BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Isotope shift computations for medium and heavy elements: A challe
 nge for atomic theory ?
DTSTART;VALUE=DATE-TIME:20120425T123000Z
DTEND;VALUE=DATE-TIME:20120425T131000Z
DTSTAMP;VALUE=DATE-TIME:20130525T222902Z
UID:indico-event-181836@cern.ch
DESCRIPTION:Isotope shift measurements have been found valuable for determ
 ining changes in the nuclear distributions and charge radii. Isotopes wit
 h one or a few additional neutrons are not only heavier than others but\,
  more often than not\, also exhibit quite different charge and magnetizat
 ion distributions. Using laser spectroscopy\, precise isotope shift measu
 rements have been carried during the last decade along different isotopic
  chains and were found a versatile alternative to x-ray measurements in m
 uonic atoms or electron scattering.\nHowever\, in order to extract useful
  information about the nuclear structure and radii from shifts in the ato
 mic transition frequencies\, the `electronic response' to the nuclear cha
 nges need to be known in sufficient detail. Apart from King-plot techniqu
 es\, which applies information from different stable isotopes\, atomic st
 ructure theory may help understand and provide this response in terms of 
 mass- and field-shift parameters for optical transitions of interest. Up 
 to the present\, however\, little is known about these isotope parameters
  for most transitions in medium and heavy elements and\, especially\, for
  ions with complex shell structures. Difficulties in applying atomic theo
 ry arise\, in particular\, from the relativistic motion and the number of
  electrons in such atoms and ions as well as from (nearly) degenerate con
 figurations. --- In this seminar\, I shall outline these difficulties and
  discuss the recent successes (and failures) in calculating accurate isot
 ope-shift parameters. Examples from medium-to-large scale atomic computat
 ions are presented and display how sensitive the isotope parameters behav
 e with regard to the electronic shell structure and correlations. A few c
 onclusions are drawn about which optical transitions might be less sensit
 ive to correlation effects and\, hence\, useful for laser-spectroscopic s
 tudies.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=181836
LOCATION:CERN 26-1-022
URL:http://indico.cern.ch/conferenceDisplay.py?confId=181836
END:VEVENT
END:VCALENDAR