The synthesis of the deformed superheavy elements 107 to 111
By inflight separation, implantation into Si-detector arrays, and correlation analysis of subsequent {alpha}-decay chains many isotopes were discovered at GSI since 1980, among others the elements Nielsbohriurn, Hassium and Meitnerium. The sensitivity of the method allows to identify an element by one decay chain, as we demonstrated for the case of {sup 266}Mt. After a break of our work during the time when the new accelerator system SIS-FRS-ESR was installed (1989-1993) at GSI, and many improvements of our system EZR-UNILAC-SHIP accomplished, we restarted element synthesis in 1994. The synthesis of the isotopes {sup 269}110, {sup 271}110, and {sup 272 }111 of the new elements Z--110 and Z=l11 was a first success at the end of 1994. This discovery is in the center of this presentation. The reaction mechanism, a one-step, cold and compact rearrangement process at a level of some 10{sup -36} cm{sup 2} is discussed. Cross sections and excitation functions systematically studied allow to extrapolate to the next element Z=112, which seems not to be out of reach.
- OSTI ID:
- 255523
- Report Number(s):
- CONF-9510116--
- Journal Information:
- Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 10 Vol. 40; ISSN BAPSA6; ISSN 0003-0503
- Country of Publication:
- United States
- Language:
- English
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