A5061212474- Nuclear physics research studies
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Atomic and Molecular Physics
- Radioactive Decay and Measurement Techniques
- Muon and positron interactions and applications
- Stellar, planetary, and galactic studies
- Particle accelerators and beam dynamics
- Advanced NMR Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Radiation Detection and Scintillator Technologies
- Quantum and electron transport phenomena
- Galaxies: Formation, Evolution, Phenomena
- Flow Measurement and Analysis
- nanoparticles nucleation surface interactions
- Ion-surface interactions and analysis
- Advanced Optical Sensing Technologies
- Dark Matter and Cosmic Phenomena
- Photocathodes and Microchannel Plates
- Seismic Imaging and Inversion Techniques
- Radioactive contamination and transfer
Argonne National Laboratory
2019-2025
University of Notre Dame
2017-2024
SUNY Brockport
2018
Joint Institute for Nuclear Astrophysics
2018
The rare phenomenon of nuclear wobbling motion has been investigated in the nucleus ^{187}Au. A longitudinal wobbling-bands pair identified and clearly distinguished from associated signature-partner band on basis angular distribution measurements. Theoretical calculations framework particle rotor model are found to agree well with experimental observations. This is first evidence for bands where expected signature partner also identified, establishes this exotic collective mode as a general...
The electroweak interaction in the standard model is described by a pure vector-axial-vector structure, though any Lorentz-invariant component could contribute. In this Letter, we present most precise measurement of tensor currents low-energy regime examining β-ν[over ¯] correlation trapped ^{8}Li ions with Beta-decay Paul Trap. We find a_{βν}=-0.3325±0.0013_{stat}±0.0019_{syst} at 1σ for case coupling to right-handed neutrinos (C_{T}=-C_{T}^{'}), which consistent prediction.
A nuclear mass survey of rare-earth isotopes has been conducted with the Canadian Penning Trap spectrometer using most neutron-rich nuclei thus far extracted from CARIBU facility. We present a collection 12 masses determined precision $\ensuremath{\le}10$ keV/$c{}^{2}$ for $Z=58--63$ near $N=100$. Independently, detailed study exploring role in formation $r$-process abundance peak performed. Employing Markov chain Monte Carlo (MCMC) technique, predictions lanthanide have made which uniquely...
A precision measurement of the β^{+} decay ^{8}B was performed using Beta-decay Paul Trap to determine β-ν angular correlation coefficient a_{βν}. The experimental results were combined with new ab initio symmetry-adapted no-core shell-model calculations yield second-most precise from Gamow-Teller decays, a_{βν}=-0.3345±0.0019_{stat}±0.0021_{syst}. This value agrees standard model -1/3 and improves uncertainties in by nearly a factor 2. By combining ^{8}Li, tight limit on tensor current...
The ${\ensuremath{\beta}}^{+}$ decay of $^{8}\mathrm{B}$ provides the dominant source solar neutrinos above 2 MeV. Consequently, experiments that detect from sun require an accurate determination neutrino energy spectrum. In this work, $\ensuremath{\beta}$-decay Paul trap surrounded by double-sided silicon strip detectors was utilized to precisely measure products trapped ions. results were used determine $^{8}\mathrm{Be}$ final-state distribution and reconstruct This measurement using ions...
Background: The precise determination of the $\mathcal{F}t$ value in $T=1/2$ mixed mirror decays is an important avenue for testing standard model electroweak interaction through ${V}_{ud}$ nuclear $\ensuremath{\beta}$ decays. $^{11}\mathrm{C}$ interesting case, as its low mass and small ${Q}_{EC}$ make it particularly sensitive to violations conserved vector current hypothesis. present dominant source uncertainty $^{11}\mathrm{C}\phantom{\rule{4pt}{0ex}}\mathcal{F}t$ half-life.Purpose: A...
If the mass excess of neutron-deficient nuclei and their neutron-rich mirror partners are both known, it can be shown that deviations Isobaric Mass Multiplet Equation (IMME) in form a cubic term probed. Such was probed by using atomic magnesium isotopes measured TITAN Penning trap recently proton-separation energies $^{29}$Cl $^{30}$Ar. The $^{27}$Mg found to within 1.6$\sigma$ value stated Atomic Evaluation. masses $^{28,29}$Mg were 1$\sigma$, while being 8 34 times more precise,...
A new precision half-life measurement of $^{13}\mathrm{N}$ has been conducted using the TwinSol $\ensuremath{\beta}$-counting station at University Notre Dame. The measured value ${t}_{1/2}^{\mathrm{new}}=597.05(19)\phantom{\rule{4pt}{0ex}}\mathrm{s}$ differs from previous world by about $2.8\ensuremath{\sigma}$. An evaluation results in a ${t}_{1/2}^{\mathrm{world}}=597.19(22)\phantom{\rule{4pt}{0ex}}\mathrm{s}$. Updated standard model predictions for Fermi to Gamow-Teller mixing ratio...
We present the first measurement of α-β-ν angular correlation in Gamow-Teller β^{+} decay ^{8}B. This was accomplished using Beta-decay Paul Trap, expanding on our previous work β^{-} ^{8}Li. The ^{8}B result is consistent with V-A electroweak interaction standard model and, its own, provides a limit exotic right-handed tensor current relative to axial-vector |C_{T}/C_{A}|^{2}<0.013 at 95.5% confidence level. represents high-precision measurements mirror decays and made possible through use...
Nuclear isomer effects are pivotal in understanding nuclear astrophysics, particularly the rapid neutron-capture process where population of metastable isomers can alter radioactive decay paths nuclei produced during astrophysical events. The $\ensuremath{\beta}$-decaying $^{128\mathrm{m}}\mathrm{Sb}$ was identified as potentially impactful since $\ensuremath{\beta}$-decay pathway along $A=128$ isobar funnels into this state bypassing ground state. We report first direct mass measurements...
Atomic masses are a foundational quantity in our understanding of nuclear structure, astrophysics and fundamental symmetries. The long-standing goal creating predictive global model for the binding energy nucleus remains significant challenge, however, prompts need precise measurements atomic to serve as anchor points developments. We present mass neutron-rich Ru Pd isotopes performed at Californium Rare Isotope Breeder Upgrade facility Argonne National Laboratory using Canadian Penning Trap...
A new precision half-life measurement of $^{25}\mathrm{Al}$ was conducted using the TwinSol $\ensuremath{\beta}$-counting station at University Notre Dame. The measured value ${t}_{1/2}^{\mathrm{new}}=7.1657(24)$ s is in good agreement with most recent measurement, while being 3 times more precise. Using these measurements, an evaluation has been performed, leading to average ${t}_{1/2}^{\mathrm{world}}=7.1665(26)$ s, which 5 precise than it's predecessor and a satisfactory Birge ratio 1.1....
A new precision half-life measurement of $^{29}\mathrm{P}$ was conducted using the TwinSol $\ensuremath{\beta}$-counting station at University Notre Dame Nuclear Science Laboratory. The resulting value ${t}_{1/2}^{\mathrm{new}}=4.1055(44)\phantom{\rule{0.28em}{0ex}}\mathrm{s}$ is most precise to date. Utilizing this and reevaluating world data leads a average ${t}_{1/2}^{\mathrm{world}}=4.1031(58)\phantom{\rule{0.28em}{0ex}}\mathrm{s}$, which improves Birge ratio from 3.11 1.45 2.3 times...
The half-life of $^{15}\mathrm{O}$ was measured using the $\ensuremath{\beta}$-Counting Station at University Notre Dame's Nuclear Science Laboratory. Our new result, ${t}_{1/2}=122.308(49)$ s, is most precise determination to date for $^{15}\mathrm{O}$, and improves world average by a factor 4, yielding ${t}_{1/2}^{\text{world}}=122.27(6)$ s. This more value will be important future determinations ${V}_{\text{ud}}$ superallowed $T=1/2$ mirror transitions.
We report a new precision half-life measurement of $^{20}\mathrm{F}$, performed using the $\ensuremath{\beta}$-counting station University Notre Dame's Nuclear Science Laboratory. The measured $11.0160{(41)}_{\text{stat}}{(155)}_{\text{sys}}$ s resulting from this work will help resolve longstanding discrepancy between two earlier sets high-precision measurements.