Journal articles
Direct Evidence of Octupole Deformation in Neutron-Rich Ba-144
B. Bucher
S. Zhu
Y. Wu C.
F. Janssens R. V.
D. Cline
B. Hayes A.
M. Albers
D. Ayangeakaa A.
A. Butler P.
M. Campbell C.
P. Carpenter M.
J. Chiara C.
A. Clark J.
L. Crawford H.
M. Cromaz
M. David H.
C. Dickerson
T. Gregor E.
J. Harker
R. Hoffman C.
P. Kay B.
G. Kondev F.
A. Korichi
1
T. Lauritsen
O. Macchiavelli A.
C. Pardo R.
A. Richard
A. Riley, M.
G. Savard
M. Scheck
D. Seweryniak
K. Smith M.
R. Vondrasek
A. Wiens
R. Vondrasek
Author
A. Wiens
Author
1
CSNSM SNO - Centre de Sciences Nucléaires et de Sciences de la Matière ( Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay - France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- Université Paris-Saclay (Espace Technologique, Bat. Discovery - RD 128 - 2e ét., 91190 Saint-Aubin - France)
- Univ. Paris-Sud (Univ. Paris-Sud, 91405 Orsay - France)
Abstract : The neutron-rich nucleus Ba-144 (t(1/2) = 11.5 s) is expected to exhibit some of the strongest octupole correlations among nuclei with mass numbers A less than 200. Until now, indirect evidence for such strong correlations has been inferred from observations such as enhanced E1 transitions and interleaving positive- and negative-parity levels in the ground-state band. In this experiment, the octupole strength was measured directly by sub-barrier, multistep Coulomb excitation of a post-accelerated 650-MeV Ba-144 beam on a 1.0-mg/cm(2) Pb-208 target. The measured value of the matrix element, < 3(1)(-)parallel to M(E3)parallel to 0(1)(+)> = 0.65((+17)(-23)) eb(3/2,) corresponds to a reduced Bd(E3) transition probability of 48((+25)(-34)) W.u. This result represents an unambiguous determination of the octupole collectivity, is larger than any available theoretical prediction, and is consistent with octupole deformation.
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Journal articles
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http://hal.in2p3.fr/in2p3-01303476
Contributor : Emilie Bonnardel <>
Submitted on : Monday, April 18, 2016 - 11:27:48 AM
Last modification on : Monday, February 10, 2020 - 6:14:09 PM
Contributor : Emilie Bonnardel <>
Submitted on : Monday, April 18, 2016 - 11:27:48 AM
Last modification on : Monday, February 10, 2020 - 6:14:09 PM
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- HAL Id : in2p3-01303476, version 1
- DOI : 10.1103/PhysRevLett.116.112503
Citation
B. Bucher, S. Zhu, Y. Wu C., F. Janssens R. V., D. Cline, et al.. Direct Evidence of Octupole Deformation in Neutron-Rich Ba-144. Physical Review Letters, American Physical Society, 2016, 116 (issue 11), pp.112503. ⟨10.1103/PhysRevLett.116.112503⟩. ⟨in2p3-01303476⟩
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