Abstract
The 27Al(d,nγ)28Si reaction has been used to study characteristics of bound isobaric analogue levels in 28Si. Neutron energies were determined by time-of-flight techniques using a pulsed incident beam and a large liquid scintillation detector. The neutron detector was placed at 0° thus accentuating lp = 0 transfer. Gamma rays in coincidence with neutrons were detected by a coaxial Ge(Li) spectrometer. The results show good agreement with previously measured branching ratios for the 6 277, 8 589, 9 316 and 9 381 keV levels in 28Si. New information is obtained for the analogue of the 2 139 keV level in 28Al. The excitation energy is found to be 11 434.1 ± 0.7 keV and gamma-ray transitions are observed to T = 0 as well as T = 1 levels. An upper limit for the lifetime of 100 fs is estimated from the experimental results.
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