Isomer ratios for products of photonuclear reactions with middle-weight nuclei

Abstract

The isomer ratios for nuclei 104m,g Ag, 110m,g In, 108m,g In as products of the photonuclear reactions 107Ag(γ, 3n)104m,g Ag, 113In(γ, 3n)110m,g In, 109Ag(γ, 5n)104m,g Ag, 115In)(γ, 5n)110m,g In, 115In(γ, 7n)108m,g In are obtained. The Bremsstrahlung of electrons with energies within 32–84 MeV from the LU-40 linear accelerator was used for the irradiation of targets. The energy resolution and mean current of the electron beam were ∼1% and 5 μA, respectively. The induced activity was used to obtain experimental isomer ratios. An HPGe spectrometer with an energy resolution of 1.9 keV for 60Co γ-line 1332 keV was used to acquire the instrumental γ-ray spectra of the activation products. A set of serial measurements with various acquisition times was performed. The cooling times varied from 5 seconds to several hours for Ag and up to tens of hours for In specimens. The obtained experimental isomer ratios are compared with the results from theoretical calculations.