Preparation and characterization of three 7Be targets for the measurement of the 7Be(n,p)7Li and 7Be(n,a)7Li reaction cross sections

This manuscript describes the production of three targets obtained by implantation of different activities of 7Be into thin aluminium disks. Two of the produced targets were used to measure the 7Be(n, p)7Li cross section in the energy range of interest for the Big-Bang Nucleosynthesis. A third target was used to measure the cross sections of 7Be(n, p)7Li and 7Be(n, )7Li nuclear reactions with cold and thermal neutrons, respectively. This paper describes also the characterization of the first two targets, performed after the neutron irradiation, in terms of implanted 7Be activities and spatial distributions.The work has partly been funded by CHANDA (grant agreement No FP7-Fission-2013-605203). The Federal Ministry of Education and Research through the FMeVgrant 05K16PGA, has partially supported the use of the implantation equipment