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FullText Articles in Physics
Quantum Interference Of K Capture In Energetic G E31+(1s)Kr Collisions, R. Schuch, Michael Schulz, For Full List Of Authors, See Publisher's Website.
Quantum Interference Of K Capture In Energetic G E31+(1s)Kr Collisions, R. Schuch, Michael Schulz, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We have measured characteristic K x rays in coincidence with the scattered particles from collisions of hydrogenlike Ge ions with Kr atoms. The ions were first accelerated to 8.6 MeV/amu, poststripped to Hlike charge state, and decelerated to around 2.5 MeV/amu. From the measurements the probabilities for Kshell to Kshell charge transfer as a function of collision impact parameters were obtained. The probabilities show an onset of oscillations which are interpreted as quantum interference between the Kshell to Kshell electron transfer amplitudes in two spatially separated coupling regions in the incoming and outgoing parts of the ...
Model Comparison From LigoVirgo Data On Gw170817'S Binary Components And Consequences For The Merger Remnant, B. P. Abbott, R. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Model Comparison From LigoVirgo Data On Gw170817'S Binary Components And Consequences For The Merger Remnant, B. P. Abbott, R. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
GW170817 is the very first observation of gravitational waves originating from the coalescence of two compact objects in the mass range of neutron stars, accompanied by electromagnetic counterparts, and offers an opportunity to directly probe the internal structure of neutron stars. We perform Bayesian model selection on a wide range of theoretical predictions for the neutron star equation of state. For the binary neutron star hypothesis, we find that we cannot rule out the majority of theoretical models considered. In addition, the gravitationalwave data alone does not rule out the possibility that one or both objects were lowmass black holes ...
The Conundrum Of Relaxation Volumes In FirstPrinciples Calculations Of Charged Defects In Uo₂, Anuj Goyal, Kiran Mathew, Richard G. Hennig, Aleksandr V. Chernatynskiy
The Conundrum Of Relaxation Volumes In FirstPrinciples Calculations Of Charged Defects In Uo₂, Anuj Goyal, Kiran Mathew, Richard G. Hennig, Aleksandr V. Chernatynskiy
Physics Faculty Research & Creative Works
The defect relaxation volumes obtained from densityfunctional theory (DFT) calculations of charged vacancies and interstitials are much larger than their neutral counterparts, seemingly unphysically large. We focus on UO2 as our primary material of interest, but also consider Si and GaAs to reveal the generality of our results. In this work, we investigate the possible reasons for this and revisit the methods that address the calculation of charged defects in periodic DFT. We probe the dependence of the proposed energy corrections to charged defect formation energies on relaxation volumes and find that corrections such as potential alignment remain ambiguous with ...
Search For Gravitational Waves From Scorpius X1 In The Second Advanced Ligo Observing Run With An Improved Hidden Markov Model, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Search For Gravitational Waves From Scorpius X1 In The Second Advanced Ligo Observing Run With An Improved Hidden Markov Model, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We present results from a semicoherent search for continuous gravitational waves from the lowmass xray binary Scorpius X1, using a hidden Markov model (HMM) to track spin wandering. This search improves on previous HMMbased searches of LIGO data by using an improved frequency domain matched filter, the Jstatistic, and by analyzing data from Advanced LIGO's second observing run. In the frequency range searched, from 60 to 650 Hz, we find no evidence of gravitational radiation. At 194.6 Hz, the most sensitive search frequency, we report an upper limit on gravitational wave strain (at 95% confidence) of h_{0 ...}
Lattice Thermal Conductivity Of Quartz At High Pressure And Temperature From The Boltzmann Transport Equation, Xue Xiong, Eugene J. Ragasa, Aleksandr V. Chernatynskiy, Dawei Tang, Simon R. Phillpot
Lattice Thermal Conductivity Of Quartz At High Pressure And Temperature From The Boltzmann Transport Equation, Xue Xiong, Eugene J. Ragasa, Aleksandr V. Chernatynskiy, Dawei Tang, Simon R. Phillpot
Physics Faculty Research & Creative Works
The thermal conductivities along the basal and hexagonal directions of αquartz silica, the lowtemperature form of crystalline SiO_{2}, are predicted from the solution of the Boltzmann transport equation combined with the van Beest, Kramer, and van Santen potential for the temperature up to 900 K and the pressure as high as 4 GPa. The thermal conductivities at atmospheric pressure, which show a negative and nonlinear dependence on temperature, are in reasonable agreement with the experimental data. The influence of pressure on thermal conductivity is positive and linear. The pressure (P) and temperature (T) dependences of the thermal conductivity (λ ...
Local Orbital Degeneracy Lifting As A Precursor To An OrbitalSelective Peierls Transition, E. S. Bozin, W. G. Yin, R. J. Koch, M. Abeykoon, Yew San Hor, H. Zheng, H. C. Lei, C. Petrovic, J. F. Mitchell, S. J. L. Billinge
Local Orbital Degeneracy Lifting As A Precursor To An OrbitalSelective Peierls Transition, E. S. Bozin, W. G. Yin, R. J. Koch, M. Abeykoon, Yew San Hor, H. Zheng, H. C. Lei, C. Petrovic, J. F. Mitchell, S. J. L. Billinge
Physics Faculty Research & Creative Works
Fundamental electronic principles underlying all transition metal compounds are the symmetry and filling of the delectron orbitals and the influence of this filling on structural configurations and responses. Here we use a sensitive local structural technique, xray atomic pair distribution function analysis, to reveal the presence of fluctuating localstructural distortions at high temperature in one such compound, CuIr_{2}S_{4}. We show that this hitherto overlooked fluctuating symmetrylowering is electronic in origin and will modify the energylevel spectrum and electronic and magnetic properties. The explanation is a local, fluctuating, orbitaldegeneracylifted state. The natural extension of our result would be ...
Tests Of General Relativity With The Binary Black Hole Signals From The LigoVirgo Catalog Gwtc1, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Tests Of General Relativity With The Binary Black Hole Signals From The LigoVirgo Catalog Gwtc1, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
The detection of gravitational waves by Advanced LIGO and Advanced Virgo provides an opportunity to test general relativity in a regime that is inaccessible to traditional astronomical observations and laboratory tests. We present four tests of the consistency of the data with binary black hole gravitational waveforms predicted by general relativity. One test subtracts the bestfit waveform from the data and checks the consistency of the residual with detector noise. The second test checks the consistency of the low and highfrequency parts of the observed signals. The third test checks that phenomenological deviations introduced in the waveform model (including in ...
Angular Memory Effect Of Transmission Eigenchannels, Hasan Yllmaz, Chia Wei Hsu, Arthur Goetschy, Stefan Bittner, Stefan Rotter, Alexey Yamilov, Hui Cao
Angular Memory Effect Of Transmission Eigenchannels, Hasan Yllmaz, Chia Wei Hsu, Arthur Goetschy, Stefan Bittner, Stefan Rotter, Alexey Yamilov, Hui Cao
Physics Faculty Research & Creative Works
The optical memory effect has emerged as a powerful tool for imaging through multiplescattering media; however, the finite angular range of the memory effect limits the field of view. Here, we demonstrate experimentally that selective coupling of incident light into a hightransmission channel increases the angular memoryeffect range. This enhancement is attributed to the robustness of the hightransmission channels against perturbations such as sample tilt or wave front tilt. Our work shows that the hightransmission channels provide an enhanced field of view for memoryeffectbased imaging through diffusive media.
Search For Eccentric Binary Black Hole Mergers With Advanced Ligo And Advanced Virgo During Their First And Second Observing Runs, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Search For Eccentric Binary Black Hole Mergers With Advanced Ligo And Advanced Virgo During Their First And Second Observing Runs, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
When formed through dynamical interactions, stellarmass binary black holes (BBHs) may retain eccentric orbits (e > 0.1 at 10 Hz) detectable by groundbased gravitationalwave detectors. Eccentricity can therefore be used to differentiate dynamically formed binaries from isolated BBH mergers. Current templatebased gravitationalwave searches do not use waveform models associated with eccentric orbits, rendering the search less efficient for eccentric binary systems. Here we present the results of a search for BBH mergers that inspiral in eccentric orbits using data from the first and second observing runs (O1 and O2) of Advanced LIGO and Advanced Virgo. We carried out the search ...
Probability Density Of The Fractional Langevin Equation With Reflecting Walls, Thomas Vojta, Sarah Skinner, Ralf Metzler
Probability Density Of The Fractional Langevin Equation With Reflecting Walls, Thomas Vojta, Sarah Skinner, Ralf Metzler
Physics Faculty Research & Creative Works
We investigate anomalous diffusion processes governed by the fractional Langevin equation and confined to a finite or semiinfinite interval by reflecting potential barriers. As the random and damping forces in the fractional Langevin equation fulfill the appropriate fluctuationdissipation relation, the probability density on a finite interval converges for long times towards the expected uniform distribution prescribed by thermal equilibrium. In contrast, on a semiinfinite interval with a reflecting wall at the origin, the probability density shows pronounced deviations from the Gaussian behavior observed for normal diffusion. If the correlations of the random force are persistent (positive), particles accumulate at the ...
Search For Intermediate Mass Black Hole Binaries In The First And Second Observing Runs Of The Advanced Ligo And Virgo Network, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Search For Intermediate Mass Black Hole Binaries In The First And Second Observing Runs Of The Advanced Ligo And Virgo Network, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
Gravitationalwave astronomy has been firmly established with the detection of gravitational waves from the merger of ten stellarmass binary black holes and a neutron star binary. This paper reports on the allsky search for gravitational waves from intermediate mass black hole binaries in the first and second observing runs of the Advanced LIGO and Virgo network. The search uses three independent algorithms: two based on matched filtering of the data with waveform templates of gravitationalwave signals from compact binaries, and a third, modelindependent algorithm that employs no signal model for the incoming signal. No intermediate mass black hole binary event ...
Directional Limits On Persistent Gravitational Waves Using Data From Advanced Ligo's First Two Observing Runs, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Directional Limits On Persistent Gravitational Waves Using Data From Advanced Ligo's First Two Observing Runs, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We perform an unmodeled search for persistent, directional gravitational wave (GW) sources using data from the first and second observing runs of Advanced LIGO. We do not find evidence for any GW signals. We place limits on the broadband GW flux emitted at 25 Hz from point sources with a power law spectrum at F_{α,Θ} < (0.0525) x 10^{−8} erg cm^{−2} s^{−1} Hz^{−1} and the (normalized) energy density spectrum in GWs at 25 Hz from extended sources at Ω_{α}(Θ) < (0.192.89) x 10^{−8} sr^{−1} where α is the spectral index of the energy density spectrum. These represent improvements ...
Gwtc1: A GravitationalWave Transient Catalog Of Compact Binary Mergers Observed By Ligo And Virgo During The First And Second Observing Runs, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Gwtc1: A GravitationalWave Transient Catalog Of Compact Binary Mergers Observed By Ligo And Virgo During The First And Second Observing Runs, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We present the results from three gravitationalwave searches for coalescing compact binaries with component masses above 1 Ma™ during the first and second observing runs of the advanced gravitationalwave detector network. During the first observing run (O1), from September 12, 2015 to January 19, 2016, gravitational waves from three binary black hole mergers were detected. The second observing run (O2), which ran from November 30, 2016 to August 25, 2017, saw the first detection of gravitational waves from a binary neutron star inspiral, in addition to the observation of gravitational waves from a total of seven binary black hole mergers ...
Search For The Isotropic Stochastic Background Using Data From Advanced Ligo's Second Observing Run, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Search For The Isotropic Stochastic Background Using Data From Advanced Ligo's Second Observing Run, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
The stochastic gravitationalwave background is a superposition of sources that are either too weak or too numerous to detect individually. In this study, we present the results from a crosscorrelation analysis on data from Advanced LIGO's second observing run (O2), which we combine with the results of the first observing run (O1). We do not find evidence for a stochastic background, so we place upper limits on the normalized energy density in gravitational waves at the 95% credible level of Ω_{GW} < 6.0 x 10^{8} for a frequencyindependent (flat) background and Ω_{GW} < 4.8 x 10^{8} at 25 Hz for a background of ...
A Dynamical (E,2e) Investigation Into The Ionization Of The Outermost Orbitals Of RCarvone, D. B. Jones, E. Ali, C. G. Ning, F. Ferreira Da Silva, O. Ingolfsson, M. C. A. Lopes, H. S. Chakraborty, Don H. Madison, M. J. Brunger
A Dynamical (E,2e) Investigation Into The Ionization Of The Outermost Orbitals Of RCarvone, D. B. Jones, E. Ali, C. G. Ning, F. Ferreira Da Silva, O. Ingolfsson, M. C. A. Lopes, H. S. Chakraborty, Don H. Madison, M. J. Brunger
Physics Faculty Research & Creative Works
We report an experimental and theoretical investigation into the dynamics of electronimpact ionization of Rcarvone. Experimental triple differential cross sections are obtained in asymmetric coplanar kinematic conditions for the ionization of the unresolved combination of the three outermost molecular orbitals (41a39a) of Rcarvone. These cross sections are compared with theoretical cross sections calculated within a molecular 3body distorted wave (M3DW) framework employing either a proper orientation average or orbital average to account for the random orientation of the molecule probed in the experiment. Here, we observe that the overall scattering behavior observed in the experiment is fairly well reproduced within ...
Erratum: Searches For Gravitational Waves From Known Pulsars At Two Harmonics In 20152017 Ligo Data (Astrophysical Journal (2019) 879 (10) Doi: 10.3847/15384357/Ab20cb), B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Erratum: Searches For Gravitational Waves From Known Pulsars At Two Harmonics In 20152017 Ligo Data (Astrophysical Journal (2019) 879 (10) Doi: 10.3847/15384357/Ab20cb), B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
Due to an error at the publisher, in the published article the number of pulsars presented in the paper is incorrect in multiple places throughout the text. Specifically, "222" pulsars should be "221." Additionally, the number of pulsars for which we have EM observations that fully overlap with O1 and O2 changes from "168" to "167." Elsewhere, in the machinereadable table of Table 1 and in Table 2, the row corresponding to pulsar J09520607 should be excised as well. Finally, in the caption for Table 2 the number of pulsars changes from "188" to "187." IOP Publishing sincerely regrets this ...
Unconventional Josephson Junctions With Topological Kondo Insulator Weak Links, Xuecheng Ye, Jacob Cook, Erik D. Huemiller, Aaron D. K. Finck, P. K. Ghaemi, Thomas Vojta, For Full List Of Authors, See Publisher's Website.
Unconventional Josephson Junctions With Topological Kondo Insulator Weak Links, Xuecheng Ye, Jacob Cook, Erik D. Huemiller, Aaron D. K. Finck, P. K. Ghaemi, Thomas Vojta, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
Proximityinduced superconductivity in threedimensional (3D) topological insulators forms a new quantum phase of matter and accommodates exotic quasiparticles such as Majorana bound states. One of the biggest drawbacks of the commonly studied 3D topological insulators is the presence of conducting bulk that obscures both surface states and low energy bound states. Introducing superconductivity in topological Kondo insulators such as SmB6, however, is promising due to their true insulating bulk at low temperatures. In this work, we develop an unconventional Josephson junction by coupling superconducting Nb leads to the surface states of a SmB6 crystal. We observe a robust critical current ...
Neutrino Splitting For LorentzViolating Neutrinos: Detailed Analysis, G. Somogyi, I. Nandori, Ulrich D. Jentschura
Neutrino Splitting For LorentzViolating Neutrinos: Detailed Analysis, G. Somogyi, I. Nandori, Ulrich D. Jentschura
Physics Faculty Research & Creative Works
Lorentzviolating neutrino parameters have been severely constrained on the basis of astrophysical considerations. In the highenergy limit, one generally assumes a superluminal dispersion relation of an incoming neutrino of the form E≈ p ⃗v , where E is the energy, p ⃗ is the momentum and v ₌ √(1+ δ) > 1. Leptonpair creation due to a Cerenkovradiationlike process (ν → ν + е^{}+e^{+}) becomes possible above a certain energy threshold, and bounds on the Lorentzviolating parameter δ can be derived. Here, we investigate a related process, ν_{i}→ ν_{i}+ ν_{f}+ ν ‾_{f}, where ν_{i} is an incoming neutrino mass eigenstate, while ...
Inverse Design Of LongRange Intensity Correlation In Scattering Media, M. Koirala, R. Sarma, H. Cao, Alexey Yamilov
Inverse Design Of LongRange Intensity Correlation In Scattering Media, M. Koirala, R. Sarma, H. Cao, Alexey Yamilov
Physics Faculty Research & Creative Works
We demonstrate a possibility of using geometry to deterministically control nonlocal correlation of waves undergoing mesoscopic transport through a disordered waveguide. In case of nondissipative medium, we find an explicit relationship between correlation and the shape of the system. Inverting this relationship, we realize inverse design: we obtain specific waveguide shape that leads to a predetermined nonlocal correlation. The proposed technique offers an approach to coherent control of wave propagation in random media that is complementary to wavefront shaping.
Radiative Transfer Distortions Of Lyman Α Emitters: A New FingersOfGod Damping In The Clustering In Redshift Space, Chris Byrohl, Shun Saito, Christoph Behrens
Radiative Transfer Distortions Of Lyman Α Emitters: A New FingersOfGod Damping In The Clustering In Redshift Space, Chris Byrohl, Shun Saito, Christoph Behrens
Physics Faculty Research & Creative Works
Complex radiative transfer (RT) of the Lyman α photons poses a theoretical challenge to galaxy surveys that infer the largescale structure with Lyman α emitters (LAEs). Guided by RT simulations, prior studies investigated the impact of RT on the largescale LAE clustering, and claimed that RT induces a selection effect which results in an anisotropic distortion even in real space but in an otherwise negligible effect in redshift space. However, our previous study, which relies on a full RT code run on the Illustris simulations, shows that the anisotropic selection effect was drastically reduced with higher spatial resolution. Adopting the ...
PseudoPeriodic Natural Higgs Inflation, I. G. Marian, N. Defenu, Ulrich D. Jentschura, A. Trombettoni, I. Nandori
PseudoPeriodic Natural Higgs Inflation, I. G. Marian, N. Defenu, Ulrich D. Jentschura, A. Trombettoni, I. Nandori
Physics Faculty Research & Creative Works
Inflationary cosmology represents a wellstudied framework to describe the expansion of space in the early universe, as it explains the origin of the largescale structure of the cosmos and the isotropy of the cosmic microwave background radiation. The recent detection of the Higgs boson renewed research activities based on the assumption that the inflaton could be identified with the Higgs field. At the same time, the question whether the inflationary potential can be extended to the electroweak scale and whether it should be necessarily chosen ad hoc in order to be physically acceptable are at the center of an intense ...
Multicenter DistortedWave Approach For ElectronImpact Ionization Of Molecules, Esam Ali, Don H. Madison
Multicenter DistortedWave Approach For ElectronImpact Ionization Of Molecules, Esam Ali, Don H. Madison
Physics Faculty Research & Creative Works
We have previously used the molecular threebody distortedwave model to examine electronimpact single ionization of molecules. One of the possible weaknesses of this approach lies in the fact that the continuum electron wave functions do not depend on the orientation of the molecule. Here we introduce a model called the multicenter molecular threebody distortedwave (MCM3DW) approach, for which the continuum electron wave functions depend on the orientation of the molecule at the time of ionization. The MCM3DW results are compared with experimental data taken from work by Dorn and colleagues [Ren, Phys. Rev. A 91, 032707 (2015)10.1103/PhysRevA ...
Imaging An Isolated Water Molecule Using A Single Electron Wave Packet, Xinyao Liu, Kasra Amini, Tobias Steinle, AnhThu Le, For Full List Of Authors, See Publisher's Website.
Imaging An Isolated Water Molecule Using A Single Electron Wave Packet, Xinyao Liu, Kasra Amini, Tobias Steinle, AnhThu Le, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
Observing changes in molecular structure requires atomicscale Ångstrom and femtosecond spatiotemporal resolution. We use the Fourier transform (FT) variant of laserinduced electron diffraction (LIED), FTLIED, to directly retrieve the molecular structure of H_{2}O^{+} with picometer and femtosecond resolution without a priori knowledge of the molecular structure nor the use of retrieval algorithms or ab initio calculations. We identify a symmetrically stretched H_{2}O^{+} fielddressed structure that is most likely in the ground electronic state. We subsequently study the nuclear response of an isolated water molecule to an external laser field at four different field strengths. We show ...
NarrowBand Search For Gravitational Waves From Known Pulsars Using The Second Ligo Observing Run, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
NarrowBand Search For Gravitational Waves From Known Pulsars Using The Second Ligo Observing Run, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
Isolated spinning neutron stars, asymmetric with respect to their rotation axis, are expected to be sources of continuous gravitational waves. The most sensitive searches for these sources are based on accurate matched filtering techniques that assume the continuous wave to be phase locked with the pulsar beamed emission. While matched filtering maximizes the search sensitivity, a significant signaltonoise ratio loss will happen in the case of a mismatch between the assumed and the true signal phase evolution. Narrowband algorithms allow for a small mismatch in the frequency and spindown values of the pulsar while coherently integrating the entire dataset. In ...
Impact Of Anharmonicity On The Vibrational Entropy And Specific Heat Of Uo₂, M. S. Bryan, J. W. L. Pang, B. C. Larson, Aleksandr V. Chernatynskiy, D. L. Abernathy, K. Gofryk, M. E. Manley, For Full List Of Authors, See Publisher's Website.
Impact Of Anharmonicity On The Vibrational Entropy And Specific Heat Of Uo₂, M. S. Bryan, J. W. L. Pang, B. C. Larson, Aleksandr V. Chernatynskiy, D. L. Abernathy, K. Gofryk, M. E. Manley, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
The impact of anharmonicity on the vibrational entropy and heat capacity of UO2 has been investigated from 10 to 1200 K using inelastic neutronscattering measurements of the phonon density of states (PDOS). Small changes in the PDOS are observed from 10 to 295 K, with more noticeable changes appearing in the 750 and 1200K data. The specific heat determined from the PDOS measurements is in agreement with macroscopic specific heat measurements, and the overall impact of nondilation anharmonicity on the specific heat has been shown to be less than 2%. An analysis of the phonon measurements shows that the softening ...
FewBody Dynamics Underlying Postcollision Effects In The Ionization Of H₂ By 75Kev Proton Impact, M. Dhital, S. Bastola, A. Silvus, Don H. Madison, Michael Schulz
FewBody Dynamics Underlying Postcollision Effects In The Ionization Of H₂ By 75Kev Proton Impact, M. Dhital, S. Bastola, A. Silvus, Don H. Madison, Michael Schulz
Physics Faculty Research & Creative Works
We have measured fully differential cross sections (FDCS) for ionization in 75keVp+H2 collisions for ejected electron speeds close to the projectile speed. The data were analyzed in dependence on both the electron emission angle and the projectile scattering angle. Pronounced postcollisional effects between the projectile and the ejected electrons were observed. Significant differences between experiment and theory and between two conceptually very similar theoretical models were found. This shows that in the region of electronprojectile velocitymatching the FDCS is very sensitive to the details of the underlying fewbody dynamics.
Searches For Gravitational Waves From Known Pulsars At Two Harmonics In 20152017 Ligo Data, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Searches For Gravitational Waves From Known Pulsars At Two Harmonics In 20152017 Ligo Data, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We present a search for gravitational waves from 221 pulsars with rotation frequencies ≳ 10 Hz. We use advanced LIGO data from its first and second observing runs spanning 20152017, which provides the highestsensitivity gravitationalwave data so far obtained. In this search we target emission from both the l = m = 2 mass quadrupole mode, with a frequency at twice that of the pulsar's rotation, and the l = 2, m = 1 mode, with a frequency at the pulsar rotation frequency. The search finds no evidence for gravitationalwave emission from any pulsar at either frequency. For the l = m = 2 mode search ...
Tests Of General Relativity With Gw170817, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Tests Of General Relativity With Gw170817, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
The recent discovery by Advanced LIGO and Advanced Virgo of a gravitational wave signal from a binary neutron star inspiral has enabled tests of general relativity (GR) with this new type of source. This source, for the first time, permits tests of strongfield dynamics of compact binaries in the presence of matter. In this Letter, we place constraints on the dipole radiation and possible deviations from GR in the postNewtonian coefficients that govern the inspiral regime. Bounds on modified dispersion of gravitational waves are obtained; in combination with information from the observed electromagnetic counterpart we can also constrain effects due ...
Triple Differential Cross Sections For ElectronImpact Ionization Of Methane At Intermediate Energy, Esam Ali, Carlos Granados, Ahmad Sakaamini, Don H. Madison
Triple Differential Cross Sections For ElectronImpact Ionization Of Methane At Intermediate Energy, Esam Ali, Carlos Granados, Ahmad Sakaamini, Don H. Madison
Physics Faculty Research & Creative Works
We report an experimental and theoretical investigation of electronimpact single ionization of the highest occupied molecular orbital 1t_{2} and the next highest occupied molecular orbital 2a_{1} states of CH_{4} at an incident electron energy of 250 eV. Triple differential cross sections measured in two different laboratories were compared with results calculated within the molecular 3body distorted wave and generalized Sturmian function theoretical models. For ionization of the 1t_{2} state, the binary peak was observed to have a single maximum near the momentum transfer direction that evolved into a double peak for increasing projectile scattering angles, as ...
AllSky Search For LongDuration GravitationalWave Transients In The Second Advanced Ligo Observing Run, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
AllSky Search For LongDuration GravitationalWave Transients In The Second Advanced Ligo Observing Run, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We present the results of a search for longduration gravitationalwave transients in the data from the Advanced LIGO second observation run; we search for gravitationalwave transients of 2500 s duration in the 242048 Hz frequency band with minimal assumptions about signal properties such as waveform morphologies, polarization, sky location or time of occurrence. Signal families covered by these search algorithms include fallback accretion onto neutron stars, broadband chirps from innermost stable circular orbit waves around rotating black holes, eccentric inspiralmergerringdown compact binary coalescence waveforms, and other models. The second observation run totals about 118.3 days of coincident data between ...