Microscopic analysis of the (6Li,6He) reaction

The spin-isospin flip (6Li,6He) reaction was studied both experimentally and theoretically. The experiment was performed using 34 MeV 6Li+++ beam from the FN tandem Van de Graaff incident upon 23Na, 25Mg, 26Mg, 27Al, 54Fe and 58Ni targets. The experimental data was obtained by using the standard ΔE . E silicon detector techniques of mass separation. Optical model parameters were determined from elastic scattering on the Mg and Al targets. Annular distributions associated with the lowest 5/2+, 1/2+, 7/2+ 25Al, 5+, 3+, 1+ 26Al, 5/2+ 27Si and 7+, 1+ 54Co states were measured. The DWBA microscopic calculations were performed using Yukawa (μ = 0.707 and 1.0 fm-1) and r2 . Y tensor (μ = 1.0 fm-1) potentials integrated over the projectile cluster model wave functions. Knock-on exchange effects for the central interaction were included in an approximate way following a technique developed earlier to study the inelastic and charge exchange interactions of projectiles with A less than or equal to 4. The nuclear states were described by (ld5/2)-2 and (lf7/2)-2 shell model configurations for the mass A = 26 and 54 nuclei, respectively, one-particle Nilsson model configurations for the mass A = 25 nuclei and both one-hole Nilsson model and sd-shell model configurations for the mass A = 27 nuclei. The theoretical analysis of the data associated with 26Mg showed reasonable agreement using the Yukawa potential with a range of 1.0 fm-1. The result of including exchange effects was mainly to normalize the calculated cross sections, giving V11 strengths between 15.2 MeV and 18 MeV. The tensor potential with a strength V/sub T/ = 2.2 MeV gave a negligible contribution to the calculated cross sections. The V11 strengths were in this case between 15.1 MeV and 16.4 MeV