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, P. Spagnoletti, D. Savran, and G. S. Simpson
Phys. Rev. Lett. 116, 132501 – Published 30 March 2016

Abstract

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 [J0π=(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.

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  • Received 30 October 2015

DOI:https://doi.org/10.1103/PhysRevLett.116.132501

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

M. Scheck1,2,*, S. Mishev3,4, V. Yu. Ponomarev5, R. Chapman1,2, L. P. Gaffney1,2, E. T. Gregor1,2, N. Pietralla5, P. Spagnoletti1,2, D. Savran6, and G. S. Simpson1,2

  • 1School of Engineering and Computing, University of the West of Scotland, Paisley PA1 2BE, United Kingdom
  • 2SUPA, Scottish Universities Physics Alliance, Glasgow G12 8QQ, United Kingdom
  • 3JINR, Joint Institute for Nuclear Research, Dubna 141980, Russia
  • 4Institute for Advanced Physical Studies, New Bulgarian University, Sofia 1618, Bulgaria
  • 5Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
  • 6ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany

  • *marcus.scheck@uws.ac.uk

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Vol. 116, Iss. 13 — 1 April 2016

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