Voyage to the 'Island of Inversion': 29Na

Authors :: C. R. Hoffman
Vandana Tripathi
P. F. Mantica
Alexander Volya
Sean Liddick
M. Wiedeking
Andreas Stolz
S. L. Tabor
A. D. Davies
W. F. Mueller
B. E. Tomlin
Source :: The European Physical Journal A. 25:101-103
Publication Year :: 2005
Publisher :: Springer Science and Business Media LLC, 2005.
Abstract: The low energy level structure of neutron-rich 28,29Na has been investigated through β-delayed γ spectroscopy. The present work, which presents the first detailed spectroscopy of 29Na, clearly demonstrates that for Na isotopes between 28Na (N = 17) and 29Na (N = 18), intruder configurations start dominating the low lying excited states, suggestive of the small N = 20 shell gap.