This study investigated the elastic and inelastic scattering of^(3)He particles from^(12)C,^(16)O,^(24)Mg,and^(28)Si nuclei at 60 MeV using a double-folding approach with four newly derived effective nucleon-nucleon(N...This study investigated the elastic and inelastic scattering of^(3)He particles from^(12)C,^(16)O,^(24)Mg,and^(28)Si nuclei at 60 MeV using a double-folding approach with four newly derived effective nucleon-nucleon(NN)interactions(R3Y(HS),R3Y(L1),R3Y(W),and R3Y(Z))derived from the relativistic mean-field theory.The four derived effective NN interactions exhibited strong sensitivity to the choice of exchange potential.Regularizing the NN interactions improved the agreement between calculated folded potentials and experimental data.Normalization constants for the R3Y(HS)interaction suggested its superiority over the R3Y(L1)and R3Y(W)interactions within the double-folding framework.Transition potentials based on two models,deformed potential and double folding potential,were used to describe inelastic scattering.Physically consistent deformation parameters were obtained.The deformed potential model yielded better results for^(12)C and^(16)O,whereas the double folding model performed better for^(24)Mg and^(28)Si,suggesting that the advantage of the double folding model is limited to lighter targets.The Bohr-Mottelson transition density effectively described 2^(+)states;however,it was less suitable for the 3-state of^(16)O,for which a Tassie-like transition density provided improved agreement.展开更多
Relativistic microscopic optical potentials(RMOPs)were constructed for nucleon-nucleus scattering within the framework of relativistic impulse approximation(RIA).Nuclear matter densities were calculated using relativi...Relativistic microscopic optical potentials(RMOPs)were constructed for nucleon-nucleus scattering within the framework of relativistic impulse approximation(RIA).Nuclear matter densities were calculated using relativistic mean-field(RMF)theory,employing both the density-dependent meson-exchange(DD-ME2)and point-coupling(DD-PC1)parameterizations.The resulting RMOP comprised real and imaginary scalar and vector components.Its efficacy was evaluated through a systematic analysis of elastic proton scattering from seven nuclei(^(12)C,^(16)O,^(28)Si,^(40)Ca,^(58)Ni,^(90)Zr,and ^(208)Pb)and calcium isotopes(^(42,44,48)Ca)at incident energies of 200–800 MeV using the Dirac optical model.The RMF-derived densities showed good agreement with experimental root-mean-square radii,neutron skin thicknesses,and binding energies.Differences between the two parameterizations were minimal and diminished for heavier nuclei.The folded potentials displayed characteristic energy-dependent behavior:the real part transitioned from attractive to repulsive,whereas the imaginary absorption strengthened with increasing energy.The differential cross sections calculated using RMOPs showed strong agreement with experimental data.For calcium isotopes,the calculated isotopic trends in neutron skins and densities yielded excellent agreement with cross-section data at 800 MeV.However,the analyzing powers for the neutron-rich ^(48)Ca exhibited some discrepancies.Furthermore,eikonal approximation was employed to compute differential cross sections.This approach incorporated effective central and spin-orbit terms derived from the RMF-based RMOP,providing strong validation of the potential and highlighting the significance of the spin-orbit contribution.It also successfully extended the application of the RMOP to eikonal formalism.展开更多
文摘This study investigated the elastic and inelastic scattering of^(3)He particles from^(12)C,^(16)O,^(24)Mg,and^(28)Si nuclei at 60 MeV using a double-folding approach with four newly derived effective nucleon-nucleon(NN)interactions(R3Y(HS),R3Y(L1),R3Y(W),and R3Y(Z))derived from the relativistic mean-field theory.The four derived effective NN interactions exhibited strong sensitivity to the choice of exchange potential.Regularizing the NN interactions improved the agreement between calculated folded potentials and experimental data.Normalization constants for the R3Y(HS)interaction suggested its superiority over the R3Y(L1)and R3Y(W)interactions within the double-folding framework.Transition potentials based on two models,deformed potential and double folding potential,were used to describe inelastic scattering.Physically consistent deformation parameters were obtained.The deformed potential model yielded better results for^(12)C and^(16)O,whereas the double folding model performed better for^(24)Mg and^(28)Si,suggesting that the advantage of the double folding model is limited to lighter targets.The Bohr-Mottelson transition density effectively described 2^(+)states;however,it was less suitable for the 3-state of^(16)O,for which a Tassie-like transition density provided improved agreement.
文摘Relativistic microscopic optical potentials(RMOPs)were constructed for nucleon-nucleus scattering within the framework of relativistic impulse approximation(RIA).Nuclear matter densities were calculated using relativistic mean-field(RMF)theory,employing both the density-dependent meson-exchange(DD-ME2)and point-coupling(DD-PC1)parameterizations.The resulting RMOP comprised real and imaginary scalar and vector components.Its efficacy was evaluated through a systematic analysis of elastic proton scattering from seven nuclei(^(12)C,^(16)O,^(28)Si,^(40)Ca,^(58)Ni,^(90)Zr,and ^(208)Pb)and calcium isotopes(^(42,44,48)Ca)at incident energies of 200–800 MeV using the Dirac optical model.The RMF-derived densities showed good agreement with experimental root-mean-square radii,neutron skin thicknesses,and binding energies.Differences between the two parameterizations were minimal and diminished for heavier nuclei.The folded potentials displayed characteristic energy-dependent behavior:the real part transitioned from attractive to repulsive,whereas the imaginary absorption strengthened with increasing energy.The differential cross sections calculated using RMOPs showed strong agreement with experimental data.For calcium isotopes,the calculated isotopic trends in neutron skins and densities yielded excellent agreement with cross-section data at 800 MeV.However,the analyzing powers for the neutron-rich ^(48)Ca exhibited some discrepancies.Furthermore,eikonal approximation was employed to compute differential cross sections.This approach incorporated effective central and spin-orbit terms derived from the RMF-based RMOP,providing strong validation of the potential and highlighting the significance of the spin-orbit contribution.It also successfully extended the application of the RMOP to eikonal formalism.
