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Studies of continuum states in 16 Ne using three-body correlation techniques

AutorMarganiec, J.; Wamers, F.; Aksouh, F.; García Borge, María José ; Chartier, M.; Galaviz, D. ; Perea, Ángel ; Tengblad, Olof ; Weick, H.; Wiescher, M.; Wimmer, C.; Zhukov, M. V.
Fecha de publicación28-ene-2015
CitaciónEuropean Physical Journal A 51: 1- 9 (2015)
Resumen© 2015, SIF, Springer-Verlag Berlin Heidelberg. Two-proton decay of the unbound Tz = -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, (Γ = 0.082(15) MeV) above the 14O +p+p threshold, and two narrow resonances at Er = 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 IП = 2+ and assigned as the third 2+ state in 16Ne based on a comparison with 16C.
DescripciónJ. Marganiec et al.; 9 pags.; 11 figs.; 2 tabs.
Versión del editorhttp://dx.doi.org/10.1140/epja/i2015-15009-0
Identificadoresdoi: 10.1140/epja/i2015-15009-0
issn: 1434-601X
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