Parity doubling in $^{219}\mathrm{Th}$ and the onset of collectivity above $N=126$

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Parity doubling in ${}^{219}{Th}$ and the onset of collectivity above $N = 126$

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

Phys. Rev. C 80, 011304(R) – Published 15 July 2009

Abstract

Excited states in ${}^{219}{Th}$ have been observed for the first time in an experiment using the ${}^{26}{Mg} + {}^{198}{Pt}$ reaction and evaporation-residue-gated $γ$ -ray spectroscopy. Two structures of interlinked alternating-parity levels with simplex quantum numbers $s = \pm i$ are observed, reminiscent of similar sequences in heavier odd-mass isotopes, but only three mass units away from the $N = 126$ neutron closed shell. The emergence of quadrupole-octupole collectivity in this mass region and the trend for parity-doublet bands are discussed.

Received 21 May 2009

DOI:https://doi.org/10.1103/PhysRevC.80.011304

Authors & Affiliations

W. Reviol¹, D. G. Sarantites¹, C. J. Chiara^1,2,*, M. Montero^1,†, R. V. F. Janssens², M. P. Carpenter², T. L. Khoo², T. Lauritsen², C. J. Lister², D. Seweryniak², S. Zhu², O. L. Pechenaya^3,‡, and S. G. Frauendorf⁴

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

^*Present address: Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.
^†Present address: Department of Physics, Stanford University, Stanford, California 94305, USA.
^‡Present address: Department of Radiation Oncology, Washington University School of Medicine, St. Louis, Missouri 63130, USA.

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Vol. 80, Iss. 1 — July 2009

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Physical Review C

covering nuclear physics

Parity doubling in ${}^{219}{Th}$ and the onset of collectivity above $N = 126$

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

Phys. Rev. C 80, 011304(R) – Published 15 July 2009

Abstract

Authors & Affiliations

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Physical Review C

covering nuclear physics

Parity doubling in Th219 and the onset of collectivity above N=126

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

Phys. Rev. C 80, 011304(R) – Published 15 July 2009

Abstract

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Parity doubling in ${}^{219}{Th}$ and the onset of collectivity above $N = 126$