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

J. Marganiec, F. Wamers, F. Aksouh, Yu Aksyutina, H. Álvarez-Pol, T. Aumann, S. Beceiro-Novo, K. Boretzky, M. J G Borge, M. Chartier, A. Chatillon, L. V. Chulkov, D. Cortina-Gil, H. Emling, O. Ershova, L. M. Fraile, H. O U Fynbo, D. Galaviz, H. Geissel, M. HeilD. H H Hoffmann, J. Hoffmann, H. T. Johansson, B. Jonson*, C. Karagiannis, O. A. Kiselev, J. V. Kratz, R. Kulessa, N. Kurz, C. Langer, M. Lantz, T. Le Bleis, R. Lemmon, Yu A. Litvinov, K. Mahata, C. Müntz, T. Nilsson, C. Nociforo, G. Nyman, W. Ott, V. Panin, S. Paschalis, A. Perea, R. Plag, R. Reifarth, A. Richter, C. Rodriguez-Tajes, D. Rossi, K. Riisager, D. Savran, G. Schrieder, H. Simon, J. Stroth, K. Sümmerer, O. Tengblad, H. Weick, M. Wiescher, C. Wimmer, M. V. Zhukov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number9
Pages (from-to)1-9
Number of pages10
JournalEuropean Physical Journal A : Hadrons and Nuclei
Volume51
DOIs
Publication statusPublished - 2015

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