Breakup of the proton halo nucleus B 8 at a sub-Coulomb energy

Résumé fourni par la source

We report inclusive breakup measurements of the proton halo nucleus $^{8}\mathrm{B}$ on a medium mass target, $^{90}\mathrm{Zr}$. The experiment was carried out at the TriSol facility of the University of Notre Dame at a beam energy of 26.5 MeV, corresponding to 90% of the Coulomb barrier. The data include angular distributions of the $^{7}\mathrm{Be}$ breakup fragment and of the elastically scattered $^{8}\mathrm{B}$ nuclei, allowing a good normalization of the $^{7}\mathrm{Be}$ yields. The latter are found to be in good agreement with the prediction of continuum-discretized coupled-channel calculations, thus pointing to the direct excitation to the continuum as the main production mechanism. The integrated breakup cross section, ${\ensuremath{\sigma}}_{\mathrm{bu}}=170\ifmmode\pm\else\textpm\fi{}40$ mb, exhausts most of the total reaction cross section, indicating the dominance of direct processes below the barrier. A comparison of all existing breakup cross sections, on various targets at sub- and near-barrier energies, is also included.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.