Neutron Total Cross Sections of181Ta and238U from 24.3 keV to 1 MeV and Average Resonance Parameters

Abstract The capture cross sections of the 169Tm(n, γ) reaction were measured at the back streaming white neutron beam line (Back-n) of the China Spallation Neutron Source (CSNS) using four C6D6 liquid scintillation detectors. To obtain accurate cross sections, the background subtraction, normalization, and correction were carefully taken into consideration in the data analysis. For the resonance at 3.9 eV, the R-matrix code SAMMY was used to determine the resonance parameters with internally normalization method. While the average capture cross sections of 169Tm in the energy range between 30 keV and 300 keV were extracted relative to the 197Au(n, γ) reaction. The measured cross sections of the 169Tm(n, γ) reaction were reported in logarithmically equidistant energy bins with 20 bins per energy decade with a total uncertainty of 5.4%-7.0% in this paper, and described in terms of average resonance parameters by means of a Hauser-Feshbach calculation with fluctuations. Both of the point-wise cross sections and the averge resonance parameters showed fair agreement with the evaluated values of ENDF/B-VIII.0 library in the energy region studied.

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Measurements of neutron total cross-sections and resonance parameters of erbium at the Pohang Neutron Facility

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms ◽

10.1016/j.nimb.2009.10.184 ◽

2010 ◽

Vol 268 (2) ◽

pp. 106-113 ◽

Cited By ~ 5

Author(s):

Taofeng Wang ◽

Manwoo Lee ◽

Kyung-Sook Kim ◽

Guinyun Kim ◽

Young Do Oh ◽

...

Keyword(s):

Cross Sections ◽

Total Cross Sections ◽

Resonance Parameters ◽

Neutron Facility

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Neutron total cross sections and resonance parameters ofCu2963andCu2965. I

Physical Review C ◽

10.1103/physrevc.15.600 ◽

1977 ◽

Vol 15 (2) ◽

pp. 600-614 ◽

Cited By ~ 37

Author(s):

M. S. Pandey ◽

J. B. Garg ◽

J. A. Harvey

Keyword(s):

Cross Sections ◽

Total Cross Sections ◽

Resonance Parameters

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Neutron total cross-sections and resonance parameters of Mo and Ta

Pramana ◽

10.1007/s12043-007-0032-6 ◽

2007 ◽

Vol 68 (2) ◽

pp. 279-287

Author(s):

A. K. M. Moinul Haque Meaze ◽

K. Devan ◽

Y. S. Lee ◽

Y. D. Oh ◽

G. N. Kim ◽

...

Keyword(s):

Cross Sections ◽

Total Cross Sections ◽

Resonance Parameters

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Neutron Activation Resonance Integral of 74Ge and 76Ge and Evaluation of the 74Ge keV Neutron Radiative Capture Cross Section and Resonance Integral

Canadian Journal of Physics ◽

10.1139/p72-264 ◽

1972 ◽

Vol 50 (17) ◽

pp. 1978-1986

Author(s):

M. D. Ricabarra ◽

R. Turjanski ◽

G. H. Ricabarra

Keyword(s):

Cross Section ◽

Cross Sections ◽

Capture Cross Section ◽

Radiative Capture ◽

Resonance Integral ◽

Neutron Resonance ◽

Capture Cross ◽

Resonance Parameters ◽

Radiative Capture Cross Section ◽

Average Resonance

Values of the reduced activation resonance integral relative to the thermal cross section I′/σ0 of 74Ge and 76Ge were determined relative to gold by measuring cadmium ratios in a reactor spectrum.A lithium-drifted germanium γ-ray spectrometer was used to resolve the activities of the samples.The results for 74Ge are I′/σ0 = 1.514 ± 0.031 and I′ = 0.681 ± 0.123 b with an assumed σ0 = 0.45 ± 0.08 b; for 76GeI′/σ0 = 12.00 ± 0.16 and I′ = 1.992 ± 0.359 with an assumed σ0 = 0.166 ± 0.030 b.The values obtained for I′ are in serious disagreement with the values calculated with neutron resonance parameters and confirm previous results obtained in similar keV average resonance spacing isotopes.Due to this fact a careful evaluation of the keV neutron radiative capture cross section and resonance integral for 74Ge was undertaken.The evaluation and comparison with the experimental value of the resonance integral shows first that for nuclides with an average resonance spacing of keV the unresolved resonance integral has been seriously underestimated in many evaluations, and second that between 10 and 100 keV, resonance integrals calculated with smooth low resolution activation cross sections give a better calculation of neutron captures than that obtained with neutron resonance parameters.

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Neutron cross sections and average resonance parameters of238U for 55- and 144-keV neutrons

Soviet Atomic Energy ◽

10.1007/bf01123495 ◽

1987 ◽

Vol 62 (3) ◽

pp. 241-242 ◽

Cited By ~ 2

Author(s):

L. L. Litvinskii ◽

V. P. Vertebnyi ◽

V. A. Libman ◽

A. V. Murzin

Keyword(s):

Cross Sections ◽

Resonance Parameters ◽

Neutron Cross Sections ◽

Average Resonance

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Wechselwirkung von Neutronen mit Wolfram und seinen Isotopen

Zeitschrift für Naturforschung A ◽

10.1515/zna-1987-0901 ◽

1987 ◽

Vol 42 (9) ◽

pp. 909-916 ◽

Cited By ~ 5

Author(s):

K. Knopf ◽

W. Waschkowski

Keyword(s):

Neutron Scattering ◽

Cross Sections ◽

Coherent Scattering ◽

Total Cross Sections ◽

Resonance Parameters ◽

Scattering Lengths

The coherent neutron scattering lengths and total cross sections of elemental and oxide samples of natural and isotopically enriched W are determined. From these results the following coherent scattering lengths, b, and absorptions at 0.0253 eV, σγ were deduced:b (natW) = 4.86±0.02 fm, σγ = 17.3 ±0.5 b ,b (182W) = 7.04±0.04 fm, σγ = 19.6±0.3 b ,b (183W) = 6.59±0.04 fm, σγ = 10.5±0.2 b ,b (184W) = 7.55±0.06 fm, σγ = 1.7±0.1 b ,b (186W) = -0 .7 3±0.04 fm, σγ = 38.5 ±0.8 b .By comparison with the resonance parameters, the incoherence and the potential radii are derived and discussed. The bound level on W-182 must be fitted with a scattering width of gI0n = 161 meV at E0 = - 94 eV.

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