In situ neutron activation analysis of and the neutron capture cross-section for90Sr+

Measurement of the Thermal Neutron Cross Section of the90Sr(n, γ)91Sr Reaction

“…Since the targets included %r, a r-ray emitter and a tracer for gOSr, and a ratio of the amount of %r to that of 90Sr was measured in advance, an effective cross section of the goSr(n,r)glSr reaction for a reactor neutron spectrum was determined from the ratio of radioactivities of 91Sr and 86Sr, and neutron flux data. The resonance integral was also measured by a modified Cd-ratio measurement.Considering an upper limit of the resonance integral to be 0.16 b, the thermal neutron cross section (2,200 m/s neutron cross section) of goSr(n, ~)~l S r reaction was found to be 0.0153+:: :::: b.The value obtained is only 1/50 of the value reported by Zeisel (1966), and is in good agreement with the figure reported by McVey et al (1983). …”

Measurement of the Thermal Neutron Capture Cross Section and the Resonance Integral of the90Sr(n, γ)91Sr Reaction

“…(7), and then the resonance integral was obtained from s 0 , and Eqs. (4) and (10). The obtained results were summarized in Table 5 together with the evaluated data.…”

“…The data reported previously 3,[9][10][11] are tabulated in Table 1. There are discrepancies among values of thermal cross sections: Zeisel 9) reported the cross section as 800 mb, McVey et al 10) 14.0 mb, Harada et al 3) 15.3 mb, and Lone et al 9.7 mb. 11) Only one data is reported for the upper limit of the I 0 3) and no exact data for I 0 .…”

“…Figure 1 shows the partial decay scheme of 91 Sr. They used a 10) 14.0±2.4 -Lone et al 11) 9.7±0.7 -Harada et al 3) 15.3 polyethylene bottle as an irradiation target container, and the period of irradiation was limited to less than 10 min. Therefore, sufficient yields of 91 Sr were not obtained, and only the upper limit of I 0 was obtained.…”