Low-energy dipole strength in Sn112,120

B. Özel-Tashenov, J. Enders, H. Lenske, A. M. Krumbholz, E. Litvinova, P. von Neumann-Cosel, I. Poltoratska, A. Richter, G. Rusev, D. Savran, and N. Tsoneva
Phys. Rev. C 90, 024304 – Published 11 August 2014

Abstract

The Sn112,120(γ,γ) reactions below the neutron separation energies have been studied at the superconducting Darmstadt electron linear accelerator S-DALINAC for different endpoint energies of the incident bremsstrahlung spectrum. Dipole strength distributions are extracted for Sn112 up to 9.5 MeV and for Sn120 up to 9.1 MeV. A concentration of dipole excitations is observed between 5 and 8 MeV in both nuclei. Missing strength due to unobserved decays to excited states is estimated in a statistical model. A fluctuation analysis is applied to the photon scattering spectra to extract the amount of the unresolved strength hidden in the background due to fragmentation. The strength distributions are discussed within different model approaches such as the quasiparticle-phonon model and the relativistic time blocking approximation, allowing for an inclusion of complex configurations beyond the initial particle-hole states. While a satisfactory description of the fragmentation can be achieved for sufficiently large model spaces, the predicted centroids and total electric dipole strengths for stable tin isotopes strongly depend on the assumptions about the underlying mean field.

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  • Received 5 June 2014
  • Revised 6 July 2014

DOI:https://doi.org/10.1103/PhysRevC.90.024304

©2014 American Physical Society

Authors & Affiliations

B. Özel-Tashenov1,2, J. Enders1, H. Lenske3, A. M. Krumbholz1, E. Litvinova4,5, P. von Neumann-Cosel1,*, I. Poltoratska1, A. Richter1, G. Rusev6, D. Savran7,8, and N. Tsoneva3,9

  • 1Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
  • 2Faculty of Science and Letters, Nigde University, 05005 Nigde, Turkey
  • 3Institut für Theoretische Physik, Justus-Liebig Universität Gießen, D-35392 Gießen, Germany
  • 4Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008-5252, USA
  • 5NSCL, Michigan State University, Michigan 48824, USA
  • 6Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 7ExtreMe Matter Institute and Research Devision, GSI, D-64291 Darmstadt, Germany
  • 8Frankfurt Institute for Advanced Studies (FIAS), D-60438 Frankfurt am Main, Germany
  • 9Institute of Nuclear Research and Nuclear Energy, 1784 Sofia, Bulgaria

  • *vnc@ikp.tu-darmstadt.de

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Vol. 90, Iss. 2 — August 2014

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