromagnetic properties of Ge-72, As-73, Ge-73 and As-74 nuclei.