A-5. Actinide data: Thermal neutron cross sections, resonance integrals, and Westcott factors
Nuclide	Type	Cross Section   σx [barn]	Westcott Factor   g	Resonance Integral   RI [barn]	Source
90-Th-232	σ0γ	7.35 ± 0.03	0.9982	83.3 ± 1.5	[1]
92-U-233	σ0γ   σ0f	45.5 ± 0.7   529.1 ± 1.2	1.0495 ± 0.0223   0.9955 ± 0.0015	138 ± 6   775 ± 17	[2]
92-U-234	σ0γ	99.8 ± 1.3	0.9903	640 ± 20	[1]
92-U-235	σ0γ   σ0f	98.8 ± 0.8   582.6 ± 1.1	0.9956 ± 0.0016   0.9771 ± 0.0008	146 ± 6   275 ± 5	[3]
92-U-236	σ0γ	5.09 ± 0.10	1.0027	345 ± 15	[4]
92-U-237	σγ	443 ± 167	0.9767	1200 ± 200	[5]
92-U-238	σ0γ	2.683 ± 0.012	1.0009	277 ± 3	[6]
93-Np-237	σ0γ	175.9 ± 2.9	0.982	652 ± 24	[1]
93-Np-239	σrγ	68 ± 10	1.0005	455	[7]
94-Pu-238	σ0γ   σ0f	540 ± 7   17.9 ± 0.4	0.9563   0.9562	162 ± 15   33 ± 5	[1]
94-Pu-239	σ0γ   σ0f	269.3 ± 2.9   748.1 ± 2.0	1.1369 ± 0.0119   1.0553 ± 0.0013	180 ± 20   303 ± 10	[2]
94-Pu-240	σ0γ	289.5 ± 1.4	1.0264	8452 ± 200	[1]
94-Pu-241	σ0γ   σ0f	362.1 ± 5.1   1011.1 ± 6.2	1.038   1.046 ± 0.006	162 ± 8   570 ± 15	[8]
94-Pu-242	σ0γ	18.5 ± 0.5	1.0096	1115 ± 40	[1]
95-Am-241	σ0γ   σ0f   σ0γ(g)   σ0γ(m)	587 ± 12   3.20 ± 0.09   533 ± 13   54 ± 5	1.051   0.996	1425 ± 100   14.4 ± 1.0   1230 ± 100   195 ± 20	[1]
95-Am-242	σf   σγ	2100 ± 200   330 ± 50	1.0502   1.0471	986   186	[7]
95-Am-242m	σγ   σ0f	1290 ± 300   6200 ± 200	1.100   1.104	211   1570 ± 80	[9]
95-Am-243	σf   σ0γ	0.1983 ± 0.0043   75.1 ± 1.8	1.012   1.014	8.5 ± 0.5   1820 ± 70	[10]
96-Cm-242	σf   σγ	< 5   16 ± 5	0.9964   0.9939	12.9 ± 0.7   110 ± 20	[11]
96-Cm-243	σ0γ   σ0f	130 ± 10   617 ± 20	1.005   1.0054	215 ± 20   1570 ± 100	[1]
96-Cm-244	σ0γ   σ0f	15.2 ± 1.2   1.04 ± 0.20	0.999   0.989	655 ± 30   12.5 ± 2.5	[1]

 

Notation
σ0	Neutron cross section at 2200 m/s.
σ	Neutron cross section measured in a Maxwellian spectrum.
σr	Neutron cross section measured with reactor neutrons.
σc	Neutron cross section calculated from resonance parameters or derived from equivalent data of the natural element.
σ(m)	Neutron cross section leading to a metastable state of the product.
σ(g)	Neutron cross section leading to the ground state of the product.
g	Westcott factor: ratio of the Maxwellian averaged cross section σ to 2200 m/s cross section σ0 (g = σ/σ0 ). If the cross section varies as a function of 1/v, g = 1.0.
RI	Infinite dilution resonance integral (including the 1/v contribution).
γ	Subscript for radiative capture cross section.
f	Subscript for fission cross section.

 

References
ANR	S. F. Mughabghab, Atlas of Neutron Resonances, Resonance Parameters and Thermal Cross Sections, Z = 1 - 100, 5th Edition, Elsevier, Amsterdam, 2006.
ENDF/B-VII	U.S. Evaluated Nuclear Data Library ENDF/B-VII β1, http://www.nndc.bnl.gov/exfor7/endf00.htm, 2 October 2006; see also M. B. Chadwick et al., ENDF/B-VII.0 : Next Generation Evaluated Nuclear Data Library for Nuclear Science and Technology, Nucl. Data Sheets 107 (2006) 2931.
JEFF-3.1	Joint Evaluated Fission and Fusion File, Incident-neutron data, http://www-nds.iaea.org/exfor/endf00.htm, 2 October 2006; see also A. Koning, R. Forrest, M. Kellett, R. Mills, H. Henriksson, Y. Rugama, The JEFF-3.1 Nuclear Data Library, JEFF Report 21, OECD/NEA, Paris, France, 2006, ISBN 92-64-02314-3.
TRK-05	A. Trkov, G.L. Molnár, Zs. Révay, S.F. Mughabghab, R.B. Firestone, V.G. Pronyaev, A.L. Nichols, M.C. Moxon, Revisiting the 238U Thermal Capture Cross Section and Gamma-ray Emission Probabilities from 239Np Decay, Nucl. Sci. Eng. 150 (2005) 336.

 

Notes

[1] Data adopted from ANR; no uncertainty available for Westcott factors. [2] Data adopted from ANR; gγ factor was calculated from fission and absorption cross-section data. [3] All data adopted from ANR. [4] Cross-section data and resonance integral adopted from ANR; Westcott factors without uncertainties calculated from the ENDF/B-VII library. [5] Cross-section data and resonance integral adopted from ANR; Westcott factor without uncertainty calculated from the JEFF-3.1 library; RI = 296 barns in the ENDF/B-VII library. [6] Thermal cross-section data adopted from TRK-05 (value of 2.680 ± 0.019 barns reported in ANR), and gγand resonance integral take from ANR; no uncertainty available for Westcott factor. [7] Cross-section adopted from ANR; Westcott factors without uncertainties and resonance integrals calculated from the ENDF/B-VII library; a relative uncertainty of 20% is recommended. [8] Data adopted from ANR; no uncertainty available for the gγ factor. [9] Data adopted from ANR; gγ factor without uncertainty was calculated from the ENDF/B-VII library; resonance integral for radiative capture reported in ANR without uncertainty; a relative uncertainty of 20% is recommended. [10] Data adopted from ANR; gf factor without uncertainty was calculated from the ENDF/B-VII library. [11] σγ and resonance integrals adopted from ANR; σf < 5 barns is reported in ANR; values of 3 and 5 barns are given in the ENDF/B-VII and the JEFF-3.1 libraries, respectively; Westcott factors without uncertainties were calculated from the JEFF-3.1 library.

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