Asymmetries for elastic scattering of [Formula Presented] from polarized [Formula Presented]He at [Formula Presented] resonance energies

M. A. Espy, J. M. O’Donnell, B. Davis, D. Dehnhard, J. L. Langenbrunner, B. Larson, M. Palarczyk, C. M. Riedel, K. Wick, S. Blanchard, G. R. Burleson, W. R. Gibbs, B. Lail, B. Nelson, B. K. Park, Q. Zhao, W. J. Cummings, P. P.J. Delheij, B. K. Jennings, O. HäusserR. Henderson, D. Thiessen, E. Brash, M. K. Jones, B. Brinkmöller, K. Maeda, F. Merrill, C. L. Morris, S. Penttilä, D. Swenson, D. Tupa, C. Bennhold, S. S. Kamalov

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Asymmetries [Formula Presented] for [Formula Presented] and [Formula Presented] elastic scattering from polarized [Formula Presented]He were measured at incident energies passing through the [Formula Presented] nucleon [Formula Presented] or [Formula Presented](1232), resonance. The data were taken at the Clinton P. Anderson Meson Physics Facility using the high-energy pion channel [Formula Presented] and a large acceptance spectrometer to detect the scattered pions. The polarized [Formula Presented]He target, originally developed at TRIUMF, was modified for these experiments by the addition of diode lasers. Completely unexpected negative asymmetries were observed at and below the resonance in [Formula Presented] scattering near [Formula Presented]–60[Formula Presented], which cannot be reproduced by multiple scattering theory and Faddeev wave functions. A hybrid model, which adds a [Formula Presented]-neutron spin-spin interaction term to the conventional calculations, provides a good description of the [Formula Presented] data. For [Formula Presented] scattering this term predicts a negligible effect on [Formula Presented] and the data do not show the anomalous [Formula Presented] seen with [Formula Presented].

Original languageEnglish
Pages (from-to)2607-2620
Number of pages14
JournalPhysical Review C - Nuclear Physics
Volume56
Issue number5
DOIs
Publication statusPublished - 1997
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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