Stabilization of Nuclear Isovector Valence-Shell Excitations - INSPIRE

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Stabilization of Nuclear Isovector Valence-Shell Excitations

G. Rainovski
(
- SUNY, Stony Brook and
- Sofiya U.
)
,
N. Pietralla
(
- SUNY, Stony Brook and
- Cologne U.
)
,
T. Ahn
(
- SUNY, Stony Brook
)
,
C.J. Lister
(
- Argonne
)
,
R.V.F. Janssens
(
- Argonne
)

Mar 31, 2006

4 pages

Published in:

Phys.Rev.Lett. 96 (2006) 122501

DOI:

10.1103/PhysRevLett.96.122501

View in:

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Abstract: (APS)

Excited states in Ce138 have been studied via the C12(Ce138,Ce*138) Coulomb excitation reaction at 480 MeV. Relative cross sections have been determined from the γ-ray yields observed with Gammasphere. The E2 and M1 strength distributions between the lowest six 2+ states up to 2.7 MeV enables us to identify the 24+ state in Ce138 as the dominant fragment of the one-phonon 21,ms+ mixed-symmetry state. Mixing between this level and a nearby isoscalar state is observed and is more than 4 times larger than in the neighboring isotone Ba136. This is direct evidence that the stability of mixed-symmetry states strongly depends on the underlying subshell structure.

27.60.+j
25.70.De
21.10.Re
23.20.Js

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Figures(0)

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