Direct charge-exchange versus sequential nucleon transfers in the 14C( 6Li, 6He) 14N reaction at 93 MeV

Abstract

The 14C( 6Li, 6He) 14N reaction was investigated at a 6Li ion energy of 93 MeV. The angular distributions for several natural and unnatural parity states of the 14N nucleus were compared with the DWBA and Coupled Reaction Channels (CRC) calculations assuming direct charge exchange and two-step sequential nucleon transfers. It was shown that the direct charge-exchange mechanism dominates for the transitions to the ground and excited ( E x = 3.95 MeV) 1 4 states of the 14N nucleus up to angles of 50°–70°. The sequential nucleon transfers must be taken into account at larger angles for these states and in the full angular range for the other states (2.31 MeV (0 +, T = 1), 5.11 MeV (2 −), 5.69 MeV (1 −) + 5.83 MeV (3 −), 7.03 MeV (2 +) and 8.49 MeV (4 −)).