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°)

(d,n) Reaction Studies at 80 MeV

This research was sponsored by the National Science Foundation Grant NSF PHy 87-1440

Three-Nucleon Force Effects in Nucleon Induced Deuteron Breakup: Comparison to Data (II)

Selected Nd breakup data over a wide energy range are compared to solutions of Faddeev equations based on modern high precision NN interactions alone and adding current three-nucleon force models. Unfortunately currently available data probe phase space regions for the final three nucleon momenta which are rather insensitive to 3NF effects as predicted by current models. Overall there is good to fair agreement between present day theory and experiment but also some cases exist with striking discrepancies. Regions in the phase space are suggested where large 3NF effects can be expected.Comment: 33 pages, 24 ps figures, 9 gif figure

Performance of Large-Volume Mean-Timed Neutron Detectors

This work was supported by the National Science Foundation Grant NSF PHY 81-14339 and by Indiana Universit

The 39-K(p,n)39-Ca Reaction

This research was sponsored by the National Science Foundation Grant NSF PHY 87-1440

The Gamow-Teller Strength Distribution in 208-Bi -- A Probe of the Charge Distribution in 208-Pb?

This work was supported by the National Science Foundation Grant NSF PHY 81-14339 and by Indiana Universit

The O+ to O- Transition in the 16-O(p,n)16-F Reaction at 80 MeV

This research was sponsored by the National Science Foundation Grant NSF PHY 87-1440