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,γ) 27Si and 26mAl(p,γ)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,α)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 Jπ 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 γ-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. © 2011 American Physical Society.
Publication Source (Journal or Book title)
Physical Review C - Nuclear Physics
Parikh, A., Wimmer, K., Faestermann, T., Hertenberger, R., Wirth, H., Chen, A., Clark, J., Deibel, C., Herlitzius, C., Krücken, R., Seiler, D., Setoodehnia, K., Straub, K., & Wrede, C. (2011). Production of 26Al in stellar hydrogen-burning environments: Spectroscopic properties of states in 27Si. Physical Review C - Nuclear Physics, 84 (6) https://doi.org/10.1103/PhysRevC.84.065808