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Experimental study of 1/2(+) isomers in At-199,At-201

K. Auranen J. Uusitalo S. Juutinen U. Jakobsson T. Grahn P.T. Greenlees K. Hauschild 1 A. Herzan R. Julin J. Konki M. .Leino J. Pakarinen J. Partanen P. Peura P. Rahkila P. Ruotsalainen M. Sandzelius J. Saren C. Scholey J. Sorri S. Stolze
1 CSNSM SNO
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609
Abstract : Using fusion-evaporation reactions, a gas-filled recoil separator, and recoil-electron and recoil-electron-alpha tagging techniques, a new isomeric 1/2(+) state [T-1/2 = 45(3) ms] in At-201 is identified, and an earlier reported corresponding state [T-1/2 = 273(9) ms] in At-199 is confirmed. The 1/2(+) state is suggested to originate from an intruder pi(s(1/2))(-1) configuration. In addition, nuclear structure of states below and above this 1/2(+) state are studied in both nuclei. The isomer decays through a cascade of an E3 transition followed by a mixed M1/E2 transition to the 9/2(-) ground state, and it is interpreted to be fed from nearly spherical 3/2(+) and 5/2(+) states originating from pi(d(3/2))(-1) and pi(d(5/2))(-1) configurations, respectively.
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Submitted on : Friday, September 26, 2014 - 4:31:15 PM
Last modification on : Wednesday, September 16, 2020 - 5:43:22 PM

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K. Auranen, J. Uusitalo, S. Juutinen, U. Jakobsson, T. Grahn, et al.. Experimental study of 1/2(+) isomers in At-199,At-201. Physical Review C, American Physical Society, 2014, 90, pp.024310. ⟨10.1103/PhysRevC.90.024310⟩. ⟨in2p3-01068530⟩

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