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Studies of continuum states in (16) Ne using three-body correlation techniques
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2015 (English)In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 51, no 1, 9Article in journal (Refereed) Published
Abstract [en]

Two-proton decay of the unbound nucleus Ne-16 , produced in one-neutron knockout from a 500 MeV/u Ne-17 beam, has been studied at GSI. The ground state, at a resonance energy 1.388(15) MeV, ( MeV) above the O-14 +p+p threshold, and two narrow resonances at 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 Ne-16 with its mirror nucleus C-16 reveals a small Thomas-Ehrman shift (TES) of keV. A trend of the TES for the T = 2 quintet is obtained by completing the known data with a prediction for F-16 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 O-14 +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 F-15 , the 3.22 MeV state predominantly via the F-15 ground-state resonance, while the 7.57 MeV state decays via the 5/2(+) resonance in F-15 at 2.8 MeV above the O-14 +p+p threshold. Further, from an analysis of angular correlations, the spin-parity of the 7.57 MeV state has been determined as and assigned as the third 2(+) state in Ne-16 based on a comparison with C-16.

Place, publisher, year, edition, pages
2015. Vol. 51, no 1, 9
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Other Physics Topics
URN: urn:nbn:se:uu:diva-247427DOI: 10.1140/epja/i2015-15009-0ISI: 000348985500001OAI: oai:DiVA.org:uu-247427DiVA: diva2:797153
Available from: 2015-03-23 Created: 2015-03-18 Last updated: 2015-03-23Bibliographically approved

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Lantz, Mattias
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Applied Nuclear Physics
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