Elsevier

Nuclear Physics B

Volume 142, Issue 4, 2 October 1978, Pages 365-380
Nuclear Physics B

Elastic scattering and coherent single pion production in proton-helium interactions at 18.6 GeV/c

https://doi.org/10.1016/0550-3213(78)90220-1Get rights and content

Abstract

Proton-helium elastic scattering and coherent single-pion production have been studied at 18.6 GeV/c in the four-momentum transfer region (−0.06, −0.17) GeV/c2. The elastic t-distribution has a somewhat steeper slope than is predicted by the Glauber approximation. The invariant-mass distribution of the Nπ system agrees with the double Regge-pole model except at about 1.65 GeV/c2 where an enhancement presumably due to N∗ resonances is seen. The model also predicts the correct magnitude of the slope for nπ+α events. By using our cross sections at t′ = −0.06 (GeV/c)2 where the impulse approximation should be valid, the isospin-zero exchange elementary cross section for the nπ+ production is evaluated. The inelastic angular distributions are consistent with several spinparity states contributing at all Nπ masses.

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    • Cited by (1)

    ☆

    CERN and the Gustaf Werner Institute, Uppsala, Sweden.

    ☆☆

    CERN, Geneva, Switzerland.

    ☆☆☆

    The Gustaf Werner Institute, Uppsala, Sweden.

    +

    The Rutherford High Energy Laboratory, Chilton, England. On leave from the Institute for Nuclear Research, Warsaw, Poland.

    ++

    On leave from the Fermi National Accelerator Laboratory, Batavia, USA.

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