Coupling effects in proton scattering from ⁴⁰Ca

Mackintosh, R. S. and Keeley, N. (2012). Coupling effects in proton scattering from ⁴⁰Ca. Physical Review C, 85(6) 064603.

DOI: https://doi.org/10.1103/PhysRevC.85.064603

URL: http://dx.doi.org/10.1103/PhysRevC.85.064603

Abstract

Recent studies showed that neutron pickup makes a substantial contribution to the proton optical model potential (OMP) for light, mostly halo, target nuclei. Here, we extend those studies to a more “normal” target nucleus: ⁴⁰Ca. We present coupled reaction channel (CRC) calculations with the coupling of 30.3 MeV incident protons to deuterons and up to 12 states of ³⁹Ca. The proton elastic scattering S matrix from the CRC calculation is subject to S_lj→V(r)+l·s V_SO(r) inversion and the bare potential of the CRC calculation is subtracted, directly yielding a local and L-independent representation of the dynamic polarization potential (DPP). This is appropriate for comparison with phenomenological OMPs and local OMPs derived in local density folding models. The real-central part of the DPP is repulsive and cannot be represented as a uniform normalization of the bare potential, changing the rms radius. A series of model calculations reveal the dependence of the DPP on a range of parameters illuminating (i) departures of nucleon potentials of specific nuclei from global properties, (ii) the generation of repulsion, and (iii) the requirements for all-order CRC and deuteron breakup. Light is thrown on the nonlocality of the underlying DPP.

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