37 research outputs found
Investigation of the performance of an optimised MicroCAT, a GEM and their combination by simulations and current measurements
A MicroCAT (Micro Compteur A Trous) structure which is used for avalanche
charge multiplication in gas filled radiation detectors has been optimised with
respect to maximum electron transparency and minimum ion feedback. We report on
the charge transfer behaviour and the achievable gas gain of this device. A
three-dimensional electron and ion transfer simulation is compared to results
derived from electric current measurements. Similarly, we present studies of
the charge transfer behaviour of a GEM (Gas Electron Multiplier) by current
measurements and simulations. Finally, we investigate the combination of the
MicroCAT and the GEM by measurements with respect to the performance at
different voltage settings, gas mixtures and gas pressures.Comment: 26 pages, 32 figure
Silicon Drift Detector Readout Electronics for a Compton Camera
A prototype detector for Compton camera imaging is under development. A
monolithic array of 19 channel Silicon drift detector with on-chip electronics
is going to be used as a scatter detector for the prototype system. Custom
designed analog and digital readout electronics for this detector was first
tested by using a single cell Silicon drift detector. This paper describes the
readout architecture and presents the results of the measurement.Comment: 10 pages, 9 figures, submitted to Nucl. Instr. Meth.
Theoretical study of incoherent phi photoproduction on a deuteron target
We study the photoproduction of phi mesons in deuteron, paying attention to
the modification of the cross section from bound protons to the free ones with
the aim of comparing with recent results at LEPS. For this purpose we take into
account Fermi motion in single scattering and rescattering of the phi to
account for phi absorption on a second nucleon as well as the rescattering of
the proton. We find that the contribution of the double scattering is much
smaller than the typical cross section of gamma p to phi p in free space, which
implies a very small screening of the phi production in deuteron. The
contribution from the proton rescattering, on the other hand, is found to be
not negligible compared to the cross section of gamma p to phi p in free space,
and leads to a moderate reduction of the phi photoproduction cross section on a
deuteron at forward angles if LEPS set up is taken into account. The Fermi
motion allows contribution of the single scattering in regions forbidden by
phase space in the free case. In particular, we find that for momentum
transferred squared close to the maximum value, the Fermi motion changes
drastically the shape of d sigma / dt, to the point that the ratio of this
cross section to the free one becomes very sensitive to the precise value of t
chosen, or the size of the bin used in an experimental analysis. Hence, this
particular region of t does not seem the most indicated to find effects of a
possible phi absorption in the deuteron. This reaction is studied theoretically
as a function of t and the effect of the experimental angular cuts at LEPS is
also discussed, providing guidelines for future experimental analyses of the
reaction.Comment: 17 pages, 16 figure
Coherent phi and omega meson photoproduction from deuteron and non-diffractive channels
For coherent photoproduction of phi and omega mesons from deuteron at forward
angles, the isovector pi-exchange amplitude is strongly suppressed.
We show a possibility to study the non-diffractive channels associated with
the unnatural parity exchange in phi-photoproduction and with the baryon
resonance excitations in omega-photoproduction by measuring the spin
observables.Comment: 5 pages, 7 figure
Photoproduction of phi mesons from nuclei
We investigate the consequences of possible medium modifications of the phi
meson at finite nuclear matter density on the K+K- mass distribution in
photonuclear reactions. The inclusive cross sections for K+K- pair production
are calculated within a semi--classical BUU transport model, which combines the
initial state interaction of the incoming photon with the final state
interactions of the produced particles. The effects of final state interactions
on the invariant mass distribution of the observed K+K- pairs are discussed in
detail. In addition we calculate the Coulomb correction and possible effects of
hadronic kaon potentials on the K+K- mass spectrum. Due to the large cross
sections for reactions of the final state particles with the surrounding
nuclear medium and the influence of the Coulomb potential we find no measurable
sensitivity of the observables to the phi properties at finite baryon density.Comment: revtex4, 24 page
Measurement of the Photon Structure Function F2gamma with the L3 Detector at LEP
The e+e- -> e+e- hadrons reaction, where one of the two electrons is detected
in a low polar-angle calorimeter, is analysed in order to measure the hadronic
photon structure function F2gamma . The full high-energy and high-luminosity
data set, collected with the L3 detector at centre-of-mass energies 189-209GeV,
corresponding to an integrated luminosity of 608/pb is used. The Q^2 range
11-34GeV^2 and the x range 0.006-0.556 are considered. The data are compared
with recent parton density functions