Abstract

Abstract Excitation functions have been measured for the formation of 225 Th, 226 Th, 223 Ac and 224 Ac, when 232 Th was bombarded by 84 Kr ions at energies ranging between 450 and 494 MeV. The thresholds of all the reactions appear at 450 MeV (330 MeV c.m.), a higher energy than expected. Cross sections of the order of 1 mb are reached for these transfer reactions corresponding to a large number of neutrons. The results are compared with the same reactions induced with lighter projectiles.

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