Nuclear spectroscopy of 26Al

Abstract

The tensor analyzing powers T 20 and the cross sections for the reaction 28 Si( d , α) 26 Al to levels in 26Al with excitation energies up to 6 MeV have been measured at θ lab = 175°. The bombarding energy was varied in steps of 0.5 MeV from 10.0 to 12.5 MeV. Comparison of the measured T 20 values with theoretical predictions, taking into account the finite-angle effect, has led to assignments of natural or unnatural parity to some fifty levels in 26Al. Two levels with J π = 0 − could be identified on the basis of such a comparison. A (probable) assignment of J π = 0 + could be made to two levels in 26Al on the basis of a very low observed cross section. The information on spin-parity combinations found in this work was combined with spectroscopic data from other reactions to deduce new unambiguous J π assignments for 33 levels and J π restrictions for another three levels.