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Phys. Rev. C 73, 054303 (2006) [10 pages]

β-delayed γ spectroscopy of neutron rich 27,28,29Na

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Vandana Tripathi, S. L. Tabor, C. R. Hoffman, M. Wiedeking*, and A. Volya
Department of Physics, Florida State University, Tallahassee, Florida 32306, USA

P. F. Mantica1,2, A. D. Davies1,3, S. N. Liddick1,2,†, W. F. Mueller1, A. Stolz1, and B. E. Tomlin1,2
1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
2Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
3Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA

T. Otsuka
Department of Physics and Center for Nuclear Study, University of Tokyo, Hongo, Tokyo 113-0033, Japan, and RIKEN, Hirosawa, Wako-shi, Saitama 351-0198, Japan

Y. Utsuno
Advanced Science Research Centre, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan

Received 8 December 2005; published 4 May 2006

The low-energy level structure of the exotic Na isotopes 27,28,29Na has been investigated through β-delayed γ spectroscopy. Detailed level structure of 28,29Na has been obtained through βγ and βγγ coincidence measurements. The low-lying levels populated in 27Na by β decay were found to corroborate well with the in-beam data from the literature. Half-lives of the parent nuclides, 27,28,29Ne, were measured using β fragment as well as fragment βγ coincidences and compared to previous measurements. The β-delayed one- and two-neutron emission branching probabilities have been obtained from the γ activities of the grand daughter nuclei. A comparison of the level schemes and the β-decay branching ratios is made with shell-model predictions, both with and without intruder configurations, to understand the transition from normal-dominant to intruder-dominant excitations in these neutron-rich nuclei approaching the island of inversion.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.73.054303
DOI:
10.1103/PhysRevC.73.054303
PACS:
23.40.-s, 23.20.Lv, 21.60.Cs, 27.30.+t

*Present address: Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

†Present address: Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.

 
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