Cross-sections for the ${^{27}\!\rm{al}}(γ,\textit{x})^{22}\rm{na}$ multichannel reaction with the 28.3 mev difference of the reaction thresholds

Abstract

The bremsstrahlung flux-averaged cross-sections σ(E γmax ) and the cross-sections per equivalent photon σ(E γmax ) Q were first measured for the photonuclear multichannel reaction 27 Al(γ, x) 22 Na at end-point bremsstrahlung gamma energies ranging from 35 MeV to 95 MeV. The experiments were performed with the beam from the NSC KIPT electron linear accelerator LUE-40 with the use of the γ-activation technique. The bremsstrahlung quantum flux was calculated with the program GEANT4.9.2 and, in addition, was monitored by means of the 100 Mo(γ, n) 99 Mo reaction. The flux-averaged cross-sections were calculated using the partial cross-section σ(E) values computed with the TALYS1.95 code for different level density models. Consideration is given to special features of calculating the cross-sections σ(E γmax ) and σ(E γmax ) Q for the case of the final nucleus 22 Na production in the 27 Al photodisintegration reaction via several partial channels x: nα + dt + npt + 2n 3 He + n2d + 2npd + 2p3n.

Photonuclear reactions ${^{65}\rm{Cu}}(γ,n)^{64}\rm{Cu}$ and ${^{63}\rm{Cu}}(γ,xn)^{63-x}\rm{Cu}$ cross-sections in the energy range $E_{\rm{γmax}}$ = 35-94 MeV

“…Experimental study of copper photodisintegration cross-sections has been carried out through measurements of the residual γ-activity of the irradiated sample, which enabled one to obtain simultaneously the data from different channels of photonuclear reactions. This technique is well known and has been described in a variety of papers concerned with the investigation of multiparticle photonuclear reactions, e.g., on the nuclei 27 Al [22,23], 93 Nb [24][25][26], 181 Ta [1,27].…”