Calculation of a complete set of spin observables for proton elastic scattering from stable and unstable nuclei

A microscopic study of proton elastic scattering from unstable nuclei at intermediate energies using a relativistic formalism is presented. We have employed both the original relativistic impulse approximation (IA1) and the generalised impulse approximation (IA2) formalisms to calculate the relativistic optical potentials, with target densities derived from relativistic mean field (RMF) theory using the NL3 and FSUGold parameter sets. Comparisons between the optical potentials computed using both IA1 and IA2 formalisms, and the different RMF Lagrangians are presented for both stable and unstable targets. The comparisons are required to study the effect of using IA1 versus IA2 optical potentials, with different RMF parameter sets, on elastic scattering observables for unstable targets at intermediate energies. We also study the effect of full-folding versus the factorized form of the optical potentials on elastic scattering observables. As with the case for stable nuclei, we found that the use of the full-folding optical potential improves the scattering observables (especially spin observables) at low intermediate energy (e.g. 200MeV). No discernible difference is found at a projectile incident energy of 500 MeV. To check the validity of using localized optical potential, we calculate the scattering observables using non-local potentials by solving the momentum space Dirac equation. The Dirac equation is transformed to two coupled Lippmann-Schwinger equations, which are then numerically solved to obtain elastic scattering observables. The results are discussed and compared to calculations involving local coordinate-space optical potentials

Comparison of double-folding effective interactions within the cluster model

CITATION: Kaya, B. D. C. K., et al. 2018. Comparison of double-folding effective interactions within the cluster model. Physical Review C, 98(4):044308, doi:10.1103/PhysRevC.98.044308.The original publication is available at https://journals.aps.org/prcCluster-core hybrid potentials with Woods-Saxon plus cubic terms have been constructed to account for both the decay properties and positive-parity ground-state bands in 212Po, 218Rn, 222Ra, and 228Th. The hybrid potential parameters have been extracted from the real part of the double-folding interaction using the realistic Michigan- 3-Yukawa (M3Y) and a complex Gaussian effective interactions. We find that both the effective interactions exhibit similar behavior in the internal region, and the agreement between our estimated results with the existing experimental data is satisfactory.https://journals.aps.org/prc/abstract/10.1103/PhysRevC.98.044308Publisher's versio