Measurement of conversion electrons with thePb208(p,n)Bi208reaction and derivation of the shell model proton neutron hole interaction from the properties ofBi208

Abstract

Conversion electrons from Bi208 have been measured using singles and coincidence techniques with the Pb208(p,n)Bi208 reaction at 9 MeV. The new information on multipolarities and spins complements that available from recent γ-γ-coincidence studies with the same reaction [Boutachkov, Nucl. Phys. A768, 22 (2006)]. The results on electromagnetic decays taken together with information on spectroscopic factors from earlier single-particle transfer reaction measurements represent an extensive data set on the properties of the one-proton one-neutron-hole states below 3 MeV, a spectrum which is virtually complete. Comparison of the experimental observables, namely, energies, spectroscopic factors, and γ-branching ratios, with those calculated within the shell model allows extraction of the matrix elements of the shell model residual interaction. More than 100 diagonal and nondiagonal elements can be determined in this way, through a least squares fit to the experimental data. This adjustment of the interaction significantly affects the calculated properties of the γ-ray transitions. Nevertheless, the matrix elements thus obtained are remarkably similar to those of a realistic interaction calculated from free-nucleon scattering. Characteristic features of the interaction are discussed.