Excitation of low-lying state by E3 transition in reaction with real photons
O. S. Shevchenko, Yu. M. Ranyuk, A. M. Dovbnya, V. I. Noga, E. L. Kuplennikov, A. A. Nemashkalo, I. G. Goncharov, V. N. Borisenko, V. Yu. Ponomarev
Abstract
The yield of the isomeric state 117mSn (Eiso = 314.58 keV) has been measured in (gamma, gamma') reaction by activation method with the bremsstrahlung end-point energy from 2.1 to 3.0 MeV. Only one intermediate state (IS) responsible for the isomer feeding has been found. The excitation energy of the IS (2.25 +/- 0.05) MeV and photoproduction integral cross section (0.022 +/- 0.002) eV b have been deduced. Microscopic calculations within the Quasiparticle-phonon model have been performed to learn on the IS structure. We conclude that the IS is excited in the present experiment by the E3-transition.
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