A5091885945- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Advanced NMR Techniques and Applications
- Superconducting Materials and Applications
- Quantum, superfluid, helium dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Radiation Therapy and Dosimetry
- Advanced Chemical Physics Studies
- High-Energy Particle Collisions Research
- High-pressure geophysics and materials
- Scientific Research and Discoveries
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Nuclear reactor physics and engineering
- Neutrino Physics Research
- Astronomical and nuclear sciences
- Electron and X-Ray Spectroscopy Techniques
- Crystallography and Radiation Phenomena
- Advanced X-ray Imaging Techniques
University of Bonn
2023-2025
Indiana University Bloomington
2005-2019
Campbell Collaboration
2009
Indiana University
2008
University of Michigan
2003
Virginia Tech
2002
University of Wisconsin–Madison
1972-2000
Thomas Jefferson National Accelerator Facility
1995
University of Kentucky
1993
Universität Hamburg
1993
Elastic scattering of polarized protons 80-180 MeV from a number target nuclei ($24<A<208$) has been measured. The systematic energy and mass dependence the cross section analyzing power angular distributions is discussed. data have analyzed within framework conventional optical potential model, behavior parameters as function investigated. Comparisons are made with results obtained at energies greater than 180 predictions microscopic models.NUCLEAR REACTIONS...
The total cross section for the reaction pp\ensuremath{\rightarrow}pp${\mathrm{\ensuremath{\pi}}}^{0}$ was measured at nine center-of-mass energies from 1.5 to 23 MeV above threshold. experiment carried out with Indiana Cooler, a recently constructed storage ring. experimental advantages of an electron-cooled proton beam were utilized. data cover energy range where only lowest possible angular momentum state contributes in exit channel. dependence is not compatible that predicted by models...
The proton and deuteron analyzing powers ten of the possible 12 spin correlation coefficients have been measured for $p+d$ elastic scattering at bombarding energies 135 200 MeV. results are compared with Faddeev calculations using two different $\mathit{NN}$ potentials. qualitative features extensive data set on dependence in over a wide range angles presented here remarkably well explained by two-nucleon force predictions without inclusion three-nucleon force. remaining discrepancies are,...
The differential cross sections and analyzing powers for 200 MeV protons elastically scattered from $^{12}\mathrm{C}$ $^{13}\mathrm{C}$ have been measured in the angular region 6-115\ifmmode^\circ\else\textdegree\fi{}. data were analyzed terms of a local, complex, spindependent optical potential. potentials defined phenomenologically (simple or double Woods-Saxon forms) derived impulse approximation Kerman-McManus-Thaler approach with without semiempirical correction Pauli blocking....
A cryogenic apparatus is described that enables a new experiment, nEDM@SNS, with major improvement in sensitivity compared to the existing limit search for neutron Electric Dipole Moment (EDM). This uses superfluid 4He produce high density of Ultra-Cold Neutrons (UCN) which are contained suitably coated pair measurement cells. The be operated at Spallation Neutron Source Oak Ridge National Laboratory, polarized 3He from an Atomic Beam injected into and transported cells where it serves as...
Recent calculations of s-wave pion production have severely underestimated the accurately known pp\ensuremath{\rightarrow}pp${\mathrm{\ensuremath{\pi}}}^{0}$ total cross section near threshold. In these calculations, only single-nucleon axial-charge operator is considered. We calculated, in addition to one-body term, two-body contributions this reaction that arise from exchange mesons. find inclusion scalar \ensuremath{\sigma}-meson current (and lesser ocntributions other mesons) increases...
Cross sections and analyzing powers are presented for $^{12}\mathrm{C}(\stackrel{\ensuremath{\rightarrow}}{p}, p)^{12}\mathrm{C}$ elastic scattering at 122 160 MeV. The data cover a large angular range (up to ${\ensuremath{\theta}}_{\mathrm{lab}}=154\ifmmode^\circ\else\textdegree\fi{}$) extend lower energies an earlier, similar measurement 200 complete set is analyzed in the framework of optical model. Besides standard Woods-Saxon potential, nonstandard radial shapes central spin-orbit...
Measurements of the total cross section differences ${\ensuremath{\sigma}}_{T}(^{48}\mathrm{Ca})\ensuremath{-}{\ensuremath{\sigma}}_{T}(^{40}\mathrm{Ca})$ and ${\ensuremath{\sigma}}_{T}(^{44}\mathrm{Ca})\ensuremath{-}{\ensuremath{\sigma}}_{T}(^{40}\mathrm{Ca})$ are reported for positive negative pions. Optical-model calculations used to extract values rms neutron radius difference each isotope pair. For $^{48}\mathrm{Ca}$-$^{40}\mathrm{Ca}$ deduced agrees with results recent...
In a kinematically complete experiment we have measured the two analyzing powers and five spin correlation coefficients of reaction $\stackrel{\ensuremath{\rightarrow}}{p}\stackrel{\ensuremath{\rightarrow}}{p}\ensuremath{\rightarrow}\mathrm{pp}{\ensuremath{\pi}}^{0}$ as function all parameters three-body final state for bombarding energies between 325 400 MeV. The data are in disagreement with theoretical predictions available at this time. Below MeV, fewer than dozen complex partial-wave...
Abstract We study the dependence of primordial nuclear abundances as a function electromagnetic fine-structure constant $$\alpha $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>α</mml:mi> </mml:math> , keeping all other fundamental constants fixed. update leading reaction rates, in particular contribution to neutron-proton mass difference pertinent $$\beta <mml:mi>β</mml:mi> -decays, and go beyond certain approximations made literature. In particular, we include...
Differential cross sections and analyzing powers for the $\stackrel{\ensuremath{\rightarrow}}{p}p\ensuremath{\rightarrow}d{\ensuremath{\pi}}^{+}$ reaction have been measured to within ${T}_{\ensuremath{\pi}}^{\mathrm{cm}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}85\mathrm{keV}$ of threshold. The $S$-wave strength is extracted found be $\ensuremath{\sim}13%$ larger than that determined from recent measurements $\mathrm{np}\ensuremath{\rightarrow}d{\ensuremath{\pi}}^{0}$. Both power...
We have measured the $\mathrm{pp}$ spin correlation coefficients ${A}_{\mathrm{xx}},$ ${A}_{\mathrm{yy}},$ ${A}_{\mathrm{xz}}$ and analyzing power ${A}_{y}$ at 250.0, 280.0, 294.4, 310.0, 350.0, 399.1, 448.9 MeV over laboratory angular range $3.5\ifmmode^\circ\else\textdegree\fi{}--43.5\ifmmode^\circ\else\textdegree\fi{}$ $({\ensuremath{\theta}}_{\mathrm{c}.\mathrm{m}.}=7\ifmmode^\circ\else\textdegree\fi{}--90\ifmmode^\circ\else\textdegree\fi{}).$ The statistical accuracy is approximately...
A polarized internal atomic hydrogen target and a stored, beam are used to measure the spin-dependent total cross section Delta_sigma_T/sigma_tot, as well polar integrals of spin correlation coefficient combination A_xx-A_yy, analyzing power A_y for pp-> pp pi0 at four bombarding energies between 325 400 MeV. This experiment is made possible by use cooled in storage ring. The polarization observables study contribution from individual partial waves.