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This report focuses upon a breakthrough recently realized along the more complex direction toward the coherent pumping of a gamma-ray laser. The intent is to mix the quantum properties of long-lived nuclear states with those able to radiate freely. In this way the metastability of an isomeric state could be switched off. The critical experiment is to show that some laboratory level of coherent input power can affect the properties of a nuclear level. Reported here are the details of a series of experiments which clearly demonstrated that large levels of modulation of the phases of nuclear states can be obtained with relatively modest input powers. Now many more critical experiments become possible even along this more complex path toward a gamma-ray laser. Also reported here are the most recent advances we have made in the preparation of the thin film diamond materials. Efficacy of the unique laser plasma process we describe is so great that it already has become clear that applications will range far beyond the support of this gamma-ray laser project. Table of Contents: A Laser Plasma Source of Amorphic Diamond; and Observations Of Large Scale Nuclear Phase Modulation Effects.
Recent approaches to the problem of the gamma-ray laser have focused upon upconversion techniques in which metastable nuclei are pumped with long wavelength radiation. At the nuclear level the storage of energy can approach tera-Joules (10 to the 12th power J) per liter for thousands of years. However, any plan to use such a resource for a gamma-ray laser poses problems of a broad interdisciplinary nature requiring the fusion of concepts taken from relatively unrelated fields of physics. Since 1978 we have pursued an approach for the upconversion of longer wavelength radiation incident upon isomeric nuclear populations that can avoid many of the difficulties encountered with traditional concepts of single photon pumping. Recent experiments have confirmed the general feasibility and have indicated that a gamma-ray laser is feasible if the right combination of energy levels and branching ratios exists in some real material. Resolution of the question of the feasibility of a gamma-ray laser now rests upon the determination of: 1) the identity of the best candidate, 2) the threshold level of laser output, and 3) the upconversion driver for that material.
Recent approaches to the problem of the gamma-ray laser have focused upon upconversion techniques in which metastable nuclei are pumped with long wavelength radiation. At the nuclear level the storage of energy can approach tera-Joules per liter for thousands of years. However, any plan to use such a resource for a gamma-ray laser poses problems of a broad interdisciplinary nature requiring the fusion of concepts taken from relatively unrelated fields of physics. Contents: Photoexcitation of nuclear isomers with the DNA/aurora nuclear; and Adaptation of a fixed energy electron accelerator to produce variable endpoint bremsstrahlung.
Includes all works deriving from DOE, other related government-sponsored information and foreign nonnuclear information.