Verification of detailed balance for γ absorption and emission in Dy isotopes

T. Renstrøm, H. Utsunomiya, H. T. Nyhus, A. C. Larsen, M. Guttormsen, G. M. Tveten, D. M. Filipescu, I. Gheorghe, S. Goriely, S. Hilaire, Y.-W. Lui, J. E. Midtbø, S. Péru, T. Shima, S. Siem, and O. Tesileanu
Phys. Rev. C 98, 054310 – Published 16 November 2018

Abstract

The photoneutron cross sections of Dy162,163 have been measured for the first time in an energy region from the neutron threshold (Sn) up to 13MeV. The (γ,n) reaction was induced with quasimonochromatic laser Compton-scattered γ rays, produced at the NewSUBARU laboratory. The corresponding γ-ray strength functions (γSF) have been calculated from the photoneutron cross sections. The data are compared to reanalyzed γSFs of Dy160164, which are measured below Sn. The excellent agreement with the photoneutron data at Sn confirms the principle of detailed balance. Thus, a complete γSF is established covering in total the energy region of 1Eγ13 MeV. These mid-shell well-deformed dysprosium isotopes all show scissors resonances with very similar structures. We find that our data predict the same integrated scissors strength as (γ,γ) data when integrated over the same energy range, which shows that the scissors mode very likely is consistent with the generalized Brink hypothesis. Finally, using the γSFs as input in the reaction code talys, we have deduced radiative neutron-capture cross sections and compared them to direct measurements. We find a very good agreement within the uncertainties, which gives further support to the experimentally determined γSFs.

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  • Received 17 February 2018

DOI:https://doi.org/10.1103/PhysRevC.98.054310

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

T. Renstrøm1,*, H. Utsunomiya2, H. T. Nyhus1, A. C. Larsen1, M. Guttormsen1, G. M. Tveten1, D. M. Filipescu3,4, I. Gheorghe3,4, S. Goriely5, S. Hilaire6, Y.-W. Lui7, J. E. Midtbø1, S. Péru6, T. Shima8, S. Siem1, and O. Tesileanu9

  • 1Department of Physics, University of Oslo, N-0316 Oslo, Norway
  • 2Department of Physics, Konan University, Okamoto 8-9-1, Higashinada, Kobe 658-8501, Japan
  • 3Extreme Light Infrastructure - Nuclear Physics, “Horia Hulubei” National Institute for Physics and Nuclear Engineering (IFIN-HH), 30 Reactorului, 077125 Bucharest-Magurele, Romania
  • 4“Horia Hulubei” National Institute for Physics and Nuclear Engineering (IFIN-HH), 30 Reactorului, 077125 Bucharest-Magurele, Romania
  • 5Institut d'Astronomie et d'Astrophysique, Université Libre de Bruxelles, Campus de la Plaine, CP-226, 1050 Brussels, Belgium
  • 6CEA, DAM, DIF, F-91297 Arpajon, France
  • 7Cyclotron Institute, Texas A& M University, College Station, Texas 77843, USA
  • 8Research Center for Nuclear Physics, Osaka University, Suita, Osaka 567-0047, Japan
  • 9Extreme Light Infrastructure - Nuclear Physics, Strada Atomistilor 407, Bucharest-Magurele, P.O. Box MG6, Romania

  • *therese.renstrom@fys.uio.no

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Vol. 98, Iss. 5 — November 2018

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