Abstract
The nuclear resonant scattering technique for γ-rays was used to measure the lifetime of the 364 keV level in 131Xe, and to determine the mixing ratio of the E2 + M1 ground state transition. Doppler broadening of the emission level, which compensates the recoil losses of the 364 keV gamma ray, is provided by the preceding 608 keV β--transition from 131I when the source, methyl iodide, is in the gaseous phase, the scatterer being solid xenon. The measured lifetime of (1.4 ± 0.4) × 10-11 sec is in agreement with Sunyar's estimated value of 2 × 10-11 sec. A 0.34% M1 admixture was found for the 364keV transition, and is of the order expected from internal conversion coefficient measurements.
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