title: Spectral structure of the pygmy dipole resonance.
abstract: 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.
authors.affiliation: Duke University, Durham, North Carolina 27708-0308, USA.
authors.forename: A P
authors.initials: AP
authors.lastname: Tonchev
authors.forename: S L
authors.initials: SL
authors.lastname: Hammond
authors.forename: J H
authors.initials: JH
authors.lastname: Kelley
authors.forename: E
authors.initials: E
authors.lastname: Kwan
authors.forename: H
authors.initials: H
authors.lastname: Lenske
authors.forename: G
authors.initials: G
authors.lastname: Rusev
authors.forename: W
authors.initials: W
authors.lastname: Tornow
authors.forename: N
authors.initials: N
authors.lastname: Tsoneva