Production cross-sections of neutron-rich Pb and Bi isotopes in the fragmentation of 238U
Neutron-rich lead and bismuth isotopes have been produced by cold-fragmentation reactions induced by U-238 projectiles at 1 AGeV impinging on a beryllium target. The high-resolving power FRagment Separator (FRS) at GSI allowed us to identify and determine the production cross-sections of 43 nuclei, nine of them for the first time (Pb-216,Pb-217,Pb-218,Pb-219 and Bi-219,Bi-220,Bi-221,Bi-222,Bi-223). These data are compared to other previously measured cross-sections in similar reactions and model calculations.
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