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

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

2009-06-23

arxiv.org/abs/0906.4272v1

Phys.Lett.B678:344-349,2009

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

10.1016/j.physletb.2009.06.043

he electric quadrupole coupling constant of the 31Al ground state is measured to be nu_Q = |eQV_{zz}/h| = 2196(21)kHz using two different beta-NMR (Nuclear Magnetic Resonance) techniques. For the first time, a direct comparison is made between the continuous rf technique and the adiabatic fast passage method. The obtained coupling constants of both methods are in excellent agreement with each other and a precise value for the quadrupole moment of 31Al has been deduced: |Q(31Al)| = 134.0(16) mb. Comparison of this value with large-scale shell-model calculations in the sd and sdpf valence spaces suggests that the 31Al ground state is dominated by normal sd-shell configurations with a possible small contribution of intruder states. The obtained value for |Q(31Al)| and a compilation of measured quadrupole moments of odd-Z even-N isotopes in comparison with shell-model calculations shows that the proton effective charge e_p=1.1 e provides a much better description of the nuclear properties in the sd-shell than the adopted value e_p=1.3 e.

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