Level structure of Si26 and its implications for the astrophysical reaction rate of Al25(p,γ)Si26

D. Seweryniak, M.P. Carpenter, R.V.F. Janssens, T. Lauritsen, C.J. Lister, J. Shergur, S. Sinha, P.J. Woods, T. Davinson, D.G. Jenkins, A. Woehr

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Abstract

A study of the level structure of Si26 using in-beam γ-ray spectroscopy is presented. A full level scheme is derived incorporating all states lying below the proton threshold energy. The results are in good agreement with shell model predictions and one-to-one correspondence is found with states in the mirror nucleus Mg26. Additionally, a γ-decay branch is observed from a state at 5677.0(17) keV, which is assigned to a 1+ resonance important in the astrophysical reaction Al25(p,γ)Si26. The newly derived resonance energy, Er=159.2(35) keV, has the effect of decreasing the reaction rate at the novae ignition temperature of 0.1 GK by a factor of 2 when compared with the previous most precise measurement of this state. © 2007 The American Physical Society.
Original languageEnglish
JournalPhysical Review C
Volume75
Issue number6
DOIs
Publication statusPublished - 8 Jun 2007

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