Yu. M. Ranyuk | Searcharxiv

arXiv2006

Excitation of low-lying state by E3 transition in reaction with real photons

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.

nucl-ex↗

arXiv1998

Polarization of the Tagged Compton Backscattered Laser Photons. Results of Monte Carlo Simulation

Polarization characteristics of the gamma beam obtained by the Compton back scattering of laser photons on high energy electrons are evaluated by Monte-Carlo simulations. It is assumed that outgoing photons are tagged; the energy dispersion of the tagging photons and emittance of the initial electrons are taken into account. Dependence of the final photon polarization parameters on measured photon energy is obtained. It is shown that polarization of final photons is decreasing with change for the worth of the tagging energy resolution. Calculations have been applied for the storage ring SIBERIA-2 at Kurchatov Institute. The obtained results indicate a reasonability for construction of gamma-polarimeters on existing and planned facilities for the on-line measurement of the final photon beam polarization.

physics.ins-det↗