High-precision quadrupole moment reveals significant intruder component in 33Al20 ground state
Abstract
The electric quadrupole moment of the 33Al20 ground state, located at the border of the island of inversion, was obtained using continuous-beam beta-detected nuclear quadrupole resonance (beta-NQR). From the measured quadrupole coupling constant Q = 2.31(4) MHz in an alpha-Al2O3 crystal, a precise value for the electric quadrupole moment is extracted: Qs= 141(3) mb. A comparison with large-scale shell model calculations shows that 33Al has at least 50% intruder configurations in the ground state wave function, favoring the excitation of two neutrons across the N = 20 shell gap. 33Al therefore clearly marks the gradual transition north of the deformed Na and Mg nuclei towards the normal Z>14 isotopes.
Keywords
Cite
@article{arxiv.1608.04360,
title = {High-precision quadrupole moment reveals significant intruder component in 33Al20 ground state},
author = {H. Heylen and M. De Rydt and G. Neyens and M. L. Bissell and L. Caceres and R. Chevrier and J. M. Daugas and Y. Ichikawa and Y. Ishibashi and O. Kamalou and T. J. Mertzimekis and P. Morel and J. Papuga and A. Poves and M. M. Rajabali and C. Stodel and J. C. Thomas and H. Ueno and Y. Utsuno and N. Yoshida and A. Yoshimi},
journal= {arXiv preprint arXiv:1608.04360},
year = {2016}
}
Comments
6 pages, 4 figures. Accepted for publication in Physical Review C