Abstract
A total of 5 states in 117Sn and 4 states in 119Sn were observed to be Coulomb excited with α-particle and 16O projectiles. Level energies, spins, B(E2) and B(M1) transition probabilities and mean-lives were obtained. For 117Sn, spin 3 2 + states were observed at 158.7 and 1005 keV and spin 5 2 + states were observed at 1020, 1180 and 1447 keV. For 119Sn, spin 3 2 + states were observed at 23.9 and 920.5 keV and spin 5 2 + states were observed at 921.4, 1090 and 1354 keV. A total of 20 B(E2) values were obtained and they varied in magnitude from 1 10 to 10 times the single-particle estimate. About 12 B(M1) values were obtained and they range from 10 −1 to 10 −4 of the single-particle estimate. Evidence was found for the existence of quadrupole collective states built on low-lying excited quasiparticle states.
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