LEVEL AND ISOMER SYSTEMATICS IN EVEN TIN ISOTOPES FROM 108SN TO 118SN OBSERVED IN CD(ALPHA,XN) REACTIONS

The gamma-ray spectra observed when separated cadmium isotopes (A = 106-116) are bombarded by 28-50 MeV α-particles from the Berkeley 2.2 m cyclotron have been studied with Ge(Li) detectors. Levels in even tin isotopes produced by (α, xn) reactions are reported. The prompt and delayed spectra have been studied using nsec time analysis and the natural beam bunching of the cyclotron to give a zero of time. Isomers have been observed in 118Sn with t 1 2 = 20 nsec, 230 nsec and > 500 nsec, in 116Sn with t 1 2 = 350 nsec and > 500 nsec and in 114Sn with t 1 2 > 500 nsec and in 112Sn with t 1 2 = 14 nsec. The level and isomer systematics in the even tin isotopes are discussed. Levels in odd tin isotopes for A = 113 to A = 119 are also discussed. © 1969.