Level-Mixing Assisted Tunability of Nuclear Resonance Linewidths for Gamma-Ray Lasers
CINCINNATI UNIV OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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The present approach to a gamma-ray laser is based on the use of a long-lived nuclear state acting both as the storage and lasing level. The present approach requires that nuclear resonant emission occur from long-lived states. We have examined the issue both theoretically and experimentally. Theoretically, as discussed in a recent paper, there are reasons to believe that for long lived states the controlling width for nuclear resonance is not the natural linewidth but the homogeneously broadened relaxation width. This would make observation of the Mossbauer effect from long-lived states less stringent than previously believed. Experimentally, our efforts have continued to focus on observing the Mossbauer effect with the 88 keV level in Ag109 possessing a meanlife of 57.14 seconds. A facility dedicated to these experiments and based on a vibration-free He-closed cycle cryostat which can provide for T-variation and control at cryogenic temperatures was developed during the course of this grant. The first results on the resonant self absorption experiments on this facility are now available and are discussed in section II of the report.
- Lasers and Masers