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用~(175)Yb(i)与~(169)Yb(j)的生成率(B_i~0与B_j~0)和~(174)Yb与~(163)Yb的热中子俘获截面文献值(σ_i与σ_j)分别计算得出的照射处的表观中子通量(I_i与I_j)之间的比值R_(ij)不是预期的1而是文献值2.46。重复以上实验,由两个样品所得的R_(ij)值分别为2.52和2.45。B_i~0与B_j~0的误差均小于10％。由于~(163)Yb的共振积分与热中子俘获截面之比值8.3比~(174)Yb的(<0.10)为大,R_(ij)的
The thermal neutron capture cross-sectional values of ~ (175) Yb (i) and ~ (169) Yb (j) and the thermal neutron capture values of ~ (174) Yb and ~ (163) Yb were calculated for B_i ~ 0 and B_j ~ The ratio R_ (ij) between the apparent neutron flux (I_i and I_j) at the illumination calculated by σ_i and σ_j, respectively, is not the expected value but is 2.46. Repeat the above experiment, the R_ (ij) values obtained from the two samples were 2.52 and 2.45, respectively. B_i ~ 0 and B_j ~ 0 errors are less than 10%. Since the ratio of resonance integral to thermal neutron capture cross section of ~ (163) Yb is larger than (<0.10) of ~ (174) Yb, the ratio of R_ (ij)