Beyond the neutron drip line: The unbound oxygen isotopes O-25 and O-26

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Abstract

The very neutron-rich oxygen isotopes O-25 and O-26 are investigated experimentally and theoretically. The unbound states are populated in an experiment performed at the R3B-LAND setup at GSI via proton-knockout reactions from F-26 and F-27 at relativistic energies around 442 and 414 MeV/nucleon, respectively. From the kinematically complete measurement of the decay into O-24 plus one or two neutrons, the O-25 ground-state energy and width are determined, and upper limits for the O-26 ground-state energy and lifetime are extracted. In addition, the results provide indications for an excited state in O-26 at around 4 MeV. The experimental findings are compared to theoretical shell-model calculations based on chiral two- and three-nucleon (3N) forces, including for the first time residual 3N forces, which are shown to be amplified as valence neutrons are added.

Details

Authors
  • C. Caesar
  • J. Simonis
  • T. Adachi
  • Y. Aksyutina
  • J. Alcantara
  • S. Altstadt
  • H. Alvarez-Pol
  • N. Ashwood
  • T. Aumann
  • Vladimir Avdeichikov
  • M. Barr
  • S. Beceiro
  • D. Bemmerer
  • J. Benlliure
  • C. A. Bertulani
  • K. Boretzky
  • M. J. G. Borge
  • G. Burgunder
  • M. Caamano
  • E. Casarejos
  • W. Catford
  • S. Chakraborty
  • M. Chartier
  • L. Chulkov
  • D. Cortina-Gil
  • U. Datta Pramanik
  • P. Diaz Fernandez
  • I. Dillmann
  • Z. Elekes
  • J. Enders
  • O. Ershova
  • A. Estrade
  • F. Farinon
  • L. M. Fraile
  • M. Freer
  • M. Freudenberger
  • H. O. U. Fynbo
  • D. Galaviz
  • H. Geissel
  • R. Gernhaeuser
  • D. Gonzalez Diaz
  • J. Hagdahl
  • T. Heftrich
  • M. Heil
  • M. Heine
  • A. Heinz
  • A. Henriques
  • M. Holl
  • J. D. Holt
  • G. Ickert
  • A. Ignatov
  • Bo Jakobsson
  • H. T. Johansson
  • B. Jonson
  • N. Kalantar-Nayestanaki
  • R. Kanungo
  • A. Kelic-Heil
  • R. Knoebel
  • T. Kroell
  • R. Kruecken
  • J. Kurcewicz
  • M. Labiche
  • C. Langer
  • T. Le Bleis
  • R. Lemmon
  • O. Lepyoshkina
  • S. Lindberg
  • J. Machado
  • J. Marganiec
  • V. Maroussov
  • J. Menendez
  • M. Mostazo
  • A. Movsesyan
  • A. Najafi
  • T. Nilsson
  • C. Nociforo
  • V. Panin
  • A. Perea
  • S. Pietri
  • R. Plag
  • A. Prochazka
  • A. Rahaman
  • G. Rastrepina
  • R. Reifarth
  • G. Ribeiro
  • M. V. Ricciardi
  • C. Rigollet
  • K. Riisager
  • M. Roeder
  • D. Rossi
  • J. Sanchez del Rio
  • D. Savran
  • H. Scheit
  • A. Schwenk
  • H. Simon
  • O. Sorlin
  • V. Stoica
  • B. Streicher
  • J. Taylor
  • O. Tengblad
  • S. Terashima
  • R. Thies
  • Y. Togano
  • E. Uberseder
  • J. Van de Walle
  • P. Velho
  • V. Volkov
  • A. Wagner
  • F. Wamers
  • H. Weick
  • M. Weigand
  • C. Wheldon
  • G. Wilson
  • C. Wimmer
  • J. S. Winfield
  • P. Woods
  • D. Yakorev
  • M. V. Zhukov
  • A. Zilges
  • M. Zoric
  • K. Zuber
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Article number034313
JournalPhysical Review C (Nuclear Physics)
Volume88
Issue number3
Publication statusPublished - 2013
Publication categoryResearch
Peer-reviewedYes