Investigating the pygmy dipole resonance using β decay

M. Scheck, S. Mishev, V. Yu. Ponomarev, R. Chapman, L. P. Gaffney, E. T. Gregor, N. Pietralla, Pietro Spagnoletti, D. Savran, G. S. Simpson

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In this contribution it is explored whether γ-ray spectroscopy following β decay with high Q values from mother nuclei with low ground-state spin can be exploited as a probe for the pygmy dipole resonance. The suitability of this approach is demonstrated by a comparison between data from photon scattering, Xe136(γ,γ′), and I136 [Jπ0=(1−)]→136Xe∗ β-decay data. It is demonstrated that β decay populates 1− levels associated with the pygmy dipole resonance, but only a fraction of those. The complementary insight into the wave functions probed by β decay is elucidated by calculations within the quasiparticle phonon model. It is demonstrated that β decay dominantly populates complex configurations, which are only weakly excited in inelastic scattering experiments.
Original languageEnglish
Article number132501
JournalPhysical Review Letters
Issue number13
Publication statusPublished - 30 Mar 2016


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