Observation of Pionic 1s States in Sn Nuclei and Its Implications on Chiral Symmetry Restoration

K. Suzuki; M. Fujita; H. Geissel; H. Gilg; A. Gillitzer; R. S. Hayano; S. Hirenzaki; K. Itahashi; M. Iwasaki; P. Kienle; M. Matos; G. Münzenberg; T. Ohtsubo; M. Sato; M. Shindo; T. Suzuki; H. Weick; M. Winkler; T. Yamazaki; T. Yoneyama

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Observation of Pionic 1s States in Sn Nuclei and Its Implications on Chiral Symmetry Restoration

Progress of Theoretical Physics Supplement (2003) 149 32-41

DOI: 10.1143/PTPS.149.32

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Abstract

We observed deeply bound π- 1s states in 115,119,123sn for the first time in 116,120,124Sn(d, 3He) reactions at recoil free conditions to determine the 1s binding energies and the widths precisely. A preliminary result is used to deduce the isovector scattering amplitude as b1 = 0.115 ± 0.005 m π-1. The observed enhancement of b1 over the free πN value infers 35% reduction of fπ2 at the normal nuclear density, ρ = 0.17 fm-3.

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Suzuki, K., Fujita, M., Geissel, H., Gilg, H., Gillitzer, A., Hayano, R. S., … Yoneyama, T. (2003). Observation of Pionic 1s States in Sn Nuclei and Its Implications on Chiral Symmetry Restoration. In Progress of Theoretical Physics Supplement (Vol. 149, pp. 32–41). Yukawa Institute for Theoretical Physics. https://doi.org/10.1143/PTPS.149.32

Observation of Pionic 1s States in Sn Nuclei and Its Implications on Chiral Symmetry Restoration

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