Speaker
Description
This paper reports the results of the first measurements of the differential cross section of the 80Se(γ,n)79Se 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 79Se 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.
Funding Agency
US Department of Energy Grants:
DE-FG02-97ER41033
DE-NA0002793
DE-FG02-88ER40387
DE-NA0001837
DE-NA0002905
US Department of Homeland Security Grant:
2012-DN-077-ARI-062
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