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

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, Y. Utsuno, W. VanderheijdenN. Vermeulen, P. Vingerhoets, A. Yoshimi

研究成果: Contribution to journalArticle査読

13 被引用数 (Scopus)


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.

ジャーナルPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
出版ステータス出版済み - 7 27 2009

All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学


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