16 research outputs found
Analysis of the dependence parametrization of the allocations of heavy ions on light nuclei elastic scattering diffraction maxima from the projectile energy
Diffraction range of available experimental differential cross sections of heavy ions on light nuclei elastic scattering for 17 pairs of the interacting nuclei with 4 ≤ А ≤ 20 have been analyzed in the projectile energy wide interval from 1 to 100 МеV/nucleon. Diffraction maxima and minima positions in the transferred momentum coordinates depending on projectile energy demonstrate smooth behavior at energies higher 2 - 4 МeV/nucleon, and practically do not depend on energy at energies up to 30 - 40 МеV/nucleon. These energy dependences of maxima (minima) positions can be parameterized by simple functions. It was found the suitable approximations that describe reasonably the energy dependence of the maxima (minima) positions of the experimental elastic scattering differential cross sections. These approximations were evaluated with the same parameters for all colliding nuclei groups
Energy dependence of the 6Li + 16O scattering and isotopic differences between potentials of the 6,7Li + 16O interactions
Experimental data of the 6Li + 16O elastic scattering at Ec.m.. = 3.27 - 36.8 MeV known from literature, were analyzed within the optical model and coupled-reaction-channels method. The 6Li + 16O elastic and inelastic scattering as well as the reorientation of 6Li and simplest transfer reactions were included in the coupled-channels-scheme. The 6Li + 16O potential parameters at different energies as well as their energy dependence were deduced accoounting dispersion relation between real and imaginary parts of the potential. Contributions of the 6 Li reorientation and transfer reactions to the 6Li + 16O elastic scattering data were estimated at different energies. Real part of the 6Li + 16O deduced
potential and the 6Li + 16O folding-potential are compared. The isotopic differences between the 6Li + 16O and 7Li + 16O
were studied
Energy dependence of the
Existing data for the 6Li + 16O elastic scattering at -36.8MeV were analyzed within the optical model and coupled-reaction-channels method. The 6Li + 16O elastic and inelastic scattering as well as the reorientation of 6Li and the simplest transfer reactions were included in the coupled-channels scheme. The 6Li + 16O potential parameters at different energies as well as their energy dependence were deduced by the use of the dispersion relation between the real and imaginary parts of the potential. The contributions of the 6Li reorientation and transfer reactions to the 6Li + 16O elastic scattering channel were estimated at the different energies. It is found that the potential scattering dominates the interaction at smaller angles for all energies, with the transfers contributing significantly at larger angles at the highest energies studied. The real part of the 6Li + 16O deduced potential is in reasonable agreement with that of a corresponding folding potential. The isotopic difference between the 6Li + 16O and 7Li + 16O optical potentials is larger for the imaginary potentials
The 6Li(18O, 17O)7Li reaction mechanisms and 7Li + 17O potential
Angular distributions of the 6Li(18O, 17O)7Li reaction were measured at Elab(18O) = 114 MeV for ground and excited states of exit nuclei. The data were analyzed within the coupled-reaction-channels method (CRC). The 6Li + 18O elastic and inelastic scattering channels as well as the simplest one- and two-step reactions were includ-ed in the coupled-reaction-channels scheme. In CRC calculations, the 6Li + 18O potential with parameters de-duced from the elastic scattering data, was used for the entrance reaction channel. The spectroscopic amplitudes of nucleons and clusters were calculated within the translational-invariant shell model. The 7Li + 17O potential parameters were deduced by fitting 6Li(18O, 17O)7Li reaction data. Isotopic differences of the 7Li + 17O, 7Li + 18O and 7Li + 16O potential, as well as the reaction mechanisms are studied
7Li(18O, 17O)7Li reaction and the 17N + 8Be-potential
The new data of the angular distributions of 7Li(18O, 16N)9Be reaction were obtained for the transitions to the ground and excited states of 8Be and 17N at the energy Elab(18O) = 114 MeV. The angular distributions of the reaction were measured for the first time. Data were analyzed with coupled-reaction-channels method for one- and two-step transfers of nucleons and clusters. In the analysis, the 7Li + 18O potential deduced in the analysis of the elastic 7Li + 18Oscattering data as well as shell-model spectroscopic amplitudes of transferred nucleons and clusters were used. The parameters of the 9Be + 16N potential were deduced using the reaction data. The contributions of different one- and twostep transfers in the 7Li(18O, 16N)9Be reaction cross-section was studied
Mechanism of the
Angular distributions of the 12C( 11B, 15N) 8Be reaction were measured at the energy E
lab(11
B) = 49 MeV for the transitions to the ground and 2.94 MeV (2+) excited state of 8Be and to the ground and 5.270 MeV (5/2+) + 5.299 MeV (1/2+), 6.324 MeV (3/2-), 7.155 MeV (5/2+) + 7.301 MeV (3/2+), 7.567 MeV (7/2+) excited states of 15N. The data were analyzed by the coupled-reaction-channel method. The elastic, inelastic scattering and one- and two-step transfers were included in the coupling scheme. The data of the 12C( 11B, 8Be) 15N reaction at E
cm = 9.4-17.8 MeV known from the literature, were also included in the analysis. The mechanism of the 12C( 11B, 15N) 8Be reaction and the optical-model potential parameters for the 15N + 8Be channel were deduced. The energy dependence of the optical-model parameters for the 15N + 8Be channel was obtained
Mechanism of 7Li(10B, 9Be)8Be, 10B(7Li, 9Be)8Be reactions and 8Be + 9Be-potential
Angular distributions of the 7Li(10B, 9Bе)8Bе were measured at the energy Elab(10B) = 51 MeV (21 MeV c.m.) for the ground and excited states of 8Bе. The experimental data were analyzed within the coupled-reaction-channels (CRC) method for one- and two-step transfers of nucleons and clusters. The 10B(7Li, 9Bе)8Bе reaction data at the energy Elab(7Li) = 24 MeV (14,12 MeV c.m.) known from the literature, were included in the CRC-analysis also. Mechanism of the reactions was determined, the parameters of the 8Bе + 9Bе-potential were deduced and energy dependence of the parameter was studied
Elastic and inelastic scattering of 18O ions by 6Li at 114 MeV and isotopic differences of 6, 7Li + 18O and 6Li + 16, 18O nuclei interactions
Angular distributions of the 6Li + 18O elastic and inelastic scattering as well as the 6Li(18O, Х) reactions with production of 16,17,19O + 8,7,5Li, 14,15,16,17N + 10,9,8,7Be and 12,13,14C + 12,11,10B nuclei were measured at Elab(18O) = = 114 MeV. The data were analyzed within the optical model and coupled-reaction-channels method. The 6Li + 18O optical potential parameters as well as deformation parameters of these nuclei were deduced and the scatter-ing mechanisms were studied. The isotopic differences between the 6, 7Li + 18O and 6Li + 16, 18O scattering as well as their potential parameters were investigated
Elastic and inelastic scattering of 12C ions by 7Li at 115 MeV
Angular distributions of the 7Li + 12C elastic and inelastic scattering as well as the 7Li(14N, Х) reactions with exited stable and unstable nuclei with Z = 3 6 were measured at Elab(12C) = 115 MeV. The data were analyzed within the optical model and coupled-reaction-channels method. The elastic and inelastic scattering, reorienta-tions of 7Li in ground and excited states as well as more important transfer reactions were included in the chan-nels-coupling-scheme. 7Li + + 12C optical potential parameters for ground and excited states of 7Li and 12C as well as deformation parameters of these nuclei were deduced. The contributions of one- and two-step transfers in the 7Li + 12C elastic and inelastic scattering channels were estimated
Mechanism of charge-exchange in the 7Li(10B, 10Be)7Be reaction and potential of interaction of the 7Be + 10Be nuclei
Angular distributions of the 7Li(10B, 10Bе)7Bе reaction were measured at the energy Elab(10B) = 51 MeV for the transitions
to the ground and excited states of 10Bе and 7Bе nuclei. The measured 7Li(10B, 10Bе)7Bе reaction data as well as only known from the literature 10B(7Li, 7Bе)10Bе reaction data at the energy Elab(7Li) = 39 MeV were analyzed within DWBA method for the direct charge-exchange of the 10B → 10Bе, 7Li → 7Bе nuclei and within the coupled-reactionchannels method for one- and two-step transfers of nucleons and clusters such as 10B → Х → 10Bе, 7Li → Y → 7Bе. It was studied the contributions of different mechanisms to the angular distribution of the 7Li(10B, 10Bе)7Bе and 10B(7Li, 7Bе)10Bе reactions. Using data of these reactions, the parameters of the 7Bе + 10Bе-potential as well as their
energy dependence were deduced by standard fitting procedure. The deduced 7Bе + 10Bе-potential is compared with the
corresponding folding-potential calculated using nucleon distributions in 7Bе and 10Bе