Positive pion-nucleus elastic scattering at 40 MeV

M. Blecher, K. Gotow, D. Jenkins, F. Milder, F. E. Bertrand, T. P. Cleary, E. E. Gross, C. A. Ludemann, M. A. Moinester, R. L. Burman, M. Hamm, R. P. Redwine, M. Yates-Williams, S. Dam, C. W. Darden, R. D. Edge, D. J. Malbrough, T. Marks, B. M. Preedom

Research output: Contribution to journalArticlepeer-review

Abstract

Differential cross sections for elastic scattering of 40 MeV positive pions from C12, O16, Ca40, Zr90, and Pb208 were measured at 18 angles in the angular range 25A°-160A°. Relative uncertainties of 2.5% to 7% and overall normalization uncertainties of 4% to 7% were obtained. An optical potential fit of the data indicates that while the magnitudes of the strength parameters, except for Reb1, are different from values obtained from free πN scattering amplitudes, the variation of these magnitudes with target mass is roughly as predicted by the impulse approximation. Coulomb effects, especially in the cases of Zr90 and Pb208, are extremely important, but impossible to unambiguously separate from the strong interaction in the optical model. NUCLEAR REACTIONS Elastic scattering of 40 MeV π+ from C12, O16, Ca40, Zr90, Pb208. Angular distributions: 25A°θL160A°. Optical model and partialwave analysis of cross-section data.

Original languageEnglish
Pages (from-to)1884-1890
Number of pages7
JournalPhysical Review C - Nuclear Physics
Volume20
Issue number5
DOIs
StatePublished - 1979

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