The temperature effect of resonantly scattered capture γ-rays was studied critically in the temperature range 4.2°K-520°K in 208Pb and in the range 4.2°K-670°K in 62Ni. The γ-source was produced by thermal neutron capture in iron; the energy of the γ-line scattered by 208Pb is7.279 MeV and by 62Ni is 7.646 MeV. The observ intensity from Ni was found to be in good agreement with Lamb theory using a single Debye temperature, θD = 420°K, throughout the whole temperature range. In the case of Pb, the agreement with Lamb theory using θD = 104°K was not as good, and a deviation from theory was observed in the temperature range 30°K-70°K; this deviation is discussed.
- Nuclear reactions