Proton removal from 73,75Br to 72,74Se at intermediate energies

We report experimental data for excited states of 72,74Se obtained from proton removal from 73,75Br secondary beams on a proton target. The experiments were performed with the Ursinus-NSCL liquid hydrogen target and the combined GRETINA+S800 setup at the Coupled Cyclotron Facility of the National Superconducting Cyclotron Laboratory at Michigan State University. Within uncertainties, the inclusive cross sections for proton removal from 73,75Br on a proton target are identical suggesting that the same single -particle orbitals contribute to the proton -removal reaction. In addition, details of the partial cross section fragmentation are discussed. The data might suggest that l = 1, 2, 3, and 4 angular momentum transfers are important to understand the population of excited states of 72,74Se in proton removal. Available data for excited states of 74Ge populated through the 75As(d, 3He)74Ge proton -removal reaction in normal kinematics suggest indeed that the fp and sd shell as well as the 1g9/2 orbital contribute. A comparison to data available for odd -A nuclei supports that the bulk of the spectroscopic strengths could be found at lower energies in the even -even Se isotopes than in, for instance, the even -even Ge isotopes. In addition, the population of high -J states seems to indicate that multistep processes contribute to proton -removal reactions at intermediate energies in these collective nuclei.