Argonne Physics Division Colloquium - 30 Apr 2010

11:00 AM, Building 203 auditorium

A new generation of calculations of light nuclei has deepened our
understanding of nuclear structure. These sophisticated methods are
constantly developing and precise measurements are necessary to
challenge and refine the calculations. A wide variety of experimental
tests are possible and a brief overview of these will be presented. A
specific test involves inferring lifetimes through the slowing of nuclei
in materials, the Doppler Shift Attenuation Method (DSAM) and improving
the accuracy to a level where the electromagnetic matrix elements
between excited states can provide useful constraints on modern
calculations. An improved DSAM technique will be discussed which
includes careful selection of the kinematic conditions for producing the
states of interest, control of feeding from higher levels, improvements
in gamma-ray detection, and better knowledge of how ions stop in
materials. Each are important for moving far beyond the original
measurements from the 1960's and improving both precision and accuracy.
Results of experiments on ^{10}Be and ^{10}C will be presented and discussed
in terms of recent ab-initio calculations.

Argonne Physics Division Colloquium Schedule