Abstract

New experimental results on photo-excitation of the Cd and In spin isomers by real and virtual photons (electrons) in the threshold energy region are presented. Measurements have been performed using the INR electron linac LUE—8 MeV and, in parallel, the femtosecond laser facility of the Moscow State University. A detailed description of experimental methods based on the GEANT-4 simulation is done. The obtained data are discussed in frame of the phenomenological model which allows the theoretical evaluation of the isomeric ratio in this energy region. Contribution of the dipole and quadrupole mode excitations in Cd and In nuclei from measurements with real and virtual photons is discussed.

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