27Al(p,ν)28Si and 27Al(3He,d)28Si to the stretched 11.58-MeV (6-,0) and 14.36-MeV (6-,1) levels

We have studied the E/sub x/ = 14.36 MeV 6-,T = 1 resonance in the 27Al(p,ν) reaction with the result that GAMMA/sub Po/ = GAMMA = 4.0 +- 0.2 keV, from which we infer a (d/sub 5/2/-1,f/sub 7/2/) parentage delta12 approx. = 0.7. We also obtain B(M1) = 2.8 +- 0.4 nm2 or 0.19 +- 0.03 of the pure single particle (d/sub 5/2/-1,f/sub 7/2/) value for the 6-,1 → 6-,0 M1 ν-decay. 27Al (3He,d) results for stripping to the 6-,1 and the 6-,0 (11.58 MeV) levels indicate S/sub o/(p)/S1(p) = 1.1 +- 0.1 and hence that the 6-,0 level has a (d/sub 5/2/-1,f/sub 7/2/) parentage comparable to the 6-,1 level, contrary to inferences based on inelastic proton and pion scattering data. We discuss the hindrance of the M1 decay and the previously measured inelastic electron, proton and pion excitation strengths relative to the expectations of a 1 particle-1 hole model