Effects of Zero-Ranged Propagations in the Relativistic Nuclear Scattering Theories : Nuclear Physics

概要

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The structures of the Breit and Duffin-Kemmer-Petiau (DKP) propagators and their effects on the effective optical potentials for deuteron-nucleus scattering at intermediate energy are investigated. Suppressing the zero-ranged propagations, γ_1^0&otime; γ_2^0/(2E(K)) in the Breit and -1/(2M_d) in the DKP propagator, the relativistic characters of the potentials, the wine-bottle-bottom shape in the central potentials and the enhanced spin-orbit strengths, disappear in both the approaches. If the other zero-ranged contributions are excluded from the propagators further, these relativistic characters are largely recovered. This means that the two zero-ranged propagations in the Breit or DKP propagator have opposite effects on the potentials, which are largely cancelled with each other. However, this cancellation for the central potential in the DKP approach is not sufficient to be saved from the difficulties associated with zero-ranged propagations while the spin-orbit potential in the Breit approach is too weak to reproduce polarization observables. At present, we cannot choose between both the approaches.
理論物理学刊行会の論文
1991-01-25