Elsevier

Nuclear Physics B

Volume 59, Issue 1, 13 August 1973, Pages 106-127
Nuclear Physics B

Energy dependence of coherent production of three pions on nuclei between 9 and 15 GeV and comparison with diffractive three-pion production on hydrogen

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Abstract

A total of 34 000 coherent events, produced on different target nuclei and at incident pion momenta from 9 to 15 GeV/c, allows us to discuss the energy dependence of the differential cross section and of the three-pion mass spectrum. The comparison with the optical model is satisfactory. This model is then used to determine the total cross section of the unstable three-pion system on nucleons; the result is a value of about 25 mb. The value of the forward differential cross section on nucleons obtained by application of the optical model shows a tendency to increase with incident energy. A similar increase with energy is found for the forward diffractive cross section of three-pion production on hydrogen; the absolute value of this cross section is somewhat higher than the cross section determined from nuclear targets. Also the mass spectrum on nucleons derived from the present experiment is compatible with that produced on hydrogen. Furthermore, there is no evidence for abundant coherent production of A2 and A3. On the other hand, these two resonances seem to be present in the incoherent background.

References (11)

  • C. Bemporad et al.

    Nucl. Phys.

    (1971)
  • C. Bemporad et al.

    Nucl. Phys.

    (1972)
  • J.V. Beaupré et al.

    Phys. Letters

    (1972)
  • G. Fäldt

    Phys. Rev.

    (1970)
  • K.J. Foley et al.

    Phys. Rev. Letters

    (1967)
There are more references available in the full text version of this article.

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Work supported in part by the Swiss National Science Foundation.

∗∗

Permanent address: Instituto di Fisica dell'Università, Pisa, Italy.

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