2007 Annual Report Vol.35 - 中研院物理研究所- Academia Sinica

II. Nuclear Physics Experimental
.
As for the high energy nuclear experiment, we participate at two international
projects: SPring-8 LEPS experiment (Fig. 2) and BNL PHENIX experiment (Fig. 3).
Photon beam with maximum energy up to 2.5 GeV can be generated from the
backward Compton-scattering of incident eV laser photons with 8 GeV electrons
circulating inside the storage rings of synchrotron facility, SPring-8 in Japan. We
study the mechanism of interactions between photon and quarks at a few GeV via the
reconstruction of γN→φN reaction. In year 2003, we published the first observation
of penta-quark state Θ + (1540) which decays into neutron and kaon. The following
confirmations by other experiments have triggered tremendous effort of studying
pentaquark experimentally and theoretically. In Brookhaven National Lab, U.S.,
RHIC collider can crate a collision of Au nuclei of center of mass energy to be 200
GeV. PHENIX experiment is capable of measuring the di-lepton and photon signal of
Quark Gluon Plasma. The experimental confirmation of QGP will greatly help the
understanding the effect of finite temperature and baryon density on QCD and also
the story of universe creation.
The newly-installed Oxford micro-beam system.
SPring-8 LEPS experiment
BNL PHENIX experiment
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