Beyond the Neutron Drip-Line: The Unbound Oxygen Isotopes 25O and 26O
Creators: name: Caesar, C.
name: Simonis, J.
name: Adachi, T.
name: Aksyutina, Y.
name: Alcantara, J.
name: Altstadt, S.
name: Alvarez-Pol, H.
name: Ashwood, N.
name: Aumann, T.
name: Avdeichikov, V.
name: Barr, M.
name: Beceiro, S.
name: Bemmerer, D.
name: Benlliure, J.
name: Bertulani, C. A.
name: Boretzky, K.
name: Borge, M. J. G.
name: Burgunder, G.
name: Caamano, M.
name: Casarejos, E.
name: Catford, W.
name: Cederkäll, J.
name: Chakraborty, S.
name: Chartier, M.
name: Chulkov, L.
name: Cortina-Gil, D.
name: Pramanik, U. Datta
name: Fernandez, P. Diaz
name: Dillmann, I.
name: Elekes, Z.
name: Enders, J.
name: Ershova, O.
name: Estrade, A.
name: Farinon, F.
name: Fraile, L. M.
name: Freer, M.
name: Freudenberger, M.
name: Fynbo, H. O. U.
name: Galaviz, D.
name: Geissel, H.
name: Gernhäuser, R.
name: Golubev, P.
name: Diaz, D. Gonzalez
name: Hagdahl, J.
name: Heftrich, T.
name: Heil, M.
name: Heine, M.
name: Heinz, A.
name: Henriques, A.
name: Holl, M.
name: Holt, J. D.
name: Ickert, G.
name: Ignatov, A.
name: Jakobsson, B.
name: Johansson, H. T.
name: Jonson, B.
name: Kalantar-Nayestanaki, N.
name: Kanungo, R.
name: Kelic-Heil, A.
name: Knöbel, R.
name: Kröll, T.
name: Krücken, R.
name: Kurcewicz, J.
name: Labiche, M.
name: Langer, C.
name: Bleis, T. Le
name: Lemmon, R.
name: Lepyoshkina, O.
name: Lindberg, S.
name: Machado, J.
name: Marganiec, J.
name: Maroussov, V.
name: Menéndez, J.
name: Mostazo, M.
name: Movsesyan, A.
name: Najafi, A.
name: Nilsson, T.
name: Nociforo, C.
name: Panin, V.
name: Perea, A.
name: Pietri, S.
name: Plag, R.
name: Prochazka, A.
name: Rahaman, A.
name: Rastrepina, G.
name: Reifarth, R.
name: Ribeiro, G.
name: Ricciardi, M. V.
name: Rigollet, C.
name: Riisager, K.
name: Röder, M.
name: Rossi, D. M.
name: del Rio, J. Sanchez
name: Savran, D.
name: Scheit, H.
name: Schwenk, A.
name: Simon, H.
name: Sorlin, O.
name: Stoica, V.
name: Streicher, B.
name: Taylor, J.
name: Tengblad, O.
name: Terashima, S.
name: Thies, R.
name: Togano, Y.
name: Uberseder, E.
name: Van de Walle, J.
name: Velho, P.
name: Volkov, V.
name: Wagner, A.
name: Wamers, F.
name: Weick, H.
name: Weigand, M.
name: Wheldon, C.
name: Wilson, G.
name: Wimmer, C.
name: Winfield, J. S.
name: Woods, P.
name: Yakorev, D.
name: Zhukov, M. V.
name: Zilges, A.
name: Zoric, M.
name: Zuber, K.
name: collaboration, R3B
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The very neutron-rich oxygen isotopes 25O and 26O are investigated experimentally and theoret- ically. In this first R3B-LAND experiment, the unbound states are populated at GSI via proton- knockout reactions from 26F and 27F at relativistic energies around 450 MeV/nucleon. From the kinematically complete measurement of the decay into 24O plus one or two neutrons, the 25O ground- state energy and lifetime are determined, and upper limits for the 26O ground state are extracted. In addition, the results provide evidence for an excited state in 26O at around 4 MeV. The ex- perimental 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.