K. Kitamura

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.

Recent results from E802 and E859

Abstract Recent single-particle inclusive measurements and two-particle correlation data from E802 and its succesor, E859, are presented. The K + / π + ratio observed for collisions of 14.6 A·GeV 28 Si ions on various targets is presented as a function of both forward and transverse energy. Source sizes are determined via interferometry using π + , π − , K + and proton pairs.

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.

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.

Proton production from Si+Au collisions at 14.5 A-GeV

Abstract Recent results are presented from the study of central Si+Au → p+X, Si+Au → π±+X, and Si+Cu → p+X at 14.5 A.GeV. The distribution of protons in rapidity indicates that many target protons are found above 0.5 units. The variation of the slope parameter in rapidity is consistent with a thermal source of protons at the geometric center-of-mass rapidity.

Particle production in pA and AA collisions at AGS

Production of light particles (π±,K±,p) has been measured in both Si+A and p+A collisions. Several interesting features have been observed, among which are: the enhanced K+/π+ ratio and the larger 〈mt〉 for K+ and proton. Comparisons between ≊pp, pA and SiA collisions are discussed.

Particle spectra near mid-rapidity studied with Cherenkov-complex system in 14.5 AGEV SI + AU collisions

Abstract The Cherenkov Complex system (CC-system) in the E-802 experiment at AGS was successfully operated in the heavy ion running at AGS. Brief description of the system is given. Preliminarily obtained particle spectra for pions, Kaons, and protons near mid-rapidity region in 14.5 A.GeV Si + Au collisions are presented. The spectra shape and the relative yields are compared with those in p + ‘N’ and p + Au collisions.

Spectrometer results from BNL E802

Measurements of collisions of 14.5 GeV/c per nucleon 28Si ions with nuclear targets using the BNL E802 spectrometer are presented. A description of the experiment and preliminary particle ratios are discussed.