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SUMMARY:Lecture series on heavy and super heavy elements (3/3)
DTSTART;VALUE=DATE-TIME:20120511T120000Z
DTEND;VALUE=DATE-TIME:20120511T130000Z
DTSTAMP;VALUE=DATE-TIME:20130519T035240Z
UID:indico-event-186629@cern.ch
DESCRIPTION:Nuclear Chemistry of the Heaviest Elements at JAEA\n	Studies o
 n the chemical properties of the heaviest elements offer unique opportunit
 ies to obtain information about trends in the periodic table of the elemen
 ts at the limits of nuclear stability\, and to assess the magnitude of the
  influence of relativistic effects on chemical properties. From the calcul
 ations of electron configurations of heavier elements\, it is predicted th
 at sudden changes in the structure of electron shells may appear due to re
 lativistic effects which originate from the increasingly strong Coulomb fi
 eld of the highly charged atomic nucleus. Thus\, it is expected that heavi
 er elements show a drastic rearrangement of electrons in their atomic grou
 nd states\, and\, as electron configurations are responsible for chemical 
 behavior of elements\, such relativistic effects can lead to surprising ch
 emical properties. Increasing deviations from the periodicity of chemical 
 properties based on extrapolation from lighter homologues in the periodic 
 table are consequently predicted.\n\n	The heaviest elements must be produc
 ed at an accelerator using reactions of heavy-ion beams with heavy target 
 materials and must be identified by measurement of their decay or that of 
 their known daughter nuclei with unambiguous detection techniques. Both ha
 lf-lives and production rates of nuclides of heavier elements are rapidly 
 decreasing\, and so each atom produced decays before a new atom is synthes
 ized. This means any chemistry to be performed must be done on an "atom-at
 -a-time" basis. \n\n	To verify experimentally the influence of relativisti
 c effects of electron shell structure\, we are studying chemical propertie
 s of the heaviest elements\, rutherfordium (Rf: element 104)\, 261Rf (T1/2
  = 68 s) and dubnium (Db: element 105)\, 262Db (T1/2 = 34 s) that were pro
 duced via the reactions of 248Cm(18O\, 5n) and 248Cm(19F\, 5n)\, respectiv
 ely\, using the JAEA tandem accelerator. In the seminar\, chemical studies
  of Rf and Db at JAEA are reviewed. Then\, we briefly introduce recent ele
 ctrochemical studies of the heaviest elements on an atom-at-a-time scale.
  \n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=186629
LOCATION:CERN 26-1-022
URL:http://indico.cern.ch/conferenceDisplay.py?confId=186629
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