The Angular Distribution of α-particles from the Reaction ¹⁹F(pα)¹⁶O^*(π)¹⁶O

Abstract

The angular distribution of α-particles from the reaction ¹⁹F(pα)¹⁶O^*(π)¹⁶O has been measured at fourteen energies between 800 kev and 1400 kev. The α -particles were detected and identified by coincidence with nuclear pair-electrons. The data were analyzed to give coefficients in the expansion formula σ(θ)=a₀+a₁cosθ+a₂cos²θ+a₃cos³θ+a₄cos⁴θ. The spins of the levels of the compound nucleus ²⁰Ne were assigned from the evidence of anomalies in the coefficients. For the resonances at 843−, 1126−, 1355−kev J=2 and for that at 1250 kev J=1.