Measurement of Effective Neutron Capture Cross Section of ^166mHo using Two Step Irradiation Technique

Measurement of Thermal Neutron Capture Cross Section and Resonance Integral of the166mHo(n, γ167Ho Reaction using a Two-Step Irradiation Technique

“…The results obtained were consistent with the results for the effective cross section reported by Harada et al 9) and Krane,10) but were about 1/3 of the result obtained by Masyanov et al 8) for σ 0 and one order larger for I 0 than the result by Masyanov et al 8) It was found that the two-step irradiation technique is effective for the measurement of the cross section of 166m Ho, which is not available commercially, and that this technique was also effective to estimate and correct for the amount of 167 Ho produced via the double capture process from 165 Arrows A show the uncertainty of I γ , arrows B the limits of uncertainty of σ 0 due to the uncertainty of I γ , and arrows C those of I 0 due to the uncertainty of I γ .…”

“…In this regard, the present authors have measured the σ 0 and the I 0 of the important FP nuclides, such as 137 Cs, 1, 2) 90 Sr, 3) 99 Tc, 4) 129 I 5) and 135 Cs. 6) Holmium-166m is also a long-lived fission product, whose half-life is 1,200 yr. 7) There is no experimental data of the σ 0 and the I 0 for 166m Ho, except the resonance parameters measured by Masyanov et al, 8) the effective capture cross section (σ ) measured by Harada et al,9) and theσ measured by Krane. 10) Masyanov et al 8) identified three resonances of 166m Ho in the energy range from 0.001 eV to 137 eV, and calculated from the resonance parameters the σ 0 of 166m Ho to be 9.14±0.65 kb and the I 0 1.14±0.09 kb.…”

“…They assumed the statistical weight of the channel spin 11) to be equal to 1. Harada et al 9) measured theσ of 166m Ho by an activation method, which is free from the ambiguity of the channel spin, using a two-step irradiation technique, and determined theσ to be 3±1 kb. Krane 10) reported briefly theσ of 166m Ho to be 4.1±0.7 kb.…”

“…Since the sample of 166m Ho was not commercially available, a two-step irradiation technique 9) was introduced. This technique was also effective II.…”

Measurement of Effective Capture Cross Section of Americium-243 for Thermal Neutrons

“…Neutron radiative capture cross sections for 2,200 m/s neutrons ( 0 ) and radiative capture resonance integrals (I 0 ) for various MAs and LLFPs have been measured in this point of view. [1][2][3][4][5][6][7][8][9][10][11] However, the cross section data is not sufficient for these analyses and studies in the current status, and there exist problems in terms of accuracies of the cross section data for some nuclides such as 237 Np, 238 Pu, 241 Am, and 243 Am. 12) Americium-243 is one of the important MAs in the study of nuclear transmutation because of not only its long half-life (7,370 yr) but also the production of higher-mass Cm isotopes, e.g.…”