High-precision ${}^{28}$Si($p$,$t$)${}^{26}$Si reaction to determine ${}^{22}$Mg($\ensuremath{\alpha}$,$p$)${}^{25}$Al reaction rates

High-precision $^{28}$ Si( $p$ , $t$ ) $^{26}$ Si reaction to determine $^{22}$ Mg( $α$ , $p$ ) $^{25}$ Al 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, and H. Schatz

Phys. Rev. C 84, 025801 – Published 24 August 2011

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 $s d$ -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 $^{28}$ Si( $p$ , $t$ ) $^{26}$ Si reaction with a high-resolution spectrometer to identify resonance levels in $^{26}$ Si above the $α$ -emission threshold at 9.164 MeV excitation energy. These resonance levels are used to calculate the stellar reaction rate of the $^{22}$ Mg( $α$ , $p$ ) $^{25}$ Al reaction and to test the validity of the statistical assumption.

Received 18 April 2011

DOI:https://doi.org/10.1103/PhysRevC.84.025801

Authors & Affiliations

A. Matic^*, A. M. van den Berg, M. N. Harakeh^†, and H. J. Wörtche^‡

Kernfysisch Versneller Instituut, University of Groningen, Zernikelaan 25, NL-9747 AA Groningen, The Netherlands

M. Beard, G. P. A. Berg, J. Görres, P. LeBlanc, S. O’Brien, and M. Wiescher

Department of Physics and the Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA

K. Fujita, K. Hatanaka, Y. Sakemi, Y. Shimizu^§, Y. Tameshige^∥, A. Tamii, and M. Yosoi

Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 560-0047, Japan

T. Adachi, Y. Fujita, and Y. Shimbara

Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan

H. Fujita

School of Physics, University of the Witwatersrand, PO Wits, Johannesburg 2050, South Africa

T. Wakasa

Department of Physics, Kyushu University, Fukuoka 812-8581, Japan

J. P. Greene

Physics Division, Argonne National Laboratory, 9700 S. Cass. Avenue, Argonne, Illinois 60439, USA

R. Crowter

Department of Physics, University of Surrey, United Kingdom

H. Schatz

National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA

^*Present address: IBA Particle Therapy, Am Mühlenbach 1, DE-45147 Essen, Germany.
^†Present address: GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstrae 1, DE-64291 Darmstadt, Germany.
^‡Present address: INCAS3, Assen, The Netherlands.
^§Present address: Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan.
^∥Present address: Office for Development of Proton Therapy Center, Regional Health Services Division, Department of Health and Welfare Fukui Prefectural Government, Fukui City, Fukui Prefecture 910-0846, Japan.

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Vol. 84, Iss. 2 — August 2011

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Physical Review C

covering nuclear physics

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

Phys. Rev. C 84, 025801 – Published 24 August 2011

Abstract

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Physical Review C

covering nuclear physics

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

Phys. Rev. C 84, 025801 – Published 24 August 2011

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