Searching for treasures at sub-barrier energies: the case of ⁸B and ⁷Be

¹ Department of Physics, The University of Ioannina, Ioannina GR45110, Greece
² HINP, The University of Ioannina, Ioannina GR45110, Greece
³ Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
⁴ Institutode Física, Universidad Nacional Autónoma de México, A.P.20-364, Mexico City 01000, Mexico.
⁵ Centrode Estudios Avanzados en Física, Matemáticasy Computación (CEAFMC), Department of Integrated Sciences, University of Huelva, 21071 Huelva, Spain
⁶ Department of Chemistry, National and Kapodistrian University of Athens, Athens, Greece
⁷ INFN Laboratori Nazionalidel Sud, via S.Sofia 62, 95125, Catania, Italy

^* e-mail: apakou@uoi.gr

Published online: 10 September 2021

Abstract

Unexpected and challenging experimental results, at below barrier energies for weakly bound nuclei, are briefly reviewed in this article. The emphasis will be on our recent breakup results for ⁸B+²⁰⁸Pb at deep sub-barrier energies, indicating a dominance of direct mechanisms at this low energy regime. We will also present, a preliminary analysis of the ⁴He and ³He - particle production events for the ⁷Be + ²⁰⁸Pb reaction. These data were collected at the same experiment and at similar deep sub-barrier energies, exhibiting large yields compatible with cluster transfer processes. To confirm these results a new experiment to be performed at TriSol is planned, as soon as the upgrading of this facility will be completed.