Abstract: MEASUREMENT OF~(114)Pd CUMULATIVE FISSON YIELD AND INVESTIGATION OF THk FINE STRUCTURE AT LIGHT PEAK IK IN MASS DISTRIBUTION OF ~(252)CF SPONTANEOUS FISSIONYU RUNLAN ;LI XUELIANG;CUI ANZHI;GUO JINGRU YAN SHUHENG;TANG PEIJIA;LIU DAMING（China Institute of atomic Energy，P.O，Box 275（26 ），Bdijing 102413）ABSTRACT The radiochemical methd is for the first time used to measure the cumulative fission yield of~(114)Pd in ~(252)Cf spontaneous fission，A value of（2．50±0．11）％is obtained．In order to solve the discrepancy on the existence of fine structure in the mass distribution of~(252)Cf spontaneous fission，the cumulative yields of~(112)pd and~(113)Ag~g are also measured．All these results and other availabledata are re-corrected and evaluated using the latest nuclear data. It is shown that there exists afine structure peak on the mass distribution curve at A = 113.Key words~(114)pd Cumulative fission yield ~(252)Cf spontaneous fission Mass distri-bution Fine structure