# Nuclear Commons™

## All Articles in Nuclear

1,211 full-text articles. Page 1 of 31.

Conducting Nuclear Security Culture Self-Assessments In Nuclear Research Facilities Using The Iaea Methodology, 2018 National Nuclear Energy Agency of Indonesia (BATAN)

#### Conducting Nuclear Security Culture Self-Assessments In Nuclear Research Facilities Using The Iaea Methodology, Anhar Riza Antariksawan, Khairul Khairul, Heru Umbara, Endang Kristuti, Bayu Purnomo

##### International Journal of Nuclear Security

The National Nuclear Energy Agency of Indonesia (BATAN) has promoted the culture and assessment of nuclear security in Indonesia since 2010. After conducting a successful trial assessment in 2012, BATAN performed a second self-assessment in 2015 in three nuclear facilities. The assessment's methodology followed the guidelines set by the International Atomic Energy Agency (IAEA). The objective of this paper is to demonstrate the techniques used in applying the IAEA methodology and to discuss the primary outcomes of the assessment. The data collection consisted of surveys, interviews, document reviews, and observations. A total of about 50% of the three facilities ...

2018 Southern Methodist University

#### The Impact Of Ppb W/Z Lhc Data On Ncteq15 Parton Distribution Functions With An Emphasis On Refitting The Ncteq15 Npdf Set, Eric Godat

##### Physics Theses and Dissertations

As the LHC experiments increase their statistics and reduce their systematics, it is in- creasingly important to reduce the theoretical uncertainties so we can perform precision com- parisons. The parton distribution functions (PDFs) which describe the hadronic structure of protons and nuclei are the critical link between the experimental data and the proposed theoretical models; hence, a better understanding of the PDFs is essential for improved pre- dictions. Nuclear PDFs, in particular, have proven valuable in this regard, especially for flavor differentiation. I introduce ”nCTEQ+LHC,” the first PDF set fit using the nCTEQ formalism to include data from the ...

2018 College of William and Mary

#### Spectral Analysis Of Lattice Qcd Two-Point Correlation Functions, Elena Amparo

We extracted a discrete energy spectrum corresponding to scattering of two pions in a finite volume in Quantum Chromodynamics by analyzing matrices of two-point correlation functions computed within lattice QCD. We solved the generalized eigenvalue problem $C(t)v=\lambda C(t_0)v$, where the eigenvectors correspond to the optimal linear combination of basis operators to interpolate each state in the spectrum and the time dependence of the eigenvalues is controlled by the state energy. In order to solve the generalized eigenvalue problem, we used the properties of positive definite matrices to decompose $C(t_0)$ into its eigensystem and rewrite ...

Developing Kenya’S Educational Capacity In Nuclear Security Through Nuclear Forensics Research, 2018 Department of Physics, University of Nairobi, Kenya

#### Developing Kenya’S Educational Capacity In Nuclear Security Through Nuclear Forensics Research, Hudson Kalambuka Angeyo

##### International Journal of Nuclear Security

Nuclear energy’s distinctive characteristics give rise to special educational requirements. These requirements are necessary to not only address the danger of nuclear proliferation, but also to build capacity for a secure nuclear fuel circle. In this paper, I assess the status of educational capacity in nuclear security both in response to, and in support of, Kenya’s nuclear power program. I highlight the nuclear security educational infrastructure’s key features in the context of nuclear power, noting the low capacity at Kenyan universities. I identify the steps required to ensure that the country’s dynamic nuclear regulatory infrastructural framework ...

Magnetic Field In Expanding Quark-Gluon Plasma, 2018 Iowa State University

#### Magnetic Field In Expanding Quark-Gluon Plasma, Evan Stewart, Kirill Tuchin

##### Physics and Astronomy Publications

Intense electromagnetic fields are created in the quark-gluon plasma by the external ultrarelativistic valence charges. The time evolution and the strength of this field are strongly affected by the electrical conductivity of the plasma. Yet, it has recently been observed that the effect of the magnetic field on the plasma flow is small. We compute the effect of plasma flow on magnetic field and demonstrate that it is less than 10%. These observations indicate that the plasma hydrodynamics and the dynamics of electromagnetic field decouple. Thus, it is a very good approximation, on the one hand, to study QGP in ...

Timelike Compton Scattering In The Gluex Experiment At Jefferson Lab, 2018 College of William and Mary

#### Timelike Compton Scattering In The Gluex Experiment At Jefferson Lab, Alexandra Cramer

The structure of protons is a point of interest in nuclear physics due to the lack of consensus between the cumulative spin of a proton and the sum of the spins of its constituent quarks. In the GlueX Experiment at the Jefferson Lab Continuous Electron Beam Accelerator Facility (CEBAF), a particle physics process known as Timelike Compton Scattering (TCS), given by the reaction 𝛾𝑝 → 𝑝𝑒+𝑒-, can be used to help potentially explain this discrepancy. With an eventual goal of providing a comparison of the experimental GlueX TCS data to Generalized Parton Distribution (GPD) models, initial research focused on isolating ...

2018 NEREC Research Fellow

#### The "Double Standard" Of Nonproliferation: Regime Type And The U.S. Response To Nuclear Weapons Program, Alina Shymanska

##### International Journal of Nuclear Security

There is no doubt that the NPT regime is far from being equal for all states involved. As the predominant hegemonic power since WWII, the United States plays a major role in deciding the fates of non-great power proliferators. This article tries to find the logical explanation of the phenomenon whereby some nuclear proliferators are absolved regardless of their active accumulation of nuclear arsenals while others are labeled as “rogue states” and ordered to disarm. The article suggests that a particular proliferator’s political regime could affect the way in which its state is approached by the U.S., known ...

2018 Iowa State University

#### The Impact Of Domain Walls On The Chiral Magnetic Effect In Hot Qcd Matter, Kirill Tuchin

##### Physics and Astronomy Publications

The Chiral Magnetic Effect (CME) -- the separation of positive and negative electric charges along the direction of the external magnetic field in quark-gluon plasma and other topologically non-trivial media -- is a consequence of the coupling of electrodynamics to the topological gluon field fluctuations that form metastable CP-odd domains. In phenomenological models it is usually assumed that the domains are uniform and the influence of the domain walls on the electric current flow is not essential. This paper challenges the latter assumption. A simple model consisting of a uniform spherical domain in a uniform time-dependent magnetic field is introduced and analytically ...

The Associations Between Self-Reported Exposure To The Chernobyl Nuclear Disaster Zone And Mental Health Disorders In Ukraine, 2018 Dordt College

#### The Associations Between Self-Reported Exposure To The Chernobyl Nuclear Disaster Zone And Mental Health Disorders In Ukraine, Matthew A. Bolt, Luralyn M. Helming, Nathan L. Tintle

##### Faculty Work Comprehensive List

In 1986, Reactor 4 of the Chernobyl nuclear power plant near Pripyat, Ukraine exploded, releasing highly-radioactive materials into the surrounding environment. Although the physical effects of the disaster have been well-documented, a limited amount of research has been conducted on association of the disaster with long-term, clinically-diagnosable mental health disorders. According to the diathesis–stress model, the stress of potential and unknown exposure to radioactive materials and the ensuing changes to ones life or environment due to the disaster might lead those with previous vulnerabilities to fall into a poor state of mental health. Previous studies of this disaster have ...

Double K-S(0) Photoproduction Off The Proton At Clas, 2018 Old Dominion University

#### Double K-S(0) Photoproduction Off The Proton At Clas, S. Chandavar, J. T. Goetz, K. Hicks, D. Keller, M. C. Kunkel, M. Paolone, D. P. Weygand, K. P. Adhikari, S. Adhikari, Z. Akbar, G. Charles, G. Gavalian, M. Khachatryan, A. Klein, Y. Prok, J. Zhang, Z. W. Zhao, The Clas Collaboration

##### Physics Faculty Publications

The f0(1500) meson resonance is one of several contenders to have significant mixing with the lightest glueball. This resonance is well established from several previous experiments. Here we present the first photoproduction data for the f0(1500) via decay into the K-S(0) K-S(0) channel using the CLAS detector. The reaction γp → fJp → K-S(0) K-S(0) p,where J = 0,2, was measured with photon energies from 2.7–5.1 GeV. A clear peak is seen at 1500 MeV in the background subtracted invariant mass spectra of the two kaons. This is ...

Light-Nuclei Spectra From Chiral Dynamics, 2018 Old Dominion University

#### Light-Nuclei Spectra From Chiral Dynamics, M. Piarulli, A. Baroni, L. Girlanda, A. Kievsky, A. Lovato, Ewing Lusk, L. E. Marcucci, Steven C. Pieper, R. Schiavilla, M, Viviani, R. B. Wiringa

##### Physics Faculty Publications

In recent years local chiral interactions have been derived and implemented in quantum Monte Carlo methods in order to test to what extent the chiral effective field theory framework impacts our knowledge of few- and many-body systems. In this Letter, we present Green's function Monte Carlo calculations of light nuclei based on the family of local two-body interactions presented by our group in a previous paper in conjunction with chiral three-body interactions fitted to bound- and scattering-state observables in the three-nucleon sector. These interactions include Δ intermediate states in their two-pion-exchange components. We obtain predictions for the energy levels ...

Electrodynamics Of Dual Superconducting Chiral Medium, 2018 Iowa State University

#### Electrodynamics Of Dual Superconducting Chiral Medium, Yang Li, Kirill Tuchin

##### Physics and Astronomy Publications

We study the electrodynamics of the chiral medium with electric and magnetic charges using the effective Maxwell-Chern-Simons theory extended to include the magnetic current. The exchange of helicity between the chiral medium and the magnetic field, known as the inverse cascade, is controlled by the chiral anomaly equation. In the presence of the magnetic current, the magnetic helicity is dissipated, so that the inverse cascade stops when the magnetic helicity vanishes while the chiral conductivity reaches a non-vanishing stationary value satisfying sigma(2)(chi) < 4 sigma(e)sigma(m), where sigma(e), sigma(m) and sigma(chi) are the electric, magnetic and chiral conductivities respectively. We argue that this state is superconducting and exhibits the Meissner effect for both electric and magnetic fields. Moreover, this state is stable with respect to small magnetic helicity fluctuations; the magnetic helicity becomes unstable only when the inequality mentioned above is violated.

2018 University of Kentucky

#### Determination Of The Neutron Beta-Decay Asymmetry Parameter A Using Polarized Ultracold Neutrons, Michael A.-P. Brown

##### Theses and Dissertations--Physics and Astronomy

The UCNA Experiment at the Los Alamos Neutron Science Center (LANSCE) is the first measurement of the β-decay asymmetry parameter A0 using polarized ultracold neutrons (UCN). A0 , which represents the parity-violating angular correlation between the direction of the initial neutron spin and the emitted decay electron’s momentum, determines λ = gA /gV , the ratio of the weak axial-vector and vector coupling constants. A high-precision determination of λ is important for weak interaction physics, and when combined with the neutron lifetime it permits an extraction of the CKM matrix element Vud solely from neutron decay ...

2018 University of Kentucky

#### Magnetic Field Design To Reduce Systematic Effects In Neutron Electric Dipole Moment Measurements, James Ryan Dadisman

##### Theses and Dissertations--Physics and Astronomy

Charge-Conjugation (C) and Charge-Conjugation-Parity (CP) Violation is one of the three Sakharov conditions to explain via baryogenesis the observed baryon asymmetry of the universe (BAU). The Standard Model of particle physics (SM) contains sources of CP violation, but cannot explain the BAU. This motivates searches for new physics beyond the standard model (BSM) which address the Sakharov criteria, including high-precision searches for new sources of CPV in systems for which the SM contribution is small, but larger effects may be present in BSM theories. A promising example is the search for the electric dipole moment of the neutron (nEDM), which ...

2018 University of New Hampshire, Durham

#### Exclusive Production Of Phi Vector Meson During Hera-Ii, Brent Lawson

##### Honors Theses and Capstones

The Hadron Electron Ring Accelerator (HERA) in Germany, which ran from 1992 to 2007, is to date the only high energy electron and proton collider. The ZEUS detector at HERA measured the collisions of 27.5 GeV electrons with 920 GeV protons. Elastic vector meson production was measured during the first phase of HERA (HERA-I) from 1992 to 2000 before HERA was upgraded in 2003 (HERA-II) with increased luminosity. The goal of this project was to analyze data collected during the HERA-II run to identify and quantify the exclusive production of the  vector meson. Runs from the ZEUS experiment were ...

Ψ(2s) Versus J/Ψ Suppression In Proton-Nucleus Collisions From Factorization Violating Soft Color, 2018 Old Dominion University

#### Ψ(2s) Versus J/Ψ Suppression In Proton-Nucleus Collisions From Factorization Violating Soft Color, Yan-Qing Ma, Raju Venugopalan, Kazuhiro Watanabe, Hong-Fei Zhang

##### Physics Faculty Publications

We argue that the large suppression of the ψ(2S) inclusive cross section relative to the J/ψ inclusive cross section in proton-nucleus (p+A) collisions can be attributed to factorization breaking effects in the formation of quarkonium. These factorization breaking effects arise from soft color exchanges between charm-anticharm pairs undergoing hadronization and comoving partons that are long lived on time scales of quarkonium formation. We compute the short distance pair production of heavy quarks in the color glass condensate (CGC) effective field theory and employ an improved color evaporation model (ICEM) to describe their hadronization into quarkonium at large ...

High Field Q Slope And The Effect Of Low-Temperature Baking At 3 Ghz, 2018 Old Dominion University

#### High Field Q Slope And The Effect Of Low-Temperature Baking At 3 Ghz, G. Ciovati, G. Eremeev, F. Hannon

##### Physics Faculty Publications

A strong degradation of the unloaded quality factor with field, called high field Q slope, is commonly observed above Bp ≅ 100 mT in elliptical superconducting niobium cavities at 1.3 and 1.5 GHz. In the present experiments several 3 GHz niobium cavities were measured up to and above Bp ≅ 100 mT. The measurements show that a high field Q slope phenomenon limits the field reach at this frequency, that the high field Q slope onset field depends weakly on the frequency, and that the high field Q slope can be removed by the typical empirical solution of ...

Simulation Of Inverse Compton Scattering And Its Implications On The Scattered Linewidth, 2018 Old Dominion University

#### Simulation Of Inverse Compton Scattering And Its Implications On The Scattered Linewidth, N. Ranjan, B. Terzić, G. A. Krafft, V. Petrillo, I. Drebot, L. Serafini

##### Physics Faculty Publications

Rising interest in inverse Compton sources has increased the need for efficient models that properly quantify the behavior of scattered radiation given a set of interaction parameters. The current state-of-the-art simulations rely on Monte Carlo-based methods, which, while properly expressing scattering behavior in high-probability regions of the produced spectra, may not correctly simulate such behavior in low-probability regions (e.g. tails of spectra). Moreover, sampling may take an inordinate amount of time for the desired accuracy to be achieved. In this paper, we present an analytic derivation of the expression describing the scattered radiation linewidth and propose a model to ...

Quantum Monte Carlo Calculations Of Weak Transitions In A=6-10 Nuclei, 2018 Old Dominion University

#### Quantum Monte Carlo Calculations Of Weak Transitions In A=6-10 Nuclei, S. Pastore, A. Baroni, S. Gandolfi, R. Schiavilla, R. B. Wiringa

##### Physics Faculty Publications

Ab initio calculations of the Gamow-Teller (GT) matrix elements in the β decays of 6He and 10C and electron captures in 7Be are carried out using both variational and Green's function Monte Carlo wave functions obtained from the Argonne v18 two-nucleon and Illinois-7 three-nucleon interactions, and axial many-body currents derived from either meson-exchange phenomenology or chiral effective field theory. The agreement with experimental data is excellent for the electron captures in 7Be, while theory overestimates the 6He and 10C data by ~2% and ~10%, respectively. We show that for these systems correlations in the ...

Resonances From Lattice Qcd, 2018 Old Dominion University

#### Resonances From Lattice Qcd, Raúl A. Briceño

##### Physics Faculty Publications

The spectrum of hadron is mainly composed as shortly-lived states (resonance) that decay onto two or more hadrons. These resonances play an important role in a variety of phenomenologically significant processes. In this talk, I give an overview on the present status of a rigorous program for studying of resonances and their properties using lattice QCD. I explain the formalism needed for extracting resonant amplitudes from the finite-volume spectra. From these one can extract the masses and widths of resonances. I present some recent examples that illustrate the power of these ideas. I then explain similar formalism that allows for ...