Experimental study of isomeric intruder ${\frac{1}{2}}^{+}$ states in $^{197,203}\mathrm{At}$

Experimental study of isomeric intruder ${\frac{1}{2}}^{+}$ states in ${}^{197, 203}{At}$

K. Auranen, J. Uusitalo, S. Juutinen, H. Badran, F. Defranchi Bisso, D. Cox, T. Grahn, P. T. Greenlees, A. Herzáň, U. Jakobsson, R. Julin, J. Konki, M. Leino, A. Lightfoot, M. Mallaburn, O. Neuvonen, J. Pakarinen, P. Papadakis, J. Partanen, P. Rahkila, M. Sandzelius, J. Sarén, C. Scholey, J. Sorri, and S. Stolze

Phys. Rev. C 95, 044311 – Published 10 April 2017

Abstract

A newly observed isomeric intruder $½^{+}$ state $[T_{½} = 3.5 (6) ms]$ is identified in ${}^{203}{At}$ using a gas-filled recoil separator and fusion-evaporation reactions. The isomer is depopulated through a cascade of $E 3$ and mixed $M 1 / E 2$ transitions to the ${9 / 2}^{-}$ ground state, and it is suggested to originate from the $π {(s_{½})}^{- 1}$ configuration. In addition, the structures above the $½^{+}$ state in ${}^{203}{At}$ and ${}^{197}{At}$ are studied using in-beam $γ$ -ray spectroscopy, recoil-decay tagging, and recoil-isomer decay tagging methods. The $½^{+}$ state is fed from ${3 / 2}^{+}$ and ${5 / 2}^{+}$ states, and the origin of these states are discussed.

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Received 3 November 2016

DOI:https://doi.org/10.1103/PhysRevC.95.044311

Physics Subject Headings (PhySH)

Alpha decay Electromagnetic transitions Energy levels Isomer decays Lifetimes & widths Nuclear spin & parity Nuclear structure & decays

190 ≤ A ≤ 219

Nuclear Physics

Authors & Affiliations

K. Auranen^1,2,*, J. Uusitalo¹, S. Juutinen¹, H. Badran¹, F. Defranchi Bisso¹, D. Cox¹, T. Grahn¹, P. T. Greenlees¹, A. Herzáň^1,†, U. Jakobsson^3,‡, R. Julin¹, J. Konki¹, M. Leino¹, A. Lightfoot¹, M. Mallaburn⁴, O. Neuvonen¹, J. Pakarinen¹, P. Papadakis¹, J. Partanen¹, P. Rahkila¹, M. Sandzelius¹, J. Sarén¹, C. Scholey¹, J. Sorri¹, and S. Stolze¹

¹Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 University of Jyvaskyla, Finland
²Argonne National Laboratory, 9700 South Cass Ave., Lemont, Illinois 60439, USA
³Department of Physics, Royal Institute of Technology, SE-10691 Stockholm, Sweden
⁴School of Physics and Astronomy, Schuster Building, The University of Manchester, Manchester M13 9PL, United Kingdom

^*kauranen@anl.gov
^†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 University of Helsinki, Finland.

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Vol. 95, Iss. 4 — April 2017

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Physical Review C

covering nuclear physics

Experimental study of isomeric intruder ${\frac{1}{2}}^{+}$ states in ${}^{197, 203}{At}$

Phys. Rev. C 95, 044311 – Published 10 April 2017

Abstract

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Authors & Affiliations

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Physical Review C

covering nuclear physics

Experimental study of isomeric intruder 12+ states in At197,203

Phys. Rev. C 95, 044311 – Published 10 April 2017

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Experimental study of isomeric intruder ${\frac{1}{2}}^{+}$ states in ${}^{197, 203}{At}$