Decay spectroscopy of Pb97182179 and evidence for a 9/2 intruder state in Tl98181179

H. Badran, C. Scholey, J. Uusitalo, K. Auranen, T. Grahn, P. T. Greenlees, A. Herzáň, U. Jakobsson, R. Julin, S. Juutinen, J. Konki, M. Leino, M. J. Mallaburn, J. Pakarinen, P. Papadakis, J. Partanen, P. Peura, P. Rahkila, M. Sandzelius, J. Sarén, J. Sorri, and S. Stolze
Phys. Rev. C 96, 064314 – Published 18 December 2017

Abstract

The very neutron-deficient isobars Pb179 and Tl179 have been produced using the fusion-evaporation reactions Pd104(Kr78,xpyn), where x1 and y2. The gas-filled separator RITU was employed to transport and separate the recoiling nuclei of interest from the scattered beam and unwanted products. The GREAT spectrometer was used to study the decay properties through αα and αγ correlations, which has allowed the ground state of Pb179 to be assigned as Iπ=9/2. The decay of Pb179 was measured to have an α-particle energy and half-life of Eα=7348(5)keV and t1/2=2.7(2) ms, respectively. A search for a νi13/2 state in Pb179 was performed, but only a limit of excitation energy and half-life was obtained. In Tl179 a t1/2=11410+18 ns isomeric state, likely at an excitation energy of 904.5(9) keV, was identified and is tentatively assigned to be a 9/2 proton intruder state.

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  • Received 31 July 2017
  • Revised 13 November 2017

DOI:https://doi.org/10.1103/PhysRevC.96.064314

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

H. Badran1,*, C. Scholey1, J. Uusitalo1, K. Auranen1,†, T. Grahn1, P. T. Greenlees1, A. Herzáň1,‡, U. Jakobsson2,§, R. Julin1, S. Juutinen1, J. Konki1, M. Leino1, M. J. Mallaburn1,3, J. Pakarinen1, P. Papadakis1, J. Partanen1, P. Peura1,∥, P. Rahkila1, M. Sandzelius1, J. Sarén1, J. Sorri1,¶, and S. Stolze1

  • 1University of Jyvaskyla, Department of Physics, PO Box 35, FI-40014, Jyvaskyla, Finland
  • 2Department of Physics, KTH-Royal Institute of Technology, SE-10691 Stockholm, Sweden
  • 3University of Manchester, Manchester M13 9PL, United Kingdom

  • *hussam.h.badran@jyu.fi
  • Present address: Argonne National Laboratory, 9700 Cass Ave, Lemont, IL 60439, United States.
  • Present address: Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom.
  • §Present address: Laboratory of Radiochemistry, Department of Chemistry, P.O. Box 55, FI-00014 Univeristy of Helsinki, Finland.
  • Present address: Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland.
  • Present address: Finnish Defence Forces, Logistics Command.

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Vol. 96, Iss. 6 — December 2017

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