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17O(α,γ)21Ne and17O(α, n)20Ne for the weak s process

Go?rres, J.; Gu?ray, R. T.; O?zkan, N.; Best, A.; Görres, J.; Beard, M.; Couder, M.; deBoer, R.; Falahat, S.; Güray, R. T.; Kontos, A.; Kratz, K.-L.; LeBlanc, P. J.; Li, Q.; O'Brien, S.; Özkan, N.; Pignatari, M.; Sonnabend, K.; Talwar, R.; Tan, W.; Uberseder, E.; Wiescher, M.

Authors

J. Go?rres

R. T. Gu?ray

N. O?zkan

A. Best

J. Görres

M. Beard

M. Couder

R. deBoer

S. Falahat

R. T. Güray

A. Kontos

K.-L. Kratz

P. J. LeBlanc

Q. Li

S. O'Brien

N. Özkan

M. Pignatari

K. Sonnabend

R. Talwar

W. Tan

E. Uberseder

M. Wiescher



Abstract

The ratio of the reaction rates of the competing channels 17 O(αγ) 21 Ne and 17 O(α,n) 20 Ne determines the efficiency of 16 O as a neutron poison in the s process in low metallicity rotating stars. It has a large impact on the element production, either producing elements to the mass range of A=90 in case of a significant poisoning effect or extending the mass range up to the region of A=150 if the γ channel is of negligible strength. We present an improved study of the reaction 17 O(α,n) 20 Ne, including an independent measurement of the 17 O(α,n 1 ) 20 Ne channel. A simultaneous R-Matrix fit to both the n 0 and the n 1 channels has been performed. New reaction rates, including recent data on the 17 O(α,γ) 21 Ne reaction, have been calculated and used as input for stellar network calculations and their impact on the s process in rotating massive stars is discussed. © 2012 American Institute of Physics.

Citation

Best, A., Görres, J., Beard, M., Couder, M., deBoer, R., Falahat, S., …Wiescher, M. (2012). 17O(α,γ)21Ne and17O(α, n)20Ne for the weak s process. AIP conference proceedings, 1498, 309-313. https://doi.org/10.1063/1.4768509

Journal Article Type Conference Paper
Conference Name EXOTIC NUCLEI AND NUCLEAR/PARTICLE ASTROPHYSICS (IV). FROM NUCLEI TO STARS: Carpathian Summer School of Physics 2012
Conference Location Sinaia, Romania
Acceptance Date Jan 1, 2012
Online Publication Date Dec 1, 2012
Publication Date Dec 1, 2012
Deposit Date Oct 30, 2018
Publicly Available Date Mar 28, 2024
Journal AIP Conference Proceedings
Print ISSN 0094-243X
Electronic ISSN 1551-7616
Publisher American Institute of Physics
Peer Reviewed Peer Reviewed
Volume 1498
Pages 309-313
ISBN 9780735411128
DOI https://doi.org/10.1063/1.4768509
Keywords Helium burning; Neutron poison; S process; R matrix
Public URL https://hull-repository.worktribe.com/output/561946
Publisher URL https://aip.scitation.org/doi/10.1063/1.4768509