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

A number of 6− and 5− states in 26Al were studied in the region of excitation energy 5–15 MeV with the 24Mg(α, d)26Al reaction at Eα = 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 25Mg(3He, d)26Al 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-3He-d) and (α-t-d).