Dirac Coupled Channel Analyses of the high-lying excited states at $^{22}$Ne(p,p$'$)$^{22}$Ne

TL;DR

This study uses relativistic Dirac coupled channel analysis with optical potentials to effectively describe high-lying vibrational excited states in $^{22}$Ne, outperforming nonrelativistic models in accuracy.

Contribution

It introduces a relativistic Dirac coupled channel approach with vibrational collective models for high-lying states in $^{22}$Ne, showing improved description over nonrelativistic methods.

Findings

Relativistic calculations better fit high-lying vibrational states.

Channel-coupling effects are significant for these states.

Deformation parameters agree with nonrelativistic results.

Abstract

Dirac phenomenological coupled channel analyses are performed using an optical potential model for the high-lying excited vibrational states at 800 MeV unpolarized proton inelastic scatterings from $^{22}$Ne nucleus. Lorentz-covariant scalar and time-like vector potentials are used as direct optical potentials and the first-order vibrational collective model is used for the transition optical potentials to describe the high-lying excited vibrational collective states. The complicated Dirac coupled channel equations are solved phenomenologically using a sequential iteration method by varying the optical potential and the deformation parameters. Relativistic Dirac coupled channel calculations are able to describe the high-lying excited states of the vibrational bands in $^{22}$Ne clearly better than the nonrelativistic coupled channel calculations. The channel-coupling effects of the multistep process for the excited states of the vibrational bands are investigated. The deformation parameters obtained from the Dirac phenomenological calculations for the high-lying vibrational excited states in $^{22}$Ne are found to agree well with those obtained from the nonrelativistic calculations using the same Woods-Saxon potential shape.