Slow ramping of the CELSIUS storage ring has been utilized to measure the yield of charged pions in proton and heavy ion induced collisions with continuously varying beam energy. ...Boltzmann-Uehling-Uhlenbeck predictions, including Fermi momenta of nucleons
Recently the WA97 Collaboration has measured \(\mathrm{K}^0_{\mathrm{S}}\), \(\mathrm\Lambda\), \(\mathrm\Xi\), \(\mathrm\Omega\) and negative particle yields and transverse mass spectra at central ...rapidity in Pb–Pb and p–Pb collisions at 158 A GeV/c. These results are compared with the predictions of two of the most widely used event generators for heavy-ion collisions: VENUS 4.12 and RQMD 2.3. Both models predict that enhancements increase with the strangeness content of the particle. They fail, however, to reproduce completely the measured values of yields at central rapidity. In particular, for multistrange particles, VENUS fails to reproduce both the p–Pb and the Pb–Pb data, while RQMD works for p–Pb collisions but seems to be unable to reproduce the \(\mathrm\Omega\) data in Pb–Pb collisions. Moreover, the predicted behavior for strangeness production as a function of the centrality of the collision appears to be different from the observed behavior.
Charged particle production in central S-S collisions at 200 GeV/
c per nucleon has been studied by the WA94 experiment at the CERN-SPS. Particle identification has been provided by the Omega RICH, ...while a silicon telescope in the Omega spectrometer and an array of MultiWire Proportional Chambers have been used to trace particles through the RICH detector. Production ratios and transverse mass spectra for
π
±, K
± and
p(
p)
at central rapidity and
p
T
> 1.3 GeV/
c are presented.
Study of charged particle production using Omega RICH in WA94 experiment Abatzis, S; Andersen, E; Andrighetto, A ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/1996, Letnik:
371, Številka:
1
Journal Article
Recenzirano
We present preliminary results about charged particle production in SS collisions at 200 GeV/
c per nucleon, obtained by WA94 experiment at CERN-SPS. The particle identification has been provided by ...the Omega RICH; a silicon telescope and an array of multiwire proportional chambers (MWPC) have been used to track particles to the RICH detector. Details about particle tracking and identification procedure are also reported.
The structure of Ra-229 has been studied in the beta(-) decay of Fr-229. Spins and parities have been determined from the conversion electron measurements, while half-lives for the 137.5, 142.7, ...168.8, 213.0 and 479.0 keV levels have been measured in the
The fast timing beta gamma gamma(t) method has been used to measure lifetimes of the low-lying levels in Th-231 populated in the beta(-) decay of Ac-231. The half-life of the K-pi = 5/2(-) band-head ...at 185.7-keV was measured as T-1/2 = 1073(79) ps, yieldi
We present charged-particle multiplicities as a function of pseudorapidity and collision centrality for the 197Au+197Au reaction at square roots(NN) = 200 GeV. For the 5% most central events we ...obtain dN(ch)/deta/(eta = 0) = 625+/-55 and N(ch)/(-4.7< or =eta < or =4.7) = 4630 +/- 370, i.e., 14% and 21% increases, respectively, relative to square roots(NN) = 130 GeV collisions. Charged-particle production per pair of participant nucleons is found to increase from peripheral to central collisions around midrapidity. These results constrain current models of particle production at the highest RHIC energy.
