Population of 6− and 5− states in 26Al by the (α, d) reaction

A number of 6 − and 5 − states in 26 Al were studied in the region of excitation energy 5–15 MeV with the 24 Mg(α, d) 26 Al reaction at E α = 63.7 MeV. The data were analyzed within the framework of zero-range DWBA theory for a macroscopic deuteron-cluster transfer as well as for a microscopic two-nucleon transfer, and compared with our previous results on the 25 Mg( 3 He, d) 26 Al reaction. Several 6 − and 5 − states are newly proposed. Five 6 − states previously assigned as T = 1 were weakly observed in the present (α, d) reaction, which should excite only T = 0 states. The isospin breaking (α, d) transition to the 6 − 1 , T = 1 state was found to be an order of magnitude larger than a second-order exact-finite-range DWBA calculation for the successive transfer processes of ( α - 3 He-d) and ( α -t-d).