Explore the vast range of titles available.

Ni 1- X Zn X Fe 2 O 4 ( x  = 0, 0.25, 0.5, 0.75, 1.0) nanopowders were obtained by high temperature synthesis and annealed at 960 °C temperature. Electron paramagnetic resonance spectra of Ni 1- x Zn x Fe 2 O 4 nanopowders with different compositions were investigated in order to establish the nature of the temperature dependences ( T  = 3.7–300 K) of the spin moment of each sublattice and total spin moment. The temperature ranges in which this reorientation is observed depends on the zinc content in the compositions. A standard material of coal tar pyrolyze was used as ethalon for the calculation of the spin concentrations. It is shown that the causes of temperature changes in spin concentrations of different sublattices and, consequently, the reorientation of the total spin moment are as follows: the existence of fractions of massive grains in the Ni 1-x Zn x Fe 2 O 4 nanopowders characterized by an ultrafine structure, a finely dispersed doublet, and intermediate — superparamagnetism and nonstoichiometry, as well as in canted and superparamagnetic states.

AbstractWe discuss possible searches for the new particles predicted by Little Higgs Models at the LHC. By using a simulation of the ATLAS detector, we demonstrate how the predicted quark, gauge bosons and additional Higgs bosons can be found and estimate the mass range over which their properties can be constrained.

We evaluate the discovery reach of the ATLAS experiment for down type isosinglet quarks, D, using both their neutral and charged decay channels, namely the process pp→DD̄+X with subsequent decays resulting in 2ℓ+2j+≠E T , 3ℓ+2j+≠E T and 2ℓ+4j final states. The integrated luminosity required for observation of a heavy quark is estimated for a mass range between 600 and 1000 GeV using the combination of results from different search channels.

We study the single production of fourth-family quarks through the process pp → Q ′ jX at the Large Hadron Collider (LHC). We have calculated the decay widths and branching ratios of the fourth-family quarks ( b ′ and t ′) in the mass range 300–800 GeV. The cross sections for the signal and background processes have been calculated in a Monte Carlo framework. It is shown that the LHC can discover single t ′ and b ′ quarks if the CKM matrix elements | V t ′ q |,| V qb ′ |≳0.01.

We consider pair production of new down-type isosinglet quarks originating from E6, which is the favorite gauge symmetry group in superstring inspired GUT models. The study concentrates on the possibility of observing the pair production of the lightest of the new quarks, D, in the ATLAS detector at the forthcoming LHC accelerator, in the channel DD̄→ZjZj . Both signal and background events are studied using tree level event generators based on Monte Carlo techniques. The detector effects are taken into account using the ATLAS fast simulation tool. It is shown that ATLAS can observe the D quark within the first year of low luminosity LHC operation if its mass is less than 650 GeV. For the case of two years of full luminosity running, 1 TeV can be reached with about three sigma significance.

The DEAP-3600 detector searches for the scintillation signal from dark matter particles scattering on a 3.3 tonne liquid argon target. The largest background comes from 39Ar beta decays and is suppressed using pulse-shape discrimination (PSD). We use two types of PSD estimator: the prompt-fraction, which considers the fraction of the scintillation signal in a narrow and a wide time window around the event peak, and the log-likelihood-ratio, which compares the observed photon arrival times to a signal and a background model. We furthermore use two algorithms to determine the number of photons detected at a given time: (1) simply dividing the charge of each PMT pulse by the mean single-photoelectron charge, and (2) a likelihood analysis that considers the probability to detect a certain number of photons at a given time, based on a model for the scintillation pulse shape and for afterpulsing in the light detectors. The prompt-fraction performs approximately as well as the log-likelihood-ratio PSD algorithm if the photon detection times are not biased by detector effects. We explain this result using a model for the information carried by scintillation photons as a function of the time when they are detected.

We study the potential of the CERN LHC to observe excited neutrinos resulting from the single production process through gauge interactions and decaying in various channels. The mass range accessible with the ATLAS detector is determined.

AbstractWe study single production of excited electrons at the CERN LHC through contact interactions of fermions. Subsequent decays of excited electrons to ordinary electrons and light fermions via gauge and contact interactions are examined. The mass range accessible with the ATLAS detector is obtained.PACS: 12.60.Rc – 13.85.Rm

We report the final measurement of the neutrino oscillation parameters \\(\\Delta m^2_{32}\\) and \\(\\sin^2\\theta_{23}\\) using all data from the MINOS and MINOS+ experiments. These data were collected using a total exposure of \\(23.76 \\times 10^{20}\\) protons on target producing \\(\\nu_{mu}\\) and \\(\\overline{\\nu_\\mu}\\) beams and 60.75 kt\\(\\cdot\\)yr exposure to atmospheric neutrinos. The measurement of the disappearance of \\(\\nu_{\\mu}\\) and the appearance of \\(\\nu_e\\) events between the Near and Far detectors yields \\(|\\Delta m^2_{32}|=2.40^{+0.08}_{-0.09}~(2.45^{+0.07}_{-0.08}) \\times 10^{-3}\\) eV\\(^2\\) and \\(\\sin^2\\theta_{23} = 0.43^{+0.20}_{-0.04} ~(0.42^{+0.07}_{-0.03})\\) at 68% C.L. for Normal (Inverted) Hierarchy.