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Articles 1  30 of 85
FullText Articles in Physics
Changes In The Scattering Phase Shifts For Partial Waves Of Ultracold Particles At Different Energies, Kaaviyan Faezi
Changes In The Scattering Phase Shifts For Partial Waves Of Ultracold Particles At Different Energies, Kaaviyan Faezi
Honors Scholar Theses
At low energies, scattering phase shifts, the difference in phases between the incoming and outgoing spherical waves in scattering, for different partial waves follow a similar pattern. The phase shift curves, which are a function of the angular momentum quantum number for different scattering energy, obtain resonances after reaching their maxima, and as energy is increased, these resonances become smaller and eventually disappear. Using numerical methods involving the use of Chebyshev polynomials, we solve the wave equation for a scattering potential to obtain the radial equation. From the radial equation we then find the scattering phase shift for a particular ...
Consistency Checks For TwoBody FiniteVolume Matrix Elements. Ii. Perturbative Systems, Raúl A. Briceño, Maxwell T. Hansen, Andrew W. Jackura
Consistency Checks For TwoBody FiniteVolume Matrix Elements. Ii. Perturbative Systems, Raúl A. Briceño, Maxwell T. Hansen, Andrew W. Jackura
Physics Faculty Publications
Using the general formalism presented in [Phys. Rev. D 94, 013008 (2016); Phys. Rev. D 100, 034511 (2019)], we study the finitevolume effects for the 2 þ J → 2 matrix element of an external current coupled to a twoparticle state of identical scalars with perturbative interactions. Working in a finite cubic volume with periodicity L, we derive a 1=L expansion of the matrix element through O(1=L^{5}) and find that it is governed by two universal currentdependent parameters, the scalar charge and the threshold two particle form factor. We confirm the result through a numerical study of ...
Heavy Quark Expansion For HeavyLight LightCone Operators, Shuai Zhao
Heavy Quark Expansion For HeavyLight LightCone Operators, Shuai Zhao
Physics Faculty Publications
We generalize the celebrated heavy quark expansion to nonlocal QCD operators. By taking nonlocal heavylight current on the lightcone as an example, we confirm that the collinear singularities are common between QCD operator and the corresponding operator in heavy quark effective theory (HQET), at the leading power of 1/M expansion. Based on a perturbative calculation in operator form at oneloop level, a factorization formula linking QCD and HQET operators is investigated and the matching coefficient is determined. The matching between QCD and HQET lightcone distribution amplitudes (LCDAs) as well as other momentum distributions of hadron can be derived as ...
Spectroscopic Study On Pseudomonas Aeruginosa Biofilm In The Presence Of The AptamerDna Scaffolded Silver Nanoclusters, Bidisha Sengupta, Prakash Adhikari, Esther Mallet, Ronald Havner, Prabhakar Pradhan
Spectroscopic Study On Pseudomonas Aeruginosa Biofilm In The Presence Of The AptamerDna Scaffolded Silver Nanoclusters, Bidisha Sengupta, Prakash Adhikari, Esther Mallet, Ronald Havner, Prabhakar Pradhan
Faculty Publications
We report the effectiveness of silver nanocluster (AgNC) against the biofilm of Pseudomonas aeruginosa (PA). Two DNA aptamers specific for PA and part of their sequences were chosen as templates for growing the AgNC. While circular dichroism (CD) studies determined the presence of secondary structures, UV/Vis absorption, and fluorescence spectroscopic studies confirmed the formation of the fluorescent AgNC on the DNA templates. Furthermore, mesoscopic physicsbased partial wave spectroscopy (PWS) was used to analyze the backscattered light signal that can detect the degree of nanoscale mass density/refractive index fluctuations to identify the biofilm formation, comparatively among the different aptamers ...
LongRange Electroweak Amplitudes Of Single Hadrons From Euclidean FiniteVolume Correlation Functions, Raúl A. Briceño, Zohreh Davoudi, Maxwell T. Hansen, Matthias R. Schindler, Alessandro Baroni
LongRange Electroweak Amplitudes Of Single Hadrons From Euclidean FiniteVolume Correlation Functions, Raúl A. Briceño, Zohreh Davoudi, Maxwell T. Hansen, Matthias R. Schindler, Alessandro Baroni
Physics Faculty Publications
A relation is presented between singlehadron longrange matrix elements defined in a finite Euclidean spacetime and the corresponding infinitevolume Minkowski amplitudes. This relation is valid in the kinematic region where any number of twohadron states can simultaneously go on shell, so that the effects of strongly coupled intermediate channels are included. These channels can consist of nonidentical particles with arbitrary intrinsic spins. The result accommodates general Lorentz structures as well as nonzero momentum transfer for the two external currents inserted between the singlehadron states. The formalism, therefore, generalizes the work by Christ et al. [Phys. Rev. D 91, 114510 (2015 ...
Quasielastic Lepton Scattering And BackToBack Nucleons In The ShortTime Approximation, S. Pastore, J. Carlson, S. Gandolfi, R. Schiavilla, R. B. Wiringa
Quasielastic Lepton Scattering And BackToBack Nucleons In The ShortTime Approximation, S. Pastore, J. Carlson, S. Gandolfi, R. Schiavilla, R. B. Wiringa
Physics Faculty Publications
Understanding quasielastic electron and neutrino scattering from nuclei has taken on new urgency with current and planned neutrino oscillation experiments, and with electron scattering experiments measuring specific final states, such as those involving nucleon pairs in "backtoback" configurations. Accurate manybody methods are available for calculating the response of light (A <= 12) nuclei to electromagnetic and weak probes, but they are computationally intensive and only applicable to the inclusive response. In the present work we introduce a novel approach, based on realistic models of nuclear interactions and currents, to evaluate the shorttime (highenergy) inclusive and exclusive response of nuclei. The approach accounts reliably for crucial twonucleon dynamics, including correlations and currents, and provides information on backtoback nucleons observed in electron and neutrino scattering experiments. We demonstrate that in the quasielastic regime and at moderate momentum transfers both initial and finalstate correlations and twonucleon currents are important for a quantitatively successful description of the inclusive response and finalstate nucleons. Finally, the approach can be extended to include relativistickinematical and dynamicaleffects, at least approximately in the twonucleon sector, and to describe the response in the resonanceexcitation region.
Consistency Checks For TwoBody FiniteVolume Matrix Elements: Conserved Currents And Bound States, Raúl A. Briceño, Maxwell T. Hansen, Andrew W. Jackura
Consistency Checks For TwoBody FiniteVolume Matrix Elements: Conserved Currents And Bound States, Raúl A. Briceño, Maxwell T. Hansen, Andrew W. Jackura
Physics Faculty Publications
Recently, a framework has been developed to study form factors of twohadron states probed by an external current. The method is based on relating finitevolume matrix elements, computed using numerical lattice QCD, to the corresponding infinitevolume observables. As the formalism is complicated, it is important to provide nontrivial checks on the final results and also to explore limiting cases in which more straightforward predictions may be extracted. In this work we provide examples on both fronts. First, we show that, in the case of a conserved vector current, the formalism ensures that the finitevolume matrix element of the conserved charge ...
Comparing Proton Momentum Distributions In A = 2 And 3 Nuclei Via ^{2}H ^{3}H And ^{3}He (E,E′P) Measurements, R. CruzTorres, F. Hauenstein, A. Schmidt, D. Nguyen, D. Abrams, H. Albataineh, S. Alsalmi, D. Androic, K. Aniol, W. Armstrong, J. Arrington, H. Atac, D. Bulumulla, C. E. Hyde, V. Khachatryan, M. N.H. Rashad, L. B. Weinstein, Z. Y. Ye, J. Zhang, Jefferson Lab Hall A Tritium Collaboration
Comparing Proton Momentum Distributions In A = 2 And 3 Nuclei Via 2H 3H And 3He (E,E′P) Measurements, R. CruzTorres, F. Hauenstein, A. Schmidt, D. Nguyen, D. Abrams, H. Albataineh, S. Alsalmi, D. Androic, K. Aniol, W. Armstrong, J. Arrington, H. Atac, D. Bulumulla, C. E. Hyde, V. Khachatryan, M. N.H. Rashad, L. B. Weinstein, Z. Y. Ye, J. Zhang, Jefferson Lab Hall A Tritium Collaboration
Physics Faculty Publications
We report the first measurement of the (e, e' p) reaction crosssection ratios for Helium3 (^{3}He), Tritium (^{3}H), and Deuterium (d). The measurement covered a missing momentum range of 40 ≤ p_{miss} ≤ 550 MeV/c, at large momentum transfer ({Q^{2}} ≈ 1.9 (GeV/c)^{2}) and x_{B} > 1, which minimized contributions from non quasielastic (QE) reaction mechanisms. The data is compared with planewave impulse approximation (PWIA) calculations using realistic spectral functions and momentum distributions. The measured and PWIAcalculated crosssection ratios for ^{3}He/d and ^{3}H/d extend to just above the typical nucleon Fermimomentum ...
Nuclear Theory And Event Generators For ChargeChanging Neutrino Reactions, J. W. Van Orden, T. W. Donnelly
Nuclear Theory And Event Generators For ChargeChanging Neutrino Reactions, J. W. Van Orden, T. W. Donnelly
Physics Faculty Publications
Semiinclusive CCν cross sections based on factorized cross sections are studied for a selection of spectral function models with the objective of facilitating the choice of models for use as input into event generators. The basic formalism for such cross sections is presented along with an introduction to constructing spectral functions for simple models based on the independentparticle shell model, the relativistic Fermi gas model (RFG), and a local density approximation (LDA) based on the RFG. Spectral functions for these models are shown for 16O along with a more sophisticated model which includes nucleonnucleon interactions [AlvarezRuso et al., Prog ...
Muon Capture In Nuclei: An Ab Initio Approach Based On Green's Function Monte Carlo Methods, A. Lovato, N. Rocco, Rocco Schiavilla
Muon Capture In Nuclei: An Ab Initio Approach Based On Green's Function Monte Carlo Methods, A. Lovato, N. Rocco, Rocco Schiavilla
Physics Faculty Publications
An ab initio Green’s function Monte Carlo (GFMC) method is introduced for calculating total rates of muon weak capture in light nuclei with mass number A ≤ 12. As a first application of the method, we perform a calculation of the rate in ^{3}H and ^{4}He in a dynamical framework based on realistic two and threenucleon interactions and realistic nuclear chargechanging weak currents. The currents include one and twobody terms induced by πand ρmeson exchange, and NtoΔ excitation, and are constrained to reproduce the empirical value of the GamowTeller matrix element in tritium. We investigate the sensitivity of ...
Unitarity Of The InfiniteVolume ThreeParticle Scattering Amplitude Arising From A FiniteVolume Formalism, Raúl A. Briceño, Maxwell T. Hansen, Stephen R. Sharpe, Adam P. Szczepaniak
Unitarity Of The InfiniteVolume ThreeParticle Scattering Amplitude Arising From A FiniteVolume Formalism, Raúl A. Briceño, Maxwell T. Hansen, Stephen R. Sharpe, Adam P. Szczepaniak
Physics Faculty Publications
Hansen and Sharpe [Phys. Rev. D 92, 114509 (2015)] derived a relation between the scattering amplitude of three identical bosons,M_{3}, and a real function referred to as the divergencefree K matrix and denoted K_{df;3}. The result arose in the context of a relation between finitevolume energies and K_{df;3}, derived to all orders in the perturbative expansion of a generic lowenergy effective field theory. In this work we set aside the role of the finite volume and focus on the infinitevolume relation between K_{df;3} and M_{3}. We show that, for any real ...
Rotational Quenching Of Hd Induced By Collisions With H2 Molecules, Yier Wan, Nadulvalath Balakrishnan, B. H. Yang, R. C. Forrey, P. C. Stancil
Rotational Quenching Of Hd Induced By Collisions With H2 Molecules, Yier Wan, Nadulvalath Balakrishnan, B. H. Yang, R. C. Forrey, P. C. Stancil
Chemistry and Biochemistry Faculty Publications
Rate coefficients for rotational transitions in HD induced by H2 impact for rotational levels of HD j ≤ 8 and temperatures 10 K ≤ T ≤ 5000 K are reported. The quantum mechanical closecoupling (CC) method and the coupledstates (CS) decoupling approximation are used to obtain the crosssections employing the most recent highly accurate H2–H2 potential energy surface (PES). Our results are in good agreement with previous calculations for lowlying rotational transitions The cooling efficiency of HD compared with H2 and astrophysical applications are briefly discussed.
Structure Of Parton QuasiDistributions And Their Moments, A. V. Radyushkin
Structure Of Parton QuasiDistributions And Their Moments, A. V. Radyushkin
Physics Faculty Publications
We discuss the structure of the parton quasidistributions (quasiPDFs) Q (y, P3) outside the "canonical" 1 <= y <= 1 support region of the usual parton distribution functions (PDFs). Writing the y(n) moments of Q (y, P3) in terms of the combined x(n2l)k(perpendicular to)(2l)moments of the transverse momentum distribution (TMD). F(x,k(perpendicular to)(2)), we establish a connection between the largevertical bar y vertical bar behavior of Q (y, P3) and largek(perpendicular to)(2) behavior of F(x,k(perpendicular to)(2)). In particular, we show that the 1/k(perpendicular to)(2) hard tail of TMDs in QCD results in a slowly decreasing similar to 1/vertical bar y vertical bar behavior of quasiPDFs for large vertical bar y vertical bar that produces infinite y(n) moments of Q(y, P3). We also relate the  1/vertical bar y vertical bar terms with the lnz(3)(2)singularities of the Ioffetime pseudodistributions m(v, z(3)(2)). Converting the operator product expansion for m(v,z(3)(2)) into a matching relation between the quasiPDF Q(y, P3) and the lightcone PDF f (x, mu(2)), we demonstrate that there is no contradiction between the infinite values of the y(n) moments of Q (y, P3) and finite values of the x(n) moments of f (x, mu(2))
Form Factors Of TwoHadron States From A Covariant FiniteVolume Formalism, Alessandro Baroni, Raúl Briceño, Maxwell T. Hansen, Felipe G. OrtegaGama
Form Factors Of TwoHadron States From A Covariant FiniteVolume Formalism, Alessandro Baroni, Raúl Briceño, Maxwell T. Hansen, Felipe G. OrtegaGama
Physics Faculty Publications
In this work we develop a Lorentzcovariant version of the previously derived formalism for relating finitevolume matrix elements to 2 + J → 2 transition amplitudes. We also give various details relevant for the implementation of this formalism in a realistic numerical lattice QCD calculation. Particular focus is given to the role of singleparticle form factors in disentangling finitevolume effects from the triangle diagram that arise when J couples to one of the two hadrons. This also leads to a new finitevolume function, denoted G, the numerical evaluation of which is described in detail. As an example we discuss the determination of ...
Challenges With Large Transverse Momentum In SemiInclusive Deeply Inelastic Scattering, J. O. GonzalezHernandez, T. C. Rogers, N. Sato, B. Wang
Challenges With Large Transverse Momentum In SemiInclusive Deeply Inelastic Scattering, J. O. GonzalezHernandez, T. C. Rogers, N. Sato, B. Wang
Physics Faculty Publications
We survey the current phenomenological status of semiinclusive deeply inelastic scattering at moderate hard scales and in the limit of very large transverse momentum. As the transverse momentum becomes comparable to or larger than the overall hard scale, the differential cross sections should be calculable with fixed order perturbative QCD (pQCD) methods, while small transverse momentum (transversemomentumdependent factorization) approximations should eventually break down. We find large disagreement between HERMES and COMPASS data and fixed order calculations done with modern parton densities, even in regions of kinematics where such calculations should be expected to be very accurate. Possible interpretations are suggested.
Probing HighMomentum Protons And Neutrons In NeutronRich Nuclei, M. Duer, C. L. A. S. Collaboration, O. Hen, E. Piasetzky, H. Hakobyan, L. B. Weistein, M. Braverman, Gerard P. Gilfoyle, Et. Al.
Probing HighMomentum Protons And Neutrons In NeutronRich Nuclei, M. Duer, C. L. A. S. Collaboration, O. Hen, E. Piasetzky, H. Hakobyan, L. B. Weistein, M. Braverman, Gerard P. Gilfoyle, Et. Al.
Physics Faculty Publications
The atomic nucleus is one of the densest and most complex quantummechanical systems in nature. Nuclei account for nearly all the mass of the visible Universe. The properties of individual nucleons (protons and neutrons) in nuclei can be probed by scattering a highenergy particle from the nucleus and detecting this particle after it scatters, often also detecting an additional knockedout proton. Analysis of electron and protonscattering experiments suggests that some nucleons in nuclei form closeproximity neutron–proton pairs with high nucleon momentum, greater than the nuclear Fermi momentum. However, how excess neutrons in neutronrich nuclei form such closeproximity pairs remains ...
HighBrilliance, HighFlux Compact Inverse Compton Light Source, K. E. Deitrick, G. A. Krafft, B. Terzić, J. R. Delayen
HighBrilliance, HighFlux Compact Inverse Compton Light Source, K. E. Deitrick, G. A. Krafft, B. Terzić, J. R. Delayen
Physics Faculty Publications
The Old Dominion University Compact Light Source (ODU CLS) design concept is presenteda compact Inverse Compton Light Source (ICLS) with flux and brilliance orders of magnitude beyond conventional laboratoryscale sources and greater than other compact ICLS designs. This concept utilizes the physics of inverse Compton scattering of an extremely low emittance electron beam by a laser pulse of rms length of approximately twothirds of a picosecond (2/3 ps). The accelerator is composed of a superconducting radio frequency (SRF) reentrant gun followed by four doublespoke SRF cavities. After the linac are three quadrupole magnets to focus the electron beam to ...
Probing HighMomentum Protons And Neutrons In NeutronRich Nuclei, The Clas Collaboration, L. B. Weinstein, S. Bültmann, D. Bulumulla, G. Charles, G. Dodge, F. Hauenstein, C. E. Hyde, A. Klein, S. Nadeeshani, Y. Prok, Z. W. Zhao
Probing HighMomentum Protons And Neutrons In NeutronRich Nuclei, The Clas Collaboration, L. B. Weinstein, S. Bültmann, D. Bulumulla, G. Charles, G. Dodge, F. Hauenstein, C. E. Hyde, A. Klein, S. Nadeeshani, Y. Prok, Z. W. Zhao
Physics Faculty Publications
The atomic nucleus is one of the densest and most complex quantummechanical systems in nature. Nuclei account for nearly all the mass of the visible Universe. The properties of individual nucleons (protons and neutrons) in nuclei can be probed by scattering a highenergy particle from the nucleus and detecting this particle after it scatters, often also detecting an additional knockedout proton. Analysis of electron and protonscattering experiments suggests that some nucleons in nuclei form closeproximity neutron–proton pairs with high nucleon momentum, greater than the nuclear Fermi momentum. However, how excess neutrons in neutronrich nuclei form such closeproximity pairs remains ...
OneLoop Evolution Of Parton PseudoDistribution Functions On The Lattice, Anatoly Radyushkin
OneLoop Evolution Of Parton PseudoDistribution Functions On The Lattice, Anatoly Radyushkin
Physics Faculty Publications
We incorporate recent calculations of oneloop corrections for the reduced Ioffetime pseudodistribution m(v, z(3)(2) thorn to extend the leadinglogarithm analysis of lattice data obtained by Orginos et al. We observe that the oneloop corrections contain a large term reflecting the fact that effective distances involved in the most important diagrams are much smaller than the nominal distance z(3). The large correction in this case may be absorbed into the evolution term, and the perturbative expansion used for extraction of parton densities at the μ ≈ 2 GeV scale is under control. The extracted parton distribution is rather ...
Electron And PositronImpact Ionization Of Inert Gases, R. I. Campeanu, H. R. J. Walters, Colm T. Whelan
Electron And PositronImpact Ionization Of Inert Gases, R. I. Campeanu, H. R. J. Walters, Colm T. Whelan
Physics Faculty Publications
Tripledifferential cross sections (TDCS) are presented for the electron and positron impact ionization of inert gas atoms in a range of geometries where a number of significant few body effects compete to define the shape of the TDCS. Using both positrons and electrons as projectiles has opened up the possibility of performing complementary studies which could effectively isolate competing interactions which cannot be separately detected in an experiment with a single projectile. A comparison is presented between theory and the recent experiments of [Gavin, deLucio, and DuBois, Phys. Rev. A95, 062703 (2017)] for e^{±} and contrasted with the results from ...
Nucleon And Nuclear Structure Through Dilepton Production, I. V. Anikin, N. Baltzell, M. Boer, R. Boussarie, V. M. Braun, S. J. Brodsky, A. Camsonne, W. C. Chang, L. Colaneri, C. E. Hyde
Nucleon And Nuclear Structure Through Dilepton Production, I. V. Anikin, N. Baltzell, M. Boer, R. Boussarie, V. M. Braun, S. J. Brodsky, A. Camsonne, W. C. Chang, L. Colaneri, C. E. Hyde
Physics Faculty Publications
Transverse momentum distributions and generalized parton distributions provide a comprehensive framework for the threedimensional imaging of the nucleon and the nucleus experimentally using deeply virtual semiexclusive and exclusive processes. The advent of combined high luminosity facilities and large acceptance detector capabilities enables experimental investigation of the partonic structure of hadrons with timelike virtual probes, in complement to the rich ongoing spacelike virtual probe program. The merits and benefits of the dilepton production channel for nuclear structure studies are discussed within the context of the International Workshop on Nucleon and Nuclear Structure through Dilepton Production taking place at the European Center ...
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
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 stateoftheart simulations rely on Monte Carlobased methods, which, while properly expressing scattering behavior in highprobability regions of the produced spectra, may not correctly simulate such behavior in lowprobability 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 ...
Search For ThreeNucleon ShortRange Correlations In Light Nuclei, Z. Ye, P. Solvignon, D. Nguten, P. Aguilera, Z. Ahmed, H. Albataineh, K. Allada, B. Anderson, D. Anez, L. B. Weinstein
Search For ThreeNucleon ShortRange Correlations In Light Nuclei, Z. Ye, P. Solvignon, D. Nguten, P. Aguilera, Z. Ahmed, H. Albataineh, K. Allada, B. Anderson, D. Anez, L. B. Weinstein
Physics Faculty Publications
We present new data probing shortrange correlations (SRCs) in nuclei through the measurement of electron scattering off highmomentum nucleons in nuclei. The inclusive ^{4}He/^{3}He cross section ratio is observed to be both x and Q^{2} independent for 1.5 < x < 2, confirming the dominance of twonucleon shortrange correlations. For x > 2, our data support the hypothesis that a previous claim of threenucleon correlation dominance was an artifact caused by the limited resolution of the measurement. While 3NSRCs appear to have an important contribution, our data show that isolating 3NSRCs is significantly more complicated than for 2NSRCs.
Numerical Study Of The Relativistic ThreeBody Quantization Condition In The Isotropic Approximation, Raúl A. Briceño, Maxwell T. Hansen, Stephen R. Sharpe
Numerical Study Of The Relativistic ThreeBody Quantization Condition In The Isotropic Approximation, Raúl A. Briceño, Maxwell T. Hansen, Stephen R. Sharpe
Physics Faculty Publications
We present numerical results showing how our recently proposed relativistic threeparticle quantization condition can be used in practice. Using the isotropic (generalized swave) approximation, and keeping only the leading terms in the effective range expansion, we show how the quantization condition can be solved numerically in a straightforward manner. In addition, we show how the integral equations that relate the intermediate threeparticle infinitevolume scattering quantity, K_{df,}3, to the physical scattering amplitude can be solved at and below threshold. We test our methods by reproducing known analytic results for the 1/L expansion of the threshold state, the volume ...
Lattice Qcd Exploration Of Parton PseudoDistribution Functions, Kostas Orginos, Anatoly Radyushkin, Joseph Karpie, Savvas Zafeiropoulos
Lattice Qcd Exploration Of Parton PseudoDistribution Functions, Kostas Orginos, Anatoly Radyushkin, Joseph Karpie, Savvas Zafeiropoulos
Physics Faculty Publications
We demonstrate a new method of extracting parton distributions from lattice calculations. The starting idea is to treat the generic equaltime matrix element M(Pz(3), z(3)(2)) as a function of the Ioffe time nu = Pz(3) and the distance z(3). The next step is to divide M(Pz(3), z(3)(2)) by the restframe density M(0, z(3)(2)). Our lattice calculation shows a linear exponential z(3)dependence in the restframe function, expected from the Z(z(3)(2)) factor generated by the gauge link. Still, we observe that the ratio M (Pz ...
Inverse Design Of Perfectly Transmitting Eigenchannels In Scattering Media, Milan Koirala, Raktim Sarma, Hui Cao, Alexey Yamilov
Inverse Design Of Perfectly Transmitting Eigenchannels In Scattering Media, Milan Koirala, Raktim Sarma, Hui Cao, Alexey Yamilov
Physics Faculty Research & Creative Works
Lightmatter interactions inside a turbid medium can be controlled by tailoring the spatial distribution of energy density throughout the system. Wavefront shaping allows selective coupling of incident light to different transmission eigenchannels, producing dramatically different spatial intensity profiles. In contrast to the density of transmission eigenvalues that is dictated by the universal bimodal distribution, the spatial structures of the eigenchannels are not universal and depend on the confinement geometry of the system. Here, we develop and verify a model for the transmission eigenchannel with the corresponding eigenvalue close to unity. By projecting the original problem of twodimensional diffusion in a ...
Angular Distribution Of SinglePhoton Superradiance In A Dilute And Cold Atomic Ensemble, A. S. Kuraptsev, I. M. Sokolov, M. D. Havey
Angular Distribution Of SinglePhoton Superradiance In A Dilute And Cold Atomic Ensemble, A. S. Kuraptsev, I. M. Sokolov, M. D. Havey
Physics Faculty Publications
On the basis of a quantum microscopic approach we study the dynamics of the afterglow of a dilute Gaussian atomic ensemble excited by pulsed radiation. Taking into account the vector nature of the electromagnetic field we analyze in detail the angular and polarization distribution of singlephoton superradiance of such an ensemble. The dependence of the angular distribution of superradiance on the length of the pulse and its carrier frequency as well as on the size and the shape of the atomic clouds is studied. We show that there is substantial dependence of the superradiant emission on the polarization and the ...
Rosenbluth Separation Of The Π0 Electroproduction Cross Section Off The Neutron, M. Mazouz, Z. Ahmed, H. Albataineh, K. Allada, K. A. Aniol, V. Bellini, M. Benali, W. Boeglin, P. Bertin, M. Canan, C. E. Hyde, S. Koirala, M. N. H. Rashad
Rosenbluth Separation Of The Π0 Electroproduction Cross Section Off The Neutron, M. Mazouz, Z. Ahmed, H. Albataineh, K. Allada, K. A. Aniol, V. Bellini, M. Benali, W. Boeglin, P. Bertin, M. Canan, C. E. Hyde, S. Koirala, M. N. H. Rashad
Physics Faculty Publications
We report the first longitudinaltransverse separation of the deeply virtual exclusive π^{0} electroproduction cross section off the neutron and coherent deuteron. The corresponding four structure functions dσ_{L}/dt, dσ_{T}/dt, dσ_{LT}/dt, and dσ_{TT}/dt are extracted as a function of the momentum transfer to the recoil system at Q^{2} = 1.75 GeV^{2} and x_{B} = 0.36. The ed > edπ^{0} cross sections are found compatible with the small values expected from theoretical models. The en > enπ^{0} cross sections show a dominance from the response to transversely polarized photons, and ...
Measuring The Reflection Matrix Of A Rough Surface, Kenneth W. Burgi, Michael A. Marciniak, Mark E. Oxley, Stephen E. Nauyoks
Measuring The Reflection Matrix Of A Rough Surface, Kenneth W. Burgi, Michael A. Marciniak, Mark E. Oxley, Stephen E. Nauyoks
Faculty Publications
Phase modulation methods for imaging around corners with reflectively scattered light required illumination of the occluded scene with a light source either in the scene or with direct line of sight to the scene. The RM (reflection matrix) allows control and refocusing of light after reflection, which could provide a means of illuminating an occluded scene without access or line of sight. Two optical arrangements, one focalplane, the other an imaging system, were used to measure the RM of five different roughsurface reflectors. Intensity enhancement values of up to 24 were achieved. Surface roughness, correlation length, and slope were examined ...
Analysis Of Beam Deflection Measurements In The Presence Of Linear Absorption, Manuel R. Ferdinandus, Jennifer Reed, Kent L. Averett, F. Kenneth Hopkins, Augustine Urbas
Analysis Of Beam Deflection Measurements In The Presence Of Linear Absorption, Manuel R. Ferdinandus, Jennifer Reed, Kent L. Averett, F. Kenneth Hopkins, Augustine Urbas
Faculty Publications
We develop a series of analytical approximations allowing for rapid extraction of the nonlinear parameters from beam deflection measurements. We then apply these approximations to the analysis of cadmium silicon phosphide and compare the results against previously published parameter extraction methods and find good agreement for typical experimental conditions.