Calculation of the 6He + p elastic scattering cross sections within the folding approach and the high-energy approximation for the optical potential (original) (raw)
Related papers
2007
Calculations of microscopic optical potentials (OP's) (their real and imaginary parts) are performed to analyze the 6 He+p elastic scattering data at a few tens of MeV/nucleon (MeV/N). The OP's and the cross sections are calculated using three model densities of 6 He. Effects of the regularization of the NN forces and their dependence on nuclear density are investigated. Also, the role of the spin-orbit terms and of the non-linearity in the calculations of the OP's, as well as effects of their renormalization are studied. The sensitivity of the cross sections to the nuclear densities was tested and one of them that gives a better agreement with the data was chosen. PACS. 24.10.Ht Optical and diffraction models -25.60.-t Reactions induced by unstable nuclei -21.30.-x Nuclear forces -21.10.Gv Mass and neutron distributions
Folding model calculations for 6 He+ 12 C elastic scattering
Chinese Physics C, 2016
In the framework of the double folding model, we used the α+2n and di-triton configurations for the nuclear matter density of the 6 He nucleus to generate the real part of the optical potential for the system 6 He+ 12 C. As an alternative, we also use the high energy approximation to generate the optical potential for the same system. The derived potentials are employed to analyze the elastic scattering differential cross section at energies of 38.3, 41.6 and 82.3 MeV/nucleon. For the imaginary part of the potential we adopt the squared Woods-Saxon form. The obtained results are compared with the corresponding measured data as well as with available results in literature. The calculated total reaction cross sections are investigated and compared with the optical limit Glauber model description.
Full-folding optical potentials for elastic nucleon-nucleus scattering based on realistic densities
Physical Review C, 1997
Optical model potentials for elastic nucleon nucleus scattering are calculated for a number of target nuclides from a full-folding integral of two different realistic target density matrices together with full off-shell nucleonnucleon t-matrices derived from two different Bonn meson exchange models. Elastic proton and neutron scattering observables calculated from these full-folding optical potentials are compared to those obtained from 'optimum factorized' approximations in the energy regime between 65 and 400 MeV projectile energy. The optimum factorized form is found to provide a good approximation to elastic scattering observables obtained from the full-folding optical potentials, although the potentials differ somewhat in the structure of their nonlocality.
Calculations of ^{8}He+p elastic cross sections using a microscopic optical potential
Physical Review C, 2009
An approach to calculate microscopic optical potential (OP) with the real part obtained by a folding procedure and with the imaginary part inherent in the high-energy approximation (HEA) is applied to study the 8 He+p elastic scattering data at energies of tens of MeV/nucleon (MeV/N). The neutron and proton density distributions obtained in different models for 8 He are utilized in the calculations of the differential cross sections. The role of the spin-orbit potential is studied. Comparison of the calculations with the available experimental data on the elastic scattering differential cross sections at beam energies of 15.7, 26.25, 32, 66 and 73 MeV/N is performed. The problem of the ambiguities of the depths of each component of the optical potential is considered by means of the imposed physical criterion related to the known behavior of the volume integrals as functions of the incident energy. It is shown also that the role of the surface absorption is rather important, in particular for the lowest incident energies (e.g., 15.7 and 26.25 MeV/nucleon).
Comparison of nucleon-nucleon potential models in a full-folding description of elastic scattering
Physical Review C, 1991
The sensitivity of proton-nucleus elastic scattering to different nucleon-nucleon effective interactions is studied within the framework of the nonrelativistic full-folding model. Calculations of the nucleon-nucleus optical potential are made using the free nucleon-nucleon t-matrices generated from the Bonn, Paris, Hamada-Johnston, and Melbourne nucleon-nucleon potentials, whose full off-shell behavior is treated explicitly. Applications are made to p + Ca elastic scattering at energies of 200, 300, and 400 MeV within the full-folding framework. Calculations using the on-shell tp
The vector analyzing power and differential cross section for the elastic scattering of 6 He nucleus from polarized protons at 71 MeV/nucleon have been analyzed using the optical model potentials. Different versions of the nuclear potential are constructed using phenomenological potentials and semimicroscopic potentials based upon four different versions of 6 He density and three effective nucleon-nucleon interactions. The effects of density dependence and the sensitivity of the cross sections for interactions have been investigated.
^{6}He+^{12}C elastic scattering using a microscopic optical potential
Physical Review C, 2010
The 6 He+ 12 C elastic scattering data at beam energies of 3, 38.3 and 41.6 MeV/nucleon are studied utilizing the microscopic optical potentials obtained by a double-folding procedure and also by using those inherent in the high-energy approximation. The calculated optical potentials are based on the neutron and proton density distributions of colliding nuclei established in an appropriate model for 6 He and obtained from the electron scattering form factors for 12 C. The depths of the real and imaginary parts of the microscopic optical potentials are considered as fitting parameters. At low energy the volume optical potentials reproduce sufficiently well the experimental data. At higher energies, generally, additional surface terms having form of a derivative of the imaginary part of the microscopic optical potential are needed. The problem of ambiguity of adjusted optical potentials is resolved requiring the respective volume integrals to obey the determined dependence on the collision energy. Estimations of the Pauli blocking effects on the optical potentials and cross sections are also given and discussed. Conclusions on the role of the aforesaid effects and on the mechanism of the considered processes are made.
Nuclear Physics A, 2000
A generalized double-folding model for elastic and inelastic nucleus-nucleus scattering is Ž. presented. It is designed to accommodate effective nucleon-nucleon NN interactions that depend upon the density of nuclear matter in which the two nucleons are immersed. A recently parametrized density dependent M3Y interaction, based on the G-matrix elements of the Paris NN potential, has been used in the present folding calculation. The effects of knock-on exchange of the interacting nucleon pair are included in an accurate local approximation. Examples of the application of this model to study the refractive elastic and inelastic scattering data of 12 C q 12 C and a q 58,60 Ni systems are presented. A detailed comparison of the use of deformed optical Ž. potential DP and microscopic folded potential in the analysis of inelastic scattering has shown that the use of DP fails to reproduce the inelastic 12 C q 12 C scattering data measured over a wide angular range, which covers both the diffractive and refractive regions. The use of the DP model also significantly underestimates the nuclear deformation lengths of the quadrupole and octupole excitations under study.
Ядерная физика, 2014
The vector analyzing power and differential cross section for the elastic scattering of 6 He nucleus from polarized protons at 71 MeV/nucleon have been analyzed using the optical model potentials. Different versions of the nuclear potential are constructed using phenomenological potentials and semimicroscopic potentials based upon four different versions of 6 He density and three effective nucleon-nucleon interactions. The effects of density dependence and the sensitivity of the cross sections for interactions have been investigated.
Elastic Scattering of 6 He + p at 82.3 MeV/nucleon
Chinese Physics Letters, 2010
Differential cross sections for the elastic scattering of halo nucleus 6 He on proton target were measured at 82.3 MeV/. The experimental results are well reproduced by optical model calculations using global potential KD02 with a reduction of the depth of real volume part by a factor of 0.7. A systematic analysis shows that this behavior might be related to the weakly bound property of unstable nuclei.