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Phys. Rev. C 70, 031302(R) (2004) [5 pages]

Halo neutrons and the β decay of 11Li

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F. Sarazin1,2,*, J. S. Al-Khalili2,3, G. C. Ball2, G. Hackman2, P. M. Walker2,3, R. A. E. Austin4,†, B. Eshpeter2, P. Finlay5, P. E. Garrett6, G. F. Grinyer5, K. A. Koopmans4, W. D. Kulp7, J. R. Leslie8, D. Melconian9, C. J. Osborne2,‡, M. A. Schumaker5, H. C. Scraggs2,§, J. Schwarzenberg10, M. B. Smith2, C. E. Svensson5, J. C. Waddington4, and J. L. Wood7
1Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
2TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
3Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
4Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4K1
5Department of Physics, University of Guelph, Guelph, Ontario, Canada N1G 2W1
6Lawrence Livermore National Laboratory, Livermore, California 94551, USA
7School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
8Department of Physics, Queen’s University, Kingston, Ontario, Canada K7L 3N6
9Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
10Department of Nuclear Physics, University of Vienna, Waehringerstrasse 17, Vienna, 1090 Austria

Received 12 July 2004; published 21 September 2004

The β decay of 11Li has been investigated at TRIUMF-ISAC using a high-efficiency array of Compton suppressed HPGe detectors. From a line-shape analysis of the Doppler-broadened peaks observed in the 10Be γ spectrum, both the half-lives of states in 10Be and the energies of the β-delayed neutrons feeding those states were obtained. Furthermore, it was possible to determine the excitation energies of the parent states in 11Be with uncertainties comparable to those obtained from neutron spectroscopy experiments. These data suggest that the β decay to the 8.81 MeV state in 11Be occurs in the 9Li core and that one neutron comprising the halo of 11Li survives in a halolike configuration after the β-delayed neutron emission from this level.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.70.031302
DOI:
10.1103/PhysRevC.70.031302
PACS:
23.20.−g, 23.40.−s, 27.20.+n

*Corresponding author. Electronic address: fsarazin@mines.edu

Present address: Department of Physics and Astronomy, Saint Mary’s University, Halifax NS, Canada B3H 3C3.

Present address: Max Planck Institut für Kernphysik, Heidelberg, 69117 Germany.

§Present address: Department of Physics, University of Liverpool, L69 Liverpool, 7ZE United Kingdom.