J. Morgenstern
A5087351123- Nuclear physics research studies
- Nuclear Physics and Applications
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear reactor physics and engineering
- Optical Coherence Tomography Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Ear Surgery and Otitis Media
- Atomic and Subatomic Physics Research
- Photoacoustic and Ultrasonic Imaging
- Atomic and Molecular Physics
- Advanced NMR Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Quantum, superfluid, helium dynamics
- Advanced Chemical Physics Studies
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Nasal Surgery and Airway Studies
- Superconducting Materials and Applications
- Scientific Research and Discoveries
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Crystallography and Radiation Phenomena
TU Dresden
2017-2024
University Hospital Carl Gustav Carus
2018-2024
Klinik und Poliklinik für Hals-, Nasen-, Ohrenheilkunde
2019-2024
Else Kröner-Fresenius-Stiftung
2023
Klinik und Poliklinik für Psychotherapie und Psychosomatik
2018-2019
Direction des énergies
1993-2003
CEA Paris-Saclay
1979-2003
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
1968-2003
Stanford Synchrotron Radiation Lightsource
1995-1999
SLAC National Accelerator Laboratory
1995-1999
The spin structure function of the neutron gn1 has been determined over range 0.03<x<0.6 at an average Q2 2 (GeV/c)2 by measuring asymmetry in deep inelastic scattering polarized electrons from a 3He target energies between 19 and 26 GeV. integral is found to be F10gn1(x)dx=-0.022±0.011. Earlier reported proton results together with Bjorken sum rule predict F10gn1(x)dx=-0.059±0.019.Received 1 April 1993DOI:https://doi.org/10.1103/PhysRevLett.71.959©1993 American Physical Society
Measurements are reported of the proton and deuteron spin structure functions ${g}_{1}^{p}$ ${g}_{1}^{d}$ at beam energies 29.1, 16.2, 9.7 GeV, ${g}_{2}^{p}$ ${g}_{2}^{d}$ a energy 29.1 GeV. The integrals ${\ensuremath{\Gamma}}_{p}={\ensuremath{\int}}_{0}^{1}{g}_{1}^{p}{(x,Q}^{2})dx$ ${\ensuremath{\Gamma}}_{d}={\ensuremath{\int}}_{0}^{1}{g}_{1}^{d}{(x,Q}^{2})dx$ were evaluated fixed ${Q}^{2}=3(\mathrm{GeV}{/c)}^{2}$ using full data set to yield...
We have measured the ratio $\frac{{g}_{1}^{p}}{{F}_{1}^{p}}$ over range $0.029<x<0.8$ and $1.3<{Q}^{2}<10$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$ using deep-inelastic scattering of polarized electrons from ammonia. An evaluation integral $\ensuremath{\int}{0}^{1}{g}_{1}^{p}(x, {Q}^{2})\mathrm{dx}$ at fixed ${Q}^{2}=3$ yields 0.127\ifmmode\pm\else\textpm\fi{}0.004(stat)\ifmmode\pm\else\textpm\fi{}0.010(syst), in agreement with previous experiments, but well below Ellis-Jaffe sum...
Deep-inelastic electron scattering from $^{40}\mathrm{Ca}$, $^{48}\mathrm{Ca}$, and $^{56}\mathrm{Fe}$ has been measured at 60\ifmmode^\circ\else\textdegree\fi{}, 90\ifmmode^\circ\else\textdegree\fi{}, 140\ifmmode^\circ\else\textdegree\fi{} inelasticities up to including the $\ensuremath{\Delta}(3,3)$ region. Longitudinal response functions in momentum interval $300 \mathrm{MeV}/c<|\stackrel{\ensuremath{\rightarrow}}{\mathrm{q}}|<600 \mathrm{MeV}/c$ were extracted. The experimental Coulomb...
The neutron longitudinal and transverse asymmetries A1n A2n have been extracted from deep inelastic scattering of polarized electrons by a He3 target at incident energies 19.42, 22.66, 25.51 GeV. measurement allows for the determination spin structure functions g1n(x, Q2) g2n(x, over range 0.03<x<0.6 an average Q2 2 (GeV/c)2. data are used evaluation Ellis-Jaffe Bjorken sum rules. function is small negative within our measurement, yielding integral ∫0.030.6g1n(x)dx=−0.028±0.006 (stat)±0.006...
We report on a high-statistics measurement of the deuteron spin structure function ${g}_{1}^{d}$ at beam energy 29 GeV in kinematic range $0.029<x<0.8$ and $1<{Q}^{2}<10$ (GeV $/c$${)}^{2}$. The integral ${\ensuremath{\gamma}}_{1}^{d}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{\int}{1}^{}{g}_{1}^{d}\mathrm{dx}$ evaluated fixed ${Q}^{2}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}3$ $/c$${)}^{2}$ gives...
Deep-inelastic inclusive electron-scattering cross sections from $^{40}\mathrm{Ca}$, $^{48}\mathrm{Ca}$, and $^{56}\mathrm{Fe}$ have been measured at 60\ifmmode^\circ\else\textdegree\fi{}, 90\ifmmode^\circ\else\textdegree\fi{}, 140\ifmmode^\circ\else\textdegree\fi{} energy transfers including the $\ensuremath{\Delta}(3, 3)$ region. The transverse response function in momentum interval 300 MeV/c |q| 600 was extracted by Rosenbluth prescription. Different theoretical approaches to quasielastic...
We have measured proton and deuteron virtual photon-nucleon asymmetries ${A}_{2}^{p}$ ${A}_{2}^{d}$ structure functions ${g}_{2}^{p}$ ${g}_{2}^{d}$ over the range $0.03<x<0.8$ $1.3<{Q}^{2}<10(\mathrm{GeV}/c{)}^{2}$ by inelastically scattering polarized electrons off ammonia targets. Results for ${A}_{2}$ are significantly smaller than positivity limit $\sqrt{R}$ both Within experimental precision ${g}_{2}$ data well described twist-2 contribution, ${g}_{2}^{\mathrm{WW}}$. Twist-3 matrix...
Inclusive electron-scattering measurements of \ensuremath{\Delta} electroexcitation in nuclei are reported. Electrons with energies 0.96, 1.1, 1.3, and 1.5 GeV were scattered from $^{1}\mathrm{H}$, $^{4}\mathrm{He}$, C Fe, W at 37.5\ifmmode^\circ\else\textdegree\fi{}, corresponding to ${Q}^{2}$=0.20--0.52 (GeV/c${)}^{2}$ the peak. The centroid \ensuremath{\Delta}-region cross-section peak is above that for free nucleon it shifts higher invariant mass as ${Q}^{2}$ increases. A dependence dip...
The proton momentum distribution of $^{3}\mathrm{He}$ has been determined up to momenta 310 MeV/c by use the reaction $^{3}\mathrm{He}(e, {e}^{\ensuremath{'}}p)$. experimental missing-energy resolution, $\ensuremath{\delta}{E}_{m}=1.2$ MeV, was sufficient separate two- and three-body breakup channels. Results for disintegration have obtained values 80 MeV. resulting spectral function is compared predictions Faddeev variational calculations.
Electron-scattering cross sections for the reaction $^{3}\mathrm{He}$(e,e'p) have been measured recoil momenta between 300 and 600 MeV/c missing energies up to 90 MeV. Proton momentum distributions in $^{3}\mathrm{He}$, corrected final-state--interaction meson-exchange effects, obtained from 318 pd channel 290 515 ppn channel. Explicit evidence nucleon-nucleon correlations is presented.
The ratio g1F1 has been measured over the range 0.03 < x 0.6 and 0.3 Q2 10 (GeV/c)2 using deep-inelastic scattering of polarized electrons from protons deuterons. We find to be consistent with no Q2-dependence at fixed in region > 1 (GeV/c)2. A trend is observed for decrease lower Q2. Fits world data without a possible are agreement Bjorken sum rule, but Δq substantially less than quark-parton model expectation.
Longitudinal and transverse structure functions for the quasielastic reaction $^{40}\mathrm{Ca}$(e,e'p${)}^{39}$${\mathrm{K}}^{\mathrm{*}}$ have been obtained. Their q dependences appear like those free nucleons. However, ratio of longitudinal to is found reduced by 30% relative theoretical calculations.
We have measured the proton and deuteron spin structure functions g_1^p g_1^d in region of nucleon resonances for W^2 < 5 GeV^2 $Q^2\simeq 0.5$ 1.2$ by inelastically scattering 9.7 GeV polarized electrons off $^{15}NH_3$ $^{15}ND_3$ targets. observe significant resonance region. used present results, together with deep-inelastic data at higher W^2, to extract $\Gamma(Q^2)\equiv\int_0^1 g_1(x,Q^2) dx$. This is first information on low-Q^2 evolution Gamma toward Gerasimov-Drell-Hearn limit Q^2 = 0.