English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The coupled-channel technique augments a non-relativistic distorted wave bornapproximation scattering calculation to include a coupling to virtual statesfrom the negative energy region. It has been found to be important in lowenergy nucleon-nucleus scattering. We modify the nucleon-nucleus standardoptical potentials, not designed for a coupled-channel space, so they can beused in that setting. The changes are small and systematic. We use a standardscattering code to adjust a variety of optical potentials and targets such thatthe original fit to scattering observables are maintained as we incorporate thecoupled-channel environment. Overall over forty target nuclei were tested from$A=12$ to $A=205$ and nucleon projectile energies from 1 MeV to 200 MeV. Thereis excellent improvement in fitting the scattering observables, especially forlow energy neutron scattering.The corrections were found to be unimportant forprojectile energies greater than 200 MeV. The largest changes are to thesurface amplitudes while the real radii and the real central amplitude aremodified by only a few percent, every other parameter is unchanged. Thistechnique is general enough to be applied to a variety of inelastic theoreticalcalculations.

Adding Corrections to Global Spherical Potentials for Use in a Coupled-Channel Formulation