A5033101144- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Quantum Chromodynamics and Particle Interactions
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Nuclear reactor physics and engineering
- Astronomical and nuclear sciences
- Neutrino Physics Research
- Advanced NMR Techniques and Applications
- Mass Spectrometry Techniques and Applications
- Advanced Chemical Physics Studies
- Particle Detector Development and Performance
- Electron and X-Ray Spectroscopy Techniques
- Atmospheric Ozone and Climate
- Radiation Therapy and Dosimetry
- Spectroscopy and Laser Applications
- Astro and Planetary Science
- Radioactive Decay and Measurement Techniques
- Ion-surface interactions and analysis
- Medical Imaging Techniques and Applications
- Scientific Research and Discoveries
- Black Holes and Theoretical Physics
- Radiation Effects in Electronics
GGG (France)
2023
University of Notre Dame
2014-2022
Joint Institute for Nuclear Astrophysics
2015-2022
Rutgers, The State University of New Jersey
2011-2022
Karlsruhe Institute of Technology
2019
Lawrence Livermore National Laboratory
2017
Vanderbilt University
2017
We have measured the scintillation and ionization yield of recoiling nuclei in liquid argon as a function applied electric field by exposing dual-phase time projection chamber (LAr-TPC) to low energy pulsed narrow band neutron beam produced at Notre Dame Institute for Structure Nuclear Astrophysics. Liquid counters were arranged detect identify neutrons scattered TPC select nuclei. report measurements yields nuclear recoils with energies from 10.3 57.3 keV median fields 0 $970\text{ }\text{...
Irradiations of $^{239}\mathrm{Pu}$ and $^{240}\mathrm{Pu}$ targets with $^{48}\mathrm{Ca}$ beams aimed at the synthesis $Z=114$ flerovium isotopes were performed Dubna Gas Filled Recoil Separator. A new spontaneously fissioning (SF) isotope $^{284}\mathrm{Fl}$ was produced for first time in $^{240}\mathrm{Pu}+^{48}\mathrm{Ca}$ (250 MeV) $^{239}\mathrm{Pu}+^{48}\mathrm{Ca}$ (245 reactions. The cross section $^{239}\mathrm{Pu}(^{48}\mathrm{Ca},3n)^{284}\mathrm{Fl}$ reaction channel about 20...
The work of Blatt has been extended to include ionized-impurity scattering in degenerate $n$-type material having a single-valley conduction band and spherical effective mass. transport cross section $Q$ calculated for potential the Thomas-Fermi type where inverse screening length is fixed by Friedel sum rule. By writing Schr\"odinger equation terms dimensionless variables, we have found that, as consequence rule, $Q{k}^{2}$ universal function ${a}_{0}k$, ${a}_{0}$ first Bohr radius $k$...
Big Bang nucleosynthesis calculations, constrained by the Wilkinson Microwave Anisotropy Probe results, produce ${}^{7}$Li abundances almost a factor of four larger than those extrapolated from observations. Since primordial is believed to be mostly produced beta decay ${}^{7}$Be, one proposed solution this discrepancy resonant enhancement ${}^{7}$Be($d,p$)2$\ensuremath{\alpha}$ reaction rate through 5/2${}^{+}$ 16.7-MeV state in ${}^{9}$B. The ${}^{2}$H(${}^{7}$Be,$d$)${}^{7}$Be was used...
We have measured the ionization efficiency of silicon nuclear recoils with kinetic energy between 1.8 and 20 keV . bombarded a silicon-drift diode neutron beam to perform an elastic-scattering experiment. A broad-energy spectrum was used recoil reconstructed using measurement time flight scattering angle scattered neutron. The overall trend results this work is well described by theory Lindhard et al. above 4 energy. Below energy, presented data shows deviation from model. indicates faster...
Electromagnetic observables are able to give insight into collective and emergent features in nuclei, including nuclear clustering. These also provide strong constraints for ab initio theory, but comparison of these between theory experiment can be difficult due the lack convergence relevant calculated values, such as $E2$ transition strengths. By comparing ratios strengths mirror transitions, we find that a wide range calculations robust consistent predictions this ratio. To experimentally...
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...
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...
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 $^{25}\mathrm{Al}$ 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 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...
The low-energy recoiling ions from the $\ensuremath{\beta}$ decay of $^{134}\mathrm{Sb}$ were studied by using Beta-decay Paul Trap. Using this apparatus, singly charged suspended in vacuum at center a detector array used to detect emitted particles, $\ensuremath{\gamma}$ rays, and recoil coincidence. emerge trap with negligible scattering, allowing $\ensuremath{\beta}$-decay properties charge-state distribution daughter be determined $\ensuremath{\beta}$-ion coincidences. First-forbidden...
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.
Beta-delayed-neutron ($\beta$n) spectroscopy was performed using the Beta-decay Paul Trap and an array of radiation detectors. The $\beta$n branching ratios energy spectra for $^{135,136}$Sb $^{140}$I were obtained by measuring time flight recoil ions emerging from trapped ion cloud. These nuclei are located at edge isotopic region identified as having that impact r-process abundance pattern around A~130 peak. For $^{140}$I, 14.6(11)%, 17.6(28)%, 7.6(28)% determined, respectively. $^{135}$Sb...
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.
Within a German government funded project the partners Siemens AG and KIT have developed an iron-free inductive current limiter. The aimed at device for medium voltage range, i.e. U = 10 kV with nominal power of MVA. One phase this limiter was designed, manufactured successfully tested. is based on stack closed superconducting ReBCO rings inserted into conventional reactor coil. Under normal operation conditions, shield inner part With occurrence short circuit quench impedance coil becomes...
A detailed study of the $\ensuremath{\beta}$-delayed neutron emission properties $^{137,138}\mathrm{I}$ and $^{144,145}\mathrm{Cs}$ has been performed by confining ions in Beta-decay Paul Trap. The daughter following $\ensuremath{\beta}$ decay emerge from trapped-ion cloud with negligible scattering allowing reconstruction recoil-ion energy time flight. From this information, neutron-emission branching ratios neutron-energy spectra were deduced. results for $^{137}\mathrm{I}$ decays are...
The $^{24}\mathrm{Mg}(p,\ensuremath{\alpha})^{21}\mathrm{Na}$ reaction was measured at the Holifield Radioactive Ion Beam Facility of Oak Ridge National Laboratory to study spectroscopy radionuclide $^{21}\mathrm{Na}$. A 31-MeV proton beam from 25 MV tandem accelerator bombarded isotopically enriched $^{24}\mathrm{Mg}$ targets. Recoiling $^{4}\mathrm{He}$ particles were identified by an annular silicon strip detector array. Two energy levels ${E}_{x}=6.594$ and 7.132 MeV observed for first...