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- W2068978043 abstract "Abstract Two-nucleon contributions to the pion-nucleus p-wave optical potential at zero energy, not included in the standard Lorentz-Lorenz treatment, are considered. Such contributions involve coupling the external pion momenta k and k ′, which appear in the optical potential, to form a quadrupole term, and their neglect would appear to be justified only in a strict long-wavelength limit for the pion. The contribution of these quadrupole terms to the observed shifts of pionic atom energy levels is evaluated for 27 Al and 40 Ca, under the assumption of short-range repulsive nucleon-nucleon correlations, and found to constitute roughly between 10% and 15% of the standard Lorentz-Lorenz contribution, or 5% to 7% of the observed shifts." @default.
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- W2068978043 date "1978-12-01" @default.
- W2068978043 modified "2023-09-30" @default.
- W2068978043 title "The quadrupole term of the Lorentz-Lorenz effect in pionic atoms" @default.
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- W2068978043 doi "https://doi.org/10.1016/0375-9474(78)90589-4" @default.
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