Spectral structure of the pygmy dipole resonance.
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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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Tonchev, AP, SL Hammond, JH Kelley, E Kwan, H Lenske, G Rusev, W Tornow, N Tsoneva, et al. (2010). Spectral structure of the pygmy dipole resonance. Phys Rev Lett, 104(7). p. 072501. 10.1103/PhysRevLett.104.072501 Retrieved from https://hdl.handle.net/10161/4292.
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Scholars@Duke
Anton P. Tonchev
Werner Tornow
Professor Werner Tornow became the Director of TUNL in July, 1996. He is primarily interested in studying few-nucleon systems with special emphasis on two-nucleon systems and three-nucleon force effects in three-nucleon systems. Polarized beams and polarized targets are essential in this work. He collaborates with the leading theoreticians in his field to interpret the experimental data obtained at TUNL. He recently became involved in weak-interaction physics, especially in double-beta decay studies and in neutrino oscillation physics using large scale detectors at the Kamland project in Japan.
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