The first direct measurement of 17O(α,γ)21Ne and its impact upon s-process abundances

M. Taggart, U. Hager, A. Laird, C. Ruiz, D. Hutcheon, D. F. Ottewell, J. Fallis, L. Erikson, M. Bentley, J. Brown, L. Buchmann, A. A. Chen, J. Chen, K. Chipps, J. D'Auria, B. Davids, C. Davis, C. A. Diget, S. P. Fox, B. R. FultonN. Galinski, U. Greife, F. Herwig, R. Hirschi, D. Howell, L. Martin, D. Mountford, A. Murphy, M. Pignatari, S. Reeve, G. Ruprecht, S. Sjue, L. Veloce

Research output: Contribution to conferencePaperpeer-review


An experimental campaign to perform the first accurate measurement of the 17O(a,g)21Ne reaction rate was carried out during May and November 2009 at the DRAGON recoil separator in the TRIUMF laboratory, Vancouver, Canada. The goals were to differentiate between two previous conflicting theoretical predictions, and to establish the (a,g)/(a,n) reaction rate ratio.
Two distinct energy regions were scanned: a higher region, Ecm 1.5 MeV, where the recoil cone was sufficiently confined and the cross section sufficiently large so that a statistically significant yield could be achieved, and a lower region, Ecm 0.7 MeV, chosen to approach the astrophysical
energies and reduce errors from extrapolation. The experiment, performed in inverse kinematics, used the highest intensity beam ever delivered
to DRAGON, 11012 pps of 17O incident on a 4He gas target. An array of 30 Bismuth Germanate (BGO) detectors [1] was used in conjunction with two microchannel plates (MCP) [2] for a local time-of-flight measurement, and ion chamber for coincident event detection.
Original languageEnglish
Number of pages45
Publication statusPublished - 2010
Event11th Symposium on Nuclei in the Cosmos, NIC XI - Heidelberg, Germany
Duration: 19 Jul 201023 Jul 2010


Conference11th Symposium on Nuclei in the Cosmos, NIC XI


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