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Energy resolution of experiments with quasimonoenergetic annihilation photons and structure of a giant dipole resonance

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Abstract

Reasons behind the known systematic discrepancies between the results of photonuclear experiments performed with different photon beams are investigated in detail. Information about the cross sections obtained for the reactions 63Cu(γ, n)62Cu and 197Au(γ, xn) at all stages of experiments with quasimonoenergetic photons from relativistic positrons annihilating in flight is studied, and a comparison with the data of experiments with beams of bremsstrahlung gamma radiation is performed. Data obtained in experiments of both types for the reaction 16O(γ, xn) are used in the present analysis. It is shown that the difference procedure typically used experiments with quasimonoenergetic annihilation photons hinders the estimation of the actual energy resolution substantially, thus leading to a considerable distortion of information about the structure of cross sections for photonuclear reactions.

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Authors and Affiliations

  1. Moscow State University, Vorob'evy gory, Moscow, 119899, Russia

    B. S. Ishkhanov, D. S. Rudenko & M. E. Stepanov

  2. Institute of Nuclear Physics, Moscow State University, Vorob'evy gory, Moscow, 119992, Russia

    V. V. Varlamov, B. S. Ishkhanov, D. S. Rudenko & M. E. Stepanov

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  1. V. V. Varlamov
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  2. B. S. Ishkhanov
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  3. D. S. Rudenko
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  4. M. E. Stepanov
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__________

Translated from Yadernaya Fizika, Vol. 67, No. 12, 2004, pp. 2131–2144.

Original Russian Text Copyright © 2004 by Varlamov, Ishkhanov, Rudenko, Stepanov.

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Varlamov, V.V., Ishkhanov, B.S., Rudenko, D.S. et al. Energy resolution of experiments with quasimonoenergetic annihilation photons and structure of a giant dipole resonance. Phys. Atom. Nuclei 67, 2107–2121 (2004). https://doi.org/10.1134/1.1842289

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