Calibration of a gamma ray astronomy telescope in the 5–50 MeV energy range

Lavigne, J. M.; Niel, M.; Védrenne, G.; Doulade, C.; Giordano, G.; Agrinier, B.; Bonfand, E.; Andrejol, J.; Courtois, Jean-Philippe; Gorisse, M.; Lecomte, Aziliz; Parlier, B.; Mougin, B.

doi:10.1016/0167-5087(82)90160-0

Nuclear Instruments and Methods in Physics Research

1982

DOI: 10.1016/0167-5087(82)90160-0

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Calibration of a gamma ray astronomy telescope in the 5–50 MeV energy range

J. M. Lavigne

M. Niel

G. Védrenne

et al.

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Cited by 3 publications

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“…Since rejecting doubles also rejects grazing incidence singles, the field of view is reduced.The selection of single events for energies between 4 and 10 MeV eliminates the background from backscattered gamma rays with energies below 7 MeV. For the energy range above 10 MeV the background due to doubles is eliminated, since these events have energies less than 10 MeV[Lavigne et al, 1982a]. 3.…”

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confidence: 99%

Measurement of atmospheric and diffuse radiation using a time‐of‐flight telescope

Neri¹,

Agrinier²,

Lavigne³

1992

J. Geophys. Res.

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A time‐of‐flight telescope constructed by the Commissariat à l'Energie Atomique (Saclay) and the Centre d'Etude Spatiale des Rayonnements (Toulouse) was used for gamma ray flux measurements. The atmospheric component was studied from balloon as a function of the pressure and the energy. Gamma ray fluxes were also measured with the telescope axis oriented in various directions and with the experiment inverted. The atmospheric and diffuse components were determined in various energy ranges.

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mentioning

confidence: 99%

Measurement of atmospheric and diffuse radiation using a time‐of‐flight telescope

Neri¹,

Agrinier²,

Lavigne³

1992

J. Geophys. Res.

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“…The values of the geometric factor given in Table 1 are thus valid for an aperture angle of 15 ø . The inaccuracy in the energy measurement is due to the fact that this measurement is made by using the scattering of the electrons in the chamber [Lavigne et al, 1982a]. The atmospheric 7 ray flux increases greatly when the arrival direction becomes horizontal [Ling, 1975;Schb'nfelder et al, 1977;Ryan, 1977;Thompson, 1981].…”

mentioning

confidence: 99%

Atmospheric gamma radiation: A comparison of experimental results at 4.5 GV and 11.7 GV

Lavigne¹,

Niel²,

Védrenne³

et al. 1984

J. Geophys. Res.

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“Agathe,” a joint Commissariat à l'Energie Atomique (Saclay) and Centre d'Etude Spatiale des Rayonnements (Toulouse) experiment is a spark chamber for gamma ray measurements in the E > 4 MeV energy range. It was used to measure the flux of atmospheric photons at λ = −23° geographic latitude (rigidity 11.7 GV) during two flights from Brazil, in the course of a campaign organized by the Centre National d'Etudes Spatiales, the French space agency. The results are compared to those obtained from flights of the engineering model of Agathe and a model for a time of flight system, tested to evaluate improvements for the Agathe experiment. The following results were obtained for the energy ranges 4–10 MeV, 10–25 MeV, and >25 MeV: (1) Determination of the atmospheric gamma ray fluxes or count rate as a function of pressure altitude; in these energy ranges the downward atmospheric flux is proportional to Pα with α ≃ 1. (2) The determination of the atmospheric spectrum at λ = −23° in Brazil and at λ = 40° in the northern hemisphere; in Brazil the downward atmospheric spectrum can be represented by Φ(E) = 2.4×10−3 E−1.4 photons/cm² s sr MeV g/cm² in the 4‐ to 100‐MeV energy range and Φ(E)′ = 2.3×10−2 E−1.9 photons/cm² s sr MeV g/cm² for E > 100 MeV energy range. (3) The determination of the ratio between the fluxes measured in Brazil and in the northern hemisphere; this ratio is 1.8±0.2. It has been shown that the fluxes of downward and upward moving gamma rays are equal at a pressure of about 40 mbar. The dependence of the downward moving fluxes as a function of the pressure is different from that published by Ling. But, if we assume that the atmospheric component is isotropic at 40 mbar, the experimental fluxes determined from the experiments described here agree with the measured fluxes taken into account by Ling in these calculations for the 4‐ to 10‐MeV energy range. Key words: gamma radiation and atmospheric component.

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Diffuse and atmospheric photon fluxes measured with a time of flight telescope

Neri¹,

Lavigne²,

Agrinier

1986

Advances in Space Research

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Calibration of a gamma ray astronomy telescope in the 5–50 MeV energy range

Cited by 3 publications

References 5 publications

Measurement of atmospheric and diffuse radiation using a time‐of‐flight telescope

Measurement of atmospheric and diffuse radiation using a time‐of‐flight telescope

Atmospheric gamma radiation: A comparison of experimental results at 4.5 GV and 11.7 GV

Diffuse and atmospheric photon fluxes measured with a time of flight telescope

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