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Beyond the neutron drip line: The unbound oxygen isotopes25O and26O

Physical Review C2013Vol. 88(3)

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C. Caesar, J. Simonis, T. Adachi, Yu. Aksyutina, Juan M. A. Alcántara, S. Altstadt, H. Álvarez-Pol, N. I. Ashwood, T. Aumann, V.V. Avdeichikov, M. Barr, S. Beceiro-Novo, D. Bemmerer, J. Benlliure, C. A. Bertulani, K. Boretzky, M. J. G. Borge, G. Burgunder, M. Caamaño, E. Casarejos, W. N. Catford, J. Cederkäll, S. Chakraborty, M. Chartier, L.V. Chulkov, D. Cortina‐Gil, U. Datta Pramanik, P. Díaz Fernández, I. Dillmann, Z. Elekes, J. Enders, O. Ershova, A. Estradé, F. Farinon, L. M. Fraile, M. Freer, M. Freudenberger, H. O. U. Fynbo, D. Galaviz, H. Geißel, R. Gernhäuser, P. Golubev, D. González-Díaz, J. Hagdahl, T. Heftrich, M. Heil, M. Heine, A. Heinz, Ana Margarida Henriques, M. Holl, J. D. Holt, G. Ickert, A. Ignatov, B. Jakobsson, H. Johansson, B. Jonson, N. Kalantar‐Nayestanaki, R. Kanungo, A. Kelić-Heil, R. Knöbel, T. Kröll, R. Krücken, J. Kurcewicz, M. Labiche, C. Langer, T. Le Bleis, R. C. Lemmon, O. Lepyoshkina, S. Lindberg, Jorge Machado, J. Marganiec, V. Maroussov, J. Menéndez, M. Mostazo, A. Movsesyan, A. Najafi, T. Nilsson, C. Nociforo, V. Panin, Á. Perea, S. Piétri, R. Plag, A. Procházka, A. Rahaman, G. Rastrepina, R. Reifarth, G. Ribeiro, M. V. Ricciardi, C. Rigollet, K. Riisager, M. Röder, D. Rossi, J. Sánchez del Río, D. Savran, H. Scheit, A. Schwenk, H. Simon, O. Sorlin, Victor Stoica, B. Štreicher, J. Taylor, O. Tengblad, S. Terashima, R. Thies, Y. Togano, E. Uberseder, J. Van de Walle, Paulo Eduardo Neves Ferreira Velho, V. Volkov, A. Wagner, F. Wamers, H. Weick, M. Weigand, C. Wheldon, G. L. Wilson, K. Wimmer, J. S. Winfield, P. J. Woods, D. Yakorev, M. V. Zhukov, A. Zilges, Marko Zorić, Κ. Zuber

Abstract

The very neutron-rich oxygen isotopes ${}^{25}$O and ${}^{26}$O 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 ${}^{26}$F and ${}^{27}$F at relativistic energies around 442 and 414 MeV/nucleon, respectively. From the kinematically complete measurement of the decay into ${}^{24}$O plus one or two neutrons, the ${}^{25}$O ground-state energy and width are determined, and upper limits for the ${}^{26}$O ground-state energy and lifetime are extracted. In addition, the results provide indications for an excited state in ${}^{26}$O 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.

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Abstract

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