Physics Letters B (Nov 2021)
Evidence of oblate-prolate shape coexistence in the strongly-deformed nucleus 119Cs
- K.K. Zheng,
- C.M. Petrache,
- Z.H. Zhang,
- P.W. Zhao,
- Y.K. Wang,
- A. Astier,
- B.F. Lv,
- P.T. Greenlees,
- T. Grahn,
- R. Julin,
- S. Juutinen,
- M. Luoma,
- J. Ojala,
- J. Pakarinen,
- J. Partanen,
- P. Rahkila,
- P. Ruotsalainen,
- M. Sandzelius,
- J. Sarén,
- H. Tann,
- J. Uusitalo,
- G. Zimba,
- B. Cederwall,
- Ö. Aktas,
- A. Ertoprak,
- W. Zhang,
- S. Guo,
- M.L. Liu,
- I. Kuti,
- B.M. Nyakó,
- D. Sohler,
- J. Timár,
- C. Andreoiu,
- M. Doncel,
- D.T. Joss,
- R.D. Page
Affiliations
- K.K. Zheng
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France; Key Laboratory of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- C.M. Petrache
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France; Corresponding author.
- Z.H. Zhang
- Mathematics and Physics Department, North China Electric Power University, Beijing 102206, China
- P.W. Zhao
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
- Y.K. Wang
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
- A. Astier
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
- B.F. Lv
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France; Key Laboratory of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- P.T. Greenlees
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
- T. Grahn
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
- R. Julin
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
- S. Juutinen
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
- M. Luoma
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
- J. Ojala
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
- J. Pakarinen
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
- J. Partanen
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
- P. Rahkila
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
- P. Ruotsalainen
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
- M. Sandzelius
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
- J. Sarén
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
- H. Tann
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014, University of Jyväskylä, Finland; Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom
- J. Uusitalo
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
- G. Zimba
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
- B. Cederwall
- KTH Department of Physics, S-10691 Stockholm, Sweden
- Ö. Aktas
- KTH Department of Physics, S-10691 Stockholm, Sweden
- A. Ertoprak
- KTH Department of Physics, S-10691 Stockholm, Sweden
- W. Zhang
- KTH Department of Physics, S-10691 Stockholm, Sweden
- S. Guo
- Key Laboratory of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Science, Beijing 100049, China
- M.L. Liu
- Key Laboratory of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Science, Beijing 100049, China
- I. Kuti
- Institute for Nuclear Research (Atomki-ELKH), 4001 Debrecen, Hungary
- B.M. Nyakó
- Institute for Nuclear Research (Atomki-ELKH), 4001 Debrecen, Hungary
- D. Sohler
- Institute for Nuclear Research (Atomki-ELKH), 4001 Debrecen, Hungary
- J. Timár
- Institute for Nuclear Research (Atomki-ELKH), 4001 Debrecen, Hungary
- C. Andreoiu
- Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
- M. Doncel
- Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom
- D.T. Joss
- Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom
- R.D. Page
- Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom
- Journal volume & issue
-
Vol. 822
p. 136645
Abstract
Prolate-oblate shape coexistence close to the ground state in the strongly-deformed proton-rich A≈120 nuclei is reported for the first time. One of the four reported bands in 119Cs, built on a 11/2− state at 670 keV, consists of nearly degenerate signature partners, and has properties which unequivocally indicate the strongly-coupled πh11/2[505]11/2− configuration associated with oblate shape. Together with the decoupled πh11/2[541]3/2− band built on the 11/2− prolate state at 110 keV, for which a half-life of T1/2=55(5)μs has been measured, the new bands bring evidence of shape coexistence at low spin in the proton-rich strongly deformed A≈120 nuclei, a phenomenon predicted since long time, but not yet observed. Calculations using the particle-number conserving cranked shell model and two dimensional tilted axis cranking covariant density functional theory support and well reproduce the observed oblate and prolate coexisting low-energy states in 119Cs.
