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

Apr, 2004

10 pages

Published in:

Phys.Rev.Lett. 93 (2004) 122302

e-Print:

nucl-ex/0404031 [nucl-ex]

DOI:

10.1103/PhysRevLett.93.122302

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Abstract:

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.

25.80.Dj
21.30.Fe
12.39.Fe
13.75.Gx
pion-nucleus scattering
nuclear forces
pion decay
pionic atoms
chiral symmetries
pion-baryon scattering

References(24)

Figures(0)

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