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Spectroscopy of At-201 including the observation of a shears band and the 29/2(+) isomeric state

K. Auranen J. Uusitalo S. Juutinen U. Jakobsson T. Grahn T. Greenlees P. 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 Sciences Nucléaires et de Sciences de la Matière : UMR8609, CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Abstract : The excited states of At-201 were studied and an isomeric 29/2(+) state [T-1/2 = 3.39(9) mu s] was identified by using a fusion-evaporation reaction, a gas-filled recoil separator, and recoil gating techniques. The 29/2(+) state is suggested to originate from the pi(h(9/2)) circle times vertical bar Po-200; 11(-)> configuration, and it decays through the 269-and 339-keV E2-and E3-type transitions, respectively. Moreover, a cascade of magnetic dipole transitions that is suggested to originate from a shears band was observed by using recoil-gated gamma- gamma(-gamma) coincidence techniques.
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Submitted on : Thursday, April 2, 2015 - 3:32:17 PM
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K. Auranen, J. Uusitalo, S. Juutinen, U. Jakobsson, T. Grahn, et al.. Spectroscopy of At-201 including the observation of a shears band and the 29/2(+) isomeric state. Physical Review C, American Physical Society, 2015, 91 (ISSUE 2), pp.024324. ⟨10.1103/PhysRevC.91.024324⟩. ⟨in2p3-01138748⟩

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