A5020497585- Nuclear physics research studies
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Advanced Chemical Physics Studies
- Quantum Chromodynamics and Particle Interactions
- Radiation Therapy and Dosimetry
- X-ray Spectroscopy and Fluorescence Analysis
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Nuclear Materials and Properties
- Advanced NMR Techniques and Applications
- Particle physics theoretical and experimental studies
- Electron and X-Ray Spectroscopy Techniques
- Quantum, superfluid, helium dynamics
- Scientific Research and Discoveries
- Crystallography and Radiation Phenomena
- Radioactive Decay and Measurement Techniques
- Boron Compounds in Chemistry
- Fusion materials and technologies
- Rare-earth and actinide compounds
- Graphite, nuclear technology, radiation studies
- Superconducting Materials and Applications
- Ion-surface interactions and analysis
Ohio University
2014-2023
Triangle Universities Nuclear Laboratory
2018
Duke University
2018
Ohio University Lancaster
2014
Lawrence Livermore National Laboratory
1985-2008
Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute
2002
Oregon State University
1975-1997
Los Alamos National Laboratory
1987-1995
Beijing Normal University
1995
National Institute of Standards and Technology
1995
Evidence for the ground state of neutron-unbound nucleus 26O was observed first time in single proton-knockout reaction from a 82 MeV/u 27F beam. Neutrons were measured coincidence with 24O fragments. determined to be unbound by 150+50-150 keV observation low-energy neutrons. This result agrees recent shell model calculations based on microscopic two- and three-nucleon forces.
Cross sections have been measured for the emission of protons, deuterons, and alpha particles 15-MeV neutrons on $^{54,56}\mathrm{Fe}$, $^{58,60}\mathrm{Ni}$, $^{50,52}\mathrm{Cr}$, $^{63,65}\mathrm{Cu}$, as well natural iron, nickel, chromium. A quadrupole spectrometer served to detect with energies low 1 MeV. For some targets, a substantial fraction charged-particle spectrum is at below Coulomb barrier. spectra are compared statistical pre-equilibrium model predictions.NUCLEAR REACTIONS...
Using pulsed-beam neutron time-of-flight spectrometry relative differential cross sections for $^{7}\mathrm{Li}(p,{n}_{0})^{7}\mathrm{Be}$(g.s.) and $^{7}\mathrm{Li}(p,{n}_{1})^{7}\mathrm{Be}^{*}$ (0.431 MeV) have been measured over the laboratory angular range 3.5\ifmmode^\circ\else\textdegree\fi{} to 159\ifmmode^\circ\else\textdegree\fi{} from an incident bombarding energy of 4.2 26 MeV. These integrated angle at 5 MeV resulting integral was normalized absolute measurement Macklin Gibbons...
A recent study of nuclear level densities for $20<~A<~70$ found evidence that the nuclei off stability line were lower than those nearby on line. This analysis has been extended to cover mass range $20<~A<~110$ with results support original conclusions. As part study, variations energy and number parity ratio spin cutoff parameter are examined.
Neutron spectra produced by ($p,n$) reactions on $^{48}\mathrm{Ti}$, $^{49}\mathrm{Ti}$, $^{55}\mathrm{Mn}$, $^{58}\mathrm{Fe}$, and $^{63}\mathrm{Cu}$ ($\ensuremath{\alpha},n$) $^{45}\mathrm{Sc}$, $^{51}\mathrm{V}$, $^{52}\mathrm{Cr}$, $^{59}\mathrm{Co}$, $^{60}\mathrm{Ni}$ have been measured at four bombarding energies. The component of the corresponding to equilibrium (evaporation) processes was identified from angular energy dependence continuum cross sections. Level density parameters...
The thick-target neutron energy spectra of the 9Be(p,n) reaction were measured at several angles for proton-bombarding energies 3.0, 3.4, 3.7, 4.0, and 5.0 MeV. Time-of-flight techniques used to determine discriminate against background radiation. By using lithium-loaded glass scintillators low proton pulse rate frequency, have been determined as 70 keV. detectors calibrated efficiency spectrum Al(d,n) reaction, which was accurately fission chamber detectors.
Cross sections for the ($n,xp$), ($n,d$), and ($n,x\ensuremath{\alpha}$) reactions 15-MeV neutrons on $^{51}\mathrm{V}$ $^{93}\mathrm{Nb}$ have been measured with a magnetic quadrupole spectrometer. The importance of ($n,{n}^{\ensuremath{'}}p$) reaction as source protons is examined by comparing these results those recently obtained $^{46}\mathrm{Ti}$. Good fits to ($n,xp$) energy spectra require contributions from both equilibrium nonequilibrium reactions, while only latter appear in...
Cross Sections for (n,xp), (n,xd), and (n,xα) reactions induced by 15-MeV neutrons on 27Al, 46Ti, 48Ti have been measured with a quadrupole spectrometer. Particles energies as low 800 keV were detected. Large sub-Coulomb-barrier peaks are found in the proton spectra from 27Al but not 48Ti; alpha-particle deuteron do show such peak. The presence or absence of peak is to be related importance (n,n’p) reaction given isotope. Enhancement total proton-pro-duction cross section almost factor 2 through 46Ti
The Hauser-Feshbach formalism is generalized to include isospin. Examination of the consequences this extension for typical nuclei indicates that significant enhancement in cross section emission protons proton-induced reactions predicted. Level widths and densities deduced from fluctuation measurements are also affected. results some interpreted terms isospin effects; new experiments proposed which should yield information on mixing level states with differing
The first measurements of the transferred polarization for exclusive e-->p-->e(')K+Lambda--> reaction have been performed at Jefferson Laboratory using CLAS spectrometer. A 2.567 GeV beam was used to measure hyperon over Q2 from 0.3 1.5 (GeV/c)(2), W 1.6 2.15 GeV, and full K+ center-of-mass angular range. Comparison with predictions hadrodynamic models indicates strong sensitivity underlying resonance contributions. nonrelativistic quark-model interpretation our data suggests that ssmacr;...
The two-step cascade method previously used in neutron capture experiments is now applied to a proton reaction. spectrum of cascades populating the first 2+ level 60Ni has been measured with 59Co(p,2gamma)60Ni simulation technique for analysis allows one reveal range possible shapes both E1 and M1 gamma-strength functions. low-energy enhancement observed 3He induced reactions seen appear strength functions 60Ni.
Neutron and proton evaporation spectra from the $^{6}\mathrm{Li}+^{55}\mathrm{Mn}$ $d+^{59}\mathrm{Co}$ reactions have been analyzed with Hauser-Feshbach approach using different input models for nuclear level densities of $^{60}\mathrm{Ni}$ $^{60}\mathrm{Co}$ nuclei. It has found that a Fermi-gas like temperature dependence fail to reproduce particle both simultaneously. We obtained surprising result only way describe our data is assume independence on excitation energy up about 20 MeV range.
The spectral continua ${\mathit{E}}_{\mathit{n}}$\ensuremath{\ge}30 MeV of neutrons from the reactions $^{27}\mathrm{Al}$, $^{90}\mathrm{Zr}$, $^{208}\mathrm{Pb}$(p,xn) have been measured for ${\mathit{E}}_{\mathit{p}}$=120 and 160 angles 0\ifmmode^\circ\else\textdegree\fi{}\ensuremath{\le}\ensuremath{\theta}\ensuremath{\le}145\ifmmode^\circ\else\textdegree\fi{}. Angular distributions can be explained quantitatively in absolute values shapes over five orders magnitude as statistical...
Double differential cross sections have been measured with time of flight techniques at 16 angles between 3.5\ifmmode^\circ\else\textdegree\fi{} and 159\ifmmode^\circ\else\textdegree\fi{} (lab) for the inclusive production neutrons from reactions 25 MeV protons $^{50,52,53}\mathrm{Cr}$, $^{54,56,58}\mathrm{Fe}$, $^{59}\mathrm{Co}$, $^{60}\mathrm{Ni}$, $^{63}\mathrm{Cu}$, $^{89}\mathrm{Y}$, $^{90,91,92,94}\mathrm{Zr}$, $^{92,94,95,96,97,98,100}\mathrm{Mo}$, $^{110}\mathrm{Pd}$, 18...
The energy spectra of neutrons, protons, and alpha-particles have been measured from the d+59Co 3He+58Fe reactions leading to same compound nucleus, 61$Ni. experimental cross sections compared Hauser-Feshbach model calculations using different input level density models. None them found agree with experiment. It manifests serious problem available parameterizations especially those based on neutron resonance spacings discrete levels. New densities corresponding Fermi-gas parameters obtained...
The neutron spectra produced by the $^{51}\mathrm{V}(p,n)^{51}\mathrm{Cr}$, $^{59}\mathrm{Co}(p,n)^{59}\mathrm{Ni}$, $^{48}\mathrm{Ti}(\ensuremath{\alpha},n)^{51}\mathrm{Cr}$, and $^{56}\mathrm{Fe}(\ensuremath{\alpha},n)^{59}\mathrm{Ni}$ reactions were measured at five angles between 15 135\ifmmode^\circ\else\textdegree\fi{} for proton energies 7.8 14.7 MeV, $\ensuremath{\alpha}$ 11.5 22.7 MeV. Spectra low used to obtain spin-weighted level density of residual nuclei $^{51}\mathrm{Cr}$...
Additional experimental information concerning the level structure of $^{26}\mathrm{Si}$ above proton threshold is needed to reduce uncertainties in $^{25}\mathrm{Al}(p,\ensuremath{\gamma})^{26}\mathrm{Si}$ reaction rate and consequently better determine $^{26}\mathrm{Al}$ radioisotope production astrophysical environments. The $^{24}\mathrm{Mg}(^{3}\mathrm{He},n)^{26}\mathrm{Si}$ was measured excitation energies states were determined with improved accuracy. Spins assigned a number by...