Dipole excitations in the semi-magic nucleus V-51 studied with the (gamma,gamma ')reaction

We report on a nuclear resonance fluorescence experiment on the semi-magic odd-mass fp-shell nucleus V-51. The detected dipole strength distribution i s discussed on the basis of modern shell-model calculations employing a mod el space allowing for excitations of protons and neutrons from the 1f(7/2) to the (2 p(1/2),2p(3/2),1f(5/2)) shells. The calculations indicate that th e main body of transitions is of magnetic dipole type, and they are capable of reproducing the observed distribution well. Possible electric dipole an d quadrupole contributions are also discussed. (C) 1999 Elsevier Science B. V. All rights reserved.