Abstract
A study of the region of excitation energy between 14 and 21 MeV in 20Ne has been carried out using angular correlation techniques. Alpha decays of continuum levels populated via the 12C( 12C, α) 20Ne reaction were observed to both the ground and excited states of 16O. Measurement of double (α-α) and triple (α-α-γ) angular correlations have been made for levels at E x = 14.26, 15.16, 15.36, 15.88, 16.52, 16.68, 17.40, 18.06, 18.4, 18.7 and 20.67 MeV. Spin assignments were possible for most of these states, many of which confirmed the results of previous work. New spectroscopic information obtained includes the discovery of a closely spaced doublet of states with J π = 7 − at E x = 16.52 and E x = 16.68 MeV, the demonstration that J π = 8 + for the E x = 15.88 MeV level using the dominant decay branch to the 16O 3 − level, and the demonstration that the E x = 20.67 MeV level strongly populated in the 12C( 12C, α) 20Ne reaction has E π = 9 −. Branching ratios to different 16O final states were determined for all levels studied. In addition, an attempt has been made to probe the limitations of the present angular correlation techniques for spectroscopy in this region of mass and excitation energy.
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