Multiple octupole-type band structures in {sup 220}Th: Reflection-asymmetric tidal waves?
- Department of Chemistry, Washington University, St. Louis, Missouri 63130 (United States)
- Department of Physics, Washington University, St. Louis, Missouri 63130 (United States)
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)
The {sup 220}Th level scheme has been considerably extended from an experiment using the {sup 26}Mg+{sup 198}Pt reaction at 128 MeV. The evaporation residues from this very fissile system were selected with the HERCULES detector system and residue-gated {gamma} rays were measured with Gammasphere. The simplex feature (alternating-parity levels) persists up to the highest spins observed (23({Dirac_h}/2{pi})), but the nucleus exhibits a more vibrational-like behavior than the heavier Th isotopes. In addition, a doubling of the negative-parity, odd-spin states is seen as well as a staggering of the B(E1)/B(E2) ratios. A new interpretation based on a picture of tidal waves on a reflection-asymmetric nuclear surface is proposed.
- OSTI ID:
- 20863848
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 74, Issue 4; Other Information: DOI: 10.1103/PhysRevC.74.044305; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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