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

[摘要] The SPIRAL1 (Systeme de Production d'Ions Radioactifs Acceleres en Ligne) facility at GANIL (Grand Accelerateur 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 Rb-74 (tau(1/2) = 64.8 ms) and Cs-114 (tau(1/2) = 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 Ne-20 beam and Ni-58 beam at an intensity of 10(13) and 10(12) pps, with a thin Ni-58 target. High atom-to-ion transformation (ATI) efficiency should be obtained above 70% and 90% for Rb-74 and Cs-114 nuclei respectively. The expected intensities of the RIBs are estimated to be around 10(4) pps at the exit of the TISS.

[发布日期] 2020-01-15

[效力级别]  Proceedings Paper

[关键词] Neutron-deficient isotopes;Fusion-evaporation reaction;ISOL technique;Surface ionization;Target ion source system;SPIRAL1 upgrade