Elsevier

Nuclear Physics B

Volume 232, Issue 3, 13 February 1984, Pages 365-397
Nuclear Physics B

Measurement of np elastic scattering at high energies and very small momentum transfers

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Abstract

The np elastic differential cross section has been measured for incident neutron momenta 100–400 GeV/c in the |t| range 6 · 10−6 − 5 · 10−1 (GeV/c)2. The np data of this experiment provide a first direct measurement of the hadronic amplitude for |t| < 10−2 (GeV/c)2, which is consistent with the extrapolations from higher |t| values. Our data for |t| < 10−4 (GeV/c)2 are consistent with a rise which can be attributed to Schwinger scattering, caused by the interaction of the neutron magnetic moment with the proton.

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This work was supported by the Bundesministerium für Forschung und Technologie.

1

We would like to thank many colleagues for their help which made this experiment possible: Dr. Niels Doble and his colleagues for their construction of a very special neutron beam; Dr. H. Wind for his help with fast software for the neutron vertex reconstruction; we also acknowledge valuable support given by Prof. I.V. Chuvilo.

When running the experiment we enjoyed the support of the SPS Operations Group.

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