Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10723988 | Physics Letters B | 2009 | 6 Pages |
Abstract
The electric quadrupole coupling constant of the 31Al ground state is measured to be νQ=|eQVzzh|=2196(21)kHz using two different β-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(Al31)|=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(Al31)| 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 ep=1.1e provides a much better description of the nuclear properties in the sd-shell than the adopted value ep=1.3e.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
M. De Rydt, G. Neyens, K. Asahi, D.L. Balabanski, J.M. Daugas, M. Depuydt, L. Gaudefroy, S. Grévy, Y. Hasama, Y. Ichikawa, P. Morel, T. Nagatomo, T. Otsuka, L. Perrot, K. Shimada, C. Stödel, J.C. Thomas, H. Ueno, A. Yoshimi,