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Title: Na-29: Defining the edge of the island of inversion for Z=11
Authors: Tripathi, V ×
Tabor, SL
Mantica, PF
Hoffman, CR
Wiedeking, M
Davies, AD
Liddick, SN
Mueller, WF
Otsuka, Taka
Stolz, A
Tomlin, BE
Utsuno, Y
Volya, A #
Issue Date: 2005
Publisher: American Physical Society
Series Title: Physical Review Letters vol:94 issue:16
Article number: 162501
Abstract: The low-energy level structure of the exotic Na isotopes
28
;
29
Na
has been investigated through

-delayed

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
;
29
Na
,
clearly demonstrates that such a transition in the Na isotopes occurs between
28
Na
(
N

17
) and
29
Na
(
N

18
), supporting the smaller
N

20
shell gap in neutron-rich
sd
shell nuclei. The evidence for
inverted shell structure is found in

-decay branching ratios, intruder dominated spectroscopy of low-
lying states, and shell model analysis.
ISSN: 0031-9007
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Non-KU Leuven Association publications
× corresponding author
# (joint) last author

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