A5031622736- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Astronomical and nuclear sciences
- Medical Imaging Techniques and Applications
- Radiation Therapy and Dosimetry
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Plasma Diagnostics and Applications
- Advanced NMR Techniques and Applications
- Atmospheric Ozone and Climate
- Luminescence Properties of Advanced Materials
- Atomic and Molecular Physics
- Nuclear and radioactivity studies
- Particle accelerators and beam dynamics
- Scientific Research and Discoveries
- Surface Roughness and Optical Measurements
- Radiation Effects in Electronics
- Fusion materials and technologies
- Graphite, nuclear technology, radiation studies
- X-ray Spectroscopy and Fluorescence Analysis
- Inorganic Fluorides and Related Compounds
- Dark Matter and Cosmic Phenomena
University of California, Berkeley
2016-2025
University of California, Davis
2020
Lawrence Berkeley National Laboratory
2012-2020
Lawrence Livermore National Laboratory
2016-2018
Sandia National Laboratories California
2018
Improved neutron inelastic scattering cross sections have repeatedly been identified as a top priority nuclear data need, important for basic science and range of applications in energy, stockpile stewardship, proliferation detection. For the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mmultiscripts><a:mi mathvariant="normal">C</a:mi><a:mprescripts/><a:none/><a:mn>12</a:mn></a:mmultiscripts></a:math>(<c:math...
Recent progress in the development of novel organic scintillators necessitates modern characterization capabilities. As primary means energy deposition by neutrons these materials is n-p elastic scattering, knowledge proton light yield paramount. This work establishes a new model-independent method to continuously measure over broad range. Using deuteron breakup neutron source at 88-Inch Cyclotron Lawrence Berkeley National Laboratory and an array scintillators, EJ-301 EJ-309, commercially...
The level density and $\ensuremath{\gamma}$-ray strength function ($\ensuremath{\gamma}\mathrm{SF}$) of $^{243}\text{Pu}$ have been measured in the quasicontinuum using Oslo method. Excited states were populated $^{242}\text{Pu}(d,p)$ reaction. closely follows constant-temperature formula for excitation energies above pairing gap. $\ensuremath{\gamma}\mathrm{SF}$ displays a double-humped resonance at low energy as also seen previous investigations actinide isotopes. structure is interpreted...
Nuclear fusion is a potential source of carbon-free electricity with many concepts in development. The Portable and Adaptable Neutron Diagnostics for Advancing Fusion Energy Science (PANDA-FES) suite has been deployed since 2021 to measure neutron yield, energy, spatiotemporal location at two different Z-pinch devices. This diagnostic can be used variety facilities pursuing the magnetic, inertial, magneto-inertial regimes. These regimes have wide range time scales from less than 100 ns few...
Ionization quenching models were assessed by evaluating light yield data from multiple organic scintillators and recoil ions over a fission spectrum neutron energy range, important for basic science applications.
This work presents the first experimentally determined nuclear level density and $\ensuremath{\gamma}$-ray strength function of short-lived fission product $^{93}\mathrm{Sr}$, accomplished using $\ensuremath{\beta}$-Oslo method. Direct measurement $^{92}\mathrm{Sr}(n,\ensuremath{\gamma})^{93}\mathrm{Sr}$ cross section is not currently possible, as half-life 2.66 hours too short; instead, $^{93}\mathrm{Sr}$ was formed through $\ensuremath{\beta}$ decay $^{93}\mathrm{Rb}$ to excitation...
The fusion Z-pinch experiment (FuZE) is a sheared-flow stabilized designed to study the effects of flow stabilization on deuterium plasmas with densities and temperatures high enough drive nuclear reactions. Results from FuZE show pinch currents neutron emission durations thousands times longer than instability growth times. While these results are consistent thermonuclear emission, energetically resolved measurements stronger constraint origin production. This stems strong anisotropy in...
Abstract The proton light yield of liquid scintillators is an important property in the context their use large-scale neutrino experiments, with direct implications for neutrino-proton scattering measurements and discrimination fast neutrons from inverse $$\beta $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>β</mml:mi> </mml:math> -decay coincidence signals. This work presents first measurement a water-based scintillator (WbLS) formulated 5% linear alkyl benzene (LAB),...
The absolute light yield of a scintillator, defined as the number scintillation photons produced per unit energy deposited, is useful quantity for scintillator development, research, and applications. Yet, literature data on organic scintillators are limited. goal this work to assess suitability EJ-204 plastic from Eljen Technology serve reference standard measurements scintillators. Four samples were examined: two manufactured approximately four months prior stored in high-purity nitrogen,...
Background: The structure of the semimagic $_{50}\mathrm{Sn}$ isotopes were previously studied via measurements $B(E2;{2}_{1}{}^{+}\ensuremath{\rightarrow}{0}_{1}{}^{+}$) and $g$ factors ${2}_{1}{}^{+}$ states. values $B(E2;{2}_{1}{}^{+}$) in below midshell at $N$ = 66 show an enhancement collectivity, contrary to predictions from shell-model calculations.Purpose: This work presents first measurement $2{}_{1}{}^{+}$ $4{}_{1}{}^{+}$ states' magnetic moments unstable neutron-deficient...
Background: Organic scintillators are widely used for neutron detection in both basic nuclear physics and applications. While the proton light yield of organic has been extensively studied, measurements from interactions with carbon nuclei scarce.Purpose: Demonstrate a new approach simultaneous measurement scintillators. Provide data EJ-309 liquid EJ-204 plastic scintillators.Method: A 33-MeV $^{2}\mathrm{H}^{+}$ beam 88-Inch Cyclotron at Lawrence Berkeley National Laboratory was impinged...
In this work, we present new data on the $^{182,183,184}\mathrm{W}(\ensuremath{\gamma},n$) cross sections, utilizing a quasi-monochromatic photon beam produced at NewSUBARU synchrotron radiation facility. Further, have extracted nuclear level density and $\ensuremath{\gamma}$-ray strength function of $^{186}\mathrm{W}$ from $^{186}\mathrm{W}(\ensuremath{\alpha},{\ensuremath{\alpha}}^{\ensuremath{'}}\ensuremath{\gamma})^{186}\mathrm{W}$ reaction measured Oslo Cyclotron Laboratory. Combining...
Nuclear resonance fluorescence (NRF), a process by which nucleus is excited absorption of specific quantum energy and then deexcites via the emission one or more $\ensuremath{\gamma}$ rays, may be applied to nondestructively measure isotopic composition sample. NRF excitations in ${}^{240}$Pu were identified range 2.1 2.8 MeV using 3-MeV bremsstrahlung source. Utilizing high-purity germanium detectors at backward angles, nine resonances this range. The measured integrated cross sections from...
The Oslo method has been applied to particle-$\ensuremath{\gamma}$ coincidences following the $^{239}\mathrm{Pu}(d,p)$ reaction obtain nuclear level density (NLD) and $\ensuremath{\gamma}$-ray strength function ($\ensuremath{\gamma}\mathrm{SF}$) of $^{240}\mathrm{Pu}$. experiment was conducted with a 12 MeV deuteron beam at Cyclotron Laboratory. low spin transfer this leads spin-parity mismatch between populated intrinsic levels. This is challenge for as it can have significant impact on...
Background: The Cd isotopes are well studied, but experimental data for the rare sparse. At energies above Coulomb barrier, higher states become accessible.Purpose: Remeasure and supplement existing lifetimes magnetic moments of low-lying in $^{106}\mathrm{Cd}$.Methods: In an inverse kinematics reaction, a $^{106}\mathrm{Cd}$ beam impinging on $^{12}\mathrm{C}$ target was used to excite projectiles. high recoil velocities provide unique opportunity measure $g$ factors with transient-field...
An organic glass scintillator developed by Sandia National Laboratories was characterized in terms of its light output and pulse shape discrimination (PSD) properties compared to commercial liquid (EJ-309) plastic (EJ-276) scintillators. The electron determined through relative comparison the $^{137}$Cs Compton edge location. proton yield measured using a double time-of-flight technique at 88-Inch Cyclotron Lawrence Berkeley Laboratory. Using tunable broad-spectrum neutron source an array...
Prompt fission $\gamma$-rays are responsible for approximately 5\% of the total energy released in fission, and therefore important to understand when modelling nuclear reactors. In this work we present prompt $\gamma$-ray emission characteristics first time as a function excitation fissioning system. Emitted spectra were measured, multiplicities average $\gamma$ energies per determined $^{233}$U(d,pf) reaction between 4.8 10 MeV, $^{239}$Pu(d,pf) 4.5 9 MeV. The spectral show no significant...