γ-ray spectroscopy of low-lying excited states and shape competition in Os194

T. Daniel, S. Kisyov, P. H. Regan, N. Marginean, Zs. Podolyák, R. Marginean, K. Nomura, M. Rudigier, R. Mihai, V. Werner, R. J. Carroll, L. A. Gurgi, A. Oprea, T. Berry, A. Serban, C. R. Nita, C. Sotty, R. Suvaila, A. Turturica, C. Costache, L. Stan, A. Olacel, M. Boromiza, and S. Toma
Phys. Rev. C 95, 024328 – Published 28 February 2017

Abstract

The properties of excited states in the neutron-rich nucleus Os194 have been investigated using the Os192(O18,O16)Os194 reaction with an 80 MeV beam provided by the IFIN-HH Laboratory, Bucharest. Discrete γ-ray decays from excited states have been measured using the hybrid HPGe-LaBr3(Ce) array RoSPHERE. The current work identifies a number of previously unreported low-lying nonyrast states in Os194 as well as the first measurement of the half-life of the yrast 2+ state of 302(50) ps. This is equivalent to a B(E2:2+0+)=45(16) W.u. and intrinsic quadrupole deformation of βeff=0.14(1). The experimental results are compared with Hartree-Fock-Bogoliubov–interacting-boson-model calculations and are consistent with a reduction in a quadrupole collectivity in Os isotopes with increasing neutron number.

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  • Received 20 December 2016

DOI:https://doi.org/10.1103/PhysRevC.95.024328

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

T. Daniel1,2,*, S. Kisyov3, P. H. Regan1,4, N. Marginean3, Zs. Podolyák1, R. Marginean3, K. Nomura5,6, M. Rudigier1, R. Mihai3, V. Werner7, R. J. Carroll1, L. A. Gurgi1, A. Oprea3, T. Berry1, A. Serban3,8, C. R. Nita3, C. Sotty3, R. Suvaila3, A. Turturica3, C. Costache3, L. Stan3, A. Olacel3, M. Boromiza3,8, and S. Toma3

  • 1Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
  • 2Department of Physics, Benue State University, PMB 102119, Makurdi, Nigeria
  • 3Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), RO-077125 Bucharest, Romania
  • 4AIR Division, National Physical Laboratory, Teddington TW11 0LW, United Kingdom
  • 5Department of Physics, Faculty of Science, University of Zagreb, Bijenicka Cesta 32, HR-10000 Zagreb, Crotia
  • 6Center for Computational Sciences, University of Tsukuba, Tsukuba 305-8577, Japan
  • 7Institut für Kernphysik, T.U. Darmstadt, 64289 Darmstadt, Germany
  • 8University of Bucharest, Faculty of Physics, Magurele-Bucharest, Romania

  • *t.daniel@surrey.ac.uk

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Vol. 95, Iss. 2 — February 2017

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