Thu·May 27, 2021Thursday·May 27, 2021

1. 01*

   Cross-sections for the ${}^{27}\mathrm{al}(\gamma ,\text{x}{)}^{22}\mathrm{na}$ multichannel reaction with the 28.3 mev difference of the reaction thresholds

   O.S. Deiev · I.S. Timchenko · S.N. Olejnik · A.N. Vodin · M.I. Ayzatskiy · V.A. Kushnir · V.V. Mitrochenko · S.A. Perezhogin

   The bremsstrahlung flux-averaged cross-sections $⟨\sigma (E_{\gamma \max })⟩$ and the cross-sections per equivalent photon $⟨\sigma (E_{\gamma \max }{)}_{\mathrm{Q}}⟩$ were first measured for the photonuclear multichannel reaction ${}^{27}\mathrm{Al}(\gamma ,\text{x}{)}^{22}\mathrm{Na}$ 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 $\gamma$-activation technique. The bremsstrahlung quantum flux was calculated with the program GEANT4.9.2 and, in addition, was monitored by means of the ${}^{100}\mathrm{Mo}(\gamma ,\mathrm{n}{)}^{99}\mathrm{Mo}$ reaction. The flux-averaged cross-sections were calculated using the partial cross-section $\sigma (E)$ values computed with the TALYS1.95 code for different level density models. Consideration is given to special features of calculating the cross-sections $⟨\sigma (E_{\gamma \max })⟩$ and $⟨\sigma (E_{\gamma \max }{)}_{\mathrm{Q}}⟩$ for the case of the final nucleus ${}^{22}\mathrm{Na}$ production in the ${}^{27}\mathrm{Al}$ photodisintegration reaction via several partial channels $\text{x}$: $\mathrm{n}\alpha +\mathrm{dt}+\mathrm{npt}+2n{}^3\mathrm{He}+n2d+2npd+2p3n$.

   nucl-exCPC(2022)·12 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.