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
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- PMID:24745409
- DOI: 10.1103/PhysRevLett.112.132502
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First observation of the unbound nucleus 15Ne
F Wamers et al. Phys Rev Lett..
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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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