No abstract available

[en] Electromagnetic calorimeters with noble liquids and their limits in resolution are discussed. The origins of 'initial' current measurement in calorimetry are retracted and the performance and first results of the NA48 calorimeter (quasi-homogeneous calorimeter with longitudinal electrode structures) are presented. Results of the prototype calorimeters of KEDR (quasi-homogenous calorimeter with transverse electrode structure) and of ATLAS (sampling calorimeter with longitudinal electrode structure), are summarized. (author)

[en] A large acceptance and high efficiency neutron detector is described. The sensitive area and volume of the detector is 3.07 m² and 1.03 m³ respectively. The detector consists of sixteen elements of plastic scintillator, each having the dimensions (16 x 16 x 240) cm³. The mean detection efficiency is about 33% for neutrons of 100-500 MeV/c momentum. An interesting feature of this instrument is the accuracy achieved in locating incident particles, which is +-3 cm for charged particles and +-4 cm for neutrons. The accuracy achieved for the time-of-flight measurement is +-1 nsec for fast neutrons. (orig.)

No abstract available

[en] Electron attaching impurities in the liquids TMS (tetramethylsilane) and TMP (2,2,4,4 tetramethylpentane) have been removed to a high degree with efficient and fast purification methods. Free electron lifetimes of 450 and 77 μs have been measured for the two liquids respectively. (orig.)

[en] Two possible room-temperature liquids suitable for calorimetry, tetramethylsilane (TMS) and (2, 2, 4, 4) tetramethylpentane (TMP) were irradiated with γ-radiation of a ⁶⁰Co source up to doses of 1 Mrad and 10 Mrad, respectively. Electron lifetime and mobility of positive ions were measured as a function of radiation dose at two different dose rates. The liquid samples were kept in sealed ionization chambers made of stainless steel and ceramic. A decrease of electron lifetime with increasing dose was observed, which is attributed to the formation of compounds with double bonds. In TMP the positive ion mobility changed with irradiation, probably owing to the formation of high-molecular-weight compounds. (orig.)

[en] The construction of drift chambers for the measurement of small angle elastic scattering at the CERN SPS proton-antiproton collider is described. They are housed in movable sections of the beam pipe (Roman Pots) which allow access down to scattering angles of the order of 1 mrad. (orig.)

[en] The design, construction, and performance of a 3360-channel multiwire drift chamber system for use in the CERN ISR is described. These chambers eliminate the left-right ambiguity problem and provide position and direction information at the drift cell level. Single wire resolutions of 0.27 mm over 50 mm drift lengths and 0.50 mm over 100 mm drift lengths have been measured with this system. Together these chambers provide three-dimensional track reconstruction capability over a solid angle coverage of nearly 1 sr. (Auth.)

No abstract available

[en] Radiation capture of π^- on hydrogen has been measured in the momentum range from psub(π^-)=210 MeV/c to psub(π^-)=385 MeV/c and for c.m. angles between 30⁰ and 120⁰, covering the Δ(1232) resonance. The unambiguous separation of the events from the charge exchange background is based on precise neutron time-of-flight measurements. Detector efficiencies were carefully determined in separate experiments. The experimental results are in good agreement with those of the inverse reaction and with most recent multipole analyses. An upper limit of +-2% can be set on the contribution of the isotensor term to the transition amplitude. A time reversal violating phase, when added to the resonant Msub(1+)³ amplitude in the Donnachie-Shaw model, is found to be consistent with zero. (Auth.)