Relation of Transuranium Isotope Yields as Indicator of the Achieved Neutron Fluences at the Pulse Nucleosynthesis

The creation of transuranium nuclides under extremal pulsed neutron fluences (of 1024 n/cm2 units) of artificial nucleosynthesis is investigated by means of the dynamical model taking into account the temperature decrease at the matter expansion. An intensive (n, γ) activation of 238U target ensures the production of neutron-rich isotopes up to 257Fm. The results for isotope generation are obtained for five large scale explosive tests. The calculated yields are in good or satisfactory agreement with experiments. The relations for isotope yields depending on the neutron fluence are discussed for pairs of nuclides with atomic masses (245, 244), (246, 245), and (247, 246). The results obtained for two types of irradiated targets (238U mono-isotope and proposed variant with admixture of 239Pu) indicate on the approximately linear trend relative to the neutron fluences. The strongest confirmation of the linear trend is obtained for 238U target.