Spectroscopy of the proton drip-line nucleus ${}^{203}$Fr

Spectroscopy of the proton drip-line nucleus $^{203}$ Fr

U. Jakobsson, S. Juutinen, J. Uusitalo, M. Leino, K. Auranen, T. Enqvist, P. T. Greenlees, K. Hauschild, P. Jones, R. Julin, S. Ketelhut, P. Kuusiniemi, M. Nyman, P. Peura, P. Rahkila, P. Ruotsalainen, J. Sarén, C. Scholey, and J. Sorri

Phys. Rev. C 87, 054320 – Published 17 May 2013

Abstract

The nucleus $^{203}$ Fr has been studied through $γ$ -ray and electron spectroscopy, using the recoil-decay tagging technique. A 13/2 $^{+}$ state, with a half-life of 0.37(5) $μ$ s, has been observed in $^{203}$ Fr. Both the $α$ -decay branch and the internal de-excitation of the 1/2 $^{+}$ isomer in $^{203}$ Fr have been studied. Furthermore, the corresponding 1/2 $^{+}$ state, with a half-life of 0.31(8) s, has been found in $^{199}$ At. In addition, transitions feeding the 9/2 $^{-}$ ground state of $^{203}$ Fr have been identified. The observed level pattern suggests that the ground state is still spherical.

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Received 21 January 2013

DOI:https://doi.org/10.1103/PhysRevC.87.054320

Authors & Affiliations

U. Jakobsson^1,*, S. Juutinen¹, J. Uusitalo¹, M. Leino¹, K. Auranen¹, T. Enqvist², P. T. Greenlees¹, K. Hauschild³, P. Jones^1,†, R. Julin¹, S. Ketelhut^1,‡, P. Kuusiniemi², M. Nyman^1,§, P. Peura¹, P. Rahkila¹, P. Ruotsalainen¹, J. Sarén¹, C. Scholey¹, and J. Sorri¹

¹Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
²Oulu Southern Institute and Department of Physics, University of Oulu, Finland
³CSNSM, IN2P3-CNRS, F-91405 Orsay Campus, France

^*ulrika.jakobsson@jyu.fi
^†Present address: iThemba Laboratory for Accelerator Based Sciences, P. O. Box 722, 7129 Somerset West, South Africa.
^‡Present address: TRIUMF, Westbrook Mall, Vancouver, BC, V6T 2A3, Canada.
^§Present address: European Commission, Joint Research Centre, Institute for Reference Materials and Measurements (IRMM), Retieseweg 111, B-2440 Geel, Belgium.

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Vol. 87, Iss. 5 — May 2013

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