First observation of the unbound nucleus Ne 15

  • F. Wamers
  • , J. Marganiec
  • , 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. Heil
  • D. H.H. 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, C. Wimmer, M. V. Zhukov

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31 Scopus citations

Abstract

We report on the first observation of the unbound proton-rich nucleus Ne15. Its ground state and first excited state were populated in two-neutron knockout reactions from a beam of 500 MeV/u Ne17. The Ne15 ground state is found to be unbound by 2.522(66) MeV. The decay proceeds directly to O13 with simultaneous two-proton emission. No evidence for sequential decay via the energetically allowed 2- and 1- states in F14 is observed. The Ne15 ground state is shown to have a strong configuration with two protons in the (sd) shell around O13 with a 63(5)% (1s1/2)2 component.

Original languageEnglish
Article number132502
JournalPhysical Review Letters
Volume112
Issue number13
DOIs
StatePublished - 4 Apr 2014
Externally publishedYes

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