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Pickup coupling contribution to the optical model potential for 30.3 MeV protons and neutrons on40Ca

Keeley, N. and Mackintosh, R. S. (2019). Pickup coupling contribution to the optical model potential for 30.3 MeV protons and neutrons on40Ca. Physical Review C, 99(3), article no. 034614.

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We study the dynamic polarization potentials (DPPs) for 30.3 MeV protons and neutrons scattering from40Ca that are generated by the coupling to deuteron channels. In this way we resolve unexpected differences from the general properties of such DPPs found in similar cases for lighter targets. It turns out that the contribution of particular states to the real part can change considerably with Q value, coming close to changing sign. One consequence is the surprising result presented in Mackintosh and Keeley [Phys. Rev. C 97, 069901(E) (2018)], which is investigated here. The Q-value dependence of the DPPs also contributes to a substantial difference between the optical model potential for protons and neutrons, there being substantially different Q values for 40Ca (n, d) and 40Ca (p, d) pickup reactions. The DPP calculations also enable a study of the dynamical nonlocality (distinct from exchange nonlocality) arising from pickup coupling. The characteristic properties of the DPPs for both protons and neutrons arising from nucleon pickup are also presented for incident nucleons at 25, 35, 40, and 45 MeV. All these properties vary with energy in a consistent way, including a change in the rms radius of the real potential, which, together with the general undularity of the DPP, shows that the pickup contributions cannot be represented by renormalizing a folding model potential.

Item Type: Journal Item
Copyright Holders: 2019 American Physical Society
ISSN: 2469-9993
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 59931
Depositing User: Raymond Mackintosh
Date Deposited: 26 Mar 2019 08:55
Last Modified: 30 Mar 2019 10:27
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