Constraints on the dipole photon strength functions from experimental multistep cascade spectra

M. Krtička, S. Goriely, S. Hilaire, S. Péru, and S. Valenta
Phys. Rev. C 99, 044308 – Published 15 April 2019
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Abstract

Viable theoretical predictions of photon strength functions (PSFs) covering the whole nuclear chart are of great interest for different nuclear applications, including, in particular, nuclear astrophysics. Recently, such a global PSF model consisting of axially deformed Hartree-Fock-Bogolyubov (HFB) + quasiparticle random phase approximation (QRPA) calculations with the D1M Gogny interaction and a phenomenological low-energy contribution was proposed. In the present paper, we test this model predictions against previously published data from measurements of multistep γ cascades following neutron capture on isolated resonances performed with the DANCE detector. Such data present a stringent test of the PSFs models, in particular for the properties of the M1 scissors mode and the possible low-energy PSFs enhancement. A detailed comparison is made for spectra obtained from resonances for spherical, quasispherical, and well-deformed nuclei. This comparison indicates that the location and strength of the scissors mode is reasonably described by the HFB + QRPA approach. Moreover, a low-energy PSF contribution, not predicted by the HFB + QRPA calculation of the photoabsorption PSF, should be present in all nuclei. A systematics of this low-energy contribution, assumed in the M1 PSF, is proposed.

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  • Received 11 December 2018
  • Revised 11 January 2019

DOI:https://doi.org/10.1103/PhysRevC.99.044308

©2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

M. Krtička1, S. Goriely2, S. Hilaire3, S. Péru3, and S. Valenta1

  • 1Faculty of Mathematics and Physics, Charles University, 180 00 Prague, Czech Republic
  • 2Institut d'Astronomie et d'Astrophysique, Université Libre de Bruxelles, CP-226, 1050 Brussels, Belgium
  • 3CEA, DAM, DIF, F-91297 Arpajon, France

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Vol. 99, Iss. 4 — April 2019

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