| Autor: |
De Rydt, M., Neyens, G., 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., Stodel, C., Thomas, J. C., Ueno, H., Utsuno, Y., Vanderheijden, W., Vermeulen, ., Vingerhoets, P., Yoshimi, A. |
| Rok vydání: |
2009 |
| Předmět: |
|
| Zdroj: |
Phys.Lett.B678:344-349,2009 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1016/j.physletb.2009.06.043 |
| Popis: |
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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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