Coulomb excitation of Na-29,Na-30: Mapping the borders of the island of inversion
Seidlitz, M., Reiter, P., Altenkirch, R., Bastin, B., Bauer, C., Blazhev, A., . . . Wrzosek-Lipska, K. (2014). Coulomb excitation of Na-29,Na-30: Mapping the borders of the island of inversion. Physical Review C, 89 (2), 024309. doi:10.1103/PhysRevC.89.024309
Published in
Physical Review CDate
2014Discipline
FysiikkaCopyright
©2014 American Physical Society. This is an article whose final and definitive form has been published by American Physical Society.
Abstract: Nuclear shell evolution in neutron-rich Na nuclei around
N
=
20 was studied by determining reduced
transition probabilities, i.e.,
B
(
E
2) and
B
(
M
1) values, in order to map the border of the island of inversion.
To this end Coulomb-excitation experiments, employing radioactive
29
,
30
Na beams with a final beam energy of
2.85 MeV
/
nucleon, were performed at REX-ISOLDE, CERN. De-excitation
γ
rays were detected by the
MINIBALL
γ
-ray spectrometer in coincidence with scattered particles in a segmented Si detector. Transition
probabilities to excited states were deduced. The measured
B
(
E
2) 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.
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American Physical SocietyISSN Search the Publication Forum
0556-2813Keywords