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Published on: July 27, 2018
In-medium isovector piN amplitude from low-energy pion scattering
E Friedman1, M Bauer, J Breitschopf
1Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel. elifried@vms.huji.ac.il
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 the 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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