29Na: Defining the edge of the Island of Inversion for Z=11

Details 29Na: Defining the edge of the Island of Inversion for Z=11 29Na: Defining the edge of the Island of Inversion for Z=11

2004-11-17

arxiv.org/abs/nucl-ex/0411031v1

Phys.Rev.Lett. 94 (2005) 162501

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.94.162501

The low-energy level structure of the exotic Na isotopes 28,29Na has been investigated through beta-delayed gamma spectroscopy. The N=20 isotones for Z=10-12 are considered to belong to the ``island of inversion'' where intruder configurations dominate the ground state wave function. However, it is an open question as to where and how the transition from normal to intruder-dominated configurations happens in an isotopic chain. The present work, which presents the first detailed spectroscopy of 28,29Na, clearly demonstrates that such a transition in the Na isotopes occurs between 28Na (N=17) and 29Na (N=18), supporting the smaller N=20 shell gap in neutron rich sd shell nuclei. The evidence for inverted shell structure is found in intruder dominated spectroscopy of low-lying states, beta-decay branching ratios and shell model analysis.

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