I. Ropotar

article

Results from the NA50 experiment on J/Ψ suppression in Pb Pb collisions at the CERN SPS

M. Monteno, M.C. Abreu, B. Alessandro, C. Alexa, more

Nuclear Physics B (Proceedings Supplements) > 2001 > 92 > 1-3 > 43-54

The NA50 experiment has measured, at the CERN SPS, the dimuon production in Pb Pb collisions at 158 GeV/c per nucleon, following the program of the previous NA38 and NA51 experiments, performed with proton and light ion beams. The J/Ψ production has been studied by NA50 as a function of the centrality of the collisions. The results of the analyses performed on three data samples, collected from 1995...

article

Transverse flow in heavy ion interactions at the CERN SPS

P. Saturnini, M.C. Abreu, B. Alessandro, C. Alexa, more

Nuclear Physics B (Proceedings Supplements) > 2001 > 92 > 1-3 > 55-61

In the search for the quark-gluon plasma at CERN SPS, several signals were observed suggesting that this new state of matter was actually produced in the interactions induced by the lead beam at 158A GeV. The transverse flow phenomena characterize the distribution of the particles in the final state of the collision, and are expected to provide some indications about the initial state. More precisly,...

article

Transverse momentum distributions of J/ψ, ψ′, Drell–Yan and continuum dimuons produced in Pb–Pb interactions at the SPS

M.C Abreu, B Alessandro, C Alexa, R Arnaldi, more

Physics Letters B > 2001 > 499 > 1-2 > 85-96

Muon pairs produced in Pb–Pb interactions at 158 GeV/c per nucleon are used to study the transverse momentum distributions of the J/ψ, ψ′ and dimuons in the mass continuum. In particular, the dependence of these distributions on the centrality of the Pb–Pb collision is investigated in detail.

article

Evidence for deconfinement of quarks and gluons from the J/ψ suppression pattern measured in Pb-Pb collisions at the CERN-SPS

NA50 Collaboration, M.C. Abreu, B. Alessandro, C. Alexa, more

Physics Letters B > 2000 > 477 > 1-3 > 28-36

The analysis of the data collected by the NA50 experiment in 1998, reported in this paper, extends and clarifies the pattern of the previously observed J/ψ anomalous suppression. This new measurement, besides providing a deeper understanding of the previous observations, reveals a steady significative decrease in the J/ψ production rate up to the most central Pb-Pb collisions. It clearly rules out...

article

Charmonium production in Pb−Pb collisions

Nora De Marco, M.C. Abreu, B. Alessandro, C. Alexa, more

Nuclear Physics, Section A > 2000 > 663-664 > Complete > 765c-768c

article

Strangeness measurements in NA50 experiment with Pb projectiles

M.C. Abreu, B. Alessandro, C. Alexa, R. Arnaldi, more

Nuclear Physics, Section A > 2000 > 663-664 > Complete > 721c-724c

Low mass dimuons production has been studied in Pb-Pb collisions at 158 GeV/A . φ, ρ and ω contributions are extracted in different transverse mass and transverse energy domains. Preliminary results of the 1996 run display an increase of the φ/(ρ+ω) ratio, coming from an increase of the φ. Cross sections are presented and temperatures extracted.

article

The elliptic flow of neutral transverse energy in heavy ion interactions at SPS energies

NA50 Collaboration, Pierre Saturnini, M.C. Abreu, B. Alessandro, more

Nuclear Physics, Section A > 1999 > 661 > 1-4 > 345-348

The threshold effect in the J/ψ suppression seen in the NA50 data in lead on lead interactions at the CERN SPS [1,2] can't be taken into account by conventional models. Other candidate models [3] use a phase transition, and therefore let suppose that the thermodynamic variables are defined everywhere that is the so-called thermalization. The in-plane elliptic flow, which has been proposed [4] in order...

article

Fission of Lead Projectiles in Pb-Nucleus Collisions at the SPS

M.C. Abreu, B. Alessandro, C. Alexa, R. Arnaldi, more

Nuclear Physics, Section A > 1999 > 661 > 1-4 > 321c-324c

article

Latest Results from NA50 on J/ψ Suppression in Pb-Pb Collisions

Corrado Cicalò, M.C. Abreu, B. Alessandro, C. Alexa, more

Nuclear Physics, Section A > 1999 > 661 > 1-4 > 93c-103c

The main goal of the NA50 experiment is to study the J/ψ suppression pattern in Pb-Pb interactions, at 158 GeV/c per nucleon at the CERN SPS. We present here the results from the 1996 (final) and 1998 (preliminary) data taking periods. They confirm and extend our previous observation that the J/ψ is anomalously suppressed from peripheral to central collisions. With new event selection procedures...

article

Dimuon enhancement in nucleus-nucleus ultrarelativistic interactions

Paula Bordalo, M.C. Abreu, B. Alessandro, C. Alexa, more

Nuclear Physics, Section A > 1999 > 661 > 1-4 > 538c-541c

article

The elliptic flow of neutral transverse energy in heavy ion interactions at SPS energies

Pierre Saturnini, M.C. Abreu, B. Alessandro, C. Alexa, more

Nuclear Physics, Section A > 1999 > 661 > 1-4 > 345c-348c

article

Latest results from NA50 on J/ψ suppression in Pb-Pb collisions

Corrado Cicalò, M.C. Abreu, B. Alessandro, C. Alexa, more

Nuclear Physics, Section A > 1999 > 661 > 1-4 > 93-103

The main goal of the NA50 experiment is to study the J/ψ suppression pattern in Pb-Pb interactions, at 158 GeV/c per nucleon at the CERN SPS. We present here the results from the 1996 (final) and 1998 (preliminary) data taking periods. They confirm and extend our previous observation that the J/ψ is anomalously suppressed from peripheral to central collisions. With new event selection procedures and...

article

φ, ρ and ω production in Pb-Pb collisions at 158 GeV/c ² per nucleon

Nicole Willis, M.C. Abreu, B. Alessandro, C. Alexa, more

Nuclear Physics, Section A > 1999 > 661 > 1-4 > 534c-537c

article

Dimuon enhancement in nucleus-nucleus ultrarelativistic interactions

NA38/NA50 Collaboration, Paula Bordalo, M.C. Abreu, B. Alessandro, more

Nuclear Physics, Section A > 1999 > 661 > 1-4 > 538-541

The study of muon pairs in the mass region 1.5 < M _μ _μ < 2.5 GeV/c ² in 450 GeV/c p-A, 200 GeV/nucleon S-U and 158 GeV/nucleon Pb-Pb collisions is presented. In p-A interactions, the dimuon signal mass spectra are well described by a superposition of Drell-Yan and charmed meson semi-leptonic decay contributions, in agreement with previous experiments when considering a linear...

article

φ, ρ and ω production in Pb-Pb collisions at 158 GeV/c ² per nucleon

Nicole Willis, M.C. Abreau, B. Alessandro, C. Alexa, more

Nuclear Physics, Section A > 1999 > 661 > 1-4 > 534-537

article

Fission of lead projectiles in Pb-nucleus collisions at the SPS

M.C. Abreu, B. Alessandro, C. Alexa, R. Arnaldi, more

Nuclear Physics, Section A > 1999 > 661 > 1-4 > 321-324

article

Observation of a threshold effect in the anomalous J/ψ suppression

NA50 Collaboration, M.C. Abreu, B. Alessandro, C. Alexa, more

Physics Letters B > 1999 > 450 > 4 > 456-466

We report on a search for a phase transition from ordinary nuclear matter to a state of deconfined quarks and gluons as predicted by lattice QCD calculations. A new measurement of charmonium production in Pb-Pb interactions at 158 GeV/c per nucleon agrees with our previous results and confirms the anomalous J/ψ suppression we had already observed on a significantly smaller data sample. New event selection...

article

Gallium arsenide pixel detectors

RD8 Collaboration, R. Bates, M. Campbell, E. Cantatore, more

Nuclear Inst. and Methods in Physics Research, A > 1998 > 410 > 1 > 6-11

GaAs detectors can be fabricated with bidimensional single-sided electrode segmentation. They have been successfully bonded using flip-chip technology to the Omega-3 silicon read-out chip. We present here the design features of the GaAs pixel detectors and results from a test performed at the CERN SpS with a 120 GeV π ^- beam. The detection efficiency was 99.2% with a nominal threshold of...

article

Uniformity of response of the LHC1 large area pixel detector system

CERN Detector R&D Collaboration RD19 and Experiment WA97, E. Cantatore, F. Antinori, K.H. Becks, more

Nuclear Inst. and Methods in Physics Research, A > 1998 > 409 > 1-3 > 119-128

The uniformity of discriminator threshold and the precision of internal delay have been studied on single 'Omega3/LHC1' pixel readout chips and on arrays of 24 chips containing 48 768 active pixels. On single chips we measured a threshold variation of 400e ^- r.m.s. for a mean threshold setting of 4000e ^- . The internal delay distribution shows a standard deviation of 6 ns on a single...

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Search results for: I. Ropotar

Results from the NA50 experiment on J/Ψ suppression in Pb Pb collisions at the CERN SPS

Transverse flow in heavy ion interactions at the CERN SPS

Transverse momentum distributions of J/ψ, ψ′, Drell–Yan and continuum dimuons produced in Pb–Pb interactions at the SPS

Evidence for deconfinement of quarks and gluons from the J/ψ suppression pattern measured in Pb-Pb collisions at the CERN-SPS

Charmonium production in Pb−Pb collisions

Strangeness measurements in NA50 experiment with Pb projectiles

The elliptic flow of neutral transverse energy in heavy ion interactions at SPS energies

Fission of Lead Projectiles in Pb-Nucleus Collisions at the SPS

Latest Results from NA50 on J/ψ Suppression in Pb-Pb Collisions

Dimuon enhancement in nucleus-nucleus ultrarelativistic interactions

The elliptic flow of neutral transverse energy in heavy ion interactions at SPS energies

Latest results from NA50 on J/ψ suppression in Pb-Pb collisions

φ, ρ and ω production in Pb-Pb collisions at 158 GeV/c ² per nucleon

Dimuon enhancement in nucleus-nucleus ultrarelativistic interactions

φ, ρ and ω production in Pb-Pb collisions at 158 GeV/c ² per nucleon

Fission of lead projectiles in Pb-nucleus collisions at the SPS

Observation of a threshold effect in the anomalous J/ψ suppression

Gallium arsenide pixel detectors

Uniformity of response of the LHC1 large area pixel detector system

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