Abstract
Using the Doppler broadening due to thermal agitation and the Doppler shift due to mechanical motion as means of restoring the resonance condition, nuclear resonance fluorescence has been observed from the following isotopes: Pr 141 (145 kev), Hg 198 (411 kev), Hg 199 (209 kev), Hg 202 (439 kev) and Tl 203 (280 kev). From the magnitude of the resonance fluorescence effects the following mean lives τ γ of the gamma-ray transitions have been calculated: (3.0 ± 0.4) × 10 −9, (3.15 ± 0.3) × 10 −11, (1.2 ± 0.4) × 10 −10, (3.4 ± 0.7) × 10 −11 and (4.7 ± 0.8) × 10 −10second. For the even-even nuclei, the angular distribution of the resonance radiation confirmed spin 2 for the excited state, and spin 0 for the ground state.
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