• Open Access

Dipole response of 76Se above 4 MeV

P. M. Goddard, N. Cooper, V. Werner, G. Rusev, P. D. Stevenson, A. Rios, C. Bernards, A. Chakraborty, B. P. Crider, J. Glorius, R. S. Ilieva, J. H. Kelley, E. Kwan, E. E. Peters, N. Pietralla, R. Raut, C. Romig, D. Savran, L. Schnorrenberger, M. K. Smith, K. Sonnabend, A. P. Tonchev, W. Tornow, and S. W. Yates
Phys. Rev. C 88, 064308 – Published 6 December 2013

Abstract

The dipole response of 3476Se in the energy range from 4 to 9 MeV has been analyzed using a (γ,γ) polarized photon scattering technique, performed at the High Intensity γ-Ray Source facility at Triangle Universities Nuclear Laboratory, to complement previous work performed using unpolarized photons. The results of this work offer both an enhanced sensitivity scan of the dipole response and an unambiguous determination of the parities of the observed J=1 states. The dipole response is found to be dominated by E1 excitations, and can reasonably be attributed to a pygmy dipole resonance. Evidence is presented to suggest that a significant amount of directly unobserved excitation strength is present in the region, due to unobserved branching transitions in the decays of resonantly excited states. The dipole response of the region is underestimated when considering only ground state decay branches. We investigate the electric dipole response theoretically, performing calculations in a three-dimensional (3D) Cartesian-basis time-dependent Skyrme-Hartree-Fock framework.

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  • Received 17 June 2013

DOI:https://doi.org/10.1103/PhysRevC.88.064308

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Authors & Affiliations

P. M. Goddard1,2, N. Cooper2, V. Werner2, G. Rusev3,4,*, P. D. Stevenson1, A. Rios1, C. Bernards2, A. Chakraborty5, B. P. Crider5, J. Glorius6, R. S. Ilieva1,2, J. H. Kelley4,7, E. Kwan3,4,†, E. E. Peters5, N. Pietralla6, R. Raut3,4,‡, C. Romig6, D. Savran8,9, L. Schnorrenberger6, M. K. Smith2, K. Sonnabend6,10, A. P. Tonchev3,4,§, W. Tornow3,4, and S. W. Yates5

  • 1Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom
  • 2A. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, USA
  • 3Duke University, Durham, North Carolina 27708-0308, USA
  • 4Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA
  • 5Departments of Chemistry and Physics & Astronomy, University of Kentucky, Lexington, Kentucky, 40506, USA
  • 6Institut für Kernphysik, TU Darmstadt, Schlossgartenstraße 9, D-64289 Darmstadt, Germany
  • 7Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA
  • 8ExtreMe Matter Institute and Research Devision, GSI, Planckstraße 1, 64291 Darmstadt, Germany
  • 9Frankfurt Institute for Advanced Studies, Ruth-Moufang-Straße 1, 60438 Frankfurt, Germany
  • 10Goethe Universitt Frankfurt, 60438 Frankfurt am Main, Germany

  • *Present address: Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Present address: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
  • Present address: UGC-DAE Consortium for Scientific Research, Kolkata Centre LB-8 Sector-III Bidhannagar, Kolkata 700098, India.
  • §Present address: Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA.

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Vol. 88, Iss. 6 — December 2013

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