Line-shape analysis of Doppler-broadened $\ensuremath{\gamma}$ lines following the $\ensuremath{\beta}$ decay of $^{11}\mathrm{Li}$

Line-shape analysis of Doppler-broadened $γ$ lines following the $β$ decay of ${}^{11}{Li}$

C. M. Mattoon, F. Sarazin, C. Andreoiu, A. N. Andreyev, R. A. E. Austin, G. C. Ball, R. S. Chakrawarthy, D. Cross, E. S. Cunningham, J. Daoud, P. E. Garrett, G. F. Grinyer, G. Hackman, D. Melconian, C. Morton, C. Pearson, J. J. Ressler, J. Schwarzenberg, M. B. Smith, and C. E. Svensson

Phys. Rev. C 80, 034318 – Published 23 September 2009

Abstract

The $β$ decay of ${}^{11}{Li}$ is studied at the TRIUMF Isotope Separation and Acceleration (ISAC) facility using the $8 π γ$ -ray spectrometer coupled with an inner array of $20$ plastic scintillators for $β$ detection. Doppler-broadened line shapes resulting from the decay of the excited states in ${}^{10}{Be}$ populated by $β$ -delayed one-neutron emission are analyzed using Monte Carlo simulations. New $β$ -delayed neutron decay branches are shown to contribute to the complex decay of ${}^{11}{Li}$ . The half-lives of all but one bound excited state in ${}^{10}{Be}$ are also deduced from this work. Among them, the half-life of the $2^{-}$ state in ${}^{10}{Be}$ is shown to be much shorter than previously thought, yielding a new experimental $B (E 1)$ now well within the range of theoretical predictions and providing further evidence that the $2^{-}$ state in ${}^{10}{Be}$ is an excited halo state. The nature of the $8.82$ -MeV state in ${}^{11}{Be}$ and its decay paths to excited states in ${}^{10}{Be}$ are found to be consistent with the $β$ decay of the core proceeding through this particular state.

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Received 19 June 2009

DOI:https://doi.org/10.1103/PhysRevC.80.034318

Authors & Affiliations

C. M. Mattoon^1,*, F. Sarazin^1,†, C. Andreoiu², A. N. Andreyev^3,‡, R. A. E. Austin⁴, G. C. Ball³, R. S. Chakrawarthy³, D. Cross², E. S. Cunningham³, J. Daoud³, P. E. Garrett⁵, G. F. Grinyer^5,§, G. Hackman³, D. Melconian^6,7, C. Morton³, C. Pearson³, J. J. Ressler², J. Schwarzenberg⁸, M. B. Smith^3,∥, and C. E. Svensson⁵

¹Department of Physics, Colorado School of Mines, Golden, CO 80401, USA
²Department of Chemistry, Simon Fraser University, Burnaby, BC, V5A 1S6, Canada
³TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
⁴Department of Physics and Astronomy, Saint Mary's University, Halifax, NS, B3H 3C3, Canada
⁵Department of Physics, University of Guelph, Guelph, ON, N1G 2W1, Canada
⁶Department of Physics, Simon Fraser University, Burnaby, BC, V5A 1S6, Canada
⁷Department of Physics, Texas A&M, College Station, TX 77843, USA
⁸Department of Nuclear Physics, University of Vienna, Waehringerstrasse 17, AT-1090 Vienna, Austria

^*Present Address: National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973, USA.
^†Corresponding author:fsarazin@mines.edu
^‡Present address: Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, BE-3001 Leuven, Belgium.
^§Present address: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA.
^∥Present address: Bubble Technology Industries, P. O. Box 100, Chalk River, ON, K0J 1J0, Canada.

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Vol. 80, Iss. 3 — September 2009

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Physical Review C

covering nuclear physics

Line-shape analysis of Doppler-broadened $γ$ lines following the $β$ decay of ${}^{11}{Li}$

C. M. Mattoon, F. Sarazin, C. Andreoiu, A. N. Andreyev, R. A. E. Austin, G. C. Ball, R. S. Chakrawarthy, D. Cross, E. S. Cunningham, J. Daoud, P. E. Garrett, G. F. Grinyer, G. Hackman, D. Melconian, C. Morton, C. Pearson, J. J. Ressler, J. Schwarzenberg, M. B. Smith, and C. E. Svensson

Phys. Rev. C 80, 034318 – Published 23 September 2009

Abstract

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Physical Review C

covering nuclear physics

Line-shape analysis of Doppler-broadened γ lines following the β decay of Li11

C. M. Mattoon, F. Sarazin, C. Andreoiu, A. N. Andreyev, R. A. E. Austin, G. C. Ball, R. S. Chakrawarthy, D. Cross, E. S. Cunningham, J. Daoud, P. E. Garrett, G. F. Grinyer, G. Hackman, D. Melconian, C. Morton, C. Pearson, J. J. Ressler, J. Schwarzenberg, M. B. Smith, and C. E. Svensson

Phys. Rev. C 80, 034318 – Published 23 September 2009

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Line-shape analysis of Doppler-broadened $γ$ lines following the $β$ decay of ${}^{11}{Li}$