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  • 1 China Institute of Atomic Energy P.O. Box 275(85) Beijing (People's Republic of China)
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The cumulative yields of127gSn and128Sn in the region near symmetry for the spontaneous fission of252Cf have been measured by a radiochemical method for the first time. The yield values are (0.0437 ±0.0021)·10–2 and (0.182±0.009)·10–2, respectively. The cumulative yield of128Sn measured in this work is compared with those predicted based on WAHL's empirical Zp and Ap' models. The measured value is higher than both predictions, values 0.164·10–2 from the Zp model, and 0.144·10–2 on the basis of Ap' models.