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• W2090274068 abstract "A successful unified description of $bar p$ nuclear interactions near E=0 is achieved using a $bar p$ optical potential within a folding model, $V_{{rm opt}} sim bar v * {rho}$, where a $bar p p$ potential $bar v$ is folded with the nuclear density $rho$. The potential $bar v$ fits very well the measured $bar p p$ annihilation cross sections at low energies ($p_L < 200$ MeV/c) and the $1s$ and $2p$ spin-averaged level shifts and widths for the $bar p$H atom. The density-folded optical potential $V_{{rm opt}}$ reproduces satisfactorily the strong-interaction level shifts and widths over the entire periodic table, for $A > 10$, as well as the few low energy $bar p$ annihilation cross sections measured on Ne. Both $bar v$ and $V_{{rm opt}}$ are found to be highly absorptive, which leads to a saturation of reaction cross sections in hydrogen and on nuclei. Predictions are made for $bar p$ annihilation cross sections over the entire periodic table at these very low energies and the systematics of the calculated cross sections as function of $A$, $Z$ and $E$ is discussed and explained in terms of a Coulomb-modified strong-absorption model. Finally, optical potentials which fit simultaneously low-energy $bar p - ^4$He observables for $E < 0$ as well as for $E > 0$ are used to assess the reliability of extracting Coulomb modified $bar p$ nuclear scattering lengths directly from the data. The relationship between different kinds of scattering lengths is discussed and previously published systematics of the $bar p$ nuclear scattering lengths is updated." @default.
• W2090274068 created "2016-06-24" @default.
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• W2090274068 date "2001-07-01" @default.
• W2090274068 modified "2023-10-16" @default.
• W2090274068 title "Unified optical-model approach to low-energy antiproton annihilation on nuclei and to antiprotonic atoms" @default.
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• W2090274068 doi "https://doi.org/10.1016/s0375-9474(00)00608-4" @default.
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