Superheavy elements with the Berkeley gas-filled separator.

Accession number;99A1007965
Title;Superheavy elements with the Berkeley gas-filled separator.
Author; GREGORICH K E (Lbl)
Journal Title;Abstracts of Papers. Symposium on Radiochemistry
Journal Code:F0139B
ISSN:1345-2762
VOL.43rd;NO.;PAGE.48(1999)
Figure&Table&Reference;
Pub. Country;Japan
Language;English
Abstract;In April and May of 1999 the Berkeley Gas-filled Separator was used to search for the production and decay of element 118 from the 86Kr+208Pb reaction, according to Smolanczuk's predictions of relatively large production rates. Three decay chains, each consisting of an implanted heavy ion, followed by a rapid (ms) succession of high-energy (>10 MeV) alpha-particle decays were detected. These chains are consistent with the production and decay of element 118 with mass number 293. These results a)show experimental evidence for the existence of shell-stabilized SHE, b) provide experimental values for refinement of nuclear mass models in the SHE region, and, most importantly, c) present a "new" reaction pathway for the production of SHE. A description of the separator, these experiments will be presented. (author abst.)
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