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Beyond the neutron drip line: The unbound oxygen isotopes $^{25}$O and $^{26}$O

C. Caesar J. Simonis T. Adachi Y. Aksyutina J. Alcantara S. Altstadt H. Alvarez-Pol N. Ashwood T. Aumann V. Avdeichikov M. Barr S. Beceiro D. Bemmerer J. Benlliure C.A. Bertulani K. Boretzky M.J.G. Borge G. Burgunder 1 M. Caamano E. Casarejos W. Catford J. Cederkall 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. Gernhauser P. Golubev D. Gonzalez Diaz J. Hagdahl T. Heftrich M. Heil M. Heine A. Heinz A. Henriques M. Holl J.D. Holt G. Ickert A. Ignatov B. Jakobsson H.T. Johansson B. Jonson N. Kalantar-Nayestanaki R. Kanungo A. Kelic-Heil R. Knöbel T. Kröll R. Krucken 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. Röder D. Rossi J. Sanchez del Rio D. Savran H. Scheit A. Schwenk H. Simon O. Sorlin 1 V. Stoica B. Streicher James 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
Abstract : The very neutron-rich oxygen isotopes 25O and 26O 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 26F and 27F at relativistic energies around 442 and 414 MeV/nucleon, respectively. From the kinematically complete measurement of the decay into 24O plus one or two neutrons, the 25O ground-state energy and width are determined, and upper limits for the 26O ground-state energy and lifetime are extracted. In addition, the results provide indications for an excited state in 26O at around 4MeV. 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.
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Submitted on : Tuesday, September 17, 2013 - 1:53:09 PM
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C. Caesar, J. Simonis, T. Adachi, Y. Aksyutina, J. Alcantara, et al.. Beyond the neutron drip line: The unbound oxygen isotopes $^{25}$O and $^{26}$O. Physical Review C, American Physical Society, 2013, 88, pp.034313. ⟨10.1103/PhysRevC.88.034313⟩. ⟨in2p3-00862732⟩

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