14.9MeV中子诱发~(235)U裂变时几个核素累积产额的绝对测量

    THE ABSOLUTE DETERMINATION OF CUMULATIVE YIELDS OF SEVERAL NUCLIDES FROM 14.9MeV NEUTRON-INDUCED FISSION OF

    • 摘要: <正> 引言 在裂变产额数据中,人们对单能中子诱发裂变的数据越来越感兴趣,其中14MeV中子诱发裂变产额测量工作较多,但在所发表的数据中,除~(99)Mo和~(140)Ba是绝对测量值外,其余大部分是相对测量值,并且数据分歧较大。

       

      Abstract: The cumulative yields of 95Zr, 97Zr, 99Mo, 103Ru, 106Ru, 143Ce, 144Ce, 140Ba and 147Nd in the fission of 235U induced by neutrons of 14.9 MeV are determined absolutely by radio-chemical method. The 14.9 MeV neutrons are produced in the T(d, n) 4He reaction using the 600 kV Cockroft-Walton type accelerator. A rotating tritium target is used and the neutron flux is 2×1010n/s. An enriched uranium 235U(90%) is used as material of sample and standard targets. The absolute fission rate of the sample target is measured by double fission ionization chamber. Details of chemical procedure are given in a previous publication2.The cumulative yields determined by the above mentioned method are listed in following table:The errors given in the table are total errors including statistical and systematic errors.

       

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