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alpha decay of At-194

Abstract : Detailed alpha-decay studies of the neutron-deficient isotope 194At have been performed in the complete fusion reaction 56Fe+141Pr-->194At+3n at the velocity filter SHIP. Two alpha-decaying isomeric states with half-lives of T1/2(194Atm1)=310(8) ms and T1/2(194Atm2)=253(10) ms were identified in this nucleus. Their complex decays to the states in the daughter nucleus 190Bi are discussed in the article. We propose that similar to the case of the neighboring 191,192,193,195At isotopes, the oblate-deformed configurations based on the proton 1/2+[440] and/or 7/2-[514] Nilsson orbitals become important in 194At. A new isomeric state with the half-life of 175(8) ns was observed in 190Bi.
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Contributor : Sophie Heurteau <>
Submitted on : Wednesday, September 9, 2009 - 4:52:58 PM
Last modification on : Thursday, July 8, 2021 - 3:39:17 AM

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A.N. Andreyev, S. Antalic, D. Ackermann, L. Bianco, S. Franchoo, et al.. alpha decay of At-194. Physical Review C, American Physical Society, 2009, 79, pp.064320. ⟨10.1103/PhysRevC.79.064320⟩. ⟨in2p3-00411501⟩



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