Abstract
The 2.79, 3.66, 3.73 and 3.88 MeV states in 21Ne have been studied with the 18O(α, nγ)21Ne reaction at Eα = 4.9 to 6.6 MeV. Both neutrons and γ-rays were observed. The investigation involved measurements of γ-ray angular distributions as well as nγ and γγ angular correlations for procuring spin and multipole mixing information. The results of this investigation combined with previous work lead to respective Jπ assignments of 12−, 32−, 52+ and 52−. The states above 4 MeV excitation energy have been studied at Eα = 7.5 to 11.5 MeV with a Ge(Li)-NaI(Tl) pair spectrometer. Two new states at Ex = 5525.0 ± 1.5 and 5682 ± 2 keV have been found. Evidence is also presented for a doublet comprising the states with excitation energies 5821 ± 3 and 5823 ± 3 keV. Excitation energies, γ-ray decay schemes, mean-lives and limits on spin assignments to all the states are reported. Some of the results are compared with the available data for the mirror nucleus 21Na and discussed in terms of the rotational model.
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