Abstract.
Two-proton decay of the unbound \( T_{z} =-2\) nucleus 16Ne , produced in one-neutron knockout from a 500 MeV/u 17Ne beam, has been studied at GSI. The ground state, at a resonance energy 1.388(15) MeV, ( \( \Gamma =0.082(15)\) MeV) above the 14O +p+p threshold, and two narrow resonances at \( E_{r} =3.220(46)\) MeV and 7.57(6) MeV have been investigated. A comparison of the energy difference between the first excited 2+ state and the 0+ ground state in 16Ne with its mirror nucleus 16C reveals a small Thomas-Ehrman shift (TES) of \( +70(46)\) keV. A trend of the TES for the T = 2 quintet is obtained by completing the known data with a prediction for 16F obtained from an IMME analysis. The decay mechanisms of the observed three resonances were revealed from an analysis of the energy and angular correlations of the 14O +p+p decay products. The ground state decay can be considered as a genuine three-body (democratic) mode and the excited states decay sequentially via states in the intermediate nucleus 15F , the 3.22 MeV state predominantly via the 15F ground-state resonance, while the 7.57 MeV state decays via the 5/2+ resonance in 15F at 2.8 MeV above the 14O +p+p threshold. Further, from an analysis of angular correlations, the spin-parity of the 7.57 MeV state has been determined as \( I^{\pi} =2^{+}\) and assigned as the third 2+ state in 16Ne based on a comparison with 16C.
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Marganiec, J., Wamers, F., Aksouh, F. et al. Studies of continuum states in 16 Ne using three-body correlation techniques. Eur. Phys. J. A 51, 9 (2015). https://doi.org/10.1140/epja/i2015-15009-0
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DOI: https://doi.org/10.1140/epja/i2015-15009-0