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. 2014 Apr 4;112(13):132502.
doi: 10.1103/PhysRevLett.112.132502. Epub 2014 Apr 4.

First observation of the unbound nucleus 15Ne

F Wamers  1 , J Marganiec  2 , F Aksouh  3 , Yu Aksyutina  3 , H Álvarez-Pol  4 , T Aumann  5 , S Beceiro-Novo  4 , K Boretzky  3 , M J G Borge  6 , M Chartier  7 , A Chatillon  3 , L V Chulkov  8 , D Cortina-Gil  4 , H Emling  3 , O Ershova  9 , L M Fraile  10 , H O U Fynbo  11 , D Galaviz  6 , H Geissel  3 , M Heil  3 , D H H Hoffmann  12 , H T Johansson  13 , B Jonson  13 , C Karagiannis  3 , O A Kiselev  3 , J V Kratz  14 , R Kulessa  15 , N Kurz  3 , C Langer  9 , M Lantz  16 , T Le Bleis  17 , R Lemmon  18 , Yu A Litvinov  3 , K Mahata  19 , C Müntz  20 , T Nilsson  13 , C Nociforo  3 , G Nyman  13 , W Ott  3 , V Panin  5 , S Paschalis  21 , A Perea  6 , R Plag  9 , R Reifarth  9 , A Richter  12 , C Rodriguez-Tajes  4 , D Rossi  22 , K Riisager  11 , D Savran  23 , G Schrieder  12 , H Simon  3 , J Stroth  20 , K Sümmerer  3 , O Tengblad  6 , H Weick  3 , C Wimmer  9 , M V Zhukov  13
Affiliations

First observation of the unbound nucleus 15Ne

F Wamers et al. Phys Rev Lett. .

Abstract

We report on the first observation of the unbound proton-rich nucleus 15Ne. Its ground state and first excited state were populated in two-neutron knockout reactions from a beam of 500 MeV/u 17Ne. The 15Ne ground state is found to be unbound by 2.522(66) MeV. The decay proceeds directly to 13O with simultaneous two-proton emission. No evidence for sequential decay via the energetically allowed 2- and 1- states in 14F is observed. The 15Ne ground state is shown to have a strong configuration with two protons in the (sd) shell around 13O with a 63(5)% (1s1/2)2 component.

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