Status and Issues in the Development of a Gamma-Ray Laser

Collins, C. B.; Carroll, J. J.; Taylor, K. N.; Sinor, T. W.; Cai, Hong; Standifird, J.; Richmond, D.

doi:10.1007/978-1-4615-3324-5_15

Cited by 4 publications

(2 citation statements)

References 27 publications

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“…The above systematics arguments suggested that intermediate states near 2.8 MeV might be readily available for triggered gamma emission in isotopes near A ∼ 180. Recognizing [10,25] that the 31-year isomer 178m2 Hf lies at 2.446 MeV, this nuclide became the primary candidate for testing. It was not possible to specifically identify many energies that might be suitable for triggering with photons, but the limited information available 2 from the Orsay experiments only seemed consistent with triggering at less than 350 keV.…”

Section: Development Of Systematicsmentioning

confidence: 99%

An experimental perspective on triggered gamma emission from nuclear isomers

Carroll

2004

Laser Phys. Lett.

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The study of triggered depopulation of nuclear isomers, with accompanying gamma emission, is a rapidlychanging field that is only now attaining some degree of maturity. Because isomer decays via electromagnetic transitions are strongly inhibited, the interaction of these levels with externallyproduced photons provides an important probe of nuclear structure. Also, since some isomers may store large amounts of energy for long times, a number of applications have been proposed, including the creation of a gamma-ray laser. Early experiments conclusively demonstrated triggering of the 10 15 -year isomer of 180 Ta, but even a partial correlation of the effect with known levels could only be obtained recently. Investigations of triggering for the 31-year isomer of 178 Hf were initially guided just by systematics and experiments are characterized by considerable controversy. Against this background, the field of triggered gamma emission is entering a new phase in which improved level data allow targeting of specific potentially-useful transitions. This paper summarizes the current state-of-the-art and discusses the changing nature of the field.

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Section: Development Of Systematicsmentioning

confidence: 99%

An experimental perspective on triggered gamma emission from nuclear isomers

Carroll

2004

Laser Phys. Lett.

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“…However, it is not certain that Mö ssbauer conditions can be preserved with a radiative pump, even if its bandwidth can be comparable with the as yet unknown width of the K-mixing resonance. Collins et al (1992 describe a hypothetical scenario in which a diamond host 0.67 m thick, doped to 10% with an isomeric parent for a 100-keV lasing transition, is pumped to the K-mixing level by absorption of 30-keV bremsstrahlung. Collins and Carroll assume that (1) the resonant transfer pump band is 1 eV wide; (2) the Borrmann effect reduces nonresonant absorption tenfold; (3) '' .…”

Section: E Difficultiesmentioning

confidence: 99%

Recoilless gamma-ray lasers

Baldwin

Solem

1997

Rev. Mod. Phys.

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This review is addressed to the development of lasers that might generate coherent radiation at ultrashort wavelengths by stimulating recoilless nuclear transitions in solids. First, the authors review the basic physics of stimulated emission, superradiance and the kinetics of lasing, with particular attention to those aspects that characterize recoilless nuclear transitions in solid hosts. Then they classify the various approaches to pumping that have been proposed for resolving the ''graser dilemma''-that the pump can destroy the conditions essential to gain-and discuss the general requirements for specification of an active nuclide and its solid host. The authors then classify and review those graser systems proposed since 1980 and prior to July 1996 in the published literature of the field, namely, (1) those that would pump directly, either with radiation or with intense bursts of neutrons; (2) those that would pump indirectly by first generating a nuclear isomer; (3) those that would eliminate the need for population inversion; and (4) several miscellaneous concepts. The significance of recent relevant experiments is described and discussed, and, finally, recommendations for future research are made. [S0034-6861(97) CONTENTS

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Status of research in gamma-ray lasers

Solem

1998

APH N.S., Heavy Ion Physics

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Status and Issues in the Development of a Gamma-Ray Laser

Cited by 4 publications

References 27 publications

An experimental perspective on triggered gamma emission from nuclear isomers

An experimental perspective on triggered gamma emission from nuclear isomers

Recoilless gamma-ray lasers

Status of research in gamma-ray lasers

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