Isobaric analogue states of 10Be- 10B

Abstract

A study has been made of the 5.96 and 6.26 MeV levels of 10Be. Electromagnetic transitions following the 9Be(d,p) 10Be reaction were examined. Spectra in coincidence with the proton groups were analysed to determine γ-ray branching ratios. The result of a γ-γ correlation measurement upon the cascade γ-rays from both states was consistent with J = 2 for both states. The correlation observed for the decay of the 5.96 MeV states is not consistent with that of a 1 − state. However, it is suggested that a 1 −−2 + doublet exists at 5.96 MeV in 10Be with the J = 2 member decaying predominately by cascade through the 3.37 MeV state; and the J = 1 member decaying predominately by a direct ground state transition. Experimental confirmation of the doublet structure at 5.96 MeV was obtained and a level separation of 1.6±0.5 keV determined with the 2 + level being lower in excitation. Proton angular distributions at 2.8 MeV deuteron energy were determined for the individual members of the doublet to establish the parities of the states. Spectroscopic factors and reduced widths for the individual members of the doublet were extracted from plane-wave and distorted-wave analyses of the angular distributions.