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<font size="-1"><font face="Courier New, Courier, monospace">Dear
all, <br>
<br>
welcome to this week's JYFL Colloquium, on Friday 15 April,
already at 9:15, in FYS1. Coffee will be served at 9:00. <br>
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.<br>
<br>
Speaker: </font></font><font size="-1"><font face="Courier New,
Courier, monospace">Michael Block, GSI Helmholtzzentrum für
Schwerionenforschung mbH, Darmstadt, Germany<br>
</font></font><br>
<font size="-1"><font face="Courier New, Courier, monospace">Title:
High-precision mass measurements of Nobelium and Lawrencium
isotopes with SHIPTRAP<br>
<br>
Abstract:<br>
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.<br>
<br>
See you all there!<br>
Kari Eskola and Ilari Maasilta<br>
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