Experiments with Coherent γ Fields

Gamma Echo and Related Phenomena

Panu Helistö, I. Tittonen

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

The role of coherence played in several phenomena in the gamma energy region has not been well recognised until recently. The Mössbauer source nuclei are noncorrelated, but the absorber response has a well-defined phase relation to the instantaneous source radiation within the relaxation time of the nuclear system. By rapidly changing this phase relation with mechanical displacement, new types of coherent transients in gamma regime have been observed. The gamma echo, replicating and amplifying the enchained decay through a thick sample, is perhaps the best known example of these phenomena. In addition, a simple gamma-ray interferometer based on rapid transit through the resonance has been demonstrated. Fast and intense gamma pulses have been obtained with stepwise phase modulation. These and the gamma-NMR double resonance experiments are reviewed in this paper.
Original languageEnglish
Pages (from-to)167-190
Number of pages24
JournalHyperfine Interactions
Volume135
Issue number1-4
DOIs
Publication statusPublished - 2001
MoE publication typeA1 Journal article-refereed

Fingerprint

echoes
Rapid transit
Phase modulation
transit
radiation sources
phase modulation
Gamma rays
Interferometers
Relaxation time
absorbers
interferometers
relaxation time
Experiments
Nuclear magnetic resonance
gamma rays
Radiation
nuclear magnetic resonance
nuclei
decay
pulses

Keywords

  • coherent gamma fields
  • gamma echo
  • gamma-NMR double resonance

Cite this

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title = "Experiments with Coherent γ Fields: Gamma Echo and Related Phenomena",
abstract = "The role of coherence played in several phenomena in the gamma energy region has not been well recognised until recently. The M{\"o}ssbauer source nuclei are noncorrelated, but the absorber response has a well-defined phase relation to the instantaneous source radiation within the relaxation time of the nuclear system. By rapidly changing this phase relation with mechanical displacement, new types of coherent transients in gamma regime have been observed. The gamma echo, replicating and amplifying the enchained decay through a thick sample, is perhaps the best known example of these phenomena. In addition, a simple gamma-ray interferometer based on rapid transit through the resonance has been demonstrated. Fast and intense gamma pulses have been obtained with stepwise phase modulation. These and the gamma-NMR double resonance experiments are reviewed in this paper.",
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}

Experiments with Coherent γ Fields : Gamma Echo and Related Phenomena. / Helistö, Panu; Tittonen, I.

In: Hyperfine Interactions, Vol. 135, No. 1-4, 2001, p. 167-190.

Research output: Contribution to journalArticleScientificpeer-review

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T2 - Gamma Echo and Related Phenomena

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AU - Tittonen, I.

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AB - The role of coherence played in several phenomena in the gamma energy region has not been well recognised until recently. The Mössbauer source nuclei are noncorrelated, but the absorber response has a well-defined phase relation to the instantaneous source radiation within the relaxation time of the nuclear system. By rapidly changing this phase relation with mechanical displacement, new types of coherent transients in gamma regime have been observed. The gamma echo, replicating and amplifying the enchained decay through a thick sample, is perhaps the best known example of these phenomena. In addition, a simple gamma-ray interferometer based on rapid transit through the resonance has been demonstrated. Fast and intense gamma pulses have been obtained with stepwise phase modulation. These and the gamma-NMR double resonance experiments are reviewed in this paper.

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KW - gamma echo

KW - gamma-NMR double resonance

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