Diffraction dissociation and Coulomb dissociation of high-energy neutrons by nuclei

doi:10.1016/0550-3213(74)90301-0

Nuclear Physics B

Volume 77, Issue 1, 25 July 1974, Pages 1-34

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Abstract

We present the results of a spark chamber experiment in which we studied the reaction n + A → (p + π⁻) + A′, where the (pπ⁻) pair is coherently produced off carbon, copper, and lead nuclei. Between 5 000 and 55 000 good events were collected with each target. Incident neutrons in the momentum range 10 to 28 GeV/c were used. Forward-going (pπ⁻) pairs from the above reaction were detected in a wire spark chamber spectrometer which measured the momentum and angles of each particle. The observation of a sharp forward peak (of width appropriate to the nuclear radius) indicated that a large fraction of the events were coherently produced. There is no evidence for any appreciable production of the well-established $I = 12$ nucleon isobars; our limits appear to be inconsistent with estimates based on a straightforward extrapolation of pp data. The lead data show evidence for coulomb production of the Δ (1236). The carbon data indicate a spin $J ⩾ 32$ for the coherently produced (pπ⁻) states with pure $J = 32$ possible. We cannot draw any firm conclusions about helicity conservation. The Drell-Hiida-Deck model does not adequately fit the data, nor is the double-Regge-pole model completely satisfactory.

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^☆: Work supported by the US National Science Foundation Grant GP27394 and the US Atomic Energy Commission.

^∗∗: Now at Physics Department, McGill University, Montreal, Quebec, Canada.

^∗∗∗: Now at Carnegie Institution of Washington, Department of Terrestrial Magnetism, Washington, D.C. 20015.

^‡: Now at Department of Physics and Astronomy, University of Massachusetts, Amherst, Massachusetts 01002.

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Diffraction dissociation and Coulomb dissociation of high-energy neutrons by nuclei☆

Abstract

Phys. Letters

Nucl. Phys.

Phys. Rev. Letters

Phys. Rev. Letters

Phys. Rev. Letters

Phys. Rev.

Phys. Rev. Letters

Methods in subnuclear physics

International School, Herceg-Novi