Mg26 nuclear structure from Mg26(200 MeV)+208Pb scattering

Differential cross sections are reported for elastic scattering and for exciting the 2(1)+ (1.81 MeV), 2(2)+ (2.94 MeV), 4(1)+ (4.32 MeV), and the 4(2)+ (4.90 MeV) states of Mg-26 from Mg-26 (200 MeV) + Pb-208 scattering. In addition, we have measured complete particle-gamma angular correlations for the 2(1)+ --> 0(1)+, 2(2)+ --> 2(1)+, and 4(2)+ --> 2(1)+ gamma-decays. Coupled-channels analysis was performed to extract E2 and E4 matrix elements. For the ground-state rotational band we find M(E2;0(1)+ <--> 2(1)+) = -16.79 +/- 0.13 e fm2, M(E4;0(1)+ <--> 4(2)+) = +95 +/- 10 e fm4, and Q2(2(1)+) = -20.9 +/- 1.9 e fm2, where we have identified the 4(2)+ (4.90 MeV) state as a member of the ground-state band rather than the 4(1)+ (4.32 MeV) state. The 2(2)+ (2.94 MeV) state is not well accounted for by the asymmetric-rotor model.