H. Piekarz

Hadron and Electron Response of Uranium Liquid Argon Calorimeter Modules for the D0 Detector

We present the results of tests made on two types of uranium/liquid argon calorimeter modules, one electromagnetic and one hadronic, constructed for the D0 detector at the Fermilab Tevatron Collider. For electrons and hadrons with energies between 10 and 150 GeV, we present measurements of energy resolution, linearity of response, electromagnetic to hadronic response ratio (e/π), and longitudinal hadronic shower development. We have also investigated the effects of adding small amounts of methane to the liquid argon.

Design, construction, and performance of the electromagnetic module of the DØ end calorimeter

Author(s): Aihara, H.; Arthur, A.A.; Dahl, O.I.; Eberhard, P.H.; Edwards, W.R.; Fulton, R.L.; Haughian, J.M.; Madaras, R.J.; Roe, N.A.; Shuman, D.B.; Spadafora, A.L.; Stevenson, M.L.; Taylor, J.D.; Wenzel, W.A.

Transition radiation detector in the D0 colliding beam experiment at Fermilab

The construction, operation and response of the Transition Radiation Detector (TRD) at DO colliding beam experiment at Fermilab are presented. The use of the TRD signal to enhance electron identification and hadronic rejection in the multiparticle background characteristic for the antiproton-proton interactions at the center-of-mass energy of 1.8 TeV is also described and results are discussed.

Search for dibaryons in reactions of K− mesons with deuterium and 3He nuclei at 0.87 GeV/c

The reactions K−d→π−X+, K− 3He→π+nX0, and K− 3He→π+pX− at 0.87 GeV/c were studied using missing mass magnetic spectrometer. The X stands for a two-baryon, strangeness −1 resonant system. In order to enhance p-wave production of a dibaryon state all reactions were studied at large scattering angles; 10° to 26° for deuterium target, and 20° for 3He one. After known backgrounds were reproduced an excess of events is observed in all three reactions. The mass distribution and the final state particles associated with the excess events suggest compatibility of these events with expectations for two-baryon resonant state decays.

Cryogenic Design Considerations of Solid Argon Calorimeters and Performance of a Solid Argon Test Cell

This paper presents the cryogenic design and discusses the operation of a small test cell with a 20.6 L cryostat, built to demonstrate the feasibility of Solid Argon Calorimeters (SAC) for possible use in high energy physics experiments. In addition, design considerations for a large SAC are described. The test cell froze argon in a solid block around the particle detector assembly reaching temperatures more than 6 K below the argon freezing temperature. Aspects of the test cell design can be used for a large SAC including the use of two liquid nitrogen cooling circuits; one for condensing argon gas and controlling the argon pressure, another for freezing the argon around the detector assembly with gravity fed liquid nitrogen at 77 K. An insulated open-top box surrounding the detector assembly separated the solid argon from warmer liquid argon restricting the growth of the solid argon. A generalized look is taken at the heat transfer problems of a SAC.