Publications (53)
Field-free orientation of CO molecules by femtosecond two-color laser fields
S. De, I. Znakovskaya, D. Ray +8
We report the first experimental observation of non-adiabatic field-free orientation of a heteronuclear diatomic molecule (CO) induced by an intense two-color (800 and 400 nm) femt…
Casimir Effect in Active Matter Systems
D. Ray, C. Reichhardt, C. J. Olson Reichhardt
We numerically examine run-and-tumble active matter particles in Casimir geometries composed of two finite parallel walls. We find that there is an attractive force between the two…
First direct measurement of Ca single -decay Q value with the TITAN Penning trap
S. Kakkar, D. Perera, J. Ash +19
Neutrinoless double -decay (0), if observed, would provide unequivocal evidence of physics beyond the Standard Model. Ca is an interesting candidate system to st…
Precise Mass Measurements of Isobars with the Canadian Penning Trap: Resolving the $Q_{β^-}$ anomaly at Te
A. A. Valverde, F. G. Kondev, B. Liu +11
We report precision mass measurements of Sb, Te, and I, produced at CARIBU at Argonne National Laboratory's ATLAS facility and measured using the Cana…
Scalar meson field in a conformally flat space
Abhik Kumar Sanyal, D. Ray
Among several authors, who studied massive and massless scalar meson fields in general relativity, attempts to obtain a complete set of solutions for a conformally flat metric $e^Ï…
Pinning, Ordering, and Dynamics of Vortices in Conformal Crystal and Gradient Pinning Arrays
D. Ray, C. Reichhardt, C. J. Olson Reichhardt
We numerically investigate magnetization, pinning, ordering, and dynamics of vortices interacting with pinning arrangements which have a density gradient. We focus on conformal cry…
Investigating the effects of precise mass measurements of Ru and Pd isotopes on machine learning mass modeling
W. S. Porter, B. Liu, D. Ray +19
Atomic masses are a foundational quantity in our understanding of nuclear structure, astrophysics and fundamental symmetries. The long-standing goal of creating a predictive global…
Supernova electron-neutrino interactions with xenon in the nEXO detector
nEXO Collaboration, S. Hedges, S. Al Kharusi +144
Electron-neutrino charged-current interactions with xenon nuclei were modeled in the nEXO neutrinoless double- decay detector (~5 metric ton, 90% Xe, 10% Xe…
Design of a high voltage delivery system for noble liquid time projection chambers
R. Saldanha, L. Pagani, E. Angelico +129
Noble liquid time projection chambers (TPCs) are a leading technology in the detection of ionizing radiation, particularly in applications such as accelerator neutrino physics, dar…
Precise Mass Measurement of the Longest Odd-Odd Chain of \boldmath Ground States
B. Liu, M. Brodeur, J. A. Clark +14
Precise mass measurements of the ground and isomeric states of the odd-odd Rh were performed using the Canadian Penning Trap at Argonne National Laborat…
Characterization of CRYO ASIC for charge readout in the nEXO experiment
Z. Li, M. Yu, E. Angelico +141
nEXO is a proposed next-generation experiment searching for the neutrinoless double beta decay of Xe using a tonne-scale liquid xenon (LXe) time projection chamber (TPC). T…
Astrophysical significance of the isomer Ag demonstrated through direct mass measurement
F. Rivero, M. Brodeur, J. A. Clark +18
The abundance of elements heavier than iron produced via the astrophysical rapid-neutron capture process depends sensitively on the atomic mass of the involved nuclei as well as th…
Comparing the Dynamics of Skyrmions and Superconducting Vortices
C. J. Olson Reichhardt, S. Z. Lin, D. Ray +1
Vortices in type-II superconductors have attracted enormous attention as ideal systems in which to study nonequilibrium collective phenomena, since the self-ordering of the vortice…
Ultra-pure Nickel for Structural Components of Low-Radioactivity Instruments
T. J. Roosendaal, C. T. Overman, G. S. Ortega +123
The next generation of rare-event search experiments in nuclear and particle physics demand structural materials combining exceptional mechanical strength with ultra-low levels of…
Mass measurements of Yb identify an anomalous proton-neutron interaction
C. L. Brown, J. Ash, B. Ashrafkhani +30
Mass measurements of nuclei can identify structurally-driven trends in binding energy across isotopic chains, and can also isolate specific nucleon-nucleon interactions, such as th…
Imaging of single barium atoms in a second matrix site in solid xenon for barium tagging in a Xe double beta decay experiment
M. Yvaine, D. Fairbank, J. Soderstrom +134
Neutrinoless double beta decay is one of the most sensitive probes for new physics beyond the Standard Model of particle physics. One of the isotopes under investigation is $^{136}…
Magnus-Induced Ratchet Effects for Skyrmions Interacting with Asymmetric Substrates
C. Reichhardt, D. Ray, C. J. Olson Reichhardt
When a particle is driven with an ac force over an asymmetric potential, it can undergo a ratchet effect that produces a net dc motion of the particle. Ratchet effects have been ob…
Global performance of covariant energy density functionals: ground state observables of even-even nuclei and the estimate of theoretical uncertainties
S. E. Agbemava, A. V. Afanasjev, D. Ray +1
Covariant density functional theory (CDFT) is a modern theoretical tool for the description of nuclear structure phenomena. The current investigation aims at the global assessment…
Exploration for Astromers near Sn with the Canadian Penning Trap
A. A. Valverde, S. Cupp, A. Gross +26
Nuclear isomers can have significant impacts on astrophysical nucleosynthesis processes, with recent efforts demonstrating that the population of isomeric states with different hal…
Precise Mass Measurement of the La-Ce-Pr isobaric chain
B. Liu, M. Brodeur, J. A. Clark +13
Penning trap mass measurements of La, Ce, and Pr were performed with the Canadian Penning Trap (CPT) at the CARIBU facility of Argonne National Laboratory u…
Experimental updates on development of accelerator-driven ion source at TRIUMF to benchmark Ba-tagging techniques for future neutrinoless double beta decay searches
D. Ray, M. Marquis, A. V. Balbuena +4
Neutrinoless double beta decay () could provide a way to probe physics beyond the Standard Model of particle physics. The proposed nEXO experiment aims to search for $0ν΅
'Searching for a needle in a haystack;' A Ba-tagging approach for an upgraded nEXO experiment
H. Rasiwala, K. Murray, Y. Lan +17
nEXO is a proposed experiment that will search for neutrinoless double-beta decay (0) in 5-tonnes of liquid xenon (LXe), isotopically enriched in Xe. A technique ca…
Improved Limit on Tensor Currents in the Weak Interaction from Li Decay
M. T. Burkey, G. Savard, A. T. Gallant +28
The electroweak interaction in the Standard Model (SM) is described by a pure vector-axial-vector structure, though any Lorentz-invariant component could contribute. In this work,…
Assessing theoretical uncertainties in fission barriers of superheavy nuclei
S. E. Agbemava, A. V. Afanasjev, D. Ray +1
Theoretical uncertainties in the predictions of inner fission barrier heights in superheavy elements have been investigated in a systematic way for a set of state-of-the-art covari…
Self-Similar Magnetohydrodynamics
Abhik Kumar Sanyal, D. Ray
For the solution of the full set of magnetohydrodynamics (MHD) equations in the presence of gravity due to a central point-mass, a self-similar theory for a general polytrope has a…
Vortex Transport and Pinning Effectiveness in Conformal Pinning Arrays
D. Ray, C. Reichhardt, C. J. Olson Reichhardt +1
We examine the current driven dynamics for vortices interacting with conformal crystal pinning arrays and compare to the dynamics of vortices driven over random pinning arrays. We…
The nEXO Radioassay Program
R. MacLellan, P. Acharya, B. Aharmim +148
Material radioactivity compilations, such as the one presented here, are important enablers of science. They are useful for the selection of radiopure materials used in the design…
Ultrafast x-ray-induced nuclear dynamics in diatomic molecules using femtosecond x-ray/x-ray pump-probe spectroscopy
C. S. Lehmann, A. Picón, C. Bostedt +22
The capability of generating two intense, femtosecond x-ray pulses with controlled time delay opens the possibility of performing time-resolved experiments for x-ray induced phenom…
Nuclear landscape in covariant density functional theory
A. V. Afanasjev, S. E. Abgemava, D. Ray +1
The neutron and proton drip lines represent the limits of the nuclear landscape. While the proton drip line is measured experimentally up to rather high -values, the location of…
The Beta-decay Paul Trap Mk IV: Design and commissioning
L. Varriano, G. Savard, J. A. Clark +29
The Beta-decay Paul Trap is an open-geometry, linear trap used to measure the decays of Li and B to search for a tensor contribution to the weak interaction. In the latest…
Vortex States in Archimedean Tiling Pinning Arrays
D. Ray, C. Reichhardt, C. J. Olson Reichhardt
We numerically study vortex ordering and pinning in Archimedean tiling substrates composed of square and triangular plaquettes. The two different plaquettes become occupied at diff…
Recent progress in the studies of neutron rich and high- systems within the covariant density functional theory
A. V. Afanasjev, S. E. Agbemava, D. Ray +1
The analysis of statistical and systematic uncertainties and their propogation to nuclear extremes has been performed. Two extremes of nuclear landscape (neutron-rich nuclei and su…
The neutron drip line: single-particle degrees of freedom and pairing properties as sources of theoretical uncertainties
A. V. Afanasjev, S. E. Agbemava, D. Ray +1
The sources of theoretical uncertainties in the prediction of the two-neutron drip line are analyzed in the framework of covariant density functional theory. We concentrate on sing…
Pinning, Flux Diodes, and Ratchets for Vortices Interacting with Conformal Pinning Arrays
C. J. Olson Reichhardt, Y. L. Wang, Z. L. Xiao +4
A conformal pinning array can be created by conformally transforming a uniform triangular pinning lattice to produces a new structure in which the six-fold ordering of the original…
An integrated online radioassay data storage and analytics tool for nEXO
R. H. M. Tsang, A. Piepke, S. Al Kharusi +157
Large-scale low-background detectors are increasingly used in rare-event searches as experimental collaborations push for enhanced sensitivity. However, building such detectors, in…
Few-femtosecond resolved imaging of laser-driven nanoplasma expansion
C. Peltz, J. A. Powell, P. Rupp +23
The free expansion of a planar plasma surface is a fundamental non-equilibrium process relevant for various fields but as-yet experimentally still difficult to capture. The signifi…
Nonequilibrium Phases and Segregation for Skyrmions on Periodic Pinning Arrays
C. Reichhardt, D. Ray, C. J. O. Reichhardt
Using particle-based simulations, we examine the collective dynamics of skyrmions interacting with periodic pinning arrays, focusing on the impact of the Magnus force on the slidin…
Precision Mass Measurements of \textsuperscript{130}Te, \textsuperscript{130}Sn, and Their Impact on Models for R-Process Nucleosynthesis
A. Cannon, W. S. Porter, A. A. Valverde +12
The astrophysical rapid neutron capture nucleosynthesis process (r-process) remains an active area of research due to the fact that it occurs in extreme conditions and involves rea…
Sensitivity of nEXO to Xe Charged-Current Interactions: Background-free Searches for Solar Neutrinos and Fermionic Dark Matter
G. Richardson, B. G. Lenardo, D. Gallacher +135
We study the sensitivity of nEXO to solar neutrino charged-current interactions, XeCs, as well as analogous interactions predicted by m…
Rotational excitations in near neutron-drip line nuclei: the birth and death of particle-bound rotational bands and the extension of nuclear landscape beyond spin zero neutron drip line
A. V. Afanasjev, N. Itagaki, D. Ray
Two new mechanisms active in rotating nuclei located in the vicinity of neutron drip line have been discovered. Strong Coriolis interaction acting on high- orbitals transforms p…
Mass measurements of neutron-rich nuclides using the Canadian Penning Trap to inform predictions in the -process rare-earth peak region
D. Ray, N. Vassh, B. Liu +25
Studies aiming to determine the astrophysical origins of nuclei produced by the rapid neutron capture process ( process) rely on nuclear properties as inputs for simulations. Th…
Viscoelastic flow past an infinite plate with suction and constant heat flux
Abhik Kumar Sanyal, D. Ray
While studying the viscoelastic flow past an infinite plate with suction and constant heat flux between fluid and plate, Raptis and Tziyanidis gave the solution of a pair of equati…
Strongly Enhanced Vortex Pinning by Conformal Crystal Arrays
D. Ray, C. J. Olson Reichhardt, B. Janko +1
Conformal crystals are non-uniform structures created by a conformal transformation of regular two-dimensional lattices. We show that gradient-driven vortices interacting with a co…
Collective Transport Properties of Driven Skyrmions with Random Disorder
C. Reichhardt, D. Ray, C. J. Olson Reichhardt
We use particle-based simulations to examine the static and driven collective phases of skyrmions interacting with random quenched disorder. We show that non-dissipative effects du…
Nuclear energy density functionals: what we can learn about/from their global performance?
A. V. Afanasjev, S. E. Agbemava, D. Ray +1
A short review of recent results on the global performance of covariant energy density functionals is presented. It is focused on the analysis of the accuracy of the description of…
Quantized Transport for a Skyrmion Moving on a Two-Dimensional Periodic Substrate
C. Reichhardt, D. Ray, C. J. Olson Reichhardt
We study the dynamics and velocity-force curves of a skyrmion moving over a two-dimensional periodic substrate using simulations of a particle-based skyrmion model, focusing on the…
The possibility of C cluster as a building block of medium mass nuclei
N. Itagaki, A. V. Afanasjev, D. Ray
The possibility of the C cluster being a basic building block of medium mass nuclei is discussed. Although cluster structures have been widely discussed in the light $N…
From superdeformation to extreme deformation and clusterization in the N~Z nuclei of the A~40 mass region
D. Ray, A. V. Afanasjev
A systematic search for extremely deformed structures in the N~Z nuclei of the A~40 mass region has been performed for the first time in the framework of covariant density function…
Emitter-site selective photoelectron circular dichroism of trifluoromethyloxirane
M. Ilchen, G. Hartmann, P. Rupprecht +13
The angle-resolved inner-shell photoionization of R-trifluoromethyloxirane, C3H3F3O, is studied experimentally and theoretically. Thereby, we investigate the photoelectron circular…
Phase-Imaging Ion-Cyclotron-Resonance Mass Spectrometry with the Canadian Penning Trap at CARIBU
D. Ray, A. A. Valverde, M. Brodeur +9
The Canadian Penning Trap mass spectrometer (CPT) has conducted precision mass measurements of neutron-rich nuclides from the CAlifornium Rare Isotope Breeder Upgrade (CARIBU) of t…
High spin structures in the mass region: from superdeformation to extreme deformation and clusterization (an example of Si)
A. V. Afanasjev, D. Ray
The search for extremely deformed structures in the yrast and near-yrast region of Si has been performed within the cranked relativistic mean field theory up to spin $I=20\h…
Ultra-sensitive radon assay using an electrostatic chamber in a recirculating system
nEXO Collaboration, A. Anker, P. A. Breur +138
Rare event searches such as neutrinoless double beta decay and Weakly Interacting Massive Particle detection require ultra-low background detectors. Radon contamination is a signif…
Reversible Ratchet Effects for Vortices in Conformal Pinning Arrays
C. Reichhardt, D. Ray, C. J. Olson Reichhardt
A conformal transformation of a uniform triangular pinning array produces a structure called a conformal crystal which preserves the six-fold ordering of the original lattice but c…