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Title: Precision measurement of the electric quadrupole moment of Al-31 and determination of the effective proton charge in the sd-shell
Authors: De Rydt, Marieke ×
Neyens, Gerda
Asahi, K
Balabanski, D. L
Daugas, J. M
Depuydt, M
Gaudefroy, L
Grevy, S
Hasama, Y
Ichikawa, Y
Morel, P
Nagatomo, T
Otsuka, T
Perrot, L
Shimada, K
Stoedel, C
Thomas, J. C
Ueno, H
Utsuno, Y
Vanderheijden, W
Vermeulen, Nele
Vingerhoets, Pieter
Yoshimi, A #
Issue Date: Jul-2009
Publisher: Elsevier science bv
Series Title: Physics letters b vol:678 issue:4 pages:344-349
Abstract: The electric quadrupole coupling constant of the Al-31 ground state is measured to be nu(Q) = vertical bar eQV(zz)/h vertical bar = 2196(21) kHz using two different beta-NMR (Nuclear Magnetic Resonance) techniques. For the first time, a direct comparison is made between the continuous If 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 Al-31 has been deduced: vertical bar Q(Al-31)vertical bar = 134.0(16) mb. Comparison of this value with large-scale shell-model calculations in the sd and sdpf valence spaces Suggests that the Al-31 ground state is dominated by normal sd-shell configurations with a possible small contribution of intruder states. The obtained value for vertical bar Q(Al-31)vertical bar 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) = 1.1e provides a much better description of the nuclear properties in the sd-shell than the adopted value e(p) = 1.3e. (C) 2009 Elsevier B.V. All rights reserved.
URI: 
ISSN: 0370-2693
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
Tutorial services, Faculty of Engineering
× corresponding author
# (joint) last author

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