Ground-state electric quadrupole moment of 31Al
D. Nagae, H. Ueno, D. Kameda, M. Takemura, K. Asahi, K. Takase, A., Yoshimi, T. Sugimoto, K. Shimada, T. Nagatomo, M. Uchida, T. Arai, T. Inoue,, S. Kagami, N. Hatakeyama, H. Kawamura, K. Narita, J. Murata
TL;DR
This study measures the electric quadrupole moment of 31Al using beta-NMR spectroscopy, confirming its placement outside the island of inversion and supporting the sd shell model.
Contribution
First measurement of the ground-state electric quadrupole moment of 31Al using beta-NMR spectroscopy, providing evidence for its nuclear structure.
Findings
Measured |Q_exp(31Al)| = 112(32) eb
Results agree with sd shell model calculations
Supports 31Al being outside the island of inversion
Abstract
Ground-state electric quadrupole moment of 31Al (I =5/2+, T_1/2 = 644(25) ms) has been measured by means of the beta-NMR spectroscopy using a spin-polarized 31Al beam produced in the projectile fragmentation reaction. The obtained Q moment, |Q_exp(31Al)| = 112(32)emb, are in agreement with conventional shell model calculations within the sd valence space. Previous result on the magnetic moment also supports the validity of the sd model in this isotope, and thus it is concluded that 31Al is located outside of the island of inversion.
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