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由~(174)Yb和~(168)Yb的(n,γ)反应产生的~(175)Yb(i)和~(169)Yb(j)的生成率之比值B_i~o/B_j~o;称为~(175)Yb与~(169)Yb的中子活化R矩阵元R_(ij)。R_(ij)的准确度比之其他的R矩阵元的要高得多。另外,~(168)Yb(n,γ)~(169)Yb反应的共振积分与热中子俘获截面之比值的文献值为8.33±0.74,而~(174)Yb(n,γ)~(175)Yb反应的为<0.1,二者之间的差别比较显著,~(175)Yb与~(169)Yb的半衰期又比较适
The ratios B_i ~ o / B_j ~ o of the yields of ~ (175) Yb (i) and ~ (169) Yb (j) produced by the reaction of ~ (174) Yb and ~ (168) ; Neutron-activated R matrix elements R_ (ij) called ~ (175) Yb and ~ (169) Yb. The accuracy of R_ (ij) is much higher than that of other R matrix elements. In addition, the literature value of the ratio of resonance integral to thermal neutron capture cross section of ~ (168) Yb (n, γ) ~ (169) Yb was 8.33 ± 0.74 and ~ 174 Yb (n, γ) 175) Yb <0.1, the difference between the two is significant, and the half-lives of ~ (175) Yb and ~ (169) Yb are more appropriate