~(252)Cf自发裂变中子诱发~(235)U裂变~(99)Mo累计产额测量
DETERMINATION OF ~(99)Mo CUMULATIVE YIELD OF ~(235)U FISSION BY THE SPONTANEOUS FISSION NEUTRONS OF ~(252)Cf SOURCE
-
摘要: <正> 一、引言 裂变谱中子诱发~(235)U裂变~(99)Mo累计产额一直存在较大分歧。首先,苏联在五十年代测量的两个结果就相差8%。以后的测量结果虽然差距减小,但仍分为两组,彼此相差5%;一组接近苏联的高值6.4,另一组接近并稍低於热中子诱发~(235)U裂变的~(99)Mo累计产额6.14。在裂变产物产额的测量中,~(99)Mo往往被取作参考核,其产额数据的上述分歧,影响其他裂变产物产额的取值。因此,我们对其进行了测量。Abstract: Gross fission product gamma-ray spectra are obtained using a large volume Ge(Li) detector,and then,the total energy peaks corresponding to 99Mo 739 keV and 95Zr 756 keV gamma-rays are analysed. The R value, which is the ratio of 99Mo relative cumulative yields for fast and thermal fission of 235U,are determined.Absolute cumulative yield of 99Mo is obtained based on the normalization of the R Value to the reference values of FPYs concerned.Up to now,the published data can be divided into two groups:the one,~6.40,and the other,~6.10.Our result,6.12(1±2.8%),agrees well with the latter.
-
Keywords:
- Fission product /
- Fission product yield /
- Ge(Li) /
- R value.
-
-
[1] Petrzhak, K,. A.et al., AEC--tr--4696(1960) . [2] Bonyshkin,E.A.et al.,AEC--tr--4682(1960) . [3] 裂变产额组,核化学与放射化学,2(1) ,1(1980) . [4] 裂变产额组,核化学与放射化学,4(1) ,44(1982) . [5] Nethaway,D.R., UCRL--51 458(1973) . [6] Cuningham e,J.C.,AERE--R8753(1977) . [7] Debertin,K.,IAEA--208(Vol.2) ,1978. [8] 杨滟等,科技,4,483(1981) . [9] 王德安等,原子能研究所SCORPIO-3000系统谱分析软体包. [10] Glendenin L.E.et al.,Phys.Rev.C24,2600(1981) . [11] Cuninghame,J.G.et al.,J.Inorg.Nucl.Chem.,36, 1453(1974) .
计量
- 文章访问数: 972
- HTML全文浏览量: 0
- PDF下载量: 1943