High efficiency ISOL system to produce neutron deficient short-lived alkali RIBs on GANIL/SPIRAL 1 facility

• Published in: Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2020-01, Vol.463, p.163-168
• Main Authors: Kuchi, V., Jardin, P., Michel, C., Maunoury, L., Dubois, M., Delahaye, P., Bajeat, O., Hormigos, S., Métayer, V., MacCormick, M., Roussière, B., Guillot, J.
• Format: Article
• Language: English
• Subjects: Fusion-evaporation reaction; ISOL technique; Neutron-deficient isotopes; Physics; SPIRAL1 upgrade; Surface ionization; Target ion source system
• ISSN: 0168-583X; 1872-9584; 1872-9584; 0168-583X
• DOI: 10.1016/j.nimb.2019.05.070

The SPIRAL1 (Système de Production d’Ions Radioactifs Accélérés en Ligne) facility at GANIL (Grand Accélérateur National d’Ions Lourds) is developing new techniques to access nuclei in the neutron-deficient isotope region far from the stability-valley, with Z ranging from 30 to 60. The availability of different primary beams, ranging from carbon to uranium with energies up to 95 MeV/A, gives an opportunity to produce a large variety of radioactive ion beams. The production of neutron-deficient short-lived alkalis by fusion-evaporation reactions is the focus of this work. A simple and compact target ion source system (TISS) is designed to produce isotopes of 74Rb (τ1/2 = 64.8 ms) and 114Cs (τ1/2 = 570 ms). The efficiencies of the different processes involved in the production are evaluated. Radioactive recoils are produced through the interaction of heavy-ion beams, respectively 20Ne beam and 58Ni beam at an intensity of 1013 and 1012 pps, with a thin 58Ni target. High atom-to-ion transformation (ATI) efficiency should be obtained above 70% and 90% for 74Rb and 114Cs nuclei respectively. The expected intensities of the RIBs are estimated to be around 104 pps at the exit of the TISS.