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

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; Joakim Cederkäll; 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; Pavel 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; 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

doi:10.1103/PhysRevC.88.034313

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

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. CasarejosW. Catford, Joakim Cederkäll, 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, Pavel 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, 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

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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.

Original language	English
Article number	034313
Journal	Physical Review C (Nuclear Physics)
Volume	88
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.88.034313
Publication status	Published - 2013

Subject classification (UKÄ)

Subatomic Physics

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10.1103/PhysRevC.88.034313

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Caesar, C., Simonis, J., Adachi, T., Aksyutina, Y., Alcantara, J., Altstadt, S., Alvarez-Pol, H., Ashwood, N., Aumann, T., Avdeichikov, V., Barr, M., Beceiro, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Burgunder, G., Caamano, M., ... Zuber, K. (2013). Beyond the neutron drip line: The unbound oxygen isotopes O-25 and O-26. Physical Review C (Nuclear Physics), 88(3), Article 034313. https://doi.org/10.1103/PhysRevC.88.034313

@article{95fd4aa7585e49edaf4a984c5d7b1ba6,

title = "Beyond the neutron drip line: The unbound oxygen isotopes O-25 and O-26",

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.",

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

year = "2013",

doi = "10.1103/PhysRevC.88.034313",

language = "English",

volume = "88",

journal = "Physical Review C (Nuclear Physics)",

issn = "0556-2813",

publisher = "American Physical Society",

number = "3",

}

Caesar, C, Simonis, J, Adachi, T, Aksyutina, Y, Alcantara, J, Altstadt, S, Alvarez-Pol, H, Ashwood, N, Aumann, T, Avdeichikov, V, Barr, M, Beceiro, S, Bemmerer, D, Benlliure, J, Bertulani, CA, Boretzky, K, Borge, MJG, Burgunder, G, Caamano, M, Casarejos, E, Catford, W, Cederkäll, J, Chakraborty, S, Chartier, M, Chulkov, L, Cortina-Gil, D, Pramanik, UD, Fernandez, PD, Dillmann, I, Elekes, Z, Enders, J, Ershova, O, Estrade, A, Farinon, F, Fraile, LM, Freer, M, Freudenberger, M, Fynbo, HOU, Galaviz, D, Geissel, H, Gernhaeuser, R, Golubev, P, Diaz, DG, Hagdahl, J, Heftrich, T, Heil, M, Heine, M, Heinz, A, Henriques, A, Holl, M, Holt, JD, Ickert, G, Ignatov, A, Jakobsson, B, Johansson, HT, Jonson, B, Kalantar-Nayestanaki, N, Kanungo, R, Kelic-Heil, A, Knoebel, R, Kroell, T, Kruecken, R, Kurcewicz, J, Labiche, M, Langer, C, Le Bleis, T, Lemmon, R, Lepyoshkina, O, Lindberg, S, Machado, J, Marganiec, J, Maroussov, V, Menendez, J, Mostazo, M, Movsesyan, A, Najafi, A, Nilsson, T, Nociforo, C, Panin, V, Perea, A, Pietri, S, Plag, R, Prochazka, A, Rahaman, A, Rastrepina, G, Reifarth, R, Ribeiro, G, Ricciardi, MV, Rigollet, C, Riisager, K, Roeder, M, Rossi, D, del Rio, JS, Savran, D, Scheit, H, Schwenk, A, Simon, H, Sorlin, O, Stoica, V, Streicher, B, Taylor, J, Tengblad, O, Terashima, S, Thies, R, Togano, Y, Uberseder, E, Van de Walle, J, Velho, P, Volkov, V, Wagner, A, Wamers, F, Weick, H, Weigand, M, Wheldon, C, Wilson, G, Wimmer, C, Winfield, JS, Woods, P, Yakorev, D, Zhukov, MV, Zilges, A, Zoric, M & Zuber, K 2013, 'Beyond the neutron drip line: The unbound oxygen isotopes O-25 and O-26', Physical Review C (Nuclear Physics), vol. 88, no. 3, 034313. https://doi.org/10.1103/PhysRevC.88.034313

TY - JOUR

T1 - Beyond the neutron drip line: The unbound oxygen isotopes O-25 and O-26

AU - Caesar, C.

AU - Simonis, J.

AU - Adachi, T.

AU - Aksyutina, Y.

AU - Alcantara, J.

AU - Altstadt, S.

AU - Alvarez-Pol, H.

AU - Ashwood, N.

AU - Aumann, T.

AU - Avdeichikov, Vladimir

AU - Barr, M.

AU - Beceiro, S.

AU - Bemmerer, D.

AU - Benlliure, J.

AU - Bertulani, C. A.

AU - Boretzky, K.

AU - Borge, M. J. G.

AU - Burgunder, G.

AU - Caamano, M.

AU - Casarejos, E.

AU - Catford, W.

AU - Cederkäll, Joakim

AU - Chakraborty, S.

AU - Chartier, M.

AU - Chulkov, L.

AU - Cortina-Gil, D.

AU - Pramanik, U. Datta

AU - Fernandez, P. Diaz

AU - Dillmann, I.

AU - Elekes, Z.

AU - Enders, J.

AU - Ershova, O.

AU - Estrade, A.

AU - Farinon, F.

AU - Fraile, L. M.

AU - Freer, M.

AU - Freudenberger, M.

AU - Fynbo, H. O. U.

AU - Galaviz, D.

AU - Geissel, H.

AU - Gernhaeuser, R.

AU - Golubev, Pavel

AU - Diaz, D. Gonzalez

AU - Hagdahl, J.

AU - Heftrich, T.

AU - Heil, M.

AU - Heine, M.

AU - Heinz, A.

AU - Henriques, A.

AU - Holl, M.

AU - Holt, J. D.

AU - Ickert, G.

AU - Ignatov, A.

AU - Jakobsson, Bo

AU - Johansson, H. T.

AU - Jonson, B.

AU - Kalantar-Nayestanaki, N.

AU - Kanungo, R.

AU - Kelic-Heil, A.

AU - Knoebel, R.

AU - Kroell, T.

AU - Kruecken, R.

AU - Kurcewicz, J.

AU - Labiche, M.

AU - Langer, C.

AU - Le Bleis, T.

AU - Lemmon, R.

AU - Lepyoshkina, O.

AU - Lindberg, S.

AU - Machado, J.

AU - Marganiec, J.

AU - Maroussov, V.

AU - Menendez, J.

AU - Mostazo, M.

AU - Movsesyan, A.

AU - Najafi, A.

AU - Nilsson, T.

AU - Nociforo, C.

AU - Panin, V.

AU - Perea, A.

AU - Pietri, S.

AU - Plag, R.

AU - Prochazka, A.

AU - Rahaman, A.

AU - Rastrepina, G.

AU - Reifarth, R.

AU - Ribeiro, G.

AU - Ricciardi, M. V.

AU - Rigollet, C.

AU - Riisager, K.

AU - Roeder, M.

AU - Rossi, D.

AU - del Rio, J. Sanchez

AU - Savran, D.

AU - Scheit, H.

AU - Schwenk, A.

AU - Simon, H.

AU - Sorlin, O.

AU - Stoica, V.

AU - Streicher, B.

AU - Taylor, J.

AU - Tengblad, O.

AU - Terashima, S.

AU - Thies, R.

AU - Togano, Y.

AU - Uberseder, E.

AU - Van de Walle, J.

AU - Velho, P.

AU - Volkov, V.

AU - Wagner, A.

AU - Wamers, F.

AU - Weick, H.

AU - Weigand, M.

AU - Wheldon, C.

AU - Wilson, G.

AU - Wimmer, C.

AU - Winfield, J. S.

AU - Woods, P.

AU - Yakorev, D.

AU - Zhukov, M. V.

AU - Zilges, A.

AU - Zoric, M.

AU - Zuber, K.

PY - 2013

Y1 - 2013

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevC.88.034313

DO - 10.1103/PhysRevC.88.034313

M3 - Article

SN - 0556-2813

VL - 88

JO - Physical Review C (Nuclear Physics)

JF - Physical Review C (Nuclear Physics)

IS - 3

M1 - 034313

ER -

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

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