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Showing 1 to 20 of 48 for “"particle production"”.
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Some Aspects of Inflationary Particle Production
Particle production by a varying mass term and by the background metric are considered. We derive a definition of particle number in kinetic theory for both, fermionic and scalar case, which we generalize to the situation of a flavour-mixing mass matrix. This allows us to endow the process of …
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Thermal particle production in the early universe
The thesis deals with the production of weakly interacting particles via decay and scattering in the early universe which is in the state of a hot thermal plasma. Already at leading order in the gauge coupling constant multiple rescattering off soft (p ~ gT) gauge bosons has to be included which …
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Transverse spin asymmetries in neutral strange particle production
… Significant transverse spin asymmetries in the production of hadrons have been observed over many years, and are related to both the transverse polarisation of quarks in a transversely polarised proton and to the spin dependence of orbital motion. These asymmetries are of interest because of …
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Controlled emulsion droplet solvent evaporation for particle production
… work, we are motivated by the need to produce particles of well-controlled size, shape and morphology for general application in catalysis, environmental remediation, nanomedicine, pharmaceuticals, the development of new materials, and other fields. Moreover, our approaches are guided by the …
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Hadronic gas models in particle production and phase transitions
In this work the methods of exact quantum number conservation in statistical mechanics are discussed and applied to the field of high energy nucleus-nucleus collisions. Various types of hadronic gas models are discussed as well as their merits and restrictions. Attempts to construct a …
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An excitation function of particle production at the AGS
Measurements of [pi]+ , K+ , K-, and p production from Au - Au reactions have been made by experiments E866 and E917 at the Brookhaven National Laboratory Alternating Gradient Synchrotron. The measurements have been made as a function of beam energy, at kinetic beam energies in the laboratory of 2 …
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Strange-particle production in 8 BeV/c proton-proton interactions
… scanned for and 7,300 candidates for strange particle events were found. Of these, 3,600 were successfully measured and3 of these, 1,260 strange particle events were identified. A fiducial region was selected and the partial cross section for 33 different final states calculated; This …
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Strange particle production in pi-p and pi+n interactions at 2.5 GeV/c
… in deuterium has been performed to study strange particle production. Cross sections for pi-p reactions exhibit no marked departure from trends established by other experiments at nearby energies. In extracting information about pi+n interactions from the pi+D exposure it was found that 15 to 30% …
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Strange Particle Production in Negative Pion-Proton and Positive Pion-Neutron Interactions at 2.5 Gev/c
Made available in DSpace on 2015-05-12T21:41:41Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6801763.PDF: 4034070 bytes, checksum: e7a6ba7a88fcc6539b4801b3c26132eb (MD5) Previous issue date: 1967
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In-Situ Studies of Copper Nanoparticles Using a Novel Tandem Ultra-High Vacuum Particle Production Chamber Transmission Electron Microscope
Nanophase materials, a compaction of nano-particles, are arguably a new phase of matter whose high grain-boundary-to-volume ratio leads to new and enhanced material properties. Previously, these materials have been difficult to study because of their sensitivity to contaminating atmospheres. We …
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A study of Zweig's rule using phi mesons in a broad band neutral beam
… as could be expected. Other ratios show strange particle production down from non-strange particle production by a factor of twelve. Decays involving phi mesons are studied, and the only candidate seen is a four sigma effect in the mode two phis with a mass 2.15 Gev. F meson, charm pseudo-scalar …
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Unintegrated Gluon Distributions at Small-x
… which admit a factorized description. Single-particle production processes and two-particle production processes are studied in asymmetric collisions of a dilute probe scattering from a dense target and it is shown that it is possible to recover factorized expression in a particular …
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Early universe cosmology as a probe of fundamental physics
… Next, we investigate the phenomenology of particle production events during inflation focusing on cases that are well motivated both by UV physics and bottom-up EFT considerations. Considering the</p> <p>cosmological correlators in the presence of particle production, we explore the …
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Jet structure and planarity in pi- rho interactions at 147 gev/c
… is found to be closely associated with leading particle production. In the central region, jet structure is seen to be absent. No strong evidence for planarity is seen. Certain cuts on the tensor invariants are found to greatly enhance rho 0 production.
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EXPANSION AFTER INFLATION AND REHEATING WITH A CHARGED INFLATON
… hot, thermal phase required for the production of light elements via big-bang nucleosynthesis. It is desirable for such a model also to include a mechanism for the generation of the observed matter-antimatter asymmetry and perhaps a primordial mechanism for the generation of cosmic …
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Measurement of non-flow correlations and elliptic flow fluctuations in Au+Au collisions at RHIC
Measurements of collective flow and two-particle correlations have proven to be effective tools for understanding the properties of the system produced in ultrarelativistic nucleus-nucleus collisions at the Relativistic Heavy Ion Collider (RHIC). Accurate modeling of the initial conditions of a …
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Removal of Anisotropic Background from Neutral Pion and Tagged Direct Photon–Hadron Correlations of Au+Au 200 GeV Collisions
… to remove the collective background from two particle correlation measurements in heavy ion collisions. The method eliminates the need for any external flow measurements and is well suited for studying the path length dependence of particle production in quark-gluon plasma. Central to …
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Production and characterisation of nanoparticulate silicon photovoltaic devices
… used consisted of n- and p-type silicon nanoparticles produced by means of high energy mechanical milling, as well as commercially sourced nanophase intrinsic silicon powder. Results from microscopy revealed that the nanoparticles had formed clusters that were capable of transporting charge …
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Thermal modelling of ultrarelativistic heavy ion collisions conserving strangeness exactly
[ pg 56-60,87,88 missing] Thermal modelling of particle production in ultrarelativistic heavy ion collisions incorporating appropriate conservation principles with respect to the relevant quantum numbers, has been highly successful in determining chemical freeze-out conditions across a wide range …
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