Measurement of the Se80(γ,n) reaction with linearly polarized γ rays

S. A. Yates, B. Fallin, C. R. Howell, Krishichayan, W. Tornow, and S. M. Grimes
Phys. Rev. C 98, 054621 – Published 30 November 2018

Abstract

This paper reports the results of the first measurements of the differential cross section of the Se80(γ,n)Se79 reaction with a linearly polarized gamma-ray (γ-ray) beam. The cross section was measured at three incident γ-ray beam energies: 15.6, 15.8, and 16.0 MeV, with a beam energy spread of 3.0% full width at half-maximum (FWHM). The differential cross section for the excitation spectrum in Se79 was measured at two scattering angles in the plane of the beam polarization: θ=90 and 135, and at one angle in the plane perpendicular to the plane of polarization: θ=90. The total photoneutron cross sections determined from these data are between 0.8 and 1.3 standard deviations smaller than previously published results. The excitation spectra measured in this work were fit with a Hauser-Feshbach model. Better fits to the data were obtained with a constant-temperature formulation of the nuclear level density (NLD) than with a Fermi-gas NLD model. The parameters for the constant-temperature NLD model obtained in this work are consistent with those obtained for medium-mass nuclei in previous studies.

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  • Received 26 April 2018
  • Revised 29 August 2018

DOI:https://doi.org/10.1103/PhysRevC.98.054621

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsAccelerators & Beams

Authors & Affiliations

S. A. Yates*, B. Fallin, C. R. Howell, Krishichayan§, and W. Tornow

  • Department of Physics and Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina 27708, USA

S. M. Grimes

  • Department of Physics, Ohio University, Athens, Ohio 45701, USA

  • *stephen.yates@duke.edu
  • fallin@tunl.duke.edu
  • howell@tunl.duke.edu
  • §krishi@tunl.duke.edu
  • tornow@tunl.duke.edu
  • grimes@ohio.edu

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Issue

Vol. 98, Iss. 5 — November 2018

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