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Neutron diffraction dissociation and Coulomb dissociation from nuclei
Longo, Michael J.; Jones, Lawrence W.; O'Brien, Donald D.; Vander Velde, John Christian; Davis, Michael B.; Gibbard, Bruce G.; Kreisler, Michael N.
1971-10-18
Citation:Longo, M. J., Jones, L. W., O'Brien, D. D., Vandervelde, J. C., Davis, M. B., Gibbard, B. G., Kreisler, M. N. (1971/10/18)."Neutron diffraction dissociation and Coulomb dissociation from nuclei." Physics Letters B 36(6): 560-562. <http://hdl.handle.net/2027.42/33547>
Abstract: Preliminary results of a spark-chamber experiment are presented on the reaction n+A --> (p + [pi]-) + A where the (p[pi]-) pair is produced coherently off the nucleus A. A 0[deg] neutron beam derived from a beryllium target in the external beam of the Brookhaven proton synchrotron was used. The mean effective momentum of the neutrons was about 23 GeV/c. Forward-going (p[pi]-) pairs were detected in a wire spark-chamber spectrometer and the momentum and angles of each particle were determined. The observation of a sharp forward peak (of width appropriate to the nuclear radius) indicated that a large fraction of the events were produced coherently.Mass spectra for coherently produced events from carbon, copper and lead targets are presented. The lead data show a peak at low masses due to Coulomb production of the [Delta](1236). The most striking result of the experiment is the lack of any appreciable production of the well-established nucleon isobars.
