Stabilization of nuclear isovector valence-shell excitations

N. Pietralla; T. Ahn; S. Zhu; C.J. Barton III; G. Rainovski; C.J. Lister; R.V.F. Janssens; M.P. Carpenter

doi:10.1103/PhysRevLett.96.122501

Stabilization of nuclear isovector valence-shell excitations

N. Pietralla, T. Ahn, S. Zhu, C.J. Barton III, G. Rainovski, C.J. Lister, R.V.F. Janssens, M.P. Carpenter

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Excited states in Ce-138 have been studied via the C-12(Ce-138,Ce-138(*)) Coulomb excitation reaction at 480 MeV. Relative cross sections have been determined from the gamma-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 2(4)(+) state in Ce-138 as the dominant fragment of the one-phonon 2(1,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 Ba-136. This is direct evidence that the stability of mixed-symmetry states strongly depends on the underlying subshell structure.

Original language	English
Article number	122501
Pages (from-to)	-
Number of pages	4
Journal	Physical Review Letters
Volume	96
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.96.122501
Publication status	Published - 31 Mar 2006

Keywords

MIXED-SYMMETRY STATES
TRANSITION-PROBABILITY
CE-138
MODE
SPECTROSCOPY
SCATTERING
CLUSTERS
BA-134

Access to Document

10.1103/PhysRevLett.96.122501

http://dx.doi.org/10.1103/PhysRevLett.96.122501

Cite this

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title = "Stabilization of nuclear isovector valence-shell excitations",

abstract = "Excited states in Ce-138 have been studied via the C-12(Ce-138,Ce-138(*)) Coulomb excitation reaction at 480 MeV. Relative cross sections have been determined from the gamma-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 2(4)(+) state in Ce-138 as the dominant fragment of the one-phonon 2(1,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 Ba-136. This is direct evidence that the stability of mixed-symmetry states strongly depends on the underlying subshell structure.",

keywords = "MIXED-SYMMETRY STATES, TRANSITION-PROBABILITY, CE-138, MODE, SPECTROSCOPY, SCATTERING, CLUSTERS, BA-134",

author = "N. Pietralla and T. Ahn and S. Zhu and {Barton III}, C.J. and G. Rainovski and C.J. Lister and R.V.F. Janssens and M.P. Carpenter",

year = "2006",

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doi = "10.1103/PhysRevLett.96.122501",

language = "English",

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journal = "Physical Review Letters",

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T1 - Stabilization of nuclear isovector valence-shell excitations

AU - Pietralla, N.

AU - Ahn, T.

AU - Zhu, S.

AU - Barton III, C.J.

AU - Rainovski, G.

AU - Lister, C.J.

AU - Janssens, R.V.F.

AU - Carpenter, M.P.

PY - 2006/3/31

Y1 - 2006/3/31

N2 - Excited states in Ce-138 have been studied via the C-12(Ce-138,Ce-138(*)) Coulomb excitation reaction at 480 MeV. Relative cross sections have been determined from the gamma-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 2(4)(+) state in Ce-138 as the dominant fragment of the one-phonon 2(1,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 Ba-136. This is direct evidence that the stability of mixed-symmetry states strongly depends on the underlying subshell structure.

AB - Excited states in Ce-138 have been studied via the C-12(Ce-138,Ce-138(*)) Coulomb excitation reaction at 480 MeV. Relative cross sections have been determined from the gamma-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 2(4)(+) state in Ce-138 as the dominant fragment of the one-phonon 2(1,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 Ba-136. This is direct evidence that the stability of mixed-symmetry states strongly depends on the underlying subshell structure.

KW - MIXED-SYMMETRY STATES

KW - TRANSITION-PROBABILITY

KW - CE-138

KW - MODE

KW - SPECTROSCOPY

KW - SCATTERING

KW - CLUSTERS

KW - BA-134

U2 - 10.1103/PhysRevLett.96.122501

DO - 10.1103/PhysRevLett.96.122501

M3 - Article

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SP - -

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

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