Coulomb Excitation of Elements of Medium and Heavy Mass

Abstract

Yields of gamma rays from thick targets of In, ${\mathrm{I}}^{127}$, ${\mathrm{Ta}}^{181}$, ${\mathrm{Re}}^{185,187}$, ${\mathrm{Ir}}^{191,193}$, ${\mathrm{Hg}}^{198,199,200,202}$, Th, and U were investigated under proton or alpha-particle bombardment in the energy range 2 to 4 Mev. By using the theory for electric excitation, reduced matrix elements for all electrically excited radiations were computed and compared with single-particle estimates. The results are interpreted in terms of the strong-coupling collective model of Bohr and Mottelson and compared with the systematic trends in the region of the closed shell at 126 neutrons.