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he electric quadrupole coupling constant of the 31Al ground state is measuredto be nu_Q = |eQV_{zz}/h| = 2196(21)kHz using two different beta-NMR (NuclearMagnetic Resonance) techniques. For the first time, a direct comparison is madebetween the continuous rf technique and the adiabatic fast passage method. Theobtained coupling constants of both methods are in excellent agreement witheach other and a precise value for the quadrupole moment of 31Al has beendeduced: |Q(31Al)| = 134.0(16) mb. Comparison of this value with large-scaleshell-model calculations in the sd and sdpf valence spaces suggests that the31Al ground state is dominated by normal sd-shell configurations with apossible small contribution of intruder states. The obtained value for|Q(31Al)| and a compilation of measured quadrupole moments of odd-Z even-Nisotopes in comparison with shell-model calculations shows that the protoneffective charge e_p=1.1 e provides a much better description of the nuclearproperties in the sd-shell than the adopted value e_p=1.3 e.

Precision measurement of the electric quadrupole moment of 31Al and determination of the effective proton charge in the sd-shell