A5088720718- Nuclear Physics and Applications
- Nuclear physics research studies
- Atomic and Molecular Physics
- Nuclear reactor physics and engineering
- Radioactive contamination and transfer
- Astro and Planetary Science
- Astronomical and nuclear sciences
- X-ray Spectroscopy and Fluorescence Analysis
- Mass Spectrometry Techniques and Applications
- Hydraulic and Pneumatic Systems
- Isotope Analysis in Ecology
- Radiation Therapy and Dosimetry
- Ion-surface interactions and analysis
- Particle accelerators and beam dynamics
- Radioactivity and Radon Measurements
- Radiation Detection and Scintillator Technologies
- Geology and Paleoclimatology Research
- Heavy metals in environment
- Radioactive element chemistry and processing
- Radioactive Decay and Measurement Techniques
- Gamma-ray bursts and supernovae
- Quantum, superfluid, helium dynamics
- International Maritime Law Issues
- Groundwater flow and contamination studies
- Boron Compounds in Chemistry
Hebrew University of Jerusalem
2015-2024
Pacific University
2022-2024
Laurentian University
2014-2024
Google (United States)
2024
University of Colorado Boulder
2022-2024
Lawrence Livermore National Laboratory
2022-2024
Pacific University Oregon
2017-2023
Milwaukee School of Engineering
2008-2022
Stiftung Wissenschaft und Politik, German Institute for International and Security Affairs
2022
Ashland (United States)
2022
Fusion-evaporation cross sections for $^{64}\mathrm{N}\mathrm{i}+^{64}\mathrm{N}\mathrm{i}$ have been measured down to the 10 nb level. For fusion between two open-shell nuclei, this is first observation of a maximum in $S$-factor, which signals strong sub-barrier hindrance. A comparison with $^{58}\mathrm{N}\mathrm{i}+^{58}\mathrm{N}\mathrm{i}$, $^{58}\mathrm{N}\mathrm{i}+^{60}\mathrm{N}\mathrm{i}$, and $^{58}\mathrm{N}\mathrm{i}+^{64}\mathrm{N}\mathrm{i}$ systems indicates dependence...
Measurements of the total fusion cross sections for $^{12}\mathrm{C}$ + $^{12}\mathrm{C}$, $^{13}\mathrm{C}$, $^{14}\mathrm{N}$, $^{15}\mathrm{N}$, $^{16}\mathrm{O}$, $^{18}\mathrm{O}$, and $^{19}\mathrm{F}$ $^{16}\mathrm{O}$ have been performed over energy range from 1.5 to 3 times Coulomb barrier energy. Fusion parameters were extracted each system. Three systems, show rather pronounced oscillatory structure in dependence sections. The maximum systems studied vary by as much 10-20%,...
The extinct p-process nuclide 146Sm serves as an astrophysical and geochemical chronometer through measurements of isotopic anomalies its alpha-decay daughter 142Nd. Based on analyses 146Sm/147Sm alpha-activity atom ratios, we determined the half-life to be 68 \pm 7 (1sigma) million years (Ma), which is shorter than currently used value 103 5 Ma. This implies a higher initial abundance in early solar system, (146Sm/144Sm_0 = 0.0094\pm0.0005 (2sigma), previously estimated. Terrestrial, Lunar...
Abstract Half of the heavy elements including all actinides are produced in r -process nucleosynthesis, whose sites and history remain a mystery. If continuously produced, Interstellar Medium is expected to build-up quasi-steady state abundances short-lived nuclides (with half-lives ≤100 My), nucleosynthesis. Their existence today’s interstellar medium would serve as radioactive clock establish that their production was recent. In particular 244 Pu, actinide nuclide (half-life=81 can place...
Natural plutonium from supernovae The rapid neutron capture process (r-process) produces many of the heavy chemical elements, but astrophysical settings where it occurs remain unclear. Leading candidates are star mergers and some types supernovae. Wallner et al. analyzed content a deep-sea crust sample, identifying few dozen atoms r-process isotope plutonium- 244 that were delivered to Earth within past million years. There was simultaneous signal iron-60, which is known be produced in...
The fusion-fission cross section for the system ${}^{17}\mathrm{F}{+}^{208}\mathrm{Pb}$ involving drip line nucleus ${}^{17}\mathrm{F}$ has been measured at energies in vicinity of Coulomb barrier. No enhancement yields due to breakup or a large interaction radius was observed.
The proton yields from the interaction of pions on nuclear targets with $12<~A<~181$ were measured in region $\ensuremath{\Delta}(3, 3)$ resonance. shift energies angle is analyzed terms average number nucleons that have participated absorbing pion's momentum and total energy. effective interacting nucleons, for both ${\ensuremath{\pi}}^{+}$ ${\ensuremath{\pi}}^{\ensuremath{-}}$ incident, found to be \ensuremath{\sim} 3 $^{12}\mathrm{C}$ increasing 5.5 $^{181}\mathrm{Ta}$. These numbers are...
The excitation function for the fusion-evaporation reaction 64Ni+100Mo has been measured down to a cross-section of ~5 nb. Extensive coupled-channels calculations have performed, which cannot reproduce steep fall-off at extreme sub-barrier energies. Thus, this system exhibits hindrance fusion, phenomenon that discovered only recently. In S-factor representation introduced quantify hindrance, maximum is observed E_s=120.6 MeV, corresponds 90% reference energy E_s^ref, value expected from...
The half-life of $^{32}\mathrm{Si}$ has been measured to be ${T}_{\frac{1}{2}}=101\ifmmode\pm\else\textpm\fi{}18$ yr, considerably shorter than the previously accepted value \ensuremath{\approx} 300 yr. new was obtained by measuring specific $\ensuremath{\beta}$ activity with a liquid-scintillation-counter technique and concentration tandem-accelerator mass spectrometry. It is expected that present result will have strong impact on studies cosmogenic $^{32}\mathrm{Si}$.
A research program is in progress at Brookhaven National Laboratory to determine the nature of atmospheric diffusion from a representative oceanic site, relate observed patterns meteorological and oceanographic variables, develop models describe such diffusion. The was initiated response plans for construction offshore nuclear power plants. Tracer experiments are conducted utilizing oil-fog smoke released boat stationed 1 3 miles during onshore flows. photographed above side document lateral...
We examine herein the decay constants, λk which appear in modal expansion of neutron density a study time-dependent thermalization neutrons. A proton gas moderator indicates existence an infinite number discrete range . The upper limit is point for eigenvalue sequence. Consideration more general models spectrum 0 min and max continuous
The 62Ni(n,gamma)63Ni(t_1/2=100+-2 yrs) reaction plays an important role in the control of flow path slow neutron-capture (s-) nucleosynthesis process. We have measured for first time total cross section this a quasi-Maxwellian (kT = 25 keV) neutron flux. measurement was performed by fast-neutron activation, combined with accelerator mass spectrometry to detect directly 63Ni product nuclei. experimental value 28.4+-2.8 mb, fairly consistent recent theoretical estimate, affects calculated net...
Excitation functions were measured at forward angles for the reaction $^{24}\mathrm{Mg}$($^{16}\mathrm{O}$, $^{12}\mathrm{C}$)$^{28}\mathrm{Si}$ to ground and first excited states of $^{28}\mathrm{Si}$. Resonancelike structures found in both excitation with pronounced maxima center-of-mass energies \ensuremath{\sim} 28, 31, 34 MeV. Angular distributions obtained these three are fitted rather well ${{P}_{L}}^{2}(cos\ensuremath{\theta})$ $L=21, 23, \mathrm{and} 25$, respectively.
Neutrons produced by the ${}^{7}$Li($p$,$n$)${}^{7}$Be reaction close to threshold are widely used measure cross section of $s$-process nucleosynthesis reactions. While experiments have been performed so far with Van de Graaff accelerators, future use rf accelerators higher intensities is planned enable investigations on radioactive targets. Such have, however, poorer energy definition. We investigate in this work effects an energy-broadened proton beam spectrum neutrons emitted thick-target...