LOW-LYING LEVELS IN NA-25

Information about the 90-, 1068-, 2201-, 2417-, 2788-, 2914,- and 3353-keV levels in Na25 has been obtained by measuring γ-ray angular correlations in a collinear geometry. The Mg26(t,α)Na25 reaction was used to populate the levels of Na25 at an incident triton energy of 2.6 MeV. NaI (Tl) detectors were used for γ-ray spectroscopy. γ-ray angular correlations were obtained by measuring the yield of γ rays at angles between 0 ° and 90 °in coincidence with reaction-produced α particles detected near 180 °with respect to the incident-beam direction. The α-γ coincidence data were collected employing two-parameter analysis. γ-ray branching data were obtained for all the levels mentioned above, and angular correlations were extracted from these data for γ rays from the decay of the 1068-, 2201-, 2914-, and 3353-keV levels. Analysis of these data resulted in a definite spin assignment for only one level: J=32 for the 2201-keV level. The spin of the 90-keV level was restricted to either J=32 52, while the 2914- and 3353-keV levels have spin J.