Abstract
This article has been retracted: see Phys. Rev. Lett. 89, 039901 (2002)
Following a prediction by Smolańczuk [Phys. Rev. C 59, 2634 (1999)], we searched for superheavy element formation in the bombardment of with 449-MeV ions. We have observed three decay chains, each consisting of an implanted heavy atom and six subsequent decays, correlated in time and position. In these decay chains, a rapid (ms) sequence of high energy particles ( ) indicates the decay of a new high- element. The observed chains are consistent with the formation of and its decay by sequential -particle emission to , , , , ( ) and ( ). The production cross section is .
- Received 27 May 1999
DOI:https://doi.org/10.1103/PhysRevLett.83.1104
©1999 American Physical Society