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

Caesar, C.; Simonis, J.; Adachi, T.; Aksyutina, Y.; Alcantara, J.; Altstadt, S.; Alvarez-Pol, H.; Ashwood, N.; Aumann, T. and Avdeichikov, Vladimir LU , et al. (2013) In Physical Review C (Nuclear Physics) 88(3).
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... (More)
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. (Less)
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Physical Review C (Nuclear Physics)
volume
88
issue
3
publisher
American Physical Society
external identifiers
  • wos:000324397800002
  • scopus:84885117762
ISSN
0556-2813
DOI
10.1103/PhysRevC.88.034313
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English
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95fd4aa7-585e-49ed-af4a-984c5d7b1ba6 (old id 4106391)
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2013-11-13 13:11:26
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@article{95fd4aa7-585e-49ed-af4a-984c5d7b1ba6,
  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.},
  articleno    = {034313},
  author       = {Caesar, C. and Simonis, J. and Adachi, T. and Aksyutina, Y. and Alcantara, J. and Altstadt, S. and Alvarez-Pol, H. and Ashwood, N. and Aumann, T. and Avdeichikov, Vladimir and Barr, M. and Beceiro, S. and Bemmerer, D. and Benlliure, J. and Bertulani, C. A. and Boretzky, K. and Borge, M. J. G. and Burgunder, G. and Caamano, M. and Casarejos, E. and Catford, W. and Cederkäll, Joakim and Chakraborty, S. and Chartier, M. and Chulkov, L. and Cortina-Gil, D. and Pramanik, U. Datta and Fernandez, P. Diaz and Dillmann, I. and Elekes, Z. and Enders, J. and Ershova, O. and Estrade, A. and Farinon, F. and Fraile, L. M. and Freer, M. and Freudenberger, M. and Fynbo, H. O. U. and Galaviz, D. and Geissel, H. and Gernhaeuser, R. and Golubev, Pavel and Diaz, D. Gonzalez and Hagdahl, J. and Heftrich, T. and Heil, M. and Heine, M. and Heinz, A. and Henriques, A. and Holl, M. and Holt, J. D. and Ickert, G. and Ignatov, A. and Jakobsson, Bo and Johansson, H. T. and Jonson, B. and Kalantar-Nayestanaki, N. and Kanungo, R. and Kelic-Heil, A. and Knoebel, R. and Kroell, T. and Kruecken, R. and Kurcewicz, J. and Labiche, M. and Langer, C. and Le Bleis, T. and Lemmon, R. and Lepyoshkina, O. and Lindberg, S. and Machado, J. and Marganiec, J. and Maroussov, V. and Menendez, J. and Mostazo, M. and Movsesyan, A. and Najafi, A. and Nilsson, T. and Nociforo, C. and Panin, V. and Perea, A. and Pietri, S. and Plag, R. and Prochazka, A. and Rahaman, A. and Rastrepina, G. and Reifarth, R. and Ribeiro, G. and Ricciardi, M. V. and Rigollet, C. and Riisager, K. and Roeder, M. and Rossi, D. and del Rio, J. Sanchez and Savran, D. and Scheit, H. and Schwenk, A. and Simon, H. and Sorlin, O. and Stoica, V. and Streicher, B. and Taylor, J. and Tengblad, O. and Terashima, S. and Thies, R. and Togano, Y. and Uberseder, E. and Van de Walle, J. and Velho, P. and Volkov, V. and Wagner, A. and Wamers, F. and Weick, H. and Weigand, M. and Wheldon, C. and Wilson, G. and Wimmer, C. and Winfield, J. S. and Woods, P. and Yakorev, D. and Zhukov, M. V. and Zilges, A. and Zoric, M. and Zuber, K.},
  issn         = {0556-2813},
  language     = {eng},
  number       = {3},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {Beyond the neutron drip line: The unbound oxygen isotopes O-25 and O-26},
  url          = {http://dx.doi.org/10.1103/PhysRevC.88.034313},
  volume       = {88},
  year         = {2013},
}