title: Investigating the Pygmy Dipole Resonance Using β Decay.
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, ^{136}Xe(γ,γ^{'}), and ^{136}I [J_{0}^{π}=(1^{-})]→^{136}Xe^{*} 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.
authors.affiliation: School of Engineering and Computing, University of the West of Scotland, Paisley PA1 2BE, United Kingdom.|SUPA, Scottish Universities Physics Alliance, Glasgow G12 8QQ, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Scheck
authors.affiliation: JINR, Joint Institute for Nuclear Research, Dubna 141980, Russia.|Institute for Advanced Physical Studies, New Bulgarian University, Sofia 1618, Bulgaria.
authors.forename: S
authors.initials: S
authors.lastname: Mishev
authors.affiliation: Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
authors.forename: V Yu
authors.initials: VY
authors.lastname: Ponomarev
authors.affiliation: School of Engineering and Computing, University of the West of Scotland, Paisley PA1 2BE, United Kingdom.|SUPA, Scottish Universities Physics Alliance, Glasgow G12 8QQ, United Kingdom.
authors.forename: R
authors.initials: R
authors.lastname: Chapman
authors.affiliation: School of Engineering and Computing, University of the West of Scotland, Paisley PA1 2BE, United Kingdom.|SUPA, Scottish Universities Physics Alliance, Glasgow G12 8QQ, United Kingdom.
authors.forename: L P
authors.initials: LP
authors.lastname: Gaffney
authors.affiliation: School of Engineering and Computing, University of the West of Scotland, Paisley PA1 2BE, United Kingdom.|SUPA, Scottish Universities Physics Alliance, Glasgow G12 8QQ, United Kingdom.
authors.forename: E T
authors.initials: ET
authors.lastname: Gregor
authors.affiliation: Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
authors.forename: N
authors.initials: N
authors.lastname: Pietralla
authors.affiliation: School of Engineering and Computing, University of the West of Scotland, Paisley PA1 2BE, United Kingdom.|SUPA, Scottish Universities Physics Alliance, Glasgow G12 8QQ, United Kingdom.
authors.forename: P
authors.initials: P
authors.lastname: Spagnoletti
authors.affiliation: ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Savran
authors.affiliation: School of Engineering and Computing, University of the West of Scotland, Paisley PA1 2BE, United Kingdom.|SUPA, Scottish Universities Physics Alliance, Glasgow G12 8QQ, United Kingdom.
authors.forename: G S
authors.initials: GS
authors.lastname: Simpson