Triaxial shapes for sd-shell nuclei

The E2 properties and excitation energies of low-lying states in ²⁴Mg, ²⁶Mg, ³⁰Si, and ³²S are calculated using the adiabatic model of a triaxially deformed rotor. The results are compared with those of recent shell-model calculations and strong similarity is found for both ²⁴Mg and ³²S with nearly the same deformation parameters in the adiabatic model. The strength for isovector M1 excitation, pertinent to results of inelastic electron scattering, is also calculated using the closure sum rule.