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
C. Caesar
- Function : Author
J. Simonis
- Function : Author
T. Adachi
- Function : Author
Y. Aksyutina
- Function : Author
J. Alcantara
- Function : Author
S. Altstadt
- Function : Author
H. Alvarez-Pol
- Function : Author
N. Ashwood
- Function : Author
T. Aumann
- Function : Author
V. Avdeichikov
- Function : Author
M. Barr
- Function : Author
S. Beceiro
- Function : Author
D. Bemmerer
- Function : Author
J. Benlliure
- Function : Author
C.A. Bertulani
- Function : Author
K. Boretzky
- Function : Author
M.J.G. Borge
- Function : Author
M. Caamano
- Function : Author
E. Casarejos
- Function : Author
W. Catford
- Function : Author
J. Cederkall
- Function : Author
S. Chakraborty
- Function : Author
M. Chartier
- Function : Author
L. Chulkov
- Function : Author
D. Cortina-Gil
- Function : Author
U. Datta Pramanik
- Function : Author
P. Diaz Fernandez
- Function : Author
I. Dillmann
- Function : Author
Z. Elekes
- Function : Author
- PersonId : 755406
- ORCID : 0000-0003-0571-8719
J. Enders
- Function : Author
O. Ershova
- Function : Author
A. Estrade
- Function : Author
F. Farinon
- Function : Author
L. M. Fraile
- Function : Author
M. Freer
- Function : Author
M. Freudenberger
- Function : Author
H.O U. Fynbo
- Function : Author
D. Galaviz
- Function : Author
H. Geissel
- Function : Author
R. Gernhauser
- Function : Author
P. Golubev
- Function : Author
D. Gonzalez Diaz
- Function : Author
J. Hagdahl
- Function : Author
T. Heftrich
- Function : Author
M. Heil
- Function : Author
A. Heinz
- Function : Author
A. Henriques
- Function : Author
M. Holl
- Function : Author
J.D. Holt
- Function : Author
G. Ickert
- Function : Author
A. Ignatov
- Function : Author
B. Jakobsson
- Function : Author
H.T. Johansson
- Function : Author
B. Jonson
- Function : Author
N. Kalantar-Nayestanaki
- Function : Author
R. Kanungo
- Function : Author
A. Kelic-Heil
- Function : Author
R. Knöbel
- Function : Author
T. Kröll
- Function : Author
R. Krucken
- Function : Author
J. Kurcewicz
- Function : Author
M. Labiche
- Function : Author
C. Langer
- Function : Author
T. Le Bleis
- Function : Author
R. Lemmon
- Function : Author
O. Lepyoshkina
- Function : Author
S. Lindberg
- Function : Author
J. Machado
- Function : Author
J. Marganiec
- Function : Author
V. Maroussov
- Function : Author
J. Menendez
- Function : Author
M. Mostazo
- Function : Author
A. Movsesyan
- Function : Author
A. Najafi
- Function : Author
T. Nilsson
- Function : Author
- PersonId : 755193
- ORCID : 0000-0001-9604-6377
C. Nociforo
- Function : Author
V. Panin
- Function : Author
A. Perea
- Function : Author
S. Pietri
- Function : Author
R. Plag
- Function : Author
A. Prochazka
- Function : Author
A. Rahaman
- Function : Author
G. Rastrepina
- Function : Author
R. Reifarth
- Function : Author
G. Ribeiro
- Function : Author
M. V. Ricciardi
- Function : Author
C. Rigollet
- Function : Author
K. Riisager
- Function : Author
M. Röder
- Function : Author
D. Rossi
- Function : Author
J. Sanchez del Rio
- Function : Author
D. Savran
- Function : Author
H. Scheit
- Function : Author
A. Schwenk
- Function : Author
H. Simon
- Function : Author
V. Stoica
- Function : Author
B. Streicher
- Function : Author
James Taylor
- Function : Author
- PersonId : 184137
- IdHAL : james-taylor
- ORCID : 0000-0001-9709-8689
O. Tengblad
- Function : Author
S. Terashima
- Function : Author
R. Thies
- Function : Author
Y. Togano
- Function : Author
E. Uberseder
- Function : Author
J. van de Walle
- Function : Author
P. Velho
- Function : Author
V. Volkov
- Function : Author
A. Wagner
- Function : Author
F. Wamers
- Function : Author
H. Weick
- Function : Author
M. Weigand
- Function : Author
C. Wheldon
- Function : Author
G. Wilson
- Function : Author
C. Wimmer
- Function : Author
J.S. Winfield
- Function : Author
P. Woods
- Function : Author
D. Yakorev
- Function : Author
M.V. Zhukov
- Function : Author
A. Zilges
- Function : Author
M. Zoric
- Function : Author
K. Zuber
- Function : Author
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.