Spin and magnetic moment of 33Mg: evidence for a negative-parity intruder ground state.
We report on the first determination of the nuclear ground-state spin of 33Mg, I=3/2, and its magnetic moment, mu= -0.7456(5) mu(N), by combining laser spectroscopy with nuclear magnetic resonance techniques. These values are inconsistent with an earlier suggested 1 particle-1 hole configuration and provide evidence for a 2 particle-2 hole intruder ground state with negative parity. The results are in agreement with an odd-neutron occupation of the 3/2 [321] Nilsson orbital at a large prolate deformation. The discussion emphasizes the need of further theoretical and experimental investigation of the island of inversion, a region previously thought to be well understood.
Yordanov
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DT
Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium.
Kowalska
M
M
Blaum
K
K
De Rydt
M
M
Flanagan
K T
KT
Lievens
P
P
Neugart
R
R
Neyens
G
G
Stroke
H H
HH