1999/08/09 by V. Ninov, Κ. Ε. Gregorich, W. Loveland +12 · 8 citations
Physics and Astronomy · #Nuclear physics research studies #Astronomical and nuclear sciences #Atomic and Molecular Physics
paper · doi:10.1103/physrevlett.83.1104
openalex publication_date 1999/08/09 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
Following a prediction by Smola\ifmmode \acuten\else 'n\ficzuk [Phys. Rev. C 59, 2634 (1999)], we searched for superheavy element formation in the bombardment of 208Pb with 449-MeV 86Kr ions. We have observed three decay chains, each consisting of an implanted heavy atom and six subsequent \ensuremathα decays, correlated in time and position. In these decay chains, a rapid (ms) sequence of high energy \ensuremathα particles ( E_\ensuremathα\ensuremath≥10MeV) indicates the decay of a new high- Z element. The observed chains are consistent with the formation of 293118 and its decay by sequential \ensuremathα-particle emission to 289116, 285114, 281112, 277110, 273Hs ( Z\phantom\rule0ex0ex=\phantom\rule0ex0ex108) and 269Sg ( Z\phantom\rule0ex0ex=\phantom\rule0ex0ex106). The production cross section is 2.2_\ensuremath-0.8+2.6pb.