Physics Letters B (Sep 2021)
Lifetime measurements of excited states in 169,171,173Os: Persistence of anomalous B(E2) ratios in transitional rare earth nuclei in the presence of a decoupled i13/2 valence neutron
- W. Zhang,
- B. Cederwall,
- M. Doncel,
- Ö. Aktas,
- A. Ertoprak,
- R. Liotta,
- C. Qi,
- T. Grahn,
- B.S. Nara Singh,
- D.M. Cullen,
- D. Hodge,
- M. Giles,
- S. Stolze,
- H. Badran,
- T. Braunroth,
- T. Calverley,
- D.M. Cox,
- Y.D. Fang,
- P.T. Greenlees,
- J. Hilton,
- E. Ideguchi,
- R. Julin,
- S. Juutinen,
- M. Kumar Raju,
- H. Li,
- H. Liu,
- S. Matta,
- P. Subramaniam,
- V. Modamio,
- J. Pakarinen,
- P. Papadakis,
- J. Partanen,
- C.M. Petrache,
- P. Rahkila,
- P. Ruotsalainen,
- M. Sandzelius,
- J. Sarén,
- C. Scholey,
- J. Sorri,
- M.J. Taylor,
- J. Uusitalo,
- J.J. Valiente-Dobón
Affiliations
- W. Zhang
- KTH Royal Institute of Technology, 10691 Stockholm, Sweden; Corresponding author.
- B. Cederwall
- KTH Royal Institute of Technology, 10691 Stockholm, Sweden
- M. Doncel
- Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom; Department of Physics, Stockholm University, SE-10691 Stockholm, Sweden11 Present address.
- Ö. Aktas
- KTH Royal Institute of Technology, 10691 Stockholm, Sweden
- A. Ertoprak
- KTH Royal Institute of Technology, 10691 Stockholm, Sweden; Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Fatih, 34134 Istanbul, Turkey
- R. Liotta
- KTH Royal Institute of Technology, 10691 Stockholm, Sweden
- C. Qi
- KTH Royal Institute of Technology, 10691 Stockholm, Sweden
- T. Grahn
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
- B.S. Nara Singh
- Schuster Building, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United Kingdom; School of Computing Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, United Kingdom1
- D.M. Cullen
- Schuster Building, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United Kingdom
- D. Hodge
- Schuster Building, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United Kingdom
- M. Giles
- Schuster Building, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United Kingdom
- S. Stolze
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
- H. Badran
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
- T. Braunroth
- Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany
- T. Calverley
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
- D.M. Cox
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland; Department of Physics, Lund University, 221 00 Lund, Sweden1
- Y.D. Fang
- Research Center for Nuclear Physics, Osaka University, JP-567-0047 Osaka, Japan
- P.T. Greenlees
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
- J. Hilton
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
- E. Ideguchi
- Research Center for Nuclear Physics, Osaka University, JP-567-0047 Osaka, Japan
- R. Julin
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
- S. Juutinen
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
- M. Kumar Raju
- Research Center for Nuclear Physics, Osaka University, JP-567-0047 Osaka, Japan
- H. Li
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM–CNRS/IN2P3, F-14076 Caen Cedex 5, France
- H. Liu
- KTH Royal Institute of Technology, 10691 Stockholm, Sweden
- S. Matta
- KTH Royal Institute of Technology, 10691 Stockholm, Sweden
- P. Subramaniam
- KTH Royal Institute of Technology, 10691 Stockholm, Sweden
- V. Modamio
- Department of Physics, University of Oslo, NO-0316 Oslo, Norway
- J. Pakarinen
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
- P. Papadakis
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland; STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom1
- J. Partanen
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
- C.M. Petrache
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
- P. Rahkila
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
- P. Ruotsalainen
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
- M. Sandzelius
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
- J. Sarén
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
- C. Scholey
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
- J. Sorri
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland; Sodankylä Geophysical Observatory, FI-99600 Sodankylä, Finland1
- M.J. Taylor
- Division of Cancer Sciences, School of Medical Sciences, The University of Manchester, Manchester, M13 9PL, United Kingdom
- J. Uusitalo
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
- J.J. Valiente-Dobón
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
- Journal volume & issue
-
Vol. 820
p. 136527
Abstract
Lifetimes of low-lying excited states in the νi13/2+ bands of the neutron-deficient osmium isotopes 169,171,173Os have been measured for the first time using the recoil-distance Doppler shift and recoil-isomer tagging techniques. An unusually low value is observed for the ratio B(E2;21/2+→17/2+)/B(E2;17/2+→13/2+) in 169Os, similar to the “anomalously” low values of the ratio B(E2;41+→21+)/B(E2;21+→0gs+) previously observed in several transitional rare-earth nuclides with even numbers of neutrons and protons, including the neighbouring 168,170Os. Furthermore, the evolution of B(E2;21/2+→17/2+)/B(E2;17/2+→13/2+) with increasing neutron number in the odd-mass isotopic chain 169,171,173Os is observed to follow the same trend as observed previously in the even-even Os isotopes. These findings indicate that the possible quantum phase transition from a seniority conserving structure to a collective regime as a function of neutron number suggested for the even-even systems is maintained in these odd-mass osmium nuclei, with the odd valence neutron merely acting as a “spectator”. As for the even-even nuclei, the phenomenon is highly unexpected for nuclei that are not situated near closed shells.
