Reflection asymmetry in the structure and spectroscopy of224Ac |
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Authors: | Raymond K Sheline C F Liang P Paris P Alexa J Kvasil |
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Institution: | (1) Chemistry and Physics Departments, Florida State University, 32306 Tallahassee, FL, U.S.A.;(2) CSNSM, IN2P3-CNRS, Bt. 104, F-91405 Campus-Orsay, France;(3) Department of Physics and Measurements, Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czech Republic;(4) Department of Nuclear Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00 Prague 8, Czech Republic |
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Abstract: | Minor changes in the assignments of gamma rays following the alpha decay of228Pa in two previous studies make possible a reinterpretation of224Ac into two alternative level schemes. The resulting level structures arise from the reflection asymmetric configurations
π3/2±(0.0 −0.3)−ν3/2±(−0.1 0.6), π5/2±(0.0 −0.2)±ν3/2±(−0.1 0.6) and π5/2±(0.0 −0.2)±ν1/2±(0.2 −0.1 3) which give rise to eitherK=0± or 1±,K=4±,K=2± andK=3± parity doublet bands. The bands with appreciable band structure, namelyK=0± or 1± andK=3±, have average parity doublet splittings of 11.0 and 5.8 keV respectively. These are extremely small values and suggest that224Ac is the most octupole deformed nucleus studied thus far. A method of calculating the parity doublet splitting in odd-odd
nuclei is suggested and tested for224Ac. It seems to work remarkably well. The systematics of the hindrance factors for the bands with extended band structures
confirm their interpretations as band structures. Finally, the two alternative level schemes are analyzed in the framework
of the axially-symmetric rigid rotor model including the Coriolis interaction. |
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Keywords: | PACS" target="_blank">PACS 21 60 Ev 21 60 Cs 23 60 +e 27 90 +b |
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