Detailed spectroscopy of Bi195

A. Herzáň, S. Juutinen, K. Auranen, T. Grahn, P. T. Greenlees, K. Hauschild, U. Jakobsson, R. Julin, S. Ketelhut, M. Leino, A. Lopez-Martens, T. Lönnroth, P. Nieminen, M. Nyman, J. Partanen, P. Peura, P. Rahkila, P. Ruotsalainen, M. Sandzelius, J. Sarén, C. Scholey, J. M. K. Slotte, J. Sorri, S. Stolze, and J. Uusitalo
Phys. Rev. C 96, 014301 – Published 5 July 2017

Abstract

An experiment focused on the study of shape coexistence and new high-spin structures in Bi195 has been performed. The nucleus is in a transitional region of the bismuth isotope chain. A large number of new states have been found, resulting in a significant extension of the previously known level scheme. Several new collective structures have been identified. A strongly coupled rotational band built upon the 13/2+ isomeric state was extended up to Iπ=(49/2+) and an energy of 5706 keV. The Iπ=31/2+ member of the πi13/2 band was also found to feed a new long-lived isomeric state with an excitation energy of 2616 keV and a spin and parity of Iπ=29/2+. The half-life of the 29/2+ isomeric state was determined to be 1.49(1)μs. It decays via the emission of 457-keV E2 and 236-keV E1 transitions, respectively. A low-energy 46-keV E2 transition has been identified to depopulate the (29/2) isomeric state, with a measured half-life of T1/2=614(5)ns. This transition allows the excitation energy of the isomeric state to be determined as 2381 keV. The feeding patterns of both 29/2+ and (29/2) isomeric states have also been described. This is the first time collective structures have also been observed up to high spins and excitation energies in the neutron-deficient Bi195 nucleus. Evidence for the manifestation of shape coexistence in Bi195 is also discussed.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
5 More
  • Received 10 April 2017

DOI:https://doi.org/10.1103/PhysRevC.96.014301

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

A. Herzáň1,2,*, S. Juutinen2, K. Auranen2,†, T. Grahn2, P. T. Greenlees2, K. Hauschild2,‡, U. Jakobsson2,3,§, R. Julin2, S. Ketelhut2, M. Leino2, A. Lopez-Martens2,‡, T. Lönnroth4, P. Nieminen2,∥, M. Nyman2,¶, J. Partanen2, P. Peura2,5, P. Rahkila2, P. Ruotsalainen2,6, M. Sandzelius2, J. Sarén2, C. Scholey2, J. M. K. Slotte4, J. Sorri2, S. Stolze2, and J. Uusitalo2

  • 1Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
  • 2University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 University of Jyvaskyla, Finland
  • 3Department of Physics, KTH-Royal Institute of Technology, SE-10691 Stockholm, Sweden
  • 4Physics, Faculty of Science and Engineering, Åbo Akademi University, FI-20500 Turku, Finland
  • 5Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland
  • 6TRIUMF, Westbrook Mall, Vancouver, British Columbia, Canada V6T 2A3

  • *andrej.herzan@liverpool.ac.uk
  • Present address: Argonne National Laboratory, 9700 Cass Ave, Lemont, IL 60439, USA.
  • Present address: CSNSM, IN2P3-CNRS, F-91405 Orsay Campus, France.
  • §Present address: Laboratory of Radiochemistry, Department of Chemistry, P.O. Box 55, FI-00014 Univeristy of Helsinki, Finland.
  • Present address: Fortum Oyj, Power Division, P.O. Box 100, 00048 Fortum, Finland.
  • Present address: European Commission, Joint Research Centre, IRMM, Retieseweg 111, B-2440 Geel, Belgium.

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 96, Iss. 1 — July 2017

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review C

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×