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Suppression Of High Transverse Momentum Charged Hadrons In Au+Au Collisions At 200 Gev Nucleon-Nucleon Center Of Mass Energy, Jason B. Bryslawskyj 2016 Graduate Center, City University of New York

Suppression Of High Transverse Momentum Charged Hadrons In Au+Au Collisions At 200 Gev Nucleon-Nucleon Center Of Mass Energy, Jason B. Bryslawskyj

All Graduate Works by Year: Dissertations, Theses, and Capstone Projects

The dynamical properties of quark gluon plasma are studied in heavy ion collisions. Gold ions are accelerated with the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory and collided at energies up to 200 GeV per nucleon. Collision products and their properties are detected and measured with the PHENIX detector. At these energies the colliding ions may form a thermalized distribution of quarks and gluons called the Quark-Gluon Plasma. The suppression of single hadrons still provides one of the strongest constraints on energy loss mechanisms in the Quark-Gluon Plasma. Presently, neutral pions provide the best measurement at RHIC of ...


Studies On The Daq System Of Grinch Detector, Peibo An 2016 College of William and Mary

Studies On The Daq System Of Grinch Detector, Peibo An

College of William & Mary Undergraduate Honors Theses

The A1 n experiment at Jefferson Lab Hall A is designed to precisely measure the virtual photon asymmetry of neutrons in the Deep Inelastic Scattering (DIS) region using Hall A polarized 3He target and BigBite spectrometers. Even though both electrons and pions will be scattered, the BigBite spectrometer is designed to measure electrons only. Thus the Gas Ring Imaging Cherenkov (GRINCH) detector is vital, given its capacity to reject pions. The standard Fastbus Data Acquisition (DAQ) system used at Hall A lacks efficiency facing the increasing beam intensity. Thus it is impossible to generate directly a trigger for ...


Quantifying The Sensitivity Of Big Bang Nucleosynthesis To Isospin Breaking, Matthew Ramin Hamedani Heffernan 2016 College of William and Mary

Quantifying The Sensitivity Of Big Bang Nucleosynthesis To Isospin Breaking, Matthew Ramin Hamedani Heffernan

College of William & Mary Undergraduate Honors Theses

We perform a quantitative study of the sensitivity of Big Bang Nucleosynthesis (BBN) to the two sources of isospin breaking in the Standard Model (SM), the splitting between the down and up quark masses, delta_q = 1/2 (m_d - m_u) and the electromagnetic coupling constant, alpha_fs. To very good approximation, the neutron-proton mass splitting, delta m = m_n - m_p, depends linearly upon these two quantities. In turn, BBN is very sensitive to m. A simultaneous study of both of these sources of isospin violation had not yet been performed.

Quantifying the simultaneous sensitivity of BBN to delta_q and alpha_fs. is interesting as ...


Control System Requirements For A Nuclear Thermal Propulsion System, Adam Hasse, Michael Smith, Bradley Pershke, Andrew Adams, Stephen Gilliam 2016 University of Tennessee, Knoxville

Control System Requirements For A Nuclear Thermal Propulsion System, Adam Hasse, Michael Smith, Bradley Pershke, Andrew Adams, Stephen GilliAm

University of Tennessee Honors Thesis Projects

No abstract provided.


Fundamental Physics With Cold Neutron Beams, Kyle Brandon Grammer 2016 University of Tennessee - Knoxville

Fundamental Physics With Cold Neutron Beams, Kyle Brandon Grammer

Doctoral Dissertations

The neutron exhibits rich physics both as a tool for studying materials, particle and nuclear physics, as well as the object of experimental study. The neutron lifetime is an important input to Big Bang Nucleosynthesis models and is currently known only to approximately 0.3\% with the most precise measurements from two different experimental techniques in disagreement by more than 3$\sigma$ [sigma]. Parity violation has been the subject of study since its discovery in 1957. Parity violation experiments provide access to studying the hadronic weak interaction, which is otherwise suppressed by several orders of magnitude below that of the ...


An Old And New Start To Russian—United States Nuclear Arms Control Agreements, Samantha Pitz 2016 SIT Graduate Institute - Study Abroad

An Old And New Start To Russian—United States Nuclear Arms Control Agreements, Samantha Pitz

Independent Study Project (ISP) Collection

The Russian Federation and the United States of America signed on April 8, 2010 the New START nuclear arms control treaty. The New START treaty replaced the lackluster SORT treaty in order to establish a nuclear agreement that would put new limits on numbers of weapons and delivery vehicles while also establishing an innovative framework for transparency and data transfer to allow confidence building between two countries that have not always seen eye-to-eye. Through academic analysis, treaty text, and four formal interviews, the context and trajectory of Russian-United States’ arms control treaties has formed to portray New START as a ...


Hard Qcd Processes In The Nuclear Medium, Adam Freese 2016 Florida International University

Hard Qcd Processes In The Nuclear Medium, Adam Freese

FIU Electronic Theses and Dissertations

The environment inside the atomic nucleus is one of the most fascinating arenas for the study of quantum chromodynamics (QCD). The strongly-interacting nature of the nuclear medium affects the nature of both QCD processes and the quark-gluon structure of hadrons, allowing several unique aspects of the strong nuclear force to be investigated in reactions involving nuclear targets. The research presented in this dissertation explores two aspects of nuclear QCD: firstly, the partonic structure of the nucleus itself; and secondly, the use of the nucleus as a micro-laboratory in which QCD processes can be studied.

The partonic structure of the nucleus ...


The Gluex Start Counter & Beam Asymmetry $\Sigma$ In Single $\Pi^{0}$ Photoproduction, Eric J. Pooser 2016 Florida International University

The Gluex Start Counter & Beam Asymmetry $\Sigma$ In Single $\Pi^{0}$ Photoproduction, Eric J. Pooser

FIU Electronic Theses and Dissertations

The GlueX experiment aims to study meson photoproduction while utilizing the coherent bremsstrahlung technique to produce a 9 GeV linearly polarized photon beam incident on a liquid $\mathrm{H_{2}}$ target. A Start Counter detector was fabricated to properly identify the accelerator electron beam buckets and to provide accurate timing information. The Start Counter detector was designed to operate at photon intensities of up to $\mathrm{10^{8}\gamma/s}$ in the coherent peak and provides a timing resolution $\mathrm{\sim 300\ ps}$ so as to provide successful identification of the electron beam buckets to within 99\% accuracy. Furthermore, the ...


Archive - A Data Management Program, James Devilbiss, C. Steven Whisnant, Yasmeen Shorish 2016 James Madison University

Archive - A Data Management Program, James Devilbiss, C. Steven Whisnant, Yasmeen Shorish

Yasmeen Shorish

To meet funding agency requirements, a portable data management solution is presented for small research groups. The database created is simple, searchable, robust, and can reside across multiple hard drives. Employing a standard metadata schema for all data, the database ensures a high level of standardization, findability, and organization. The software is written in Perl, runs on UNIX, and presents a web-based user interface. It uses a fast, portable log-in scheme, making it easy to export to other locations. As research continues to move towards more open data sharing and reproducibility, this database solution is agile enough to accommodate external ...


Daejeon16 Nn Interaction Software, A. M. Shirokov, I. J. Shin, Y. Kim, M. Sosonkina, P. Maris, James P. Vary 2016 Iowa State University

Daejeon16 Nn Interaction Software, A. M. Shirokov, I. J. Shin, Y. Kim, M. Sosonkina, P. Maris, James P. Vary

Energy Datasets

A Fortran subroutine that generates harmonic oscillator matrix elements of the nucleon-nucleon interaction, Daejeon16, is provided.


Elastic Compton Scattering From Deuterium Near 100 Mev, Khayrullo Shoniyozov 2016 University of Kentucky

Elastic Compton Scattering From Deuterium Near 100 Mev, Khayrullo Shoniyozov

Theses and Dissertations--Physics and Astronomy

Tagged photons from 81 to 116 MeV were used to measure elastic Compton scat- tering cross sections from deuterium and carbon targets at the MAX-lab facility in Lund. Scattered gamma rays were detected in three very large NaI(Tl) crystals with sufficient energy resolution to isolate deuterium elastic yields at scattering angles of 60°, 90°, 120° and 150°. Calculations indicate that back-angle Compton scattering on deuterium in this energy range is sensitive to the electric and magnetic polarizabilities of the nucleon. Results of this research were obtained with improved beam tagging system conditions compared to previous elastic Compton scattering experiments ...


Measurements Of Photon Beam Intensity At The High Intensity Gamma-Ray Source (Higs) Facility For Astrophysically Relevant Photodisintegration Reaction Cross Section, Evan G. Meekins 2016 James Madison University

Measurements Of Photon Beam Intensity At The High Intensity Gamma-Ray Source (Higs) Facility For Astrophysically Relevant Photodisintegration Reaction Cross Section, Evan G. Meekins

Senior Honors Projects

How nuclear reactions in stars and stellar explosions such as supernovae have forged the elements out of hydrogen and helium leftover from the Big Bang is a longstanding, still timely research topic in nuclear astrophysics. Although there is a fairly complete understanding of the production of the chemical elements and their isotopes up to iron by nuclear fusion in stars, important details concerning the production of the elements from iron to uranium remain puzzling. Current knowledge is that the nucleosynthesis beyond iron proceeds mainly via neutron capture reactions and subsequent electron decays to stability. However, some 35 proton-rich stable isotopes ...


Hadron Physics In Tests Of Fundamental Symmetries, Chien Yeah Seng 2016 University of Massachusetts Amherst

Hadron Physics In Tests Of Fundamental Symmetries, Chien Yeah Seng

Doctoral Dissertations May 2014 - current

Low energy precision tests of fundamental symmetries provide excellent probes for the Beyond Standard Model Physics. Theoretical interpretations of these experiments often involve the application of non-perturbative Quantum Chromodynamics in the study of hadronic matrix elements that may either serve as signals of new physics or Standard Model backgrounds. In this work I present a series of studies on different hadronic matrix elements using various low-energy effective approaches to Quantum Chromodynamics, and discuss the impact of these studies on our knowledge of Standard Model and Beyond Standard Model physics.


Anyonic Superconductivity In A Modified Large-U Hubbard Model, Asim Gangopadhyaya, Prasanta Panigrahi 2015 Loyola University Chicago

Anyonic Superconductivity In A Modified Large-U Hubbard Model, Asim Gangopadhyaya, Prasanta Panigrahi

Asim Gangopadhyaya

A modified large-U Hubbard model at half filling is analyzed by a mean-field approach. Preserving a local U(1) symmetry of the action, the fluctuations about half filling are studied in the spirit of the commensurate-flux-phase condition. The fluctuations then contribute a Chern-Simons term to the tree-level Lagrangian with a coefficient appropriate to that of a half fermion. With the Coulomb repulsion term, we study the low-energy excitations of the model and show the existence of superconductivity in the presence of a four-Fermi interaction term.


Nsg Membership Or Disarmament Plan For Pakistan?, Shams Zaman 2015 National Defence University, Islamabad, Pakistan

Nsg Membership Or Disarmament Plan For Pakistan?, Shams Zaman

Mr. Shams uz Zaman

Pakistan should not rush for NSG membership. Inclusion of Pakistan in the NSG would ostensibly ease access to some dual use technologies for its safeguarded nuclear reactors, but that should not come at the cost of gradual disarmament.


Methodology For Generating Simplified Cross Section Data Sets For Neutron Transport Calculations, Thomas Jay Harrison 2015 University of Tennessee - Knoxville

Methodology For Generating Simplified Cross Section Data Sets For Neutron Transport Calculations, Thomas Jay Harrison

Doctoral Dissertations

Neutron shielding problems involve radiation transport calculations over a wide range of energies. Fission neutrons have initial energy on the order of MeV, fusion neutrons have initial energy on the order of 10s of MeV, and space-origin neutrons have initial energy on the order of 100s of MeV or higher. Shielding calculations must track the neutrons from their initial energies until they are no longer of interest; for deep-penetration neutrons, this final energy can be on the order of eV before the neutron is no longer tracked. Thus, for deep-penetration space radiation shielding problems, the calculation may require tracking the ...


Installation And Alignment Of The N3he Experiment, Eric Lee Plemons 2015 University of Tennessee - Knoxville

Installation And Alignment Of The N3he Experiment, Eric Lee Plemons

Masters Theses

The n3He experiment is designed to probe the hadronic weak interaction by measuring the parity violating asymmetry between the spin of incoming neutrons and the momentum of outgoing protons following the nuclear break up of a helium three upon absorbing a neutron. Cold neutrons from the SNS are first polarized then allowed to impact a target chamber filled with helium three where the reaction occurs. Energetic particles resulting from the nuclear breakup ionize the helium three gas and are thereby detected as currents by an array of signal wires within the target chamber. In order to make a statistics limited ...


Predictive Modeling Of Terrestrial Radiation Exposure From Geologic Materials, Daniel A. Haber 2015 University of Nevada, Las Vegas

Predictive Modeling Of Terrestrial Radiation Exposure From Geologic Materials, Daniel A. Haber

UNLV Theses, Dissertations, Professional Papers, and Capstones

Aerial gamma ray surveys are an important tool for national security, scientific, and industrial interests in determining locations of both anthropogenic and natural sources of radioactivity. There is a relationship between radioactivity and geology and in the past this relationship has been used to predict geology from an aerial survey. The purpose of this project

is to develop a method to predict the radiologic exposure rate of the geologic materials in an area by creating a model using geologic data, images from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), geochemical data, and pre-existing low spatial resolution aerial surveys ...


Effective Field Theory Approach To Collective Motion In Atomic Nuclei, Eduardo Antonio Coello Perez 2015 University of Tennessee - Knoxville

Effective Field Theory Approach To Collective Motion In Atomic Nuclei, Eduardo Antonio Coello Perez

Doctoral Dissertations

Collective motion in heavy nuclei has been studied within collective and algebraic models, and within density functional theory. While they reproduce the energy spectra of these systems, their predictions for some electromagnetic transitions and moments do not lie within experimental uncertainty; in other words, these predictions are inconsistent with experimental data. An effective field theory approach to collective motion in heavy nuclei solves this long standing problem. Based on symmetry arguments only, the effective field theories, constructed as expansions in powers of a small parameter, consistently describe the energy spectra of nuclei exhibiting collective motion at low order in the ...


Distributions Of Long-Lived Radioactive Nuclei Provided By Star-Forming Environments, Marco Fatuzzo, Fred Adams 2015 Xavier University - Cincinnati

Distributions Of Long-Lived Radioactive Nuclei Provided By Star-Forming Environments, Marco Fatuzzo, Fred Adams

Faculty Scholarship

Radioactive nuclei play an important role in planetary evolution by providing an internal heat source, which affects planetary structure and helps facilitate plate tectonics. A minimum level of nuclear activity is thought to be necessary—but not sufficient—for planets to be habitable. Extending previous work that focused on short-lived nuclei, this paper considers the delivery of long-lived radioactive nuclei to circumstellar disks in star forming regions. Although the long-lived nuclear species are always present, their abundances can be enhanced through multiple mechanisms. Most stars form in embedded cluster environments, so that disks can be enriched directly by intercepting ejecta ...


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