MASS DISTRIBUTION IN FISSION SPECTRUM NEUTRON INDUCED FISSION OF U-235

Qi Linkun, Liu Conggui, Tang Peijia, Li Ze, Wang Xiuzhi, Zhang Sujing, Liu Yonghui, Liu Daming, Ju Changxin, Lu Huijun, Zhu Jiaxuan, Guo Jingru

Institute of Atomic Energy, Beijing, China

The mass yield distribution for the fission spectrum neutron induced fission of U-235 was measured for 40 nuclides. 10 nuclides' yields are reported for the first time. The irradiation was performed at the HWRR of IAE. The fission rate was counted by fission chamber. The fission product activity was measured by using radiochemical method as well as direct Ge(Li) γ-spectrometry. The mass yield curve is given and its features are described. And besides, fission yields of Mo-99 are discussed.

KEYWORDS: Mass distribution, fission spectrum neutron, radiochemical method, Ge(Li) γ-spectrometry, Mo-99 yield