Observation of Superheavy Nuclei Produced in the Reaction of K{number_sign}86r with P{number_sign}208b
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331 (United States)
- Department of Chemistry, University of California, Berkeley, California 94720 (United States)
Following a prediction by Smola{acute n}czuk [Phys. Rev. C {bold 59}, 2634 (1999)], we searched for superheavy element formation in the bombardment of {sup 208}Pb with 449-MeV {sup 86}Kr ions. We have observed three decay chains, each consisting of an implanted heavy atom and six subsequent {alpha} decays, correlated in time and position. In these decay chains, a rapid (ms) sequence of high energy {alpha} particles (E{sub {alpha}}{ge}10 MeV ) indicates the decay of a new high-Z element. The observed chains are consistent with the formation of {sup 293}118 and its decay by sequential {alpha} -particle emission to {sup 289}116 , {sup 285}114 , {sup 281}112 , {sup 277}110 , {sup 273}Hs (Z=108 ) and {sup 269}Sg (Z=106 ). The production cross section is 2.2{sup +2.6}{sub {minus}0.8} pb . {copyright} {ital 1999} {ital The American Physical Society }
- Research Organization:
- Lawrence Berkeley National Laboratory
- DOE Contract Number:
- AC03-76SF00098; FG06-88ER40402
- OSTI ID:
- 365895
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 6 Vol. 83; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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