A study of γ decays and octupole bands in 21Ne and 21Na

Authors :: C. A. Ur
S. Lunardi
Th. Kröll
P. G. Bizzeti
H. G. Bohlen
D. Bazzacco
G. de Angelis
A. M. Bizzeti-Sona
S. M. Lenzi
Tz. Kokalova
R. Menegazzo
D. R. Napoli
W. von Oertzen
M. De Poli
B. Gebauer
A. Gadea
C. Rossi Alvarez
Aurora Tumino
N. Marginean
T. N. Massey
S. Thummerer
M. Axiotis
Source :: Physics of Atomic Nuclei. 66:1428-1433
Publication Year :: 2003
Publisher :: Pleiades Publishing Ltd, 2003.
Abstract: The reactions 16O(7Li, 2n) and 16O(7Li, np) populating 21Na and 21Ne have been studied at E L=27 MeV using the GASP γ-detector array. The level schemes for 21Na and 21Ne have been extended to higher spin. The population of the bands with K=3/2 and 1/2, forming parity doublets, are compared. Preferential E1 decay between bands of opposite parity is observed in agreement with the octupole scenario. The structure of these bands can be interpreted as consisting of an instrinsic asymmetric (4He + 16O) structure with octupole deformation.