期刊
PHYSICAL REVIEW LETTERS
卷 116, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.112503
关键词
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资金
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC02-06CH11357, DE-AC02-05CH11231, DE-AC52-07NA27344]
- DOE [DE-FG02-94ER40834]
- National Science Foundation [PHY-01401574, PHY-1068192]
- STFC (UK) [ST/L005808/1]
- Science and Technology Facilities Council [ST/J000094/1, ST/L005670/1, ST/J000183/2, ST/L005808/1, ST/L005689/1] Funding Source: researchfish
- STFC [ST/L005689/1, ST/L005670/1, ST/J000094/1, ST/L005808/1, ST/J000183/2] Funding Source: UKRI
- U.S. Department of Energy (DOE) [DE-FG02-94ER40834] Funding Source: U.S. Department of Energy (DOE)
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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