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

J. Marganiec ; F. Wamers ; F. Aksouh ; Y. Aksyutina ; H. Alvarez-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. Heil ; D. H. H. Hoffmann ; J. Hoffmann ; Håkan T. Johansson (Institutionen för fundamental fysik) ; Björn Jonson (Institutionen för fundamental fysik) ; C. Karagiannis ; O. A. Kiselev ; J. V. Kratz ; R. Kulessa ; N. Kurz ; C. Langer ; M. Lantz ; T. Le Bleis ; R. Lemmon ; Y. A. Litvinov ; K. Mahata ; C. Muntz ; Thomas Nilsson (Institutionen för fundamental fysik) ; C. Nociforo ; Göran Nyman (Institutionen för fundamental fysik) ; 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. Summerer ; O. Tengblad ; H. Weick ; M. Wiescher ; C. Wimmer ; Mikhail V. Zhukov (Institutionen för fundamental fysik)
European Physical Journal A (1434-6001). Vol. 51 (2015), 1,
[Artikel, refereegranskad vetenskaplig]

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.

Denna post skapades 2015-03-17. Senast ändrad 2015-03-30.
CPL Pubid: 213914


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