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Level structure in the transitional nucleus 215Fr
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DOI：10.1103/PhysRevC.105.034307.png)
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摘要
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The level scheme of Fr-215 is extended up to 55/2 h and 4.8 MeV excitation energy with the addition of 52 new gamma-ray transitions. Previously established isomers and their half-lives, except for the 47/2(+) state, are revisited. The discrepancy in the half-life of the 39/2(-) state is resolved, and its half-life is revised to 11.4(14) ns. An overall good agreement is observed between the experimental results and the shell-model calculations performed using the CD-Bonn NN interaction derived from the Vlow-k renormalization approach. A weak coupling of the odd proton to the even-even core is observed to account for the level structure at lower energies, which strongly resembles a decoupled nonrotational band. A new positive-parity sequence is also established which is observed to originate from the coupling of the i(13/12) proton at low excitation energy.
Keyword:
HIGH-SPIN STATES
PROTON-NEUTRON INTERACTIONS
OCTUPOLE DEFORMATION
YRAST STATES
IN-BEAM
SPECTROSCOPY
RA-216
PARITY
SHAPES
CLOVER
期刊
IF:
3.4
论文数:
2.9W
被引数:
5.7W
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