A5027080386- Nuclear physics research studies
- Nuclear Physics and Applications
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Nuclear reactor physics and engineering
- Astronomical and nuclear sciences
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Particle Detector Development and Performance
- Medical Imaging Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Atomic and Molecular Physics
- Advanced NMR Techniques and Applications
- Astro and Planetary Science
- Quantum, superfluid, helium dynamics
- Dark Matter and Cosmic Phenomena
- Complex Network Analysis Techniques
- Opinion Dynamics and Social Influence
- Particle accelerators and beam dynamics
- Inorganic Fluorides and Related Compounds
- Photocathodes and Microchannel Plates
- Radiation Therapy and Dosimetry
- Gamma-ray bursts and supernovae
- Radiopharmaceutical Chemistry and Applications
Louisiana State University
2014-2024
University of Notre Dame
2017-2022
Joint Institute for Nuclear Astrophysics
2019-2022
Texas A&M University
2020
Florida State University
2017
Louisiana State University Agricultural Center
2016
University of North Carolina at Chapel Hill
2010-2011
Network science is an interdisciplinary endeavor, with methods and applications drawn from across the natural, social, information sciences. A prominent problem in network algorithmic detection of tightly-connected groups nodes known as communities. We developed a generalized framework quality functions that allowed us to study community structure arbitrary multislice networks, which are combinations individual networks coupled through links connect each node one slice itself other slices....
Carbon and oxygen burning reactions, in particular, $^{12}$C+$^{12}$C fusion, are important for the understanding interpretation of late phases stellar evolution as well ignition nucleosynthesis cataclysmic binary systems such type Ia supernovae x-ray superbursts. A new measurement this reaction has been performed at University Notre Dame using particle-$\gamma$ coincidence techniques with SAND (a silicon detector array) high-intensity 5U Pelletron accelerator. New results fusion low...
The influence of high-energy (1.6 MeV) Ar2+ irradiation on the interfacial interaction between cerium oxide thin films (∼15 nm) with a SiO2/Si substrate is investigated using transmission electron microscopy, ultrahigh vacuum x-ray photoelectron spectroscopy (XPS), and carbon monoxide (CO) oxidation catalytic reaction ambient pressure XPS. combination these methods allows probing dynamics vacancy generation its relation to chemical interactions at CeO2/SiO2/Si interface. results suggest that...
Precise antineutrino measurements are very sensitive to proper background characterization. We present an improved measurement of the ^{13}C(α,n)^{16}O reaction cross section which constitutes significant for large ν[over ¯] detectors. greatly improve precision and accuracy by utilizing a setup that is neutron energies while making excited state transitions via secondary γ-ray detection. Our results shows 54% reduction in contributions from ^{16}O(3^{-},6.13 MeV) used KamLAND analysis.
Nucleosynthesis in the first generation of massive stars offers a unique setting to explore creation heavier nuclei an environment free impurities from earlier stellar generations. In later generations stars, hydrogen burning occurs predominantly through CNO cycles, but without carbon, nitrogen, and oxygen catalyze reaction sequence, would have rely on inefficient $pp$ chains for their energy production. Observations second third show pronounced abundances carbon isotopes, which suggests...
Background: A multitude of broad interfering resonances characterize the $^{10}\mathrm{B}(p,\ensuremath{\alpha})^{7}\mathrm{Be}$ cross section at low energies. The complexity reaction mechanism, as well conflicting experimental measurements, have so far prevented a reliable prediction over energy ranges pertinent for boron-proton fusion reactor environment.Purpose: To improve evaluated reaction, this study targets proton region from 0.8 to 2.0 MeV, where kinematic overlap scattered protons...
The ^{19}Ne(p,γ)^{20}Na reaction is the second step of a chain which breaks out from hot CNO cycle, following ^{15}O(α,γ)^{19}Ne at onset x-ray burst events. We investigate spectrum lowest proton-unbound states in ^{20}Na an effort to resolve contradictions spin-parity assignments and extract reliable information about thermal rate. proton-transfer ^{19}Ne(d,n)^{20}Na measured with beam radioactive isotope ^{19}Ne energy around Coulomb barrier inverse kinematics. observe three proton...
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...
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 CNO cycle is the main energy source in massive stars during their hydrogen burning phase, and, for our sun, it contributes at $\ensuremath{\approx}1%$ level. As $^{14}\mathrm{N}(p,\ensuremath{\gamma})^{15}\mathrm{O}$ reaction slowest cycle, determines production rate and thus contribution to solar neutrino flux. These neutrinos are produced primarily from $\ensuremath{\beta}$ decay of $^{15}\mathrm{O}$ a lesser extent, $^{13}\mathrm{N}$. Solar challenging detect, but they can provide...
Clustering phenomena in 10Be and 18O were studied by means of resonance elastic scattering α-particles on 6He 14C. Excitation functions for α+6He α+14C measured detailed R-matrix analyses the excitation was performed. We compare experimental results with predictions modern theoretical approaches discuss properties cluster rotational bands.
A measurement of the $^{54}\mathrm{Fe}(d,p)^{55}\mathrm{Fe}$ reaction at 16 MeV was performed using Florida State University Super-Enge Split-Pole Spectrograph to determine single-neutron energies for $2{p}_{3/2}, 2{p}_{1/2}, 1{f}_{5/2}, 1{g}_{9/2}$, and $2{d}_{5/2}$ orbits. Two states were observed that had not been in previous ($d,p$) measurements. In addition, we made angular momentum transfer, $L$, assignments four changed $L$ from measurements nine more states. The spin-orbit splitting...
The National Ignition Facility (NIF) provides the opportunity to study nuclear reactions under controlled conditions at high temperatures and pressures a level never before achieved. However, timescale of deuterium-tritium (DT) implosion is only few nanoseconds, making data collection diagnostics very challenging. One method that has been proposed for obtaining additional information about activate dopant material using $\ensuremath{\alpha}$ particles produced from DT fuel as diagnostic....
A measurement of the $^{50}$Ti($d$,$p$)$^{51}$Ti reaction at 16 MeV was performed using a Super Enge Split Pole Spectrograph to measure magnitude $N=32$ subshell gap in Ti. Seven states were observed that had not been previous ($d$,$p$) measurements, and \textit{L} transfer values for six previously measured either changed or first time. The results used determine single neutron energies $p_{3/2}$, $p_{1/2}$ $f_{5/2}$ orbitals. resulting $^{51}$Ti confirm existence These those from...
The $^{18}\mathrm{Ne}(\ensuremath{\alpha},p)^{21}\mathrm{Na}$ reaction plays a significant role in Type-I X-ray bursts. It is major path the breakout from hot-CNO cycles to synthesis of heavier elements $\ensuremath{\alpha}p$- and $rp$-processes. An experiment determine cross section this was performed with ANASEN active-target detector system, determining at energies between 2.5 4 MeV center-of-mass frame. measured sections for reactions populating ground state $^{21}\mathrm{Na}$ are...
The $^{23}\mathrm{Na}(p,\ensuremath{\gamma})^{24}\mathrm{Mg}$ reaction plays an important role in the nucleosynthesis of elements hot bottom burning environment asymptotic giant branch stars by providing a breakout path from NeNa cycle to MgAl cycle. At temperatures above $\ensuremath{\approx}0.06$ GK, underlying nuclear contributions rate are primarily narrow resonances, but at lower direct and broad resonance tail come dominate. While there have been recent studies improve uncertainties...
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.