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An improved Neutrino Oscillations Analysis of the MiniBooNE Data

Description: We calculate the exclusion region in the parameter space of {nu}{sub {mu}} {yields} {nu}{sub e} oscillations of the LSND type using a combined fit to the reconstructed energy distributions of neutrino candidate samples from the MiniBooNE data obtained with two different particle identification methods. The two {nu}{sub e} candidate samples are included together with a high statistics sample of {nu}{sub {mu}} events in the definition of a {chi}{sup 2} statistic which includes the correlations be… more
Date: January 1, 2008
Creator: Aguilar-Arevalo, Alexis Armando
Partner: UNT Libraries Government Documents Department
open access

Search for Large Extra Dimensions Based on Observations of Neutron Stars with the Fermi-LAT

Description: Large extra dimensions (LED) have been proposed to account for the apparent weakness of gravitation. These theories also indicate that the postulated massive Kaluza-Klein (KK) gravitons may be produced by nucleon-nucleon bremsstrahlung in the course of core collapse of supernovae. Hannestad and Raffelt have predicted energy spectra of gamma ray emission from the decay of KK gravitons trapped by the gravity of the remnant neutron stars (NS). These and other authors have used EGRET data on NS to … more
Date: September 19, 2012
Creator: Berenji, Bijan & /Stanford U., Appl. Phys. Dept. /SLAC
Partner: UNT Libraries Government Documents Department
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Photoisomerization and photodissociation dynamics of reactive free radicals

Description: The photofragmentation pathways of chemically reactive free radicals have been examined using the technique of fast beam photofragment translational spectroscopy. Measurements of the photodissociation cross-sections, product branching ratios, product state energy distributions, and angular distributions provide insight into the excited state potential energy surfaces and nonadiabatic processes involved in the dissociation mechanisms. Photodissociation spectroscopy and dynamics of the predissoci… more
Date: August 24, 2000
Creator: Bise, Ryan T.
Partner: UNT Libraries Government Documents Department
open access

I. Excluded Volume Effects in Ising Cluster Distributions and Nuclear Multifragmentation II. Multiple-Chance Effects in Alpha-Particle Evaporation

Description: In Part 1, geometric clusters of the Ising model are studied as possible model clusters for nuclear multifragmentation. These clusters may not be considered as non-interacting (ideal gas) due to excluded volume effect which predominantly is the artifact of the cluster's finite size. Interaction significantly complicates the use of clusters in the analysis of thermodynamic systems. Stillinger's theory is used as a basis for the analysis, which within the RFL (Reiss, Frisch, Lebowitz) fluid-of-sp… more
Date: May 16, 2005
Creator: Breus, Dimitry E.
Partner: UNT Libraries Government Documents Department
open access

Dynamics of nonreactive inelastic ion--molecule collisions

Description: Thesis. A tandem electrostatic energy analyzer molecular beam apparatus was built for studying low energy inelastic 180 deg scattering of alkali ions from molecules. A beam of essentially monoenergetic ions is produced by a first analyzer and is focused on the center of a scattering cell containing essentially stationary molecules. Ions which are not significantly deflected in their laboratory motion after collisions with the molecules are energy analyzed with a second analyzer.'Ine scattered b… more
Date: August 1, 1973
Creator: Dimpfl, W. L.
Partner: UNT Libraries Government Documents Department
open access

Measuring Antineutrino Oscillations with the MINOS Experiment

Description: MINOS is a long baseline neutrino oscillation experiment. A manmade beam of predominantly muon neutrinos is detected both 1 km and 735 km from the production point by two functionally identical detectors. A comparison of the energy spectra measured by the two detectors shows the energy-dependent disappearance of muon neutrinos characteristic of oscillations and allows a measurement of the parameters governing the oscillations. This thesis presents work leading to measurements of disappearance i… more
Date: September 1, 2008
Creator: Evans, Justin John
Partner: UNT Libraries Government Documents Department
open access

Recombination and propagation of quasiparticles in cuprate superconductors

Description: Rapid developments in time-resolved optical spectroscopy have led to renewed interest in the nonequilibrium state of superconductors and other highly correlated electron materials. In these experiments, the nonequilibrium state is prepared by the absorption of short (less than 100 fs) laser pulses, typically in the near-infrared, that perturb the density and energy distribution of quasiparticles. The evolution of the nonequilibrium state is probed by time resolving the changes in the optical re… more
Date: May 20, 2004
Creator: Gedik, Nuh
Partner: UNT Libraries Government Documents Department
open access

Measurement of the calorimetric energy scale in MINOS

Description: MINOS is a long-baseline neutrino oscillation experiment. A neutrino beam is created at the Fermi National Accelerator Laboratory in Illinois and fired down through the Earth. Measurements of the energy spectra and composition of the neutrino beam are made both at the source using the Near detector and 735 km away at the Soudan Underground Laboratory in Minnesota using the Far detector. By comparing the spectrum and flavour composition of the neutrino beam between the two detectors neutrino osc… more
Date: June 1, 2005
Creator: Hartnell, Jeffrey J.
Partner: UNT Libraries Government Documents Department
open access

Studying neutrino oscillations using quasi-elastic events in MINOS

Description: MINOS (Main Injector Neutrino Oscillation Search), is a long baseline neutrino experiment designed to search for neutrino oscillations using two detectors at Fermi National Accelerator Laboratory, IL (Near Detector) and Soudan, MN (Far Detector). It will study {nu}{sub {mu}} {yields} {nu}{sub {tau}} oscillations and make a measurement on the oscillation parameters, {Delta}m{sub 23}{sup 2} and sin{sup 2} 2{theta}{sub 23}, via a {nu}{sub {mu}} beam made at Fermilab. Charge current neutrino intera… more
Date: February 1, 2008
Creator: Kumaratunga, Sujeewa Terasita
Partner: UNT Libraries Government Documents Department
open access

Spatially indirect excitons in coupled quantum wells

Description: Microscopic quantum phenomena such as interference or phase coherence between different quantum states are rarely manifest in macroscopic systems due to a lack of significant correlation between different states. An exciton system is one candidate for observation of possible quantum collective effects. In the dilute limit, excitons in semiconductors behave as bosons and are expected to undergo Bose-Einstein condensation (BEC) at a temperature several orders of magnitude higher than for atomic B… more
Date: March 1, 2004
Creator: Lai, Chih-Wei Eddy
Partner: UNT Libraries Government Documents Department
open access

A study of muon neutrino disappearance in the MINOS detectors and the NuMI beam

Description: There is now substantial evidence that the proper description of neutrino involves two representations related by the 3 x 3 PMNS matrix characterized by either distinct mass or flavor. The parameters of this mixing matrix, three angles and a phase, as well as the mass differences between the three mass eigenstates must be determined experimentally. The Main Injector Neutrino Oscillation Search experiment is designed to study the flavor composition of a beam of muon neutrinos as it travels betwe… more
Date: January 1, 2010
Creator: Ling, Jiajie
Partner: UNT Libraries Government Documents Department
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A search for muon neutrino and antineutrino disappearance in the Booster Neutrino Beam

Description: This dissertation presents a search for {mu}{sub {nu}} and {bar {mu}{sub {nu}}} disappearance with the MiniBooNE experiment in the {Delta}m{sup 2} region of a few eV{sup 2}. Disappearance measurements in this oscillation region constrain sterile neutrino models and CPT violation in the lepton sector. Fits to the shape of the {mu}{sub {nu}} and {bar {mu}{sub {nu}}} energy spectra reveal no evidence for disappearance in either mode. This is the first test of {bar {mu}{sub {nu}}} disappearance bet… more
Date: April 1, 2009
Creator: Mahn, Kendall Brianna McConnel
Partner: UNT Libraries Government Documents Department
open access

A study of muon neutrino disappearance with the MINOS detectors and the NuMI neutrino beam

Description: This thesis presents the results of an analysis of {nu}{sub {mu}} disappearance with the MINOS experiment, which studies the neutrino beam produced by the NuMI facility at Fermi National Accelerator Laboratory. The rates and energy spectra of charged current {nu}{sub {mu}} interactions are measured in two similar detectors, located at distances of 1 km and 735 km along the NuMI beamline. The Near Detector provides accurate measurements of the initial beam composition and energy, while the Far D… more
Date: June 1, 2008
Creator: Marshall, John Stuart & U., /Cambridge
Partner: UNT Libraries Government Documents Department
open access

Observation of deficit in NuMI neutrino-induced rock and non-fiducial muons in MINOS Far Detector and measurement of neutrino oscillation parameters

Description: The MINOS (Main Injector Neutrino Oscillation Search) experiment has observed muon neutrino disappearance consistent with the oscillation hypothesis tested by Super-Kamiokande and K2K. The survival probability for {nu}{sub {mu}} is given approximately by 1 - sin{sup 2}2{theta}{sub 23}sin{sup 2}(1.27{Delta}m{sup 2}{sub 32}L/E), where{theta}{sub 23} and {Delta}m{sup 2}{sub 32} are the mixing angle and difference in mass squared in eV{sup 2}/c{sup 4} between the mass eigenstates {nu}{sub 3} and {n… more
Date: August 1, 2007
Creator: McGowan, Aaron Michael
Partner: UNT Libraries Government Documents Department
open access

Muon Energy Calibration of the MINOS Detectors

Description: MINOS is a long-baseline neutrino oscillation experiment designed to search for conclusive evidence of neutrino oscillations and to measure the oscillation parameters precisely. MINOS comprises two iron tracking calorimeters located at Fermilab and Soudan. The Calibration Detector at CERN is a third MINOS detector used as part of the detector response calibration programme. A correct energy calibration between these detectors is crucial for the accurate measurement of oscillation parameters. Th… more
Date: September 1, 2004
Creator: Miyagawa, Paul S.
Partner: UNT Libraries Government Documents Department
open access

ANALYSIS OF THE INTERACTION OF 300-Mev NEUTRONS WITH XENON

Description: An investigation of the interactions between 300-Mev neutrons and xenon was made by means of a cloud chamber in a pulsed magnetic field of 21,700 gauss placed in the neutron beam of the 184-inch Berkeley cyclotron. Eighty-seven negative pion events and 257 other stars were analyzed. In addition an experimental check was made on the energy of the incoming neutrons. Classification, identification, and angular and energy distributions of prongs associated with all events are presented. Interpretat… more
Date: October 17, 1956
Creator: Morris, Richard Herbert.
Partner: UNT Libraries Government Documents Department
open access

Delayed neutron emission from mass-separated fission products

Description: Thesis. Delayed neutron characteristics of six fission product nuclides were determined using a mass separator operated on-line with a nuclear reactor. Beta-decay half-lives were- measured using neutron multiscaling techniques for the precursors /sup 88/Br, /sup 89/Br, /sup 98/Kr, /sup 93/Kr, /sup 137/I, and / sup 138/I. The observed half-lives were 16.52 plus or minus .17 seconds, respectively.. Energy spectra were measured for delayed neutrons emitted in the beta-decays of /sup 17/N, /sup 137… more
Date: February 1, 1974
Creator: Norman, J.H.
Partner: UNT Libraries Government Documents Department
open access

A search for sterile neutrinos at the MINOS experiment

Description: MINOS is a long baseline neutrino oscillation experiment based at the Fermi National Accelerator Laboratory in Illinois, USA. The experiment was designed to study neutrino oscillation phenomena. The {nu}{sub {mu}} beam produced by the NuMI beam facility at FNAL is used along with two functionally identical detectors. The Near Detector at FNAL and a Far Detector 735 km away in the Soudan Underground Laboratory in northern Minnesota. Comparison of the observed spectra of neutrinos at the two dete… more
Date: August 1, 2010
Creator: Pittam, Robert Neil & U., /Oxford
Partner: UNT Libraries Government Documents Department
open access

Muon Capture in Lead

Description: No Description Available.
Date: January 1, 1968
Creator: Sashin, Donald & Nadelhaft, Irving
Partner: UNT Libraries Government Documents Department
open access

The Cryogenic Dark Matter Search and Background Rejection with Event Position Information

Description: Evidence from observational cosmology and astrophysics indicates that about one third of the universe is matter, but that the known baryonic matter only contributes to the universe at 4%. A large fraction of the universe is cold and non-baryonic matter, which has important role in the universe structure formation and its evolution. The leading candidate for the non-baryonic dark matter is Weakly Interacting Massive Particles (WIMPs), which naturally occurs in the supersymmetry theory in particl… more
Date: January 1, 2005
Creator: Wang, Gen-sheng & U., /Case Western Reserve
Partner: UNT Libraries Government Documents Department
open access

Development and Implementation of Photonuclear Cross-Section Data for Mutually Coupled Neutron-Photon Transport Calculations in the Monte Carlo N-Particle (MCNP) Radiation Transport Code

Description: The fundamental motivation for the research presented in this dissertation was the need to development a more accurate prediction method for characterization of mixed radiation fields around medical electron accelerators (MEAs). Specifically, a model is developed for simulation of neutron and other particle production from photonuclear reactions and incorporated in the Monte Carlo N-Particle (MCNP) radiation transport code. This extension of the capability within the MCNP code provides for the … more
Date: July 1, 2000
Creator: White, Morgan C.
Partner: UNT Libraries Government Documents Department
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