2009 Annual Report Vol.37 - 中研院物理研究所 - Academia Sinica

(5)Correlated hybrid fluctuations from inflation with thermal dissipation
(6)Off-equilibrium dynamics of the primordial perturbations in the inflationary
universe
C. Theoretical Nuclear Physics
(1)Cascade production in heavy-ion collisions at SIS energies
(2)Two-level model and magnetic field effects on the hysteresis in n-GaAs
(2). Experimental Nuclear Physics
We have an on-site facility of 3 MV (NEC 9SDH-2) tandem accelerator which
was installed in 1989. Since then the accelerator became an important facility for
experimental research in accelerator based atomic and applied physics. The
accelerator system has two negative ion sources, SNICS for solid source material and
Alphatross for noble gases Helium-3 and Helium-4, capable of producing a wide
range of ion beam species. The ion-beams for a given charged (q) state with a
maximum energy E = 3(q+1) MeV can be obtained and selected by an analyzing
magnet to meet experimental need. There are three beamlines available with different
scattering chambers for various research needs(i.e. ion-solid interaction, Rutherford
backscattering, Particle induced X-ray emission, ion irradiation, etc.), especially the
newly-installed Oxford micro-beam system (Fig. 1). We have made the accelerator
available for outside users. Every year a fraction of the machine time was provided to
people of domestic institutions such as Institute of Atomic and Molecular Sciences,
Academia Sinica, National Taiwan University and National Sun Yat-sen University.
.
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 non-perturbative interactions between photon and quarks at a few GeV
via the reconstruction of γN→φN reaction. In the future, we will produced solid
polarized HD target under the condition of 17-Tesla magnetic field and 15-mK low
temperature. With the usage of 2.5 GeV linearly polarized photon beam, double
polarization quantities will be measured for the investigation of strangeness content in
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