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| NA35 Collaboration | |
|---|---|
| Name | NA35 Collaboration |
| Formation | 1980s |
| Type | Scientific collaboration |
| Location | CERN |
| Fields | Particle physics, Nuclear physics |
| Key people | Helmut Appelshäuser, Jorgen Schukraft, Peter Braun-Munzinger, Johann Rafelski |
| Parent organization | European Organization for Nuclear Research |
NA35 Collaboration
The NA35 Collaboration was a multinational experimental physics collaboration based at CERN that conducted pioneering heavy-ion experiments at the Super Proton Synchrotron during the late 1980s and early 1990s. The collaboration brought together research groups from institutions such as CERN, the Institut für Kernphysik Darmstadt, the Niels Bohr Institute, and the Universität Heidelberg, aiming to study multiparticle production, strangeness enhancement, and collective phenomena in nucleus–nucleus collisions. Its work interfaced with contemporaneous programs at facilities including the Brookhaven National Laboratory and the GSI Helmholtz Centre for Heavy Ion Research.
NA35 formed in the mid-1980s as part of CERN’s fixed-target program at the Super Proton Synchrotron, building on precedents set by experiments like NA27 and NA34. The collaboration assembled experimentalists from dozens of institutions including University of Birmingham, Université de Paris-Sud, University of Wroclaw, and Saclay to exploit heavy-ion beams such as sulfur and oxygen at relativistic energies. Leadership included senior figures from Geneva and Heidelberg, and the group coordinated with accelerator operations teams at CERN and community stakeholders at meetings like the Quark Matter conference series.
The NA35 detector suite combined time-projection chambers, streamer chambers, and calorimetry elements adapted for heavy-ion work within the Super Proton Synchrotron fixed-target area. Tracking and particle-identification systems drew on technologies developed at CERN experimental labs and by detector groups from Darmstadt and NIKHEF. The collaboration used targets and beamlines prepared by the CERN PS and SPS accelerator divisions, and integrated electronics and data acquisition systems influenced by contemporaneous designs at Brookhaven National Laboratory and Fermilab. Support came from computing centers at CERN and regional universities such as University of Frankfurt.
NA35 aimed to characterize hadron production, study strangeness enhancement, measure baryon stopping, and search for signals of a deconfined quark–gluon plasma in nucleus–nucleus collisions. The collaboration coordinated analysis and theory comparisons with groups working on statistical models from University of Heidelberg, transport-model developers at GSI Helmholtz Centre for Heavy Ion Research, and lattice practitioners associated with Brookhaven National Laboratory. NA35 maintained links to experiment proposals and results from NA49 and to international theory forums including workshops at CERN and the International Conference on High Energy Physics.
Key data sets were collected using sulfur–uranium, sulfur–silver, sulfur–sulfur, and oxygen–gold collisions at SPS beam energies. Event samples included tens of thousands of central and peripheral collision triggers recorded with tracking chambers and particle-identification detectors. The collaboration performed systematic scans varying beam species and centrality, collaborating on trigger design with groups from University of Copenhagen and University of Warsaw. Data processing and Monte Carlo comparisons involved software efforts shared with NA49 colleagues and computing groups at CERN.
NA35 produced influential results reporting enhanced production of strange hadrons such as Lambda baryons and K mesons in heavy-ion collisions relative to nucleon–nucleon baselines, measurements of charged-particle rapidity distributions, and evidence for strong baryon stopping. Major papers from NA35 appeared in journals where authors included researchers from Heidelberg, Saclay, Warsaw, and Geneva, and were presented at conferences such as Quark Matter and the International Conference on High Energy Physics. The collaboration’s publications influenced statistical-thermal interpretations by theorists at University of Utrecht and CERN and were cited in comparative analyses with results from Brookhaven National Laboratory experiments.
The NA35 findings helped establish strangeness enhancement and collective features as key signatures in the emerging heavy-ion physics program, shaping experimental strategies at later facilities like the Relativistic Heavy Ion Collider and the Large Hadron Collider. By demonstrating the viability of multi-institution detector collaborations at the Super Proton Synchrotron, NA35 influenced the design and objectives of successor experiments such as NA49 and ALICE. The collaboration’s measurements provided benchmarks for transport models developed at GSI Helmholtz Centre for Heavy Ion Research and for thermal model analyses undertaken by groups at Universität Heidelberg and CERN.
Following NA35, many participating institutions and scientists transitioned to larger-scale projects such as NA49, ALICE, and experiments at Brookhaven National Laboratory including STAR. Methodological advances in detector design, event characterization, and analysis workflow contributed to the maturation of heavy-ion experimental practice across facilities like GSI Helmholtz Centre for Heavy Ion Research and CERN. Alumni of NA35 continued shaping programs in relativistic heavy-ion physics and in university groups at Heidelberg, Geneva, and Warsaw, ensuring that NA35’s datasets and publications remained reference points for comparisons with results from the Relativistic Heavy Ion Collider and the Large Hadron Collider.
Category:Particle physics experiments Category:CERN experiments Category:Heavy-ion collisions