βdelayed particle decay of 9C and the A=9, T=1/2 nuclear system: Rmatrix fits, the A=9 nuclear system, and the stellar reaction rate of 4He(αn,γ)9Be

L. Buchmann, E. Gete, J. C. Chow, J. D. King, and D. F. Measday
Phys. Rev. C 63, 034303 – Published 2 February 2001
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Abstract

The decay of 9C (T1/2=126.5 ms) has been observed in two experiments at the TISOL facility at TRIUMF employing different detector configurations for each run. In the first of two papers [E. Gete et al., Phys. Rev. C 61, 064310 (2000)], the experimental technique and data analysis were described. Phenomenological branching ratios and Gamow-Teller strengths were then deduced. In this paper, the data are analyzed using a multichannel, multistate Rmatrix approach which leads to a different interpretation of the spectra and therefore modified state energies, widths, branching ratios, and Gamow-Teller strengths. Difficulties in fitting the second excited state of 9B at 2.34 MeV and possible modifications to the penetrability are described. The existence of a Jπ=1/2 state at about 5 MeV excitation energy is suggested from the fits, as well as a considerable decay strength from the 9B ground state at high energies. Consequences for the properties of the A=9, T=1/2 nuclear system are then discussed; in particular, it is shown that the data agree qualitatively with shell model predictions without unusual Gamow-Teller strength present at high excitation energies. Finally, an estimate of the 4He(αn,γ)9Be stellar reaction rate is given.

  • Received 22 June 2000

DOI:https://doi.org/10.1103/PhysRevC.63.034303

©2001 American Physical Society

Authors & Affiliations

L. Buchmann1, E. Gete2,*, J. C. Chow3, J. D. King3, and D. F. Measday2

  • 1TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
  • 2Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
  • 3Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7

  • *Present address: London Regional Cancer Center, London, Ontario, Canada.

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Vol. 63, Iss. 3 — March 2001

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