The 208Pb([alpha], 3He)209Pb reaction at 58 MeV

Abstract

The 208Pb([alpha], 3He)209Pb reaction at 58 MeV has been used to search for high-spin states in 209Pb. Only three levels are excited with appreciable intensity: the ground state and levels at . The angular distributions for these levels have been measured and analyzed using standard DWBA calculations to obtain spectroscopic strengths. The 208Pb([alpha], [alpha]) elastic scattering was measured and optical parameters deduced from the data. A normalization value N = 50 yields spectroscopic values which are close to the values measured in the (d, p) reaction. The ([alpha], 3He) reaction should easily pick out any appreciable components of the shell model state, which weak-coupling calculations predict should be fragmented. However only three weak transitions previously seen in a (d, p) experiment are observed.