exotic nuclei structure and reaction noyaux exotiques ... - IPN - IN2P3

measurements. We can also control the density
ranging from 3.5 g.cm -3 to 13.2 g.cm -3 (25% to 97%
of the theoretical density of UC, determined by
helium pycnometry).
Work in progress and perspectives
The control of the grain size ranging from 1 to 30
µm (measured by Scanning Electron Microscope)
and also the control of the size and the distribution
of the pore size (measured by mercury porosimetry)
are in progress. The temperature and
the duration of the plateau are the parameters to
be studied. The kinetic of the closing of the pores
and the evolution of the mechanical strength of the
pellet during long term operation will also be studied.
The identification of the irradiation damages
will be undertaken. In the case of the use as a target,
measurement of diffusion/effusion of the fission
products by irradiation and gamma-ray measurements
will be performed in order to qualify the
target. A 3D modelling will be developed to define
the best structural characteristics for an “ideal” material
for radioactive isotopes beam production.
The material must have the maximum density for
fission production yield and also a maximum release
of fission products through the porous network.
These two requirements are antagonist. But
an optimum does exist for porosity, pore diameter
and length and pore distribution in the matrix.
We will also take back our reprocessing studies in
order to determine the kinetic of dissolution in corrosive
media.
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