Quadrupole transitions in 124Sn by means of the (α, α' γ) reaction

We report on an experiment at the KVI in Groningen using the AGOR facility, the magnetic spectrometer BBS, and HPGe detectors. The excitation and decay energies of the semi-magic nucleus 124Sn have been measured in coincidence by means of the (α,α' γ) reaction at Eα=136 MeV. We closely looked at hadronic reactions, especially considering inelastic scattering. Because strong quadrupole transitions into the ground state could be observed, we focus in this work on the decay of 2+ states by γ-ray emission. We were able to determine the double-differential cross sections as well as the single α-scattering cross sections for almost all known 2+ states up to the particle threshold in 124Sn. In addition, we observed possible new branchings.