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Modern Study Of Environmental Pollution From The Emission Of Alpha Particles In Human Blood Samples In The City Of Najaf, Iraq, Basim A. Almayahi 2015 USM

Modern Study Of Environmental Pollution From The Emission Of Alpha Particles In Human Blood Samples In The City Of Najaf, Iraq, Basim A. Almayahi

21st International Conference on Environmental Indicators (ICEI 2015)

No abstract provided.


Design And Fabrication Of Liquid Scintillator Counter, Andrea Calderon Saucedo, John L. Orrell 2015 California State University - Long Beach

Design And Fabrication Of Liquid Scintillator Counter, Andrea Calderon Saucedo, John L. Orrell

STAR (STEM Teacher and Researcher) Program Posters

Pacific Northwest National Laboratory (PNNL) is currently developing an ultra-low background liquid scintillator counter (ULB LSC) in the shallow underground laboratory. At a depth of 35-meters water-equivalent, the underground laboratory has a multi-layered shielding to keep out cosmic-ray induced background. The ULB LSC, which is located in a clean room facility, is a multi-layered design made up of various materials, including plastic scintillator veto panels, borated polyethylene, lead and copper. These layers help lower the contributions of the terrestrial background and intrinsic background, resulting from the impurities present in the materials, to the overall background count rate observed by the ...


Cover, 2015 University of Tennessee, Knoxville

Cover

International Journal of Nuclear Security

No abstract provided.


Masthead, 2015 University of Tennessee, Knoxville

Masthead

International Journal of Nuclear Security

No abstract provided.


Student Writing Competition, 2015 University of Tennessee, Knoxville

Student Writing Competition

International Journal of Nuclear Security

No abstract provided.


From The Editor, 2015 University of Tennessee, Knoxville

From The Editor

International Journal of Nuclear Security

No abstract provided.


Relativistic And Non-Relativistic Proton-Nucleus Scattering, Kinsey Ann Elisabeth Zarske-Williamson 2015 The University of Southern Mississippi

Relativistic And Non-Relativistic Proton-Nucleus Scattering, Kinsey Ann Elisabeth Zarske-Williamson

Honors Theses

Calculations for proton-nucleus scattering often rely on transition amplitudes. We implement new transition amplitudes [7] with the relativistic equations. We can find the matrix elements of the operators between the usual Dirac spinor basis or the helicity spinor basis. The operators can also be written as a linear combination of non-relativistic spin operators. To transform from one basis to another, we need to find a transformation matrix. We must establish what one of the factors that appears in the transformed expression means in order to correctly complete our transformation matrix. Once this is resolved, our transformation matrix will be complete.


Event Localization In Bulk Scintillator Crystals Using Optical Coded Apertures, Joshua Brian Braverman 2015 University of Tennessee - Knoxville

Event Localization In Bulk Scintillator Crystals Using Optical Coded Apertures, Joshua Brian Braverman

Doctoral Dissertations

Scintillation-based radiation detectors provide an effective method to detect radioactive materials. In medical physics, astrophysics, and national security technology oftentimes it is optimal to have the ability to localize a radioactive interaction in a scintillator to as small a region as possible within the crystal. Current methods rely on the ability to centroid a light spot as read onto a phototransducer (commonly a photomultiplier tube), and due to the typical width of the light spot when it reaches the phototransducer, the resolution is generally limited to several millimeters. One method to achieve a finer resolution is to use a segmented ...


Computational Framework For Small Animal Spect Imaging: Simulation And Reconstruction, Sang Hyeb Lee 2015 University of Tennessee - Knoxville

Computational Framework For Small Animal Spect Imaging: Simulation And Reconstruction, Sang Hyeb Lee

Doctoral Dissertations

Small animal Single Photon Emission Computed Tomography (SPECT) has been an invaluable asset in biomedical science since this non-invasive imaging technique allows the longitudinal studies of animal models of human diseases. However, the image degradation caused by non-stationary collimator-detector response and single photon emitting nature of SPECT makes it difficult to provide a quantitative measure of 3D radio-pharmaceutical distribution inside the patient. Moreover, this problem exacerbates when an intra-peritoneal X-ray contrast agent is injected into a mouse for low-energy radiotracers.

In this dissertation, we design and develop a complete computational framework for the entire SPECT scan procedure from the radio-pharmaceutical ...


Mass Table Calculations With Nuclear Density Functional Theory, Noah Watson Birge 2015 University of Tennessee - Knoxville

Mass Table Calculations With Nuclear Density Functional Theory, Noah Watson Birge

Masters Theses

To better understand nuclei and the strong nuclear force, it is useful to analyze global nuclear properties and trends across the nuclear chart. To this end, we utilized Nuclear Density Functional Theory with Skyrme Energy Density Functionals in conjunction with high-performance computing to perform large-scale mass table calculations for even-even nuclei. Using the binding energy, pairing gap, root-mean-square radius, and deformation data from these tables we were able to analyze the two-proton and two-neutron drip lines, neutron skin depth, two-proton radioactivity, and the effect of nuclear deformation on mass filters. We used numerous energy density functionals to assess the statistical ...


Studies Of Polarized Helium-3 Cell Lifetimes, Andrew N. Smith 2015 College of William and Mary

Studies Of Polarized Helium-3 Cell Lifetimes, Andrew N. Smith

Honors Theses

This year I worked with Professor Averett to fill and analyze several $^3$He target cells. Many of these cells are taken from our lab to eventually be used as targets at Jefferson Lab for nuclear physics experiments. Our ultimate goal was to test a number of different variables in an attempt to improve the lifetimes of future targets. Over the course of this year we tested several different cells and eventually got some improvements in our cell lifetimes due to a couple factors, including a new tubing getter and larger cell size. We have not quite identified exactly what ...


Measurements Of The Lead-Hydrocarbon Cross Section Ratio For Charged-Current Neutrino Interactions, William F. Bergan 2015 College of William and Mary

Measurements Of The Lead-Hydrocarbon Cross Section Ratio For Charged-Current Neutrino Interactions, William F. Bergan

Honors Theses

Studying the neutrino cross sections of various materials is of great importance in the analysis of data from neutrino oscillation experiments, as well as interesting in its own right. We have examined the charged-current muon neutrino cross section ratio between lead and scintillator, with our lead target being in the MINERvA electromagnetic calorimeter. This choice has allowed us to obtain usable efficiencies out to much larger muon angles than was feasible from the upstream targets. Comparing the cross section ratio in the data and Monte Carlo, we have found that the ratios agree reasonably well as a function of neutrino ...


Effect Of Hyperons On Pion Asymmetries Measured In The Qweak Experiment, Marcus S. Starman 2015 College of William and Mary

Effect Of Hyperons On Pion Asymmetries Measured In The Qweak Experiment, Marcus S. Starman

Honors Theses

Experimental nuclear physics has largely been concerned with testing the Standard Model of particle physics. The Qweak experiment was designed to measure the weak interaction force of the proton. The experiment was also used to make asymmetry measurements on pions produced by inelastic collisions. The asymmetry measured in the experiment for pions was larger than expected at lower momentums given the kinematic conditions. A possible cause for the larger asymmetry is the production of hyperons, which decay into pions that can be detected. This idea was investigated, and an acceptance function for these pions was formulated. The acceptance function took ...


Taming Of Monsters: The Postdramatic Case For Copenhagen, Shaan Y. Sharma 2015 College of William and Mary

Taming Of Monsters: The Postdramatic Case For Copenhagen, Shaan Y. Sharma

Honors Theses

Analysis of Michael Frayn's manipulation of perspective in his works, the implications of a postdramatic interpretation of Copenhagen, the production process of the show, and reflections on the performance.


A Study Of The Cosmic Ray Rate In The Chips-M Prototype Detector, Brandon Taylor Kriesten 2015 College of William and Mary

A Study Of The Cosmic Ray Rate In The Chips-M Prototype Detector, Brandon Taylor Kriesten

Honors Theses

Following the discovery of neutrino mass and neutrino oscillations, the next big question is whether or not neutrinos violate charge-parity symmetry. To achieve the precision in electron neutrino appearance necessary to make measurements of charge parity symmetry violation, we need a detector with a very large fiducial mass. These large detectors are beyond our budgetary reach and take an incredible amount of time to build. The CHIPS collaboration is building a series of prototype detectors with the aim to lower the cost of these massive detectors and develop an incremental approach so that the physics measurements can be made in ...


Geant4 Simulation Of Detector Properties In The Moller Experiment, Christopher R. Haufe 2015 College of William and Mary

Geant4 Simulation Of Detector Properties In The Moller Experiment, Christopher R. Haufe

Honors Theses

To explore the existence of new physics beyond the scope of the electroweak theory, international collaborations of nuclear physicists have constructed several precision-measurement experiments. One of these is the MOLLER experiment---a low-energy parity violation experiment that will utilize the 12 GeV upgrade of Jefferson Lab's CEBAF accelerator. The motivation of this experiment is to measure the parity violating asymmetry of Møller scattering in a liquid hydrogen target. This measurement would allow for a more precise determination of the electron's weak charge and the weak mixing angle. While still in its planning stages, the MOLLER experiment requires a detailed ...


Fission Fragment Tracking And Identification In The Neutron-Induced Fission Fragment Tracking Experiment’S Time Projection Chamber, Eric Song 2015 California Polytechnic State University - San Luis Obispo

Fission Fragment Tracking And Identification In The Neutron-Induced Fission Fragment Tracking Experiment’S Time Projection Chamber, Eric Song

Physics

The Neutron-Induced Fission Fragment Tracking Experiment (NIFFTE) built a novel Time Projection Chamber (TPC), the FissionTPC, for measuring neutron-induced fission cross-sections to unprecedented precision. We investigated data from a 2014 run (400010151) at the Los Alamos Neutron Science Center (LANSCE) with a double-sided U235/Pu239 target. Our particle identification studies will aid in the development of improved tracking algorithms.


A Measurement Of The Prompt Fission Neutron Energy Spectrum For 235U(N,F) And The Neutron-Induced Fission Cross Section For 238U(N,F), Zachariah W. Miller 2015 University of Kentucky

A Measurement Of The Prompt Fission Neutron Energy Spectrum For 235U(N,F) And The Neutron-Induced Fission Cross Section For 238U(N,F), Zachariah W. Miller

Theses and Dissertations--Physics and Astronomy

Two measurements have been made, addressing gaps in knowledge for 235U(n,f) and 238U(n,f). The energy distribution for prompt fission neutrons is not well-understood below 1 MeV in 235U(n,f). To measure the 235U(n,f) prompt fission neutron distribution, a pulsed neutron beam at the WNR facility in Los Alamos National Laboratory was directed onto a 235U target with neutron detectors placed 1 m from the target. These neutron detectors were designed specifically for this experiment and employed a unique geometry of scintillating plastic material that was designed to reject ...


Measurement Of The Dμd Quartet-To-Doublet Molecular Formation Rate Ratio (Λq : Λd) And The Μd Hyperfine Rate (Λqd) Using The Fusion Neutrons From Μ− Stops In D2 Gas, Nandita Raha 2015 University of Kentucky

Measurement Of The Dμd Quartet-To-Doublet Molecular Formation Rate Ratio (Λq : Λd) And The Μd Hyperfine Rate (Λqd) Using The Fusion Neutrons From Μ− Stops In D2 Gas, Nandita Raha

Theses and Dissertations--Physics and Astronomy

The MuSun experiment will determine the μd capture rate (μ−+d ->n+n+νe) from the doublet hyperfine state Λd, of the muonic deuterium atom in the 1S ground state to a precision of 1.5%. Modern effective field theories (EFT) predict that an accurate measurement of Λd would determine the two-nucleon weak axial current. This will help in understanding all weak nuclear interactions such as the stellar thermonuclear proton-proton fusion reactions, the neutrino reaction ν+d (which explores the solar neutrino oscillation problem). It will also help us understand weak nuclear interactions involving more than two ...


The N-P Scattering Cross Section From 90 Kev To 1.8 Mev, Hongwei Yang 2015 University of Kentucky

The N-P Scattering Cross Section From 90 Kev To 1.8 Mev, Hongwei Yang

Theses and Dissertations--Physics and Astronomy

There have been very few measurements of the total cross section for n-p scattering below 500 keV. In order to differentiate among NN potential models, improved cross section data between 20 and 600 keV are required. We measured the n-p and n-C total cross sections in this energy region by transmission; a collimated neutron beam was passed through CH2 and C samples and transmitted neutrons were detected by a BC-501A deuterated liquid scintillator. Cross sections were obtained by taking the ratios of normalized neutron yields with the samples in the beam and with no sample in the beam. Both ...


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