D. Keane

Radial flow in Au + Au collisions at E = (0.25-1.15)A GeV

A systematic study of energy spectra for light particles emitted at midrapidity from Au+Au collisions at {ital E}= (0.25--1.15){ital A} GeV reveals a significant nonthermal component consistent with a collective radial flow. This component is evaluated as a function of bombarding energy and event centrality. Comparisons to quantum molecular dynamics and Boltzmann-Uehling-Uhlenbeck models are made for different equations of state.

The energy dependence of flow in Ni induced collisions from 400A to 1970A MeV

We study the energy dependence of collective (hydrodynamic-like) nuclear matter flow in (400{endash}1970){ital A} MeV Ni+Au and (1000{endash}1970){ital A} MeV Ni+Cu reactions. The flow increases with energy, appears to reach a maximum, and then to decrease at higher energies. A way of comparing the energy dependence of flow values for different projectile-target mass combinations is introduced, which demonstrates a more-or-less common scaling behavior among flow values from different systems. {copyright} {ital 1997} {ital The American Physical Society}

Collective flow from the intranuclear cascade model

The phenomenon of collective flow in relativistic heavy ion collisions is studied using the hadronic cascade model ARC. Comparison is made to data for Au+Au at {ital p}=1.7 GeV/{ital c}, and for Ar+Pb at {ital p}=1.4 GeV/{ital c}. Collective flow is well described quantitatively without the need for explicit mean field terms to simulate the nuclear equation of state. Pion collective flow is in the opposite direction to nucleon flow, as is that of antinucleons and other produced particles. Pion and nucleon flow are predicted at BNL Alternating Gradient Synchrotron energies also, where, in light of the higher baryon densities achieved, we speculate that equation of state effects may be observable.

NEUTRAL STRANGE PARTICLE PRODUCTION AND FLOW AT AGS ENERGIES

In recent experiments at the AGS, the E895 Collaboration has made detailed measurements of neutral strange particles (K0s and ?) over a broad range of incident energies and impact parameters for the Au + Au system. Preliminary results are presented for the production yields and the sidewards flow of these particles. The production yields show relatively good agreement with existing systematics. The ? particles show flow results which are similar to those reported for protons, albeit with a smaller magnitude. On the other hand, the K0s seem to follow an anti-flow pattern suggesting that the kaon vector potential plays an important role in high-density nuclear matter.

PRODUCTION OF NEUTRONS FROM INTERACTIONS OF GCR-LIKE PARTICLES

In order to help assess the risk to astronauts due to the long-term exposure to the natural radiation environment in space, an understanding of how the primary radiation field is changed when passing through shielding and tissue materials must be obtained. One important aspect of the change in the primary radiation field after passing through shielding materials is the production of secondary particles from the breakup of the primary. Neutrons are an important component of the secondary particle field due to their relatively high biological weighting factors, and due to their relative abundance, especially behind thick shielding scenarios. Because of the complexity of the problem, the estimation of the risk from exposure to the secondary neutron field must be handled using calculational techniques. However, those calculations will need an extensive set of neutron cross section and thicktarget neutron yield data in order to make an accurate assessment of the risk. In this paper we briefly survey the existing neutron-production data sets that are applicable to the space radiation transport problem, and we point out how neutron production from protons is different than neutron production from heavy ions. We also make comparisons of one the heavy-ion data sets with Boltzmann-Uehling-Uhlenbeck (BUU) calculations.

Antiproton Production in p+A Collisions at 12.3 and 17.5 GeV/c

Inclusive and semi-inclusive measurements are presented for antiproton (

Pion yields and pion spectra from nuclear collisions

\bar{p}

Antinuclei in Heavy-Ion Collisions

) production in proton-nucleus collisions at the AGS. The inclusive yields per event increase strongly with increasing beam energy and decrease slightly with increasing target mass. The

Method for determining event-by-event elliptic flow fluctuations based on the first-order event plane in heavy-ion collisions

\bar{p}

The coexistence curve of finite charged nuclear matter

yield in 17.5 GeV/c p+Au collisions decreases with grey track multiplicity,