Fast Reactor Constants

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Nominal one-group constants for a fast reactor
Element or Isotope σγ σf σa σtr ν η
Na 0.0008 0 0.0008 3.3
Al 0.002 0 0.002 3.1
Fe 0.006 0 0.006 2.7
U-235 0.25 1.4 1.65 6.8 2.6 2.2
U-238 0.16 0.095 0.255 6.9 2.6 0.97
Pu-239 0.26 1.85 2.11 6.8 2.98 2.61

All cross sections are in units of "barns"

Source: Reactor Physics Constants, 2nd ed., Argonne National Laboratory report ANL-5800, 1963.

Table 7-5 on page 581

This table also appears in Lamarsh, "Nuclear Reactor Theory," 2nd. Edition (1983), Table 6.1, p. 222.