Experience with the jet-chamber of the JADE detector at PETRA

Drumm, H.; Eichler, R.; Granz, B.; Heintze, J.; Heinzelmann, G.; Heuer, R. D.; Krogh, J. von; Lennert, P.; Nozaki, T.; Rieseberg, H.; Wagner, A.; Warming, P.

doi:10.1016/0029-554x(80)90725-9

Cited by 98 publications

(22 citation statements)

References 13 publications

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“…The EXO-200 detector, shown in Fig. 1, is a time projection chamber (TPC) [10] using liquid Xe (LXe) as both the source of nuclear decays and the detection medium. The TPC has the geometry of a cylinder of 40 cm diameter and 44 cm length, with the drift field obtained by biasing a cathode grid dividing the cylinder into two identical regions.…”

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confidence: 99%

Observation of Two-Neutrino Double-Beta Decay inXe136with the EXO-200 Detector

Ackerman¹,

Aharmim²,

Auger³

et al. 2011

Phys. Rev. Lett.

183

130

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We report the observation of two-neutrino double-beta decay in (136)Xe with T(1/2) = 2.11 ± 0.04(stat) ± 0.21(syst) × 10(21) yr. This second-order process, predicted by the standard model, has been observed for several nuclei but not for (136)Xe. The observed decay rate provides new input to matrix element calculations and to the search for the more interesting neutrinoless double-beta decay, the most sensitive probe for the existence of Majorana particles and the measurement of the neutrino mass scale.

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confidence: 99%

Observation of Two-Neutrino Double-Beta Decay inXe136with the EXO-200 Detector

Ackerman¹,

Aharmim²,

Auger³

et al. 2011

Phys. Rev. Lett.

183

130

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“…ner drift chambers (IDCs), a superconducting solenoid, outer drift chambers (ODCs), and a time of flight (TOF) hodoscope. The solenoid produces a magnetic field of 1 T with an uniformity of ±15% inside the bore.The JET chamber [7], as the key tracking detector, measures up to 24 points per track three-dimensionally, each with the resolution [8] of 200 µm in rφ plane and of 2 cm in z-position (a cylindrical coordinate (rφz) is determined by defining the magnetic field direction as z-axis). Each of the IDCs and ODCs consists of two 12-mmthick drift layers which are divided into 50-mm-wide cells, and measures rφ position each with 200 µm resolution.…”

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confidence: 99%

A new limit on the flux of cosmic antihelium

Saeki¹,

Anraku²,

Orito³

et al. 1998

Physics Letters B

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A very sensitive search for cosmic-ray antihelium was performed using data obtained from three scientific flights of BESS magnetic rigidity spectrometer. We have not observed any antihelium; this places a model-independent upper limit (95 % C.L.) on the antihelium flux of 6 × 10 −4 m −2 sr −1 s −1 at the top of the atmosphere in the rigidity region 1 to 16 GV, after correcting for the estimated interaction loss of antihelium in the air and in the instrument. The corresponding upper limit on the He/He flux ratio is 3.1 ×10 −6 , 30 times more stringent than the limits obtained in similar rigidity regions with magnetic spectrometers previous to BESS. PACS numbers: 98.80.Cq, 98.70.Sa, 98.80.Bp, 98.90.+s Cosmic-ray observations provide most direct evidence for our Galaxy being composed mostly by baryons. This baryon-antibaryon asymmetry can be global in the Universe, being created in the very early Universe due to the violations of CP and of baryon-number. However, depending on the nature of CP violation, baryon-symmetric models are conceivable [1] in which the Universe is separated into an equal number of matter-and antimatterdomains. Whereas γ-ray observations place strong limitations on the antimatter in our Galaxy and in the local cluster of galaxies, the domain structure could still exist beyond this scale. Although antihelium might be in principle produced in cosmic-ray interactions, their contribution to the He/He flux ratio is expected to be much smaller than 10 −12 [2]. Detecting antihelium at a level higher than this could therefore provide the evidence of antimatter domains or of other exotic phenomena such as superconducting strings in our Galaxy [3]. For further discussion of astrophysical considerations regarding the search for antihelium see the references [4,5]. We report in this letter (for more detail see [6]) a sensitive search for antihelium using the data from the '93, '94, and '95 flights of BESS detector, and provide model-independent upper limits on the absolute antihelium flux as well as on the He/He flux ratio. A limit on the flux ratio from an early analysis of '95 data is published elsewhere [4]. Fig. 1 shows front-and side-views of the BESS '95 instrument. The cylindrical configuration provides a wide tracking region and an acceptance of up to 0.32 m 2 sr depending on the off-line fiducial cuts. From inside to outside, it includes a jet-type drift (JET) chamber, in- * This work is dedicated to the memory of Dr. R. Golden.ner drift chambers (IDCs), a superconducting solenoid, outer drift chambers (ODCs), and a time of flight (TOF) hodoscope. The solenoid produces a magnetic field of 1 T with an uniformity of ±15% inside the bore.The JET chamber [7], as the key tracking detector, measures up to 24 points per track three-dimensionally, each with the resolution [8] of 200 µm in rφ plane and of 2 cm in z-position (a cylindrical coordinate (rφz) is determined by defining the magnetic field direction as z-axis). Each of the IDCs and ODCs consists of two 12-mmthick drift layers which are divid...

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“…The Jet chamber is designed to combine good space and double track resolution, essential for the efficient recording of jet-like events, with the possibility of particle identification, within a solid angle close to 4π. The design principle was established with the jet chamber of the JADE [67] at PETRA. The sensitive volume of the jet chamber is a cylinder with a length of 4 m, surrounding the beam pipe and vertex detector.…”

Section: The Jet Chamber (Cj)mentioning

confidence: 99%

“…The barrel part of the muon detector consists of 110 large area drift chambers. The chambers have been developed from those used at JADE [67]. Each chamber is 1.2 m wide and 90 mm deep.…”

Section: Muon Detectormentioning

confidence: 99%

Coherence Effects and Perturbative QCD Tests with the OPAL Detector at LEP

Boutemeur

2002

Fortschr. Phys.

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I report on results and methods from a set of analyses performed within the OPAL collaboration at CERN. The full available data sample collected at and near the Z0 resonance is used. Results concern colour‐field interference and coherence phenomena, quark and gluon jet properties, identified particles in quark and gluon jets, measurements of the QCD colour factors and relevant tests of recently improved perturbative QCD calculations. The challenge is that QCD is a quantum field theory that requires all orders in perturbation theory and non‐perturbative analysis to confront data at available energies. Thus, precise measurements can be thought as explorations of quantum field theory itself. Nonetheless, these tests and measurements have important practical applications, in the calculation of backgrounds to new physics and, for hadron collider particularly, in predictions for new particle cross‐sections.

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Experience with the jet-chamber of the JADE detector at PETRA

Cited by 98 publications

References 13 publications

Observation of Two-Neutrino Double-Beta Decay inXe136with the EXO-200 Detector

Observation of Two-Neutrino Double-Beta Decay inXe136with the EXO-200 Detector

A new limit on the flux of cosmic antihelium

Coherence Effects and Perturbative QCD Tests with the OPAL Detector at LEP

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