A5077862347- Radioactive element chemistry and processing
- Chemical Synthesis and Characterization
- Nuclear Physics and Applications
- Nuclear Materials and Properties
- Nuclear physics research studies
- Radiopharmaceutical Chemistry and Applications
- Advanced NMR Techniques and Applications
- Radioactive contamination and transfer
- Planetary Science and Exploration
- Nuclear reactor physics and engineering
- Lanthanide and Transition Metal Complexes
- Diatoms and Algae Research
- Electrophoretic Deposition in Materials Science
- NMR spectroscopy and applications
- Iron oxide chemistry and applications
- Particle accelerators and beam dynamics
- Particle physics theoretical and experimental studies
- Nuclear materials and radiation effects
- Fusion materials and technologies
- Advanced MRI Techniques and Applications
- Analytical chemistry methods development
- Isotope Analysis in Ecology
- Neutrino Physics Research
- Astro and Planetary Science
- Titanium Alloys Microstructure and Properties
Lawrence Livermore National Laboratory
2016-2025
Hunter College
2018-2024
City University of New York
2018-2023
The Graduate Center, CUNY
2020-2023
Lawrence Livermore National Security
2017
University of California, Berkeley
2014-2016
Berkeley College
2014-2016
Lawrence Berkeley National Laboratory
2015
University of California System
2014
Tufts University
2010
Chemical analyses of three Martian soil samples were performed using the Wet Chemistry Laboratories on 2007 Phoenix Mars Scout Lander. One sample was obtained from top ∼2 cm (Rosy Red) and two at ∼5 depth ice table interface (Sorceress 1 Sorceress 2). When mixed with water in a ∼1:25 to solution ratio (by volume), portion components solvated. Ion concentrations measured an array ion selective electrodes conductivity cell. The represent minimum leachable ions do not take into account species...
Sulfur has been detected by X‐ray spectroscopy in martian soils at the Viking, Pathfinder, Opportunity and Spirit landing sites. Sulfates have identified OMEGA CRISM Valles Marineris spectrometers on MER rovers Meridiani Gusev. The ubiquitous presence of sulfur interpreted as a widely distributed sulfate mineralogy. One goal Wet Chemistry Laboratory (WCL) NASA's Phoenix Mars Lander was to determine soluble soil. We report here first in‐situ measurement equivalent ∼1.3(±0.5) wt% SO 4 results...
Forty-six decay chains, assigned to the of 288115, were produced using 243Am(48Ca,3n)288115 reaction at Lawrence Berkeley National Laboratory 88-in. cyclotron. The resulting series α decays studied α-photon and α-x-ray spectroscopies. Multiple coincidences observed in element 115 chain members, particularly third- fourth-generation (presumed be 280Rg 276Mt, respectively). Upon combining these data with those from 22 288115 chains a similar experiment, updated level schemes 276Mt 272Bh...
Sequestration of trivalent actinides and lanthanides present in used nuclear fuel legacy wastes is necessary for appropriate long-term stewardship these metals, particularly to prevent their release into the environment. Organically modified mesoporous silica an efficient material recovery potential subsequent separation because its high surface area, tunable ligand selection, chemically robust substrate. We have synthesized first novel hybrid composed SBA-15 type functionalized with...
The Facility for Rare Isotope Beams (FRIB) at Michigan State University provides a unique opportunity to access some of the nation's most specialized scientific resources: radioisotopes. An excess useful radioisotopes will be formed as FRIB fulfills its basic science mission providing rare isotope beams. In order beams reach high-purity, many isotopes are discarded and go unused. If harvested, unused could enable cutting-edge research diverse applications ranging from medical therapy...
Several past experiments such as SAGE, GALLEX, and BEST reported lower than expected neutrino capture rates on ${}^{71}$Ga. The origin of this so-called ``gallium anomaly'' could potentially indicate new physics, unless there was a more mundane explanation. Because the measured half-life electron-capture decay ${}^{71}$Ge can be used to calculate neutrino-capture cross section ${}^{71}$Ga, authors carried out three separate measurements determine with high precision. Their result...
Investigating the extraction and separation behavior of americium curium using synergic dual-ligand solvent systems their conversion to novel chromatographic resins.
An experiment was performed at the National Superconducting Cyclotron Laboratory using a 140 MeV/nucleon 48Ca beam and flowing-water target to produce 47Ca for first time with this production route. A rate of 0.020 ± 0.004 nuclei per incoming particle measured. isotope harvesting system attached used collect radioactive cationic products, including 47Ca, from water on cation-exchange resin. The collected purified three separation methods optimized work: (1) DGA extraction chromatography...
Isotope harvesting is a method of collecting the long-lived radioisotopes that build up during operation ion-beam facilities in way useful for subsequent research. As demonstration this collection group IV metal at fragmentation facility, high-energy $^{88}\mathrm{Zr}$ secondary beam produced from 140-MeV/u $^{92}\mathrm{Mo}$ primary National Superconducting Cyclotron Laboratory (NSCL) was stopped water target. The setup aimed to mimic aqueous dump will be implemented Facility Rare Beams...
Functionalized mesoporous silica has applications in separations science, catalysis, and sensors. In this work, we studied the fundamental interactions of trivalent cations with functionalized silica. We contacted varying ionic radii N-[5-(trimethoxysilyl)-2-aza-1-oxopentyl]caprolactam aim probing binding mechanism metal to surface solid. using solid-state nuclear magnetic resonance (NMR) spectroscopy before after contact metals interest. collected NMR spectra various metals, as well (29)Si...
Solid-state NMR is used to connect the molecular structure of acetamide phosphonate-functionalized mesoporous silica with its macroscopic U(<sc>vi</sc>) extraction properties.
Solid-state NMR techniques combined with batch contact experiments elucidate how U(<sc>vi</sc>) binds to phosphonate-functionalized mesoporous silica.
Tensor-rank decomposition methods have been applied to variable contact time <sup>29</sup>Si{<sup>1</sup>H} CP/CPMG NMR data sets extract dynamics information and dramatically decrease conventional acquisition times.
Pu is separated from excess U and isotopically assayed using our novel microfluidic platform designed to miniaturize traditional laboratory techniques into a field-deployable system for rapid nuclear forensics in post-detonation scenarios.
Recent discussions about the origin of Gallium Anomaly have motivated a remeasurement half life $^{71}$Ge. We conducted three separate measurements using dedicated planar Ge detectors: one with $^{55}$Fe as standard, $^{57}$Co and stand alone 71Ge measurement. Our results yield 11.468 +- 0.008 days, which is consistent but significantly more precise than currently accepted value. With this experiment, potential explanation being due to an unexpectedly long $^{71}$Ge has been ruled out,...
Stable, monodisperse sub-micron cerium particle suspensions were synthesized from a Ce IV precursor by homogeneous precipitation with hexamethylenetetramine and ammonium hydroxide.