CLUSTER STRUCTURE IN CA-40 VIA THE ALPHA-TRANSFER REACTION

About seventy levels up to E(x) = 15 MeV in Ca-40 have been studied vi a the (Li-6, d) reaction at E = 50 MeV. The members of the K(pi) = 0- band of a counterpart to the first K(pi) = 0+ band in the parity doubl et bands were observed, in some fragments, from the 1- state at 8 MeV to the 7- state at 12.65 MeV in excitation energy. The J(pi) = 8+ stat e was found at 10.34 MeV, and the 6.93 MeV level was confirmed as a J( pi) = 6+ state. These states are considered as the members of the K(pi ) = 0+ band starting from the 0+ state at E(x) = 3.35 MeV. The 0+, 2+, 4+ and 6+ members of a higher nodal K(pi) = 0+ band with N = 14 were observed for the first time in the fp-shell nuclei. This band consists of the strongly populated states in an excitation energy region from the 0+ state at 11 MeV to the 6+ state at 15 MeV. The spectroscopic fa ctors suggested the much stronger alpha-cluster character.