Phys. Rev. Lett. 100, 232501 (2008) [4 pages]Fine Structure of the Pygmy Dipole Resonance in 136XeReceived 21 February 2008; published 11 June 2008 The photoresponse of the semimagic N=82 nucleus 136Xe was measured up to the neutron separation energy Sn using the (γ,γ′) reaction. A concentration of strong dipole excitations is observed well below Sn showing a fragmented resonancelike structure. Microscopic calculations in the quasiparticle phonon model including complex configurations of up to three phonons agree well with the experimental data in the total integrated strength, in the shape and the fragmentation of the resonance, which allows us to draw conclusions on the damping mechanism of the pygmy dipole resonance. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.232501
DOI:
10.1103/PhysRevLett.100.232501
PACS:
25.20.Dc, 21.60.Jz, 24.30.Gd, 27.60.+j
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