[?]
[Internal
information]
|
Welcome to the home page of the research group PHOTONS
hosted by SUBATECH.
RECENT WORKS
ACTIVITY REPORT
1999 (in french)
GRADUATED STAYS 1999/2000 (in
french)
Research Program
The research program of the PHOTONS group at SUBATECH concentrates on the
study of nuclear matter thermodynamics. The phase diagram (density versus
temperature) of nuclear matter is explored by colliding heavy ions which
kinetic energy is varied to approach the critical regions. At low bombarding
energies, from a few ten to a few hundred of A MeV, the phase transition
from liquid to gas is searched for; at higher energies, from a few hundred
of A GeV to a few A TeV, the phase transition from hadronic matter to a
plasma of quarks and gluons is under study.
Once nuclear matter is heated and/or compressed to extreme values,
the experimental challenge consists in the selection of several observables
which convey adequate information on the thermodynamic state of the state
of nuclear matter under study. It appears very unlikely that the choice
of a single observable is sufficient to draw unambiguous conclusions on
the characteristic properties of the state of matter. It becomes therefore
unavoidable to correlate several observables . We follow such an approach
by selecting photons as a probe of the initial and hottest stage of the
collision and light mesons as a probe of the later or hadronic stage ...(more..
in french).
The group is involved with the following collaborations:
-
TAPS, the Two
Arms Photon Spectrometer for the detection of photons from a few hundred
of keV up to a few GeV, emitted in heavy-ion collisions from a few ten
of A MeV up to a few A GeV.
-
WA98, an experiment
at
CERN for the simultaneous detection
of photons and charged as well as neutral hadrons produced in a few hundred
A MeV heavy-ion collisions.
-
PHENIX, one of the
large experiment at RHIC at BNL
oriented mainly towards the detection of photons and di-leptons.
-
ALICE, a heavy-ion experiment
for the future LHC, the hadron collider
at CERN.
|
![[Stats]](http://www-subatech.in2p3.fr/~photons/images/webstat.gif){kind=small}