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. Shimbara; H. Fujita; T. Wakasa; J. P. Greene; R. Crowter; H. Schatz

doi:10.1103/PhysRevC.84.025801

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

Experimental Particle Physics

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

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 language	English
Article number	025801
Journal	Physical Review C - Nuclear Physics
Volume	84
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevC.84.025801
Publication status	Published - Aug 24 2011

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1103/PhysRevC.84.025801

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

High-precision 28Si(p,t)26Si reaction to determine 22Mg(α,p)25Al reaction rates. / Matic, A.; Van Den Berg, A. M.; Harakeh, M. N.; Wörtche, H. J.; Beard, M.; Berg, G. P.A.; Görres, J.; Leblanc, P.; O'Brien, S.; Wiescher, M.; Fujita, K.; Hatanaka, K.; Sakemi, Y.; Shimizu, Y.; Tameshige, Y.; Tamii, A.; Yosoi, M.; Adachi, T.; Fujita, Y.; Shimbara, Y.; Fujita, H.; Wakasa, T.; Greene, J. P.; Crowter, R.; Schatz, H.

In: Physical Review C - Nuclear Physics, Vol. 84, No. 2, 025801, 24.08.2011.

Research output: Contribution to journal › Article › peer-review

Matic, A, Van Den Berg, AM, Harakeh, MN, Wörtche, HJ, Beard, M, Berg, GPA, Görres, J, Leblanc, P, O'Brien, S, Wiescher, M, Fujita, K, Hatanaka, K, Sakemi, Y, Shimizu, Y, Tameshige, Y, Tamii, A, Yosoi, M, Adachi, T, Fujita, Y, Shimbara, Y, Fujita, H, Wakasa, T, Greene, JP, Crowter, R & Schatz, H 2011, 'High-precision 28Si(p,t)26Si reaction to determine 22Mg(α,p)25Al reaction rates', Physical Review C - Nuclear Physics, vol. 84, no. 2, 025801. https://doi.org/10.1103/PhysRevC.84.025801

Matic, A. ; Van Den Berg, A. M. ; Harakeh, M. N. ; Wörtche, H. J. ; Beard, M. ; Berg, G. P.A. ; Görres, J. ; Leblanc, P. ; O'Brien, S. ; Wiescher, M. ; Fujita, K. ; Hatanaka, K. ; Sakemi, Y. ; Shimizu, Y. ; Tameshige, Y. ; Tamii, A. ; Yosoi, M. ; Adachi, T. ; Fujita, Y. ; Shimbara, Y. ; Fujita, H. ; Wakasa, T. ; Greene, J. P. ; Crowter, R. ; Schatz, H. / High-precision 28Si(p,t)26Si reaction to determine 22Mg(α,p)25Al reaction rates. In: Physical Review C - Nuclear Physics. 2011 ; Vol. 84, No. 2.

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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.",

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AU - Matic, A.

AU - Van Den Berg, A. M.

AU - Harakeh, M. N.

AU - Wörtche, H. J.

AU - Beard, M.

AU - Berg, G. P.A.

AU - Görres, J.

AU - Leblanc, P.

AU - O'Brien, S.

AU - Wiescher, M.

AU - Fujita, K.

AU - Hatanaka, K.

AU - Sakemi, Y.

AU - Shimizu, Y.

AU - Tameshige, Y.

AU - Tamii, A.

AU - Yosoi, M.

AU - Adachi, T.

AU - Fujita, Y.

AU - Shimbara, Y.

AU - Fujita, H.

AU - Wakasa, T.

AU - Greene, J. P.

AU - Crowter, R.

AU - Schatz, H.

PY - 2011/8/24

Y1 - 2011/8/24

N2 - 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.

AB - 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.

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