The shell model for T=0 and T=1 states in the middle of the sd shell

Spectroscopic properties of several hundreds of T=0 and T=1 states of A=28 and 30 nuclei have been compared with the results of a shell-model calculation (untruncated sd shell). For A=28 the calculation also includes γ-ray branching and mixing ratios, lifetimes, spectroscopic factors, proton widths and log ft values for the 28P(β+)28Si decay. Uncertainties in spin, parity and isospin determinations have been resolved and parent-analogue relations have been established. Errors have been spotted in the analysis and evaluation of experimental data. A clear indication has been found of intruder states in 28Si and 30P. The present work has provided a good idea as to the reliability of the shell model in the middle of the sd shell. With previous results for A=26 taken along one arrives at an average error of 145 keV in the theoretical energies. The averaged absolute spread in the ratio of theoretical over experimental strengths amounts to a factor 1.9 for isoscalar E2 transitions, and to a factor 2.3 for isovector M1 transitions. (orig.)