Abstract
Using gaseous sources of Tc2O7 containing the radioactive isotopes94Tc,95Tc and96Tc, levels at 871.0keV (94Mo), 765.8, 820.6, 947.8, 1074.0keV (95Mo) and 778.3keV (96Mo) have been excited. From the effective cross sections for nuclear resonance scattering and from the lifetimes of the 947.8, 1074.0 and 778.3keV levels known from Coulomb excitation experiments the profiles of theγ-lines have been determined. A broadening of theγ-lines due to Coulomb explosion of the molecules has been observed. Making use of the line profiles, lifetimes ofΤ=(6.4±1.0) ps andΤ=(0.90 ± 0.20) ps have been determined for the 765.8 and 820.6keV levels, respectively. The angular distribution of the resonantly scattered radiation yields an amplitude ratioδ for the mixed M1 E2 765.8keV transition ofδ=0.14 +0.08−0.009 . TheB(E2) from a Coulomb excitation experiment and the lifetimeΤ from the present experiment yield ¦δ¦=0.07±0.01 for the 820.6keV transition.
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The authors are indebted to Professor A. Flammersfeld for the support of this work. They wish to express their gratitude to Dr. L. Ziegeler for his help in the chemical preparation.
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Schumacher, M., Rullhusen, P. Nuclear resonance fluorescence in94Mo,95Mo and96Mo. Z Physik A 282, 353–358 (1977). https://doi.org/10.1007/BF01434288
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DOI: https://doi.org/10.1007/BF01434288