Structure of low-lying states in 140Sm studied by Coulomb excitation
Klintefjord, M., Hadyńska-Klȩk, K., Görgen, A., Bauer, C., Garrote, F. L. B., Bönig, S., Bounthong, B., Damyanova, A., Delaroche, J.-P., Fedosseev, V., Fink, D. A., Giacoppo, F., Girod, M., Hoff, P., Imai, N., Korten, W., Larsen, A.-C., Libert, J., Lutter, R., . . . Zielińska, M. (2016). Structure of low-lying states in 140Sm studied by Coulomb excitation. Physical Review C, 93(5), Article 054303. https://doi.org/10.1103/PhysRevC.93.054303
Julkaistu sarjassa
Physical Review CPäivämäärä
2016Tekijänoikeudet
© the Authors, 2016. Published by the American Physical Society under the terms of the
Creative Commons Attribution 3.0 License.
The electromagnetic structure of 140Sm was studied in a low-energy Coulomb excitation experiment with
a radioactive ion beam from the REX-ISOLDE facility at CERN. The 2+ and 4+ states of the ground-state
band and a second 2+ state were populated by multistep excitation. The analysis of the differential Coulomb
excitation cross sections yielded reduced transition probabilities between all observed states and the spectroscopic
quadrupole moment for the 2+
1 state. The experimental results are compared to large-scale shell model calculations
and beyond-mean-field calculations based on the Gogny D1S interaction with a five-dimensional collective
Hamiltonian formalism. Simpler geometric and algebraic models are also employed to interpret the experimental
data. The results indicate that 140Sm shows considerable γ softness, but in contrast to earlier speculation no
signs of shape coexistence at low excitation energy. This work sheds more light on the onset of deformation and
collectivity in this mass region.
...
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