Coulomb excitation of Na-29,Na-30: Mapping the borders of the island of inversion
M. Seidlitz
,
P. Reiter
,
R. Altenkirch
,
B. Bastin
,
C. Bauer
,
A. Blazhev
,
N. Bree
,
B. Bruyneel
,
P. A. Butler
,
J. Cederkall
,
T. Davinson
,
H. de Witte
,
D. D. Dijulio
,
J. Diriken
,
L. P. Gaffney
,
K. Geibel
,
G. Georgiev
(1)
,
R. Gernhauser
,
M. Huyse
,
N. Kesteloot
,
T. Kroll
,
R. Krucken
,
R. Lutter
,
J. Pakarinen
,
F. Radeck
,
M. Scheck
,
D. Schneiders
,
B. Siebeck
,
C. Sotty
(2)
,
T. Steinbach
,
J. Taprogge
,
P. van Duppen
,
J. V. de Walle
,
D. Voulot
,
N. Warr
,
F. Wenander
,
K. Wimmer
,
P. J. Woods
,
K. Wrzosek-Lipska
M. Seidlitz
- Function : Author
P. Reiter
- Function : Author
R. Altenkirch
- Function : Author
B. Bastin
- Function : Author
- PersonId : 738704
- IdHAL : beyhan-bastin
- ORCID : 0000-0001-5959-0875
- IdRef : 123532752
C. Bauer
- Function : Author
A. Blazhev
- Function : Author
N. Bree
- Function : Author
B. Bruyneel
- Function : Author
P. A. Butler
- Function : Author
J. Cederkall
- Function : Author
T. Davinson
- Function : Author
H. de Witte
- Function : Author
D. D. Dijulio
- Function : Author
J. Diriken
- Function : Author
L. P. Gaffney
- Function : Author
K. Geibel
- Function : Author
G. Georgiev
- Function : Author
- PersonId : 739360
- IdHAL : georgi-georgiev
- ORCID : 0000-0003-1467-1764
- IdRef : 16859188X
R. Gernhauser
- Function : Author
M. Huyse
- Function : Author
N. Kesteloot
- Function : Author
T. Kroll
- Function : Author
R. Krucken
- Function : Author
R. Lutter
- Function : Author
J. Pakarinen
- Function : Author
F. Radeck
- Function : Author
M. Scheck
- Function : Author
D. Schneiders
- Function : Author
B. Siebeck
- Function : Author
T. Steinbach
- Function : Author
J. Taprogge
- Function : Author
P. van Duppen
- Function : Author
J. V. de Walle
- Function : Author
D. Voulot
- Function : Author
N. Warr
- Function : Author
F. Wenander
- Function : Author
K. Wimmer
- Function : Author
- PersonId : 759292
- ORCID : 0000-0001-8178-0405
- IdRef : 185852203
P. J. Woods
- Function : Author
K. Wrzosek-Lipska
- Function : Author
Abstract
Nuclear shell evolution in neutron-rich Na nuclei around N = 20 was studied by determining reduced transition probabilities, i.e., B(E2) and B(M1) values, in order to map the border of the island of inversion. To this end Coulomb-excitation experiments, employing radioactive Na-29,Na-30 beams with a final beam energy of 2.85 MeV/nucleon, were performed at REX-ISOLDE, CERN. De-excitation gamma rays were detected by the MINIBALL gamma-ray spectrometer in coincidence with scattered particles in a segmented Si detector. Transition probabilities to excited states were deduced. The measured B(E2) values agree well with shell-model predictions, supporting the idea that in the Na isotopic chain the ground-state wave function contains significant intruder admixture already at N = 18, with N = 19 having an almost pure two-particle-two-hole deformed ground-state configuration.