Precision Measurement of {sup 11}Li Moments: Influence of Halo Neutrons on the {sup 9}Li Core

Journal Article · Fri Sep 26 04:00:00 EDT 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.101.132502· OSTI ID:21179752

Neugart, R ^[1]; Balabanski, D L; Borremans, D; Himpe, P; Mallion, S; Neyens, G; Vermeulen, N; Yordanov, D T ^[2]; Blaum, K; Kowalska, M ^[1]; Lievens, P ^[3]

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1. Institut fuer Physik, Universitaet Mainz, D-55099 Mainz (Germany)
2. Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven (Belgium)
3. Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, B-3001 Leuven (Belgium)

The electric quadrupole moment and the magnetic moment of the {sup 11}Li halo nucleus have been measured with more than an order of magnitude higher precision than before, |Q|=33.3(5) mb and {mu}=+3.6712(3){mu}{sub N}, revealing a 8.8(1.5)% increase of the quadrupole moment relative to that of {sup 9}Li. This result is compared to various models that aim at describing the halo properties. In the shell model an increased quadrupole moment points to a significant occupation of the 1d orbits, whereas in a simple halo picture this can be explained by relating the quadrupole moments of the proton distribution to the charge radii. Advanced models so far fail to reproduce simultaneously the trends observed in the radii and quadrupole moments of the lithium isotopes.

• OSTI ID: 21179752
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 13 Vol. 101; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
LITHIUM 11
LITHIUM 9
MAGNETIC MOMENTS
NEUTRONS
NUCLEAR STRUCTURE
PROTONS
QUADRUPOLE MOMENTS
SHELL MODELS