Article,

The photoresponse of stable N=82 nuclei below 10 MeV

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Nuclear Physics A, (November 2006)
DOI: 10.1016/j.nuclphysa.2006.08.012

Abstract

High resolution photon scattering experiments were performed at the 10 MeV bremsstrahlung facility of the electron accelerator S-DALINAC at TU Darmstadt to investigate the semi-magic N = 82 nuclei Ba-138. Ce-140, Nd-142 and Sm-144. Energies and absolute strengths of dipole transitions below 10 MeV were determined in a model independent way. A concentration of electric dipole excitations exhausting up to 1\% of the isovector El energy weighted sum rule is observed in all four nuclei around 6.5 MeV. Calculations in the framework of the Quasiparticle-Phonon Model (QPM) reproduce the gross experimental features. (c) 2006 Elsevier B.V. All rights reserved.

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