Spectral Structure of the Pygmy Dipole Resonance
- Tonchev, A. P.
- Hammond, S. L.
- Kelley, J. H.
- Kwan, E.
- Lenske, H.
- Rusev, G.
- Tornow, W.
- Tsoneva, N.
Publication date
January 2010
DOIAbstract
High-sensitivity studies of E1 and M1 transitions observed in the reaction 138Ba(gamma,gamma{'}) at energies below the one-neutron separation energy have been performed using the nearly monoenergetic and 100% linearly polarized photon beams of the HIgammaS facility. The electric dipole character of the so-called "pygmy" dipole resonance was experimentally verified for excitations from 4.0 to 8.6 MeV. The fine structure of the M1 "spin-flip" mode was observed for the first time in N=82 nuclei
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