Abstract
The γ-ray strength function (γSF) in 80 Se is an important parameter to estimate the neutron-capture cross section of 79 Se which is one of the long-lived fission products (LLFPs). Until now, the γSF method was applied for 80 Se only above the neutron-separation energy (S n ) and the evaluated 79 Se(n,γ) cross section has an instability caused by the GSF below S n . We studied the dipole-strength distribution of 80 Se in a photon-scattering experiment using bremsstrahlung produced by an electron beam of an energy of 11.5 MeV at the linear accelerator ELBE at HZDR. The present photoabsorption cross section of 80 Se was combined with results of (γ,n) experiments and are compared with predictions usinmg the TALYS code. We also estimated the 79 Se(n,γ) cross sections and compare them with TALYS predictionms and earlier work by other groups.
Highlights
The γ -ray strength function (γ SF) is an important parameter for the estimate of cross sections of photonuclear reactions and their inverse reactions for nuclear applications, such as nuclear medicine and nuclear engineering
To evaluate the neutron-capture cross section, an experimental photoabsorption cross section (EPACS) was constructed on the basis of the following components. i) 0 ≤ Eγ ≤ 6.2 MeV: The TLO model is taken, because there is no experimental data in this energy region. ii) 6.2 MeV ≤ Eγ ≤ 10.0 MeV: The photoabsorption cross section deduced from the present (γ, γ ) experiment is used
The uncertainties of cross sections from possible model selections of the nuclear level density in TALYS are shown as a blue band
Summary
The γ -ray strength function (γ SF) is an important parameter for the estimate of cross sections of photonuclear reactions and their inverse reactions for nuclear applications, such as nuclear medicine and nuclear engineering. To predict the 79Se(n,γ ) cross section, the dipole strength of 80Se was measured using the (γ , γ ) reaction at the bremsstrahlung facility γ ELBE at the HelmholtzZentrum Dresden-Rossendorf. The photoabsorption cross section of 80Se was studied at the bremsstrahlung facility γ ELBE.
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