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Phys. Rev. C 82, 025807 (2010) [12 pages]

High-precision (p,t) reaction to determine 25Al(p,γ)26Si reaction rates

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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

G. P. A. Berg, M. Couder, 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, P.O. Wits, Johannesburg 2050, South Africa

T. Wakasa
Department of Physics, Kyushu University, Fukuoka 812-8581, Japan

B. A. Brown and H. Schatz
Department of Physics and Astronomy, National Superconducting Cyclotron Laboratory and the Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA

Received 15 June 2010; published 18 August 2010

Since the identification of ongoing 26Al production in the universe, the reaction sequence 24Mg(p,γ)25Al(β+ν)25Mg(p,γ)26Al has been studied intensively. At temperatures where the radiative capture on 25Al (t1/2=7.2 s) becomes faster than the β+ decay, the production of 26Al can be reduced due to the depletion of 25Al. To determine the resonances relevant for the 25Al(p,γ)26Si bypass reaction, we measured the 28Si(p,t)26Si reaction with high-energy precision using the Grand Raiden spectrometer at the Research Center for Nuclear Physics, Osaka. Several new energy levels were found above the p threshold and for known states excitation energies were determined with smaller uncertainties. The calculated stellar rates of the bypass reaction agree well with previous results, suggesting that these rates are well established.

© 2010 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.82.025807
DOI:
10.1103/PhysRevC.82.025807
PACS:
25.40.Hs, 26.30.Ca, 26.50.+x, 27.30.+t

*Present address: Forschungszentrum Dresden-Rossendorf, Postfach 510119, 01314 Dresden, D-01328 Dresden, Germany.

†Present address: GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, D-64291 Darmstadt, Germany.

‡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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