Neutron Total Cross-Section Measurements and Resonance Parameter Analysis of Holmium, Thulium, and Erbium from 0.001 to 20 eV

Measurement of thermal neutron cross section and resonance integral for the 165Ho(n, γ)166gHo reaction

“…This set of measurement was made relative to 55 Mn nuclide by using 241 Am-Be neutron source. The present experiment was conducted in the reactor neutron spectral field environment and the results obtained in this experiment for σ 0 (59.0 ± 2.1 b) are found to be in excellent agreement with the result of Yücel and Karadag [17], in less than 1% but could not agree with the next recent results of Danon et al published in 1998 [18] in which case the difference was greater than 9%. The other literature value where the difference of the present σ 0 is more than 10% is of Steinnes [43].…”

“…Present work 2007 58.98 ± 2.10 657 ± 36 Yücel and Karadag [17] 2005 59.2 ± 2.5 667 ± 46 Danon et al [18] 1998 64.4 ± 2.8 De Corte [31] 1989 58.1 ± 2.3 636 ± 32 Heft [41] 1978 61.4 ± 1.0 718 ± 40 Ryves and Zieba [26] 1974 61.2 ± 1.1 618 ± 33 Van Der Linden et al [42] 1974 626 ± 93 Steinnes [43] 1972 65 ± 2 710 ± 30 Zimmerman et al [44] 1967 60 ± 2 Sage and Sher [45] 1966 excellent agreement of these values has provided great confidence to our results. The important aspect revealed in this inter-comparison study was that when we set the alpha parameter to zero (i.e., to 1/E ideality condition), the I 0 value changed greatly (i.e., to 699 b with respect to cobalt and 637 b with respect to gold).…”

“…The reported thermal cross section of the nuclide is in the range of 58 to 66 b and the resonance integral value varies between 618 and 752 b. The two recently published values [17,18] of the thermal neutron capture cross section of this nuclide, measured by using the 241 Am-Be neutron source and a linear accelerator, respectively, also differ by about 9%. The present work has been carried out (in the reactor neutron environment) to provide the consistent set of thermal neutron cross sections and resonance integrals data to resolve the discrepancies and provide production support for the nuclide in medical use.…”

Production, isolation and characterization of radiochemically pure 163Ho samples for the ECHo-project

“…Er is missing, because it has been extensively burned up during the long irradiation duration due to its high thermal neutron capture cross section of ca. 650 barn [23]. The relative content at 164 u with respect to the other masses due to Er isotopes is higher in the Ho fraction than in the separate analysis of the Er fraction.…”

“…The γ-ray spectra of irradiated aliquots of the Ho samples showed the activation products 24 Na, 165 Dy, 166 Ho, 167 Ho, and 171 Er (besides 166m Ho, which was present already in the original samples). From these, the contents of stable (or long lived) impurities of 23 Na, 164 Dy, 165 Ho, 166m Ho, and 170 Er as given in Table 6 were evaluated.…”