STATUS OF THE SIAM PHOTON LABORATORY

Abstract The Present status of the Siam Photon Laboratory is reported. The assembly of the accelerator complex with a 1 GeV storage ring has been completed. The commissioning of the accelerator complex has just started. However, there remain some problems to be solved. The work of conceptual design and the determination of the specifications of the undulator to be installed in the storage ring have been completed. The installation of the first two beam lines has started already. Other items such as the infrastructure reformation, the organization development, and the human resources development are also described

STATUS OF THE SIAM PHOTON LABORATORY

Abstract The Present status of the Siam Photon Laboratory is reported. The assembly of the accelerator complex with a 1 GeV storage ring has been completed. The commissioning of the accelerator complex has just started. However, there remain some problems to be solved. The work of conceptual design and the determination of the specifications of the undulator to be installed in the storage ring have been completed. The installation of the first two beam lines has started already. Other items such as the infrastructure reformation, the organization development, and the human resources development are also described

Inclusive neutron cross-sections at forward angles from Nb Nb and Au Au collisions at 800-MeV/nucleon

Inclusive neutron spectra were measured at 0°, 4°, 8°, 15°, 30°, and 42° from Nb-Nb and Au-Au collisions at 800 MeV/nucleon. A peak that originates from neutron evaporation from the projectile appears in the spectra at angles out to 8°. The shapes and magnitudes of the spectra are compared with those calculated from models of nucleus-nucleus collisions. The differential cross sections for Au-Au collisions are about four times those for Nb-Nb collisions. The predictions of the Vlasov-Uehling-Uhlenbeck (VUU) and QMD theories agree with the angular distributions of the differential cross sections except at small angles; the VUU prediction overestimates the angular distributions from a few degrees to about 20°, whereas the QMD prediction underestimates the angular distributions below 8°. The Firestreak model overestimates the angular distribution for Nb-Nb collisions and underestimates it for Au-Au collisions. Also, the VUU and QMD models agree with the measured double-differential cross sections in more angular and energy regions than the Firestreak and intranuclear cascade models; however, none of the models can account for the peaks at small angles (θ≤15°)