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.",
    keywords = "coherent gamma fields, gamma echo, gamma-NMR double resonance",
    author = "Panu Helist{\"o} and I. Tittonen",
    year = "2001",
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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

    TY - JOUR

    T1 - Experiments with Coherent γ Fields

    T2 - Gamma Echo and Related Phenomena

    AU - Helistö, Panu

    AU - Tittonen, I.

    PY - 2001

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    N2 - 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.

    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.

    KW - coherent gamma fields

    KW - gamma echo

    KW - gamma-NMR double resonance

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    JF - Hyperfine Interactions

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