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Gamma-ray Emission above 20 MeV from the Crab Nebula and NP 0532

Nature Physical Science volume 242, pages 117–120 (1973)Cite this article

Abstract

WE have investigated the gamma-ray emission from the Crab Nebula in a series of balloon flights of a multiplate spark chamber triggered by a Čerenkov detector-scintillator coincidence system1. The previously quoted gamma-ray energy threshold for pulsed emission from the Nebula and NP 0532 (refs. 1, 2) is ∼50 MeV; a detailed investigation of the telescope efficiency as a function of energy has now shown that the efficiency extends down to 20 MeV.

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References

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Authors and Affiliations

  1. Service d'Electronique Physique, CEN, Saclay

    B. PARLIER, B. AGRINIER, M. FORICHON & J. P. LERAY

  2. Laboratorio Fisica Cosmica e Tecnologie Relative, CNR, Milano

    G. BOELLA & L. MARASCHI

  3. Istituto Fisica Università, Palermo

    R. BUCCHERI & N. R. ROBBA

  4. Laboratorio Fisica Cosmica e Tecnologie Relative, CNR, and Istituto Fisica Università, Palermo

    L. SCARSI

Authors
  1. B. PARLIER
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  2. B. AGRINIER
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  3. M. FORICHON
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  4. J. P. LERAY
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  5. G. BOELLA
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  6. L. MARASCHI
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  7. R. BUCCHERI
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  8. N. R. ROBBA
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  9. L. SCARSI
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PARLIER, B., AGRINIER, B., FORICHON, M. et al. Gamma-ray Emission above 20 MeV from the Crab Nebula and NP 0532. Nature Physical Science 242, 117–120 (1973). https://doi.org/10.1038/physci242117a0

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