Density dependence of the s-wave repulsion in pionic atoms

Details Density dependence of the s-wave repulsion in pionic atoms Density dependence of the s-wave repulsion in pionic atoms

2002-05-20

arxiv.org/abs/nucl-th/0205054v2

Nucl.Phys. A710 (2002) 117-130

Physics

Nuclear Physics

Nuclear Theory

18 pages, 5 figures, version 2 (extended)

Scientific paper

10.1016/S0375-9474(02)01126-0

Several mechanisms of density dependence of the s-wave repulsion in pionic atoms, beyond the conventional model, are tested by parameter fits to a large (106 points) set of data from $^{16}$O to $^{238}$U, including `deeply bound' states in $^{205}$Pb. Special attention is paid to the proper choice of nuclear density distributions. A density-dependent isovector scattering amplitude suggested recently by Weise to result from a density dependence of the pion decay constant is introduced and found to account for most of the so-called anomalous repulsion. The presence of such an effect might indicate partial chiral symmetry restoration in dense matter. The anomalous repulsion is fully accounted for when an additional relativistic impulse approximation term is included in the potential.

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