The in-medium isovector pi N amplitude from low energy pion scattering

Details The in-medium isovector pi N amplitude from low energy pion scattering The in-medium isovector pi N amplitude from low energy pion scattering

2004-04-26

arxiv.org/abs/nucl-ex/0404031v2

Phys.Rev.Lett. 93 (2004) 122302

Physics

Nuclear Physics

Nuclear Experiment

9 pages, 2 figures. Minor changes, to appear in PRL

Scientific paper

10.1103/PhysRevLett.93.122302

Differential cross sections for elastic scattering of 21.5 MeV positive and negative pions by Si, Ca, Ni and Zr have been measured as part of a study of the pion-nucleus potential across threshold. The `anomalous' repulsion in the s-wave term was observed, as is the case with pionic atoms. The extra repulsion can be accounted for by a chiral-motivated model where the pion decay constant is modified in the medium. Unlike in pionic atoms, the anomaly cannot be removed by merely introducing an empirical on-shell energy dependence.

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