T=3/2STATES IN 21NA AS SEEN IN 20NE(P,P)20NE REACTION

The two lowest T = 3 2 states in 21Na have been observed as narrow scattering anomalies in 20Ne(p, p)20Ne, using a differentially-pumped gas target. The observed resonance energies are Ep = 6.872 ± 0.005 MeV and Ep = 7.128 ± 0.005 MeV corresponding to Ex = 8.973 ± 0.007 MeV and Ex = 9.217 ± 0.007 MeV in 21Na. No other narrow scattering anomaly was found in the proton laboratory energy range 6.76-7.33 MeV although six anomalies of width greater than 13 keV were seen. From an analysis of the data using single level dispersion theory the following parameters were extracted for the T = 3 2 states: for the 8.973 MeV state, Jπ = 5 2+ (or 3 2+), ⊥total < 1.2 keV, ⊥po = 0.10 ± 0.05 keV and, for the 9.217 MeV state, jπ = if 1 2+, ⊥total = 2.3 ± 0. 5keV and ⊥Po = 1.1 ± 0.3 keV. © 1969.