Abstract
The mean life of the lowest 21/2(+ level of89Zr has been measured with a pulsed7Li beam and the85Rb(7Li, 3n)89Zr reaction.
The mean life is τ=7.39 ± 0.23 ns and the reduced transition probability to the 17/2+ state isB(E2)=73±2e2fm4. The comparison with shell-model predictions requires a large value of the effective chargee p ≈ 2) to account for the experimental result.
The mean life of the 13/2− state has also been measured and results to be τ=3.22±0.17ns.
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References
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We are indebted to Dr. P. Spolaore and to the Technical Staff of the LNL for assistance and for operation of the Tandem Accelerator, and to Dr. P. Del Carmine for his skillful help during the measurements.