Dipole strength in La139 below the neutron-separation energy

A. Makinaga, R. Schwengner, G. Rusev, F. Dönau, S. Frauendorf, D. Bemmerer, R. Beyer, P. Crespo, M. Erhard, A. R. Junghans, J. Klug, K. Kosev, C. Nair, K. D. Schilling, and A. Wagner
Phys. Rev. C 82, 024314 – Published 16 August 2010

Abstract

The γ-ray strength function is an important input quantity for the determination of the photoreaction rate and the neutron capture rate for astrophysics as well as for nuclear technologies. To test model predictions, the photoabsorption cross section of La139 up to the neutron-separation energy was measured using bremsstrahlung produced at the electron accelerator ELBE of Forschungszentrum Dresden-Rossendorf with an electron beam of 11.5 MeV kinetic energy. The experimental data were analyzed by applying Monte Carlo simulations of γ-ray cascades to obtain the intensities of the ground-state transitions and their branching ratios. We found a significant enhancement of electric dipole strength in the energy range from 6 to 10 MeV that may be related with a pygmy dipole resonance. The present data are combined with photoneutron cross sections for La139 and compared with results of calculations on the basis of a quasiparticle-random-phase approximation using an instantaneous-shape sampling.

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  • Received 4 June 2010

DOI:https://doi.org/10.1103/PhysRevC.82.024314

©2010 American Physical Society

Authors & Affiliations

A. Makinaga1,*, R. Schwengner2, G. Rusev3, F. Dönau2, S. Frauendorf2,4, D. Bemmerer2, R. Beyer2, P. Crespo2,†, M. Erhard2,‡, A. R. Junghans2, J. Klug2,§, K. Kosev2, C. Nair2,∥, K. D. Schilling2, and A. Wagner2

  • 1Department of Physics, Konan University, Okamoto 8-9-1, Higashinada, Kobe 658-8501, Japan
  • 2Institut für Strahlenphysik, Forschungszentrum Dresden-Rossendorf, D-01314 Dresden, Germany
  • 3Department of Physics, Duke University, and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA
  • 4Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA

  • *Present address: Hokkaido University, Sapporo 060-0810, Japan.
  • Present address: LIP, Physics Department, University of Coimbra, P-3004-516 Coimbra, Portugal.
  • Present address: INFN, Sezione di Padova, I-35131 Padova, Italy.
  • §Present address: Vattenfall Power Consultant, S-16216 Stockholm, Sweden.
  • Present address: Nuclear Engineering Division, Argonne National Laboratory, Argonne, IL 60439.

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Issue

Vol. 82, Iss. 2 — August 2010

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