Production of26Al in stellar hydrogen-burning environments: Spectroscopic properties of states in27Si Academic Article uri icon

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abstract

  • Model predictions of the amount of the radioisotope 26Al produced in hydrogen-burning environments require reliable estimates of the thermonuclear rates for the 26gAl(p,{\gamma})27Si and 26mAl(p,{\gamma})27Si reactions. These rates depend upon the spectroscopic properties of states in 27Si within about 1 MeV of the 26gAl+p threshold (Sp = 7463 keV). We have studied the 28Si(3He,{\alpha})27Si reaction at 25 MeV using a high-resolution quadrupole-dipole-dipole-dipole magnetic spectrograph. For the first time with a transfer reaction, we have constrained J{\pi} values for states in 27Si over Ex = 7.0 - 8.1 MeV through angular distribution measurements. Aside from a few important cases, we generally confirm the energies and spin-parity assignments reported in a recent {\gamma}-ray spectroscopy study. The magnitudes of neutron spectroscopic factors determined from shell-model calculations are in reasonable agreement with our experimental values extracted using this reaction.

authors

  • Parikh, A
  • Wimmer, K
  • Faestermann, T
  • Hertenberger, R
  • Wirth, H-F
  • Chen, Alan
  • Clark, JA
  • Deibel, CM
  • Herlitzius, C
  • Krücken, R
  • Seiler, D
  • Setoodehnia, K
  • Straub, K
  • Wrede, C

publication date

  • December 27, 2011