Structure of $^{240}\mathrm{Pu}$: Evidence for Octupole Phonon Condensation?

Structure of ${}^{240}{Pu}$ : Evidence for Octupole Phonon Condensation?

X. Wang, R. V. F. Janssens, M. P. Carpenter, S. Zhu, I. Wiedenhöver, U. Garg, S. Frauendorf, T. Nakatsukasa, I. Ahmad, A. Bernstein, E. Diffenderfer, S. J. Freeman, J. P. Greene, T. L. Khoo, F. G. Kondev, A. Larabee, T. Lauritsen, C. J. Lister, B. Meredith, D. Seweryniak, C. Teal, and P. Wilson

Phys. Rev. Lett. 102, 122501 – Published 23 March 2009

Abstract

The expanded level structure of ${}^{240}{Pu}$ available from the present study highlights the role of strong octupole correlations in this nucleus. In addition to a delayed alignment in the yrast band, the observations include the presence of both $I^{+} \to (I - 1)^{-}$ and $I^{-} \to (I - 1)^{+} E 1$ transitions linking states of the yrast and negative-parity bands at high spin and the presence of an additional even-spin, positive-parity band deexciting exclusively to the negative-parity sequence. The observations appear to be consistent with expectations based on the recently proposed concept of octupole phonon condensation.

Received 10 December 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.122501

Authors & Affiliations

X. Wang^1,2,*, R. V. F. Janssens¹, M. P. Carpenter¹, S. Zhu¹, I. Wiedenhöver³, U. Garg², S. Frauendorf², T. Nakatsukasa⁴, I. Ahmad¹, A. Bernstein³, E. Diffenderfer³, S. J. Freeman^1,5, J. P. Greene¹, T. L. Khoo¹, F. G. Kondev⁶, A. Larabee⁷, T. Lauritsen¹, C. J. Lister¹, B. Meredith⁷, D. Seweryniak¹, C. Teal³, and P. Wilson³

¹Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
²Physics Department, University of Notre Dame, Notre Dame, Indiana 46556, USA
³Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
⁴RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
⁵Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom
⁶Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
⁷Greenville College, Greenville, Illinois 62246, USA

^*Present address: Department of Physics, Florida State University, Tallahassee, FL 32306, USA.

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Vol. 102, Iss. 12 — 27 March 2009

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Physical Review Letters

Structure of Pu240: Evidence for Octupole Phonon Condensation?

X. Wang, R. V. F. Janssens, M. P. Carpenter, S. Zhu, I. Wiedenhöver, U. Garg, S. Frauendorf, T. Nakatsukasa, I. Ahmad, A. Bernstein, E. Diffenderfer, S. J. Freeman, J. P. Greene, T. L. Khoo, F. G. Kondev, A. Larabee, T. Lauritsen, C. J. Lister, B. Meredith, D. Seweryniak, C. Teal, and P. Wilson

Phys. Rev. Lett. 102, 122501 – Published 23 March 2009

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Structure of ${}^{240}{Pu}$ : Evidence for Octupole Phonon Condensation?