Multiple octupole-type band structures in $^{220}\mathrm{Th}$: Reflection-asymmetric tidal waves?

Multiple octupole-type band structures in ${}^{220}{Th}$ : Reflection-asymmetric tidal waves?

W. Reviol, C. J. Chiara, M. Montero, D. G. Sarantites, O. L. Pechenaya, M. P. Carpenter, R. V. F. Janssens, T. L. Khoo, T. Lauritsen, C. J. Lister, D. Seweryniak, S. Zhu, and S. G. Frauendorf

Phys. Rev. C 74, 044305 – Published 12 October 2006

Abstract

The ${}^{220}{Th}$ level scheme has been considerably extended from an experiment using the ${}^{26}{Mg} + {}^{198}{Pt}$ reaction at 128 MeV. The evaporation residues from this very fissile system were selected with the HERCULES detector system and residue-gated $γ$ rays were measured with Gammasphere. The simplex feature (alternating-parity levels) persists up to the highest spins observed ( $23 ℏ$ ), 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 $B (E 1) / B (E 2)$ ratios. A new interpretation based on a picture of tidal waves on a reflection-asymmetric nuclear surface is proposed.

Received 23 August 2006

DOI:https://doi.org/10.1103/PhysRevC.74.044305

Authors & Affiliations

W. Reviol¹, C. J. Chiara¹, M. Montero¹, D. G. Sarantites¹, O. L. Pechenaya², M. P. Carpenter³, R. V. F. Janssens³, T. L. Khoo³, T. Lauritsen³, C. J. Lister³, D. Seweryniak³, S. Zhu³, and S. G. Frauendorf⁴

¹Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA
²Department of Physics, Washington University, St. Louis, Missouri 63130, USA
³Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
⁴Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA

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Vol. 74, Iss. 4 — October 2006

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Physical Review C

covering nuclear physics

Multiple octupole-type band structures in ${}^{220}{Th}$ : Reflection-asymmetric tidal waves?

W. Reviol, C. J. Chiara, M. Montero, D. G. Sarantites, O. L. Pechenaya, M. P. Carpenter, R. V. F. Janssens, T. L. Khoo, T. Lauritsen, C. J. Lister, D. Seweryniak, S. Zhu, and S. G. Frauendorf

Phys. Rev. C 74, 044305 – Published 12 October 2006

Abstract

Authors & Affiliations

Article Text (Subscription Required)

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Physical Review C

covering nuclear physics

Multiple octupole-type band structures in Th220: Reflection-asymmetric tidal waves?

W. Reviol, C. J. Chiara, M. Montero, D. G. Sarantites, O. L. Pechenaya, M. P. Carpenter, R. V. F. Janssens, T. L. Khoo, T. Lauritsen, C. J. Lister, D. Seweryniak, S. Zhu, and S. G. Frauendorf

Phys. Rev. C 74, 044305 – Published 12 October 2006

Abstract

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Multiple octupole-type band structures in ${}^{220}{Th}$ : Reflection-asymmetric tidal waves?