P.D. Bond

Backward angle heavy ion elastic on 40Ca and 58Ni

Abstract The excitation functions of elastic scattering at 180° for 16O + 40Ca and 12C + 40Ca are observed to oscillate between σ σ R = 10 −3 and 10−4 over a wide range of energies; the 16O + 58 Ni system shows a monotonic decrease to a value of σ σ R = 10 −5 over the energy range studied.

Results from the BNL E802 spectrometer for 14.5 GeV/c per nucleon silicon beams

We present selected results of measurements of inclusive ..pi.., K, proton, and deuteron spectra from 14.5 A GeV/c Si collisions with various targets. Results of neutral energy and charged particle dN/d/eta/ measurements are also discussed. Large K to ..pi.. ratios are observed in Si + Au collisions. Results are compared to the Lund-Fritiof model. 11 refs., 11 figs.

Antiproton production in 14.6 AGeVc Si+A collisions

Abstract Antiproton production cross sections have been measured for minimum bias and central Si+Al and Si+Au collisions at 14.6 A GeV c . The data presented cover the range of transverse momentum from 0.3 to 1.2 GeV c and lab rapidities from 1.1 to 1.7 units. The relative p π − and p K − yields are found to be the smallest for the heaviest system measured, central Si+Au collisions. For these collisions, the p π − ratio, determined from integrated yields for 1.1⩽y⩽1.7, is (0.84±0.07)×10−3. In the same rapidity interval, the average antiproton inverse m⊥ slope is 141±14 MeV for central Si+Al and central Si+Au collisions.

Mutual inelastic excitation of 28Si+60Ni

Abstract Mutual excitation of projectile and target has been measured for 28 Si+ 60 Ni scattering. A coupled channels analysis of the angular distribution is in good agreement with the data and is used to demonstrate the important interference of Coulomb and nuclear amplitudes in both simultaneous and sequential excitation.

Centrality dependence of K+ and π+ multiplicities from Si + A collisions at 14.6 A GeV/c☆

Abstract K + and π + multiplicities have been measured in magnetic spectrometer for Si++ Al, Si+ Cu and Si + Au collisions at 14.6 A GeV/ c incident momentum. The multiplicities were obtained for five different windows of forward kinetic energy as detected in a zero degree calorimeter. The K + / π + multiplicity ratio ranges from ≈9% in peripheral interactions to 19% in central Si+Au. The largest K + / π + ratios are observed for those events for each target that leave the least energy in the zero degree calorimeter and the ratio increases with target mass. The observations suggest that multiple interactions are important in the particle production mechanism.

Excited states in 196Os and the structure of the PtOs transition region

Abstract The 198 Pt( 14 C, 16 O) 196 Os reaction has been used to obtain the first evidence for excited states in 196 Os, in groups at excitation energies of 300 and 760 keV. The implications of these results for the structural evolution of the OsPt transition region are discussed. In addition, the first direct determination of the 196 Os ground-state mass is reported.

Inelastic scattering of 13C from 40Ca and the L = 1 problem☆

Abstract Inelastic scattering to the first 3 − , 2 + and 5 − states of 40 Ca has been measured with a 68 MeV 13 C beam. These data indicate that a recent theoretical attempt to reproduce the anomalous L =1 angular distribution in the 40 Ca( 13 C, 14 N) 39 K reaction with a coupled channels calculation overestimates the inelastic scattering to the 3 − and 5 − states in 40 Ca by factors of 2.4 and 5, respectively.

90° excitation functions for elastic scattering of 28Si+16O and 28Si+12C☆

Abstract The gross structures in the excitation functions for elastic scattering of 28 Si+ 16 O and 28 Si+ 12 C, measured at 90°, where only even partial waves contribute, are found to be anti-correlated with those at 180°. Excitation functions at both angles, including the enhanced gross structure at 180°, can be reproduced by calculations using a potential which attracts odd partial waves more than even partial waves.

Intermittency in central collisions of 16O+A at 14.6A GeV/c☆

Abstract Fluctuations in pseudorapidity distributions of charged particles from central collisions of 16 O+Al and 16 O+Cu at 14.6 A GeV/ c are analyzed using scaled factorial moments. A power-law growth of moments with decreasing bin size is observed down to δη ∼ 0.1. About half the measured signal remains after making corrections based on Monte Carlo calculations with Fritiof and GEANT which include γ-conversions, Dalitz decays and detector effects.

Bose-Einstein correlations in 14.6 A · GeV/c 28Si + A collisions

Abstract The E802 spectrometer at the Brookhaven AGS has been used to obtain two-particle inclusive pion distributions from E / A = 14.6 GeV 28 Si + 197 Au arid 27 A1 interactions. Data are presented for pions near center-of-mass rapidity, in the nucleon-nucleon frame, from central events. We present preliminary results for source distribution parameters obtained by fitting the two-particle correlation function. The potential for studying kaon correlations in the E802 apparatus is also discussed.