Technical notes. Measurement of cross sections for the 7Li(n, n'γ)7Li reaction from 0.57 to 4 MeV

Cross section ratios for production of the 0.478-MeV gamma ray by the 7Li(n,n'gamma)7Li reaction relative to fast-neutron fission of 235U have been measured from 0.57 to 4 MeV with an estimated error of +-8 percent. The measurements were made using a shielded Ge(Li) detector, a fission detector, and time-of-flight techniques. The measured ratios and ENDF/B-IV fission cross sections were used to compute cross sections for the 7Li(n,n'gamma)7Li reaction. These values are compared with corresponding reported experimental values and with the ENDF/B-IV evaluation for this reaction. The available data tend to fall into two distinct groups that disagree by as much as 25 percent at some energies. The results of the present work are consistent with the group that favors smaller cross sections at most energies