Neutron-Induced Fission Cross Section of Am-242m
Feb 20, 1968
7 pages
Published in:
- Phys.Rev. 166 (1968) 1219-1226
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Abstract: (APS)
The neutron-induced fission cross section of Am242m has been measured from 0.02 eV to 6 MeV by the time-of-flight method at the Livermore 30-MeV linear electron accelerator. The data are normalized at 0.0253 eV to a value of 6600 b measured in a reactor thermal-neutron flux. The cross section at 0.2 eV is 4700 b; at 1 eV it is 540 b; and at 4 MeV it is 2.1 b. The data are analyzed to obtain values for the neutron strength function 〈Γn0D〉 of 1.4×10−4, the level spacing D=1.2 eV, and the quantity 2π〈ΓfD〉=2.5. All three quantities are quoted per spin state. The high cross section at low energies can be attributed to the unusually high value for 2π〈ΓfD〉, and to the existence of a very large resonance at 0.173 eV. The fission cross section of Am241 also was measured in the MeV region and found to be 1.96±0.2 b at 2.5 MeV.References(15)
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