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The electric quadrupole moment of the 33Al20 ground state, located at theborder of the island of inversion, was obtained using continuous-beambeta-detected nuclear quadrupole resonance (beta-NQR). From the measuredquadrupole coupling constant Q = 2.31(4) MHz in an alpha-Al2O3 crystal, aprecise value for the electric quadrupole moment is extracted: Qs= 141(3) mb. Acomparison with large-scale shell model calculations shows that 33Al has atleast 50% intruder configurations in the ground state wave function, favoringthe excitation of two neutrons across the N = 20 shell gap. 33Al thereforeclearly marks the gradual transition north of the deformed Na and Mg nucleitowards the normal Z>14 isotopes.

High-precision quadrupole moment reveals significant intruder component in 33Al20 ground state