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以Godiva临界模型为基础,建立了两种次临界模型,并计算了两种模型中不同易裂变核材料含量的k本征值和α本征值。结果表明,并非k越小,α就会越小。对于含氢介质较多的系统,即使k很小,由于瞬发中子寿命很大,α也会接近于0,因而α不能直观地表征系统的临界特性,而k比α更适合这样的系统。对瞬发中子寿命较小的次临界系统,α绝对值较大,能直观地显示系统中子随时而间的衰减行为,对这种系统,使用α是合适的。
Based on the Godiva critical model, two subcritical models were established, and the k eigenvalues and the α eigenvalues of different fissile nuclear materials in the two models were calculated. The result shows that the smaller α is, the smaller α is. For systems containing more hydrogen, α is close to zero even if k is very small, so α can not directly characterize the criticality of the system, and k is more suitable for such a system . For sub-critical systems with shortened lifetimes of neutrons, α has a large absolute value and can directly show the decay behavior of neutron neutrons from time to time. For this system, α is appropriate.