High-precision 28Si(p,t)26Si reaction to determine 22Mg(α,p)25Al reaction rates

A. Matic, A. M. Van Den Berg, M. N. Harakeh, H. J. Wörtche, M. Beard, G. P.A. Berg, J. Görres, P. Leblanc, S. O'Brien, M. Wiescher, K. Fujita, K. Hatanaka, Y. Sakemi, Y. Shimizu, Y. Tameshige, A. Tamii, M. Yosoi, T. Adachi, Y. Fujita, Y. ShimbaraH. Fujita, T. Wakasa, J. P. Greene, R. Crowter, H. Schatz

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Abstract

The rise time of stellar x-ray bursts is a signature of thermonuclear runaway processes in the atmosphere of neutron stars and is highly sensitive to a series of (α,p) reactions via high-lying resonances in sd-shell nuclei. Lacking data for the relevant resonance levels, the stellar reaction rates have been calculated using statistical, Hauser-Feshbach models, assuming a high-level density. This assumption may not be correct in view of the selectivity of the (α,p) reaction to natural parity states. We measured the 28Si(p,t)26Si reaction with a high-resolution spectrometer to identify resonance levels in 26Si above the α-emission threshold at 9.164 MeV excitation energy. These resonance levels are used to calculate the stellar reaction rate of the 22Mg(α,p)25Al reaction and to test the validity of the statistical assumption.

Original languageEnglish
Article number025801
JournalPhysical Review C - Nuclear Physics
Volume84
Issue number2
DOIs
Publication statusPublished - Aug 24 2011

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Matic, A., Van Den Berg, A. M., Harakeh, M. N., Wörtche, H. J., Beard, M., Berg, G. P. A., ... Schatz, H. (2011). High-precision 28Si(p,t)26Si reaction to determine 22Mg(α,p)25Al reaction rates. Physical Review C - Nuclear Physics, 84(2), [025801]. https://doi.org/10.1103/PhysRevC.84.025801