By Norman M. Edelstein

ISBN-10: 0080291937

ISBN-13: 9780080291932

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Extra info for Actinides in Perspective. Proceedings of the Actinides–1981 Conference, Pacific Grove, California, USA, 10–15 September 1981

Sample text

The maximum Z that could be accelerated was around argon, and the maximum average beam current was a few microamperes for the lighter elements. Construction of the Berkeley HILAC was completed early in 1957, and, after a long debugging stage, experiments were envisioned looking toward the production of element 102. Before these could be carried out, though, we were surprised by an announcement from Sweden in the summer of 1957. A group of workers from the Argonne National Laboratory, the Atomic Energy Establishment at Harwell in England, and the Nobel Institute for Physics in Stockholm claimed the discovery of an isotope of element 102 as a result of research done at the Nobel Institute (Fields and co-workers, 1957).

Finally, for we had nothing to lose, one of the irradiations was prolonged in the hope that maybe something longer-lived, in the range of an hour or two, might show up. We had been concentrating in the range of 5 to 10 minutes. Still no new alpha counts showed up in the alpha-pulse analyzer, but after a very long interval, a single event occurred that showed up on a paper chart recorder. The recorder had been set up to measure the height of very large ionization pulses that would occur in the ion chamber whenever a spontan­ eous fission (SF) took place in the sample.

87 MeV (Eskola and co-workers, 1971). This proved to be a crucial factor in the identi­ fication of isotopes of element 105. In 1970, our group (Silva and co-workers, 1970a), in a tour-de-force of chemistry, succeeded in showing that lawrencium reverted to the III state in aqueous solution, as expected by the actinide hypothesis. This extremely difficult experiment employed the 35-sec 2 5 6 L P isotope so that speed was vitally necessary. A solvent extraction method was used to dis­ tinguish between 2+, 3+, and 4+ oxidation states.

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Actinides in Perspective. Proceedings of the Actinides–1981 Conference, Pacific Grove, California, USA, 10–15 September 1981 by Norman M. Edelstein


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