Direct measurement of the $^{18}\mathrm{F}$($p$,$\ensuremath{\alpha}$)$^{15}\mathrm{O}$ reaction at nova temperatures

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Direct measurement of the ${}^{18}F$ ( $p$ , $α$ ) ${}^{15}O$ reaction at nova temperatures

C. E. Beer, A. M. Laird, A. St. J. Murphy, M. A. Bentley, L. Buchman, B. Davids, T. Davinson, C. A. Diget, S. P. Fox, B. R. Fulton, U. Hager, D. Howell, L. Martin, C. Ruiz, G. Ruprecht, P. Salter, C. Vockenhuber, and P. Walden

Phys. Rev. C 83, 042801(R) – Published 12 April 2011

Abstract

The $^{18} F (p, α)^{15}$ O reaction rate is crucial for understanding the final abundance of ${}^{18}F$ predicted by nova models. The $γ$ -ray emission in the first few hours after a nova outburst is expected to be dominated by 511 keV annihilation photons from the decay of ${}^{18}F$ , and so understanding its production can provide important constraints on the conditions during the outburst when compared with observations. Results are presented from the lowest-energy direct measurement to date, performed at the Isotope Separator and Accelerator radioactive beam facility at the TRIUMF laboratory, Canada. Cross section measurements at center-of-mass energies of 250, 330, 453, and 673 keV are obtained and the results compared to previous data and $R$ -matrix calculations. The implications for the overall reaction rate in the context of nova explosions have been discussed.

Received 16 December 2010

DOI:https://doi.org/10.1103/PhysRevC.83.042801

Authors & Affiliations

C. E. Beer¹, A. M. Laird^1,*, A. St. J. Murphy², M. A. Bentley¹, L. Buchman³, B. Davids³, T. Davinson², C. A. Diget¹, S. P. Fox¹, B. R. Fulton¹, U. Hager^3,†, D. Howell³, L. Martin³, C. Ruiz³, G. Ruprecht³, P. Salter², C. Vockenhuber^3,‡, and P. Walden³

¹Department of Physics, University of York, York YO10 5DD, United Kingdom
²SUPA, School of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
³TRIUMF, Vancouver, British Columbia V6T 2A3, Canada

^*Corresponding author: alison.laird@york.ac.uk
^†Present address: Colorado School of Mines, Golden, Co, USA.
^‡Present address: ETH Zurich, Zurich, Switzerland.

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Vol. 83, Iss. 4 — April 2011

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Physical Review C

covering nuclear physics

Direct measurement of the ${}^{18}F$ ( $p$ , $α$ ) ${}^{15}O$ reaction at nova temperatures

C. E. Beer, A. M. Laird, A. St. J. Murphy, M. A. Bentley, L. Buchman, B. Davids, T. Davinson, C. A. Diget, S. P. Fox, B. R. Fulton, U. Hager, D. Howell, L. Martin, C. Ruiz, G. Ruprecht, P. Salter, C. Vockenhuber, and P. Walden

Phys. Rev. C 83, 042801(R) – Published 12 April 2011

Abstract

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Physical Review C

covering nuclear physics

Direct measurement of the F18(p,α)O15 reaction at nova temperatures

C. E. Beer, A. M. Laird, A. St. J. Murphy, M. A. Bentley, L. Buchman, B. Davids, T. Davinson, C. A. Diget, S. P. Fox, B. R. Fulton, U. Hager, D. Howell, L. Martin, C. Ruiz, G. Ruprecht, P. Salter, C. Vockenhuber, and P. Walden

Phys. Rev. C 83, 042801(R) – Published 12 April 2011

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Direct measurement of the ${}^{18}F$ ( $p$ , $α$ ) ${}^{15}O$ reaction at nova temperatures