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Section: 11 | Neutron Scattering and Absorption Properties |
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NEUTRON SCATTERING AND ABSORPTION PROPERTIES

Norman E. Holden

This table presents an evaluated set of values for experimental quantities that characterize the properties for scattering and absorption of neutrons. The neutron cross section is given for room temperature neutrons, 20.43 °C, corresponding to a thermal neutron energy of 0.0253 electron volts (eV) or a neutron velocity of 2200 meters/second. The neutron resonance integral is defined over the energy range from 0.5 eV to 0.1 × 106 eV, or 0.1 MeV. Bound neutron scattering lengths and neutron cross sections averaged over a Maxwellian spectrum at 30 keV for astrophysical applications are also presented. A list of the major references used is given below. The literature cutoff date is January 2003. Uncertainties are given in parentheses. Parentheses with two or more numbers indicate values to the excited state(s) and to the ground state of the product nucleus. Column definitions for the table are as follows.

Column heading Definition
Elem. or Isot. For elements, atomic number and chemical symbol are listed. For nuclides, mass number and chemical symbol are listed. Isomers are indicated by the notation m, m1, or m2
Natural abundance Natural abundance, in atom percent
Half-life Half-life in decimal notation. μs = microsecond; ms = millisecond; s = second; m = minute; h = hour; d = day; y = year
Thermal neut. cross section Cross sections for neutron capture reactions in units of barns (10–24 cm2) or millibarns (mb); proton, alpha production, and fission reactions are designated by σp, σα, σf , respectively; separate values are listed for isomeric production
Resonance integral Resonance integrals for neutron capture reactions in barns (10–24 cm2) or millibarns (mb); proton, alpha production, and fission reactions are designated by RIp, RIα, RIf, respectively; separate values are listed for isomeric production
Coh. scat. length Bound coherent scattering lengths for neutron scattering reactions in units of femtometers (fm), which is equal to fermis (10–13 cm)
σ(30 keV) Maxw. avg. Astrophysical cross sections, averaged over a stellar neutron Maxwellian spectrum characterized by a thermal energy of 30 keV, expressed in barns (10–24 cm2), millibarns (mb), or microbarns (μb)

General Nuclear Data References

The following references represent the major sources of the nuclear data.

  1. Mughabghab, S.F., Divadeenam, M., Holden, N.E.; Neutron Cross Sections, Vol. 1 Neutron Resonance Parameters and Thermal Cross Sections, Part A, Z = 1–60. Academic Press, New York (1981); Mughabghab, S.F.; Part B, Z = 61–100. Academic Press, Orlando, FL (1984). [https://doi.org/10.1016/B978-0-12-509701-7.50006-7]
  2. Holden, N. E., Fifty Years with Nuclear Fission Conference, Washington, DC, Gaithersburg, MD,. April 26–29, 1989, p. 946. American Nuclear Society, LaGrange Park, IL (1989).
  3. Tuli, J. K., Nuclear Wallet Cards, Brookhaven National Laboratory (January 2000).
  4. Holden, N. E., Half-Lives of Selected Nuclides, Pure & Applied Chemistry 62, 941 (1990). [https://doi.org/10.1351/pac199062050941]
  5. Holden, N. E., Hoffman, D.C.; Spontaneous Fission Half-Lives for Ground State Nuclides, Pure & Applied Chemistry 72, 1525 (2000). [https://doi.org/10.1351/pac200072081525]
  6. Koester, L., Rauch, H., Seymann, E., Neutron Scattering Lengths: A Survey of Experimental Data and Methods, Atomic Data Nuclear Data Tables 49, 65 (1991). [https://doi.org/10.1016/0092-640X(91)90012-S]
  7. Sears, V. F., Neutron Scattering Lengths and Cross Sections, Neutron News 3, (3), 26 (1992). [https://doi.org/10.1080/10448639208218770]
  8. Bao, Z. Y., Beer, H., Käpeler, F., Voss, F., Wisshak, K., Raucher, T., Neutron Cross Sections for Nucleo-Synthesis Studies, Atomic Data Nuclear Data Tables 76, 70 (2000). [https://doi.org/10.1006/adnd.2000.0838]
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Neutron Scattering and Absorption Properties



ElementElem.or Isot.Natural abundance/%Half-lifeThermal neut. cross section/barnsResonance integral/barnsCoh. scat. length/fmσ(30 keV) Maxw. avg./barns
Continued on next page...
Hydrogen1H0.332(2)0.149(1)3.739(1)
Hydrogen1H99.9885(70)>2.8×1023 y0.332(2)0.149(1) 3.741(1)0.25(2) mb*
Hydrogen2H0.0115(70)0.51(1)mb0.23(2) mb6.671(4)2.1(4) µb
Hydrogen3H12.33 y< 6. µb4.79(3)
Helium2He< 0.053.26(3)
Helium3He0.000134(3)σp = 5.33(1)×103RIp = 2.39(1)×1035.74(7)
Helium3He0.05(1) mb8.(1) µb*
Helium4He99.999867(3)3.26(3)
Lithium3Li71.(2)32.(1) 1.90(2)
Lithium6Li7.59(4)σt = 9.4(1)×102RIt = 422.(4)2.0(1)σt ≈ 1.
Lithium6Li39.(5) mb17.(2) mb0.06(1) mb*
Lithium7Li92.41(4)45.(5) mb20.(2) mb 2.22(2)42.(3) µb
Lithium8Li0.84 s< ≈ 5.5 µb
Beryllium4Be8.8(4) mb3.9(2) mb7.79(1)
Beryllium7Be53.28 dσp = 3.9(1)×104RIp = 1.75(5)×104σp = 16(4)*
Beryllium7Beσα ≈ 0.1
Beryllium9Be100.8.8(4) mb3.9(2) mb7.79(1)
Beryllium10Be1.52×106 y<1. mb
Boron5B7.6(1)×1023.4(1)×1025.30(4)

  • * Extrapolated value.


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