ON THE CROSS-SECTIONS OF NUCLEAR ISOMER DE-EXCITATION

摘要

The probability of the ~(180m)Ta isomer depopulation by external radiation has been recently measured in reactions induced by MeV Bremsstrahlung and fast neutrons. Growth of the K-mixing level density with excitation energy is concluded. The excitation of nuclear transitions by sofi photons (x-ray radiation) is currently of interest in view of a γ-ray laser. A modified equation for the cross-section of nuclear isomer depopulation is proposed and applied for understanding recent experimental results on the stimulated decay of the ~(178m2)Hf isomer.