Search results for "Instrumentation"
showing 10 items of 4914 documents
Fast, low-level detection of strontium-90 and strontium-89 in environmental samples by collinear resonance ionization spectroscopy
1993
Environmental assessment in the wake of a nuclear accident requires the rapid determination of the radiotoxic isotopes 89Sr and 90Sr. Useful measurements must be able to detect 108 atoms in the presence of about 1018 atoms of the stable, naturally occurring isotopes. This paper describes a new approach to this problem using resonance ionization spectroscopy in collinear geometry, combined with classical mass separation. After collection and chemical separation, the strontium from a sample is surface-ionized and the ions are accelerated to an energy of about 30 keV. Initially, a magnetic mass separator provides an isotopic selectivity of about 106. The ions are then neutralized by charge exc…
Latest improvements of microchannel-plate PMTS
2020
Abstract The DIRC detectors of the PANDA experiment at FAIR will use multi-anode MCP-PMTs as photon sensors. After long and extensive R&D work the performance parameters of the recent 2” MCP-PMT models are converging towards the required values. The lifetime of most ALD-coated MCP-PMTs is well surpassing the DIRC requirements with the best tube currently reaching > 22 C/cm2 integrated anode charge without aging. The performance of the most advanced MCP-PMTs from PHOTONIS and Hamamatsu fulfill basically all requirements with a highlight being the high detective quantum efficiency (DQE) of almost 30% for the PHOTONIS 9002108. The improvements of the latest MCP-PMT models compared to former tu…
Conceptual design of the TRACE detector readout using a compact, dead time-less analog memory ASIC
2015
[EN] The new TRacking Array for light Charged particle Ejectiles (TRACE) detector system requires monitorization and sampling of all pulses in a large number of channels with very strict space and power consumption restrictions for the front-end electronics and cabling. Its readout system is to be based on analog memory ASICs with 64 channels each that sample a View the MathML source window of the waveform of any valid pulses at 200 MHz while discarding any other signals and are read out at 50 MHz with external ADC digitization. For this purpose, a new, compact analog memory architecture is described that allows pulse capture with zero dead time in any channel while vastly reducing the tota…
1H, 13C and 17O NMR spectral study of chlorinated 3,4-dihydroxybenzaldehydes (protocatechualdehydes)
1995
Abstract Chlorinated 3,4-dihydroxybenzaldehydes have been studied by means of 1 H, 13 C and 17 O NMR spectroscopy. The 1 H and 13 C NMR spectral assignments are based on 2-dimensional 13 C- 1 H chemical shift correlation spectroscopy (COSY). The 17 O NMR measurements at natural isotope content in organic solvents are problematic owing to the poor solubility of the compounds and/or broadness of the resonance lines. In aqueous alkaline solutions, however, all protocatechualdehydes exhibit “easy-to-detect” 17 O NMR spectral characteristics. The 17 O NMR chemical shifts in the range of 140–480 p.p.m. are interpreted as arising from the different canonical structures of formyl substituted phenol…
"Table 3" of "Heavy flavour decay muon production at forward rapidity in proton--proton collisions at \sqrt(s) = 7 TeV"
2012
pT-differential production cross section of muons from heavy flavour decays, in the rapidity range 2.5
"Table 1" of "Heavy flavour decay muon production at forward rapidity in proton--proton collisions at \sqrt(s) = 7 TeV"
2012
pT-differential production cross section of muons from heavy flavour decays, in the rapidity range 2.5
"Table 6" of "Heavy flavour decay muon production at forward rapidity in proton--proton collisions at \sqrt(s) = 7 TeV"
2012
pT-differential production cross section of muons from heavy flavour decays, in the rapidity range 3.4
"Table 5" of "Heavy flavour decay muon production at forward rapidity in proton--proton collisions at \sqrt(s) = 7 TeV"
2012
pT-differential production cross section of muons from heavy flavour decays, in the rapidity range 3.1
"Table 4" of "Heavy flavour decay muon production at forward rapidity in proton--proton collisions at \sqrt(s) = 7 TeV"
2012
pT-differential production cross section of muons from heavy flavour decays, in the rapidity range 2.8
"Table 2" of "Heavy flavour decay muon production at forward rapidity in proton--proton collisions at \sqrt(s) = 7 TeV"
2012
y-differential production cross section of muons from heavy flavour decays, in the range 2