Isomeric and Ground State Formation in 197Hg by the 197Au (γ,π-)197 Hg Reaction Near Threshold
In γ,π± reactions near threshold that populate in the product nucleus an isomeric state and a radioactive ground state, the ratio of the cross-sections leading to these two states, or isomer ratio, can yield information about the production mode of the emitted photopions. In such reactions, the isomeric and the ground state may he reached directly when the pion is emitted. However, these states can also be reached indirectly via gamma cascades originating from highly excited states in the product nucleus. If the target nucleus is excited to an energy only little above meson emission threshold, one can expect that the fraction of reactions giving rise to such gamma cascades is smaller than at higher excitation energies of the target nucleus.
KeywordsTarget Nucleus Isomeric State Isomer Ratio Gold Foil High Excitation Energy
Unable to display preview. Download preview PDF.
- 1.H. A. Medicus and R. Smalley, Proc. 6th Intern. Conf. on High-Energy Physics and Nuclear Structure, Los Alamos 1975, p. 287.Google Scholar