Observation of the Double Isobaric Analog Transition O18(π+, π)Ne18 at 50 MeV

A. Altman, R. R. Johnson, U. Wienands, N. Hessey, B. M. Barnett, B. M. Forster, N. Grion, D. Mills, F. M. Rozon, G. R. Smith, R. P. Trelle, D. R. Gill, G. Sheffer, and T. Anderl
Phys. Rev. Lett. 55, 1273 – Published 16 September 1985
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Abstract

The angular distribution of the differential cross sections for the transition to the double-isobaric analog state in the reaction O18(π+, π)Ne18 was measured at six angles from 20° to 120°. Extra-polation of the differential cross section results in 5.3±0.5 μb/sr at 0° and an angle-integrated cross section of 16.7±1.2 μb. The forward peaking and magnitude of the cross sections differ from those predicted by simple sequential models and the trends of data at higher energies. The results are compared to recent data for the same transition on C14 at 50 MeV and to a calculation in the six-quark bag model.

  • Received 23 April 1985

DOI:https://doi.org/10.1103/PhysRevLett.55.1273

©1985 American Physical Society

Authors & Affiliations

A. Altman, R. R. Johnson, U. Wienands, N. Hessey, B. M. Barnett, B. M. Forster, N. Grion*, D. Mills, F. M. Rozon, G. R. Smith, and R. P. Trelle

  • Department of Physics, University of British Columbia, Vancouver, British Columbia V6T 2A6, Canada

D. R. Gill and G. Sheffer

  • TRIUMF, Vancouver, British Columbia V6T 2A3, Canada

T. Anderl

  • Institut für Strahlen- und Kernphysik der Universität Bonn, Bonn, West Germany, and Kernforschungsanlage, Jülich, West Germany

  • *Permanent address: INFN, Sezione di Trieste, Italy.

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Vol. 55, Iss. 12 — 16 September 1985

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