TY - JOUR
T1 - Precision measurement of the electric quadrupole moment of 31Al and determination of the effective proton charge in the sd-shell
AU - De Rydt, M.
AU - Neyens, G.
AU - Asahi, K.
AU - Balabanski, D. L.
AU - Daugas, J. M.
AU - Depuydt, M.
AU - Gaudefroy, L.
AU - Grévy, S.
AU - Hasama, Y.
AU - Ichikawa, Y.
AU - Morel, P.
AU - Nagatomo, T.
AU - Otsuka, T.
AU - Perrot, L.
AU - Shimada, K.
AU - Stödel, C.
AU - Thomas, J. C.
AU - Ueno, H.
AU - Utsuno, Y.
AU - Vanderheijden, W.
AU - Vermeulen, N.
AU - Vingerhoets, P.
AU - Yoshimi, A.
N1 - Funding Information:
We are grateful to the GANIL staff for the technical support and to Dr. E. Yagi for the useful help and advice with the X-ray diffraction analysis of the α -Al 2 O 3 sample. This work has been financed by the European Community FP6 – Structuring the ERA – Integrated Infrastructure Initiative contract EURONS No. RII3-CT-2004-506065, by the FWO-Vlaanderen and by the IAP-programme of the Belgium Science Policy under grand number P6/23.
PY - 2009/7/27
Y1 - 2009/7/27
N2 - The electric quadrupole coupling constant of the 31Al ground state is measured to be νQ = | frac(e Q Vz z, h) | = 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 (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 ep = 1.1 e provides a much better description of the nuclear properties in the sd-shell than the adopted value ep = 1.3 e.
AB - The electric quadrupole coupling constant of the 31Al ground state is measured to be νQ = | frac(e Q Vz z, h) | = 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 (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 ep = 1.1 e provides a much better description of the nuclear properties in the sd-shell than the adopted value ep = 1.3 e.
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U2 - 10.1016/j.physletb.2009.06.043
DO - 10.1016/j.physletb.2009.06.043
M3 - Article
AN - SCOPUS:67649934760
SN - 0370-2693
VL - 678
SP - 344
EP - 349
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 4
ER -