Elsevier

Nuclear Physics A

Volume 247, Issue 2, 4 August 1975, Pages 187-194
Nuclear Physics A

The 208Pb(α, 3He)209Pb reaction at 58 MeV

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Abstract

The 208Pb(α, 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 (2g92) and levels at 0.781 (li112) and 1.426 MeV (lj152). The angular distributions for these levels have been measured and analyzed using standard DWBA calculations to obtain spectroscopic strengths. The 208Pb(α, α) 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 (α, 3He) reaction should easily pick out any appreciable components of the j152 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.

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Work supported in part by the US Atomic Energy Commission.

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