## 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 language | English |
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Pages (from-to) | 2607-2620 |

Number of pages | 14 |

Journal | Physical Review C - Nuclear Physics |

Volume | 56 |

Issue number | 5 |

DOIs | |

Publication status | Published - 1997 |

## ASJC Scopus subject areas

- Nuclear and High Energy Physics