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

Research output: Contribution to journalArticle

  • 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

Related Edinburgh Organisations

Original languageEnglish
JournalPhysical Review C
Issue number6
Publication statusPublished - 8 Jun 2007


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.

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