Pygmy dipole strength in 86Kr and systematics of N=50 isotones

R. Schwengner, R. Massarczyk, G. Rusev, N. Tsoneva, D. Bemmerer, R. Beyer, R. Hannaske, A. R. Junghans, J. H. Kelley, E. Kwan, H. Lenske, M. Marta, R. Raut, K. D. Schilling, A. Tonchev, W. Tornow, and A. Wagner
Phys. Rev. C 87, 024306 – Published 8 February 2013

Abstract

The dipole strength of the N=50 nucleus 86Kr was studied in photon-scattering experiments using bremsstrahlung produced with electron beams of energies of 7.9 and 11.2 MeV delivered by the linear accelerator ELBE as well as using quasimonoenergetic and linearly polarized γ rays of 10 energies within the range from 4.7 to 9.3 MeV delivered by the HIγS facility. A high-pressure gas target was used. We identified 39 levels up to an excitation energy of 10.1 MeV. Simulations of γ-ray cascades were performed to estimate intensities of inelastic transitions and to correct the intensities of the ground-state transitions for their branching ratios. The photoabsorption cross section derived in this way up to the neutron-separation energy is combined with the photoabsorption cross section obtained from a (γ,n) experiment at HIγS. The enhanced E1 strength found in the range from 6 to 10 MeV is compared with the ones in the N = 50 isotones 88Sr, 90Zr, and 92Mo and with predictions of calculations within the quasiparticle-phonon model.

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  • Received 26 November 2012

DOI:https://doi.org/10.1103/PhysRevC.87.024306

©2013 American Physical Society

Authors & Affiliations

R. Schwengner1, R. Massarczyk1,2, G. Rusev3,4,*, N. Tsoneva5,6, D. Bemmerer1, R. Beyer1, R. Hannaske1,2, A. R. Junghans1, J. H. Kelley4,7, E. Kwan3,4,†, H. Lenske5, M. Marta1,‡, R. Raut3,4,§, K. D. Schilling1, A. Tonchev3,4,†, W. Tornow3,4, and A. Wagner1

  • 1Institut für Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
  • 2Technische Universität Dresden, 01062 Dresden, Germany
  • 3Department of Physics, Duke University, Durham, North Carolina 27708, USA
  • 4Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA
  • 5Institut für Theoretische Physik, Universität Gießen, 35392 Gießen, Germany
  • 6Institute for Nuclear Research and Nuclear Energy, BAS, 1784 Sofia, Bulgaria
  • 7Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA

  • *Present address: Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Present address: Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
  • Present address: GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • §Present address: UGC-DAE Consortium for Scientific Research, Kolkata Centre LB-8 Sector-III Bidhannagar, Kolkata 700098, India.

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Vol. 87, Iss. 2 — February 2013

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