[f(k)] Colloquium M. Block, Fri 15.4. --EARLY-- at 9:15 in FYS1

[Kari J. Eskola]

Dear all,

welcome to this week's JYFL Colloquium, on Friday 15 April, already at 
9:15, in FYS1. Coffee will be served at 9:00.
PLEASE NOTE THE EXCEPTIONAL TIME - this is due to the fact that the 
speaker is a member of the Physics Advisory Committee of our Accelerator 
Lab, and this colloquium serves also as an opening to the PAC meeting here.

Speaker: Michael Block, GSI Helmholtzzentrum für Schwerionenforschung 
mbH, Darmstadt, Germany

Title: High-precision mass measurements of Nobelium and Lawrencium 
isotopes with SHIPTRAP

Abstract:
Nuclear ground state properties represent key information on nuclear 
matter at the borderline of nuclear existence. The region of superheavy 
elements that owe their stability to shell effects is of particular 
interest. For a deeper understanding of the structure of superheavy 
elements accurate data on different properties of nuclides in the region 
Z > 100 such as half-lives, masses, and energies of excited states are 
crucial. They will allow benchmarking different nuclear models helping 
to refine their predictions for the location of the next spherical shell 
closures above 208Pb. A combination of buffer gas stopping and advanced 
ion-beam manipulation techniques has paved the way to prepare heavy 
elements produced in complete-fusion reaction at low energies suitable 
for ion trapping. This recently led to the first direct mass 
measurements of nobelium and lawrencium isotopes with the Penning trap 
mass spectrometer SHIPTRAP at GSI. Recent results will be presented and 
perspectives for high-precision measurements of superheavy elements will 
be discussed.

See you all there!
     Kari Eskola and Ilari Maasilta
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