Archives of NA38, NA50, NA51 Experiments

Identity Statement [Top]

Reference code(s)



Archives of NA38, NA50, NA51 Experiments


August 1972 – August 2003

Level of description


Extent of the unit of description

96 items, 4 linear metres, 36 boxes

Context [Top]

Name of creator

Louis Kluberg, spokesman of NA38, NA50 and NA51 Experiments

Administrative history

Experiment NA38, also named Ions/Dimuons Collaboration

The proposal was submitted to the Super Proton Synchrotron and Low Energy Antiproton Ring Committee (SPSLC) on 11 March 1985 and approved 12 September 1985. See the proposal CERN-SPS-85-20; SPSC-P-211 

This experiment is a study of High-Energy Nucleus-Nucleus interactions with the enlarged NA10 dimuon spectrometer.

NA38 aimed to detect evidence for the quark-gluon plasma produced in collisions of ultrarelativistic ions on heavy nuclear targets. Signatures studied were thermal muon pairs in the 1-3 GeV/c**2 mass range, suppressed J/psi production, and enhanced phi and omega production.

The NA38 experiment finished 12 September 1995.

Contributing institutes to the NA38 Experiment:
CERN – Annecy LAPP – Clermont-Ferrand Univ. – Lisbon LIP – Univ. Lyon I (IPNL) – Orsay IPN – Palaiseau Ecole Polytechnique – Strasbourg CRN/ULP

Source :


Experiment NA50, also named Dimuons Collaboration

The proposal was submitted to the SPS and LEAR Committee 6 November 1991 and approved 6 February 1992. See the proposal CERN-SPSLC-91-55; SPSLC-P-265-Rev  

This experiment studied muon pairs and vector mesons produced in High Energy Pb-Pb interactions.

NA50 studied dimuons produced in Pb-Pb collisions at the nucleon-nucleon c.m. energy of 18 GeV. The setup was optimized for a mass range that includes signals probing QGP (Quark and Gluon Plasma), namely phi, J/psi, psi', and (unseparated) rho and omega vector mesons. It also covered Drell-Yan dimuons which serve as a normalization. The detector was an improved version of the NA38 setup, with neutral energy and multiplicity detectors following the target, the Zero Degrees quartz fiber hadron calorimeter (ZDC) embedded in the hadron dump, and a muon spectrometer following the dump.

The NA50 experiment finished 29 November 2011.

Contributing institutes to the NA50 Experiment:
CERN - Annecy LAPP - Inst.for Atomic Physics, Bucharest - Cagliari Univ./INFN - LPC, Univ. Clermont-Ferrand/CNRS-IN2P3 – Lisbon LIP – Moscow, Inst. Nucl. Research - INP, Univ. Paris-Sud/CNRS-IN2P3, Orsay – LPNHE, Ecole Poly/CNRS-IN2P3, Palaseau – CRN, CNRS-IN2P3/Univ. Strasbourg – Torino Univ./INFN – IPN, Univ. Lyon/CNRS-IN2P3, Villeurbanne



Experiment NA51, also named DYSSIS Collaboration

The proposal was submitted to the SPS and LEAR Committee 16 March 1992 and approved 16 April 1992. See the proposal CERN-SPSLC-92-15; SPSLC-P-267 

This experiment is a Drell-Yan Study of Sea Isospin Symmetry.

The experiment studied the isospin symmetry in the light-quark sea of the proton. Its violation is one possible explanation of unexpected muon deep inelastic scattering experimental results which disagree with the Gottfried sum rule. The experiment used the large acceptance muon spectrometer used previously by CERN-NA-010 and CERN-NA-038. It detects muon pairs produced by the Drell-Yan mechanism in p-p and p-d reactions. A beam of 450 GeV/c protons impinges on alternating liquid hydrogen and deuterium targets. The aim is to measure the cross-section ratio at dimuon masses above 4 GeV/c**2, which is a sensitive probe of the relative content of light antiquarks u-bar and d-bar in the proton sea.

The NA51 experiment finished 16 April 2002.

Contributing institutes to the NA51 Experiment:
CERN - LPC, Univ. Clermont-Ferrand/CNRS-IN2P3 – Lisbon LIP – INP, Univ. Paris-Sud/CNRS-IN2P3, Orsay – LPNHE, Ecole Poly/CNRS-IN2P3, Palaiseau – CRN, CNRS-IN2P3/Univ. Strasbourg – Torino Univ./INFN – IPN, Univ. Lyon/CNRS-IN2P3, Villeurbanne

Source :

* Source : List of all experiments approved since 1974, CERN Experiments 1974

Immediate source of acquisition or transfer

Louis Kluberg, received 29 October 2009

Content & Structure [Top]

Scope and content

This collection contains Louis Kluberg’s folders from the period 1972-2003. It contains documents about exploitation (calculations, design studies, check papers, technical specifications, reports, results, notes) and publications (including preprints, presscuttings, conferences and presentations) of NA38, NA50, and NA51 experiments. It also contains memoranda, correspondences, logbooks, drawings, and minutes of weekly meetings.

Appraisal, destruction and scheduling information

One folder about shifts (rotas) was destroyed.


No further accruals are expected.

System of arrangement

CERN-ARCH-NA-EXP-01-001 to 030 NA38 Experiment
CERN-ARCH-NA-EXP-02-001 to 029 NA50 Experiment
CERN-ARCH-NA-EXP-03-001 NA51 Experiment
CERN-ARCH-NA-EXP-04-001 to 036 NA38, NA50 and NA51 Experiments


Conditions of access and use [Top]

Conditions governing access

See file level description and the CERN operational circular No 3: rules applicable to archival material and archiving at CERN. In general, records on any subject that are over 30 years old, and all records of a purely scientific nature, may be consulted.

Conditions governing reproduction

Copyright is retained by CERN, no reproduction without permission.

Language / scripts of material

Most of the material is written in English or French.

Finding aids

Listed to file level in the CERN Archives Database.

Description control [Top]

Archivist's note

Description prepared by Célestine Nguyen and Sandrine Reyes

Date(s) of description

Geneva, the 10th October 2016, revised in June 2020