Deformed band structures in neutron-rich Pm152158 isotopes

S. Bhattacharyya, E. H. Wang, A. Navin, M. Rejmund, J. H. Hamilton, A. V. Ramayya, J. K. Hwang, A. Lemasson, A. V. Afanasjev, Soumik Bhattacharya, J. Ranger, M. Caamaño, E. Clément, O. Delaune, F. Farget, G. de France, B. Jacquot, Y. X. Luo, Yu. Ts. Oganessian, J. O. Rasmussen, G. M. Ter-Akopian, and S. J. Zhu
Phys. Rev. C 98, 044316 – Published 17 October 2018

Abstract

High spin band structures of neutron-rich Pm152158 isotopes have been obtained from the measurement of prompt γ rays of isotopically identified fragments produced in fission of U238+Be9 and detected using the VAMOS++ magnetic spectrometer and EXOGAM segmented Clover array at GANIL and also from the high statistics γγγ and γγγγ data from the spontaneous fission of Cf252 using Gammasphere. The excited states in Pm157 and those above the isomers in even-A Pm isotopes Pm152,154,156,158 have been identified for the first time. The spectroscopic information on the rotational band structures in odd-A Pm isotopes has been extended considerably to higher spins and the possibility of the presence of reflection asymmetric shapes is explored. The configuration assignments are based on the results of cranked relativistic Hartree-Bogoliubov calculations. From the systematics of bands in odd-A Pm isotopes and weak population of opposite parity bands, octupole deformed shapes in neutron-rich Pm isotopes beyond N=90 seem unlikely to be present.

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  • Received 24 October 2017
  • Revised 3 August 2018

DOI:https://doi.org/10.1103/PhysRevC.98.044316

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

S. Bhattacharyya1,2,*, E. H. Wang3, A. Navin4, M. Rejmund4, J. H. Hamilton3, A. V. Ramayya3, J. K. Hwang3, A. Lemasson4, A. V. Afanasjev5, Soumik Bhattacharya1,2, J. Ranger3, M. Caamaño6, E. Clément4, O. Delaune4, F. Farget4, G. de France4, B. Jacquot4, Y. X. Luo3,7, Yu. Ts. Oganessian8, J. O. Rasmussen7, G. M. Ter-Akopian8, and S. J. Zhu9

  • 1Variable Energy Cyclotron Centre, 1/AF Bidhannagar, Kolkata 700064, India
  • 2Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai-400094, India
  • 3Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA
  • 4GANIL, CEA/DRF-CNRS/IN2P3, Boulevard Henri Becquerel, BP 55027, F-14076 Caen Cedex 5, France
  • 5Department of Physics and Astronomy, Mississippi State University, Mississippi 39762, USA
  • 6USC, Universidad de Santiago de Compostela, E-15706 Santiago de Compostela, Spain
  • 7Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 8Joint Institute for Nuclear Research, RU-141980 Dubna, Russian Federation
  • 9Department of Physics, Tsinghua University, Beijing 100084, People's Republic of China

  • *Corresponding author: sarmi@vecc.gov.in

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Issue

Vol. 98, Iss. 4 — October 2018

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