Nuclear ground-state spins and magnetic moments of 27Mg, 29Mg, and 31Mg

被引：53

作者：

Kowalska, M. ^{[1
]}

Yordanov, D. T. ^{[2
]}

Blaum, K. ^{[1
,3
]}

Himpe, P. ^{[2
]}

Lievens, P. ^{[4
]}

Mallion, S. ^{[2
]}

Neugart, R. ^{[1
]}

Neyens, G. ^{[2
]}

Vermeulen, N. ^{[2
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany

[2] Katholieke Univ Leuven, Inst Kern & Stralingsfys, B-3001 Louvain, Belgium

[3] GSI Darmstadt, D-64291 Darmstadt, Germany

[4] Katholieke Univ Leuven, Vaste Stof Fys & Magnetisme Lab, B-3001 Louvain, Belgium

来源：

PHYSICAL REVIEW C | 2008年 / 77卷 / 03期

关键词：

D O I：

10.1103/PhysRevC.77.034307

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The ground-state spins and magnetic moments of neutron-rich Mg-27, Mg-29, and Mg-31 were measured for the first time with laser and beta-NMR spectroscopy at ISOLDE/CERN. The hyperfine structure of Mg-27 observed in fluorescence-confirms previous assignments of the spin I = 1/2 and reveals the magnetic moment mu(I) (Mg-27) = -0.4107(15) mu(N). The hyperfine structure and nuclear magnetic resonance of optically polarized Mg-29-observed in the asymmetry of its beta decay after implantation in a cubic crystal-give I = 3/2 and mu(I) (Mg-29) = +0.9780(6) mu(N). For Mg-31 they yield together I = 1/2 and mu(I) (Mg-31) = -0.88355(15) mu(N), where the negative magnetic moment provides evidence for a positive parity. The results for 27Mg and 29Mg agree well with shell-model calculations confined only to the sd model space, whereas the ground state of Mg-31 involves large contributions from neutrons in the pf shell, which places this nucleus inside the "island of inversion.".

引用

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