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

M. Taggart; U. Hager; A. M. Laird; C. Ruiz; D. Hutcheon; D. Ottewell; J. Fallis; L. Erikson; M. Bentley; J. R. Brown; L. Buchmann; A. A. Chen; J. Chen; K. A. Chipps; J. D'Auria; B. Davids; C. Davis; C. A. Diget; S. P. Fox; B. Fulton; N. 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

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

M. Taggart, U. Hager, A. M. Laird, C. Ruiz, D. Hutcheon, D. Ottewell, J. Fallis, L. Erikson, M. Bentley, J. R. Brown, L. Buchmann, A. A. Chen, J. Chen, K. A. Chipps, J. D'Auria, B. Davids, C. Davis, C. A. Diget, S. P. Fox, B. 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 journal › Article › peer-review

Abstract

An experimental campaign to perform the first accurate measurement of the ¹⁷O(α,γ)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 (α,γ)/(α,n) reaction rate ratio. Two distinct energy regions were scanned: a higher region, E_cm ∼ 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, E _cm ∼ 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, 1×10¹² 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 language	English
Journal	Proceedings of Science
Publication status	Published - 1 Dec 2010

Cite this

Taggart, M., Hager, U., Laird, A. M., Ruiz, C., Hutcheon, D., Ottewell, D., Fallis, J., Erikson, L., Bentley, M., Brown, J. R., Buchmann, L., Chen, A. A., Chen, J., Chipps, K. A., D'Auria, J., Davids, B., Davis, C., Diget, C. A., Fox, S. P., ... Veloce, L. (2010). The first direct measurement of ¹⁷O(α,γ) ²¹Ne and its impact upon s-process abundances. Proceedings of Science.

@article{5c24a026ed0d49d1b0fb0c25aa682423,

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

abstract = "An experimental campaign to perform the first accurate measurement of the 17O(α,γ)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 (α,γ)/(α,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, E cm ∼ 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, 1×1012 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.",

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

year = "2010",

month = dec,

day = "1",

language = "English",

journal = "Proceedings of Science",

issn = "1824-8039",

publisher = "Sissa Medialab Srl",

}

Taggart, M, Hager, U, Laird, AM, Ruiz, C, Hutcheon, D, Ottewell, D, Fallis, J, Erikson, L, Bentley, M, Brown, JR, Buchmann, L, Chen, AA, Chen, J, Chipps, KA, D'Auria, J, Davids, B, Davis, C, Diget, CA, Fox, SP, Fulton, B, Galinski, N, Greife, U, Herwig, F, Hirschi, R, Howell, D, Martin, L, Mountford, D, Murphy, A, Pignatari, M, Reeve, S, Ruprecht, G, Sjue, S & Veloce, L 2010, 'The first direct measurement of ¹⁷O(α,γ) ²¹Ne and its impact upon s-process abundances', Proceedings of Science.

TY - JOUR

T1 - The first direct measurement of 17O(α,γ) 21Ne and its impact upon s-process abundances

AU - Taggart, M.

AU - Hager, U.

AU - Laird, A. M.

AU - Ruiz, C.

AU - Hutcheon, D.

AU - Ottewell, D.

AU - Fallis, J.

AU - Erikson, L.

AU - Bentley, M.

AU - Brown, J. R.

AU - Buchmann, L.

AU - Chen, A. A.

AU - Chen, J.

AU - Chipps, K. A.

AU - D'Auria, J.

AU - Davids, B.

AU - Davis, C.

AU - Diget, C. A.

AU - Fox, S. P.

AU - Fulton, B.

AU - Galinski, N.

AU - Greife, U.

AU - Herwig, F.

AU - Hirschi, R.

AU - Howell, D.

AU - Martin, L.

AU - Mountford, D.

AU - Murphy, A.

AU - Pignatari, M.

AU - Reeve, S.

AU - Ruprecht, G.

AU - Sjue, S.

AU - Veloce, L.

PY - 2010/12/1

Y1 - 2010/12/1

N2 - An experimental campaign to perform the first accurate measurement of the 17O(α,γ)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 (α,γ)/(α,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, E cm ∼ 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, 1×1012 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.

AB - An experimental campaign to perform the first accurate measurement of the 17O(α,γ)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 (α,γ)/(α,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, E cm ∼ 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, 1×1012 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.

UR - http://www.scopus.com/inward/record.url?scp=84887482172&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:84887482172

SN - 1824-8039

JO - Proceedings of Science

JF - Proceedings of Science

ER -

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

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