W. J. Willis

Publication List Details

Period

1986 - 2007

Number

134

Co-Authors

GEM operation in helium and neon at low temperatures (2005)

Buzulutskov, A., Dodd, J., Galea, R., Ju, Y., Leltchouk, M., Rehak, P., ...

We study the performance of Gas Electron Multipliers (GEMs) in gaseous He, Ne and Ne+H2 at temperatures in the range of 2.6-293 K. In He, at temperatures between 62 and 293 K, the triple-GEM...

High transverse mass pion and proton correlations in central PbPb collisions at 17GeV/nucleon (2003)

Bearden, I G, Bøggild, H, Boissevain, J G, Christiansen, P H L, Conin, L, Dodd, J, ...

For central PbPb collisions at a center of mass energy of 17.3 GeV/nucleon we have made the first two-dimensional measurement of the pp correlation function. These data extend the range of previous...

High transverse mass pion and proton correlations in central PbPb collisions at 17GeV/nucleon (2003)

Bearden, I G, Bøggild, H, Boissevain, J G, Christiansen, P H L, Conin, L, Dodd, J, ...

For central PbPb collisions at a center of mass energy of 17.3 GeV/nucleon we have made the first two-dimensional measurement of the pp correlation function. These data extend the range of previous...

Performance of the ATLAS Electromagnetic Calorimeter End-cap Module 0 (2003)

Aubert, Bernard, Abouelouafa, M, Alexa, C, Astesan, F, Augé, E, Aulchenko, V M, ...

The construction and beam test results of the ATLAS electromagnetic end-cap calorimeter pre-production module 0 are presented. The stochastic term of the energy resolution is between 10% GeV^1/2 and...

Performance of the ATLAS electromagnetic calorimeter barrel module 0 (2003)

Aubert, Bernard, Abouelouafa, M, Alexa, C, Astesan, F, Augé, E, Aulchenko, V M, ...

The construction and performance of the barrel pre-series module 0 of the future ATLAS electromagnetic calorimeter at the LHC is described. The signal reconstruction and performance of ATLAS-like...

One and two dimensional analysis of 3$\pi$ correlations measured in Pb+Pb interactions (2001)

Bearden, I G, Bøggild, H, Boissevain, J G, Christiansen, P, Conin, L, Dodd, J, ...

$\pi^{-}\pi^{-}\pi^{-}$ correlations from Pb+Pb collisions at 158 GeV/c per nucleon are presented as measured by the focusing spectrometer of the NA44 experiment at CERN. The three-body effect is...

Strange Meson Enhancement in Pb-Pb Collisions (1999)

Bearden, I G, Bøggild, H, Boissevain, J G, Conin, L, Dodd, J, Erazmus, B, ...

The NA44 Collaboration has measured yields and differential distributions of K+, K-, pi+, pi- in transverse kinetic energy and rapidity, around the center-of-mass rapidity in 158 A GeV/c Pb+Pb...

Three pion correlations in sulphur-lead collisions at the CERN SPS (1999)

Bøggild, H, Boissevain, J G, Dodd, J, Esumi, S C, Fabjan, Christian Wolfgang, Ferenc, D, ...

$\pi^+\pi^+\pi^+$ correlations from Sulphur-Lead collisions at 200~GeV/$c$ per nucleon are presented as measured by the focusing spectrometer of experiment NA44 at CERN. We have investigated the...

Two-Proton Correlations near Midrapidity in $p+Pb$ and $S+Pb$ Collisions at the CERN SPS (1998)

Bøggild, H, Boissevain, J G, Conin, L, Dodd, J, Erazmus, B, Esumi, S C, ...

Correlations of two protons emitted near midrapidity in $p+Pb$ collisions at 450 GeV/$c$ and $S+Pb$ collisions at 200$A$ GeV/$c$ are presented, as measured by the NA44 Experiment. The correlation...

High energy Pb + Pb collisions viewed by pion interferometry (1998)

Bearden, I G, Bøggild, H, Boissevain, J G, Dodd, J, Erazmus, B, Esumi, S C, ...

Two-pion correlations from Pb+Pb collisions at 158 GeV/$c$ per nucleon are measured by the NA44 experiment at CERN. Multidimensional fits characterize the emission volume, which is found to be larger...

Proton and Antiproton Distributions at Mid-Rapidity in Proton-Nucleus and Sulphur-Nucleus Collisions (1997)

Wolf, K, Bearden, I G, Bøggild, H, Boissevain, J G, Dodd, J, Esumi, S C, ...

Experiment NA44 has measured proton and antiproton distributions at mid-rapidity in sulphur and proton collisions with nuclear targets at 200 and 450 GeV/c per nucleon respectively. The inverse...

Multiplicity dependence of the pion source in S+A collisions at the CERN SPS (1997)

Kaimi, K, Bøggild, H, Boissevain, J G, Cherney, M, Dodd, J R, Esumi, S C, ...

The emission of pions from relativistic heavy-ion collisions of S+S, S+Ag and S+Pb at 200 GeV/nucleon is characterized using two-particle interferometry. The multiplicity dependence of the pion...

Collective expansion in high energy heavy ion collisions (1996)

Bearden, I G, Bøggild, H, Boissevain, J G, Dodd, J, Erazmus, B, Esumi, S C, ...

Transverse mass spectra of pions, kaons, and protons from the symmetric heavy-ion collisions 200A$\cdot$GeV S+S and 158A$\cdot$GeV Pb+Pb, measured in the NA44 focusing spectrometer at CERN, are...

Mid-Rapidity Protons in 158A$\cdot$GeV Pb + Pb Collisions (1996)

Bearden, I G, Bøggild, H, Boissevain, J G, Dodd, J, Erazmus, B, Esumi, S C, ...

Proton distributions at mid-rapidity (2 $\le y \le$ 3) have been measured for 158A$\cdot$GeV Pb + Pb collisions in the focusing spectrometer experiment NA44 at CERN. From baryon number conservation...

A study of electron-muon pair production in 450 GeV/c pBe collisions (1996)

Åkesson, T, Almehed, S, Angelis, Aris L S, Antos, J, Atherton, Henry W, Aubry, P, ...

We report on the production of $e^{\pm}\mu^{\mp}$ pairs in $450\GeVc$ {\em pBe} collisions at the CERN SPS. The $e\mu$ signal, which has average missing energy of 21~GeV, is shown to be consistent...

Coulomb effect in single-particle distributions (1996)

Bøggild, H, Boissevain, J G, Dodd, J, Erazmus, B, Esumi, S C, Fabjan, Christian Wolfgang, ...

Single-particle distributions from heavy-ion collisions show the effect of Coulomb interactions on the final state. While a rather strong effect is seen in the ratio pi - / pi+ from central...

The AFS hadron calorimeter at the CERN ISR (1990)

Botner, O, Dagan, S, Fabjan, Christian Wolfgang, Gordon, H, Jeffreys, P, Kesseler, G, ...

The hadron calorimeter for the AFS experiment at CERN consists of a fine sampling uranium/copper scintillator sandwich. It is designed for high modularity and will provide azimuthal coverage over 8...

Performance of the AFS-vertex detector at the CERN ISR (1990)

Cockerill, D J A, Fabjan, Christian Wolfgang, Frandsen, Poul Kjaer, Hallgren, A, Heck, B, Hilke, Hans Jürgen, ...

The central detector of the Axial Field Spectrometer (AFS) is a cylindrical drift chamber using a 'bicycle-wheel' geometry. Its design has been optimized for jet-like events with high track...