A5086116742- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Advanced NMR Techniques and Applications
- Advanced Chemical Physics Studies
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Quantum, superfluid, helium dynamics
- Radiation Detection and Scintillator Technologies
- Particle accelerators and beam dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Cultural Heritage Materials Analysis
- Particle Detector Development and Performance
- Rare-earth and actinide compounds
- Black Holes and Theoretical Physics
- Astronomical and nuclear sciences
- High-pressure geophysics and materials
- Pulsars and Gravitational Waves Research
- Atomic and Subatomic Physics Research
- X-ray Diffraction in Crystallography
- Geology and Paleoclimatology Research
- Computational Physics and Python Applications
Tel Aviv University
2008-2021
Johannes Gutenberg University Mainz
2019
Boğaziçi University
2015
Petersburg Nuclear Physics Institute
2001-2008
Campbell Collaboration
2003
University of British Columbia
1986-1996
TRIUMF
1984-1996
Kent State University
1991-1993
Massachusetts Institute of Technology
1993
Simon Fraser University
1993
We observe a signal for the doubly charmed baryon Xi(+)(cc) in charged decay mode Xi(+)(cc)-->Lambda(+)(c)K-pi(+) data from SELEX, charm hadroproduction experiment at Fermilab. an excess of 15.9 events over expected background 6.1+/-0.5 events, statistical significance 6.3sigma. The observed mass this state is 3519+/-1 MeV/c(2). Gaussian width 3 MeV/c(2), consistent with resolution; its lifetime less than 33 fs 90% confidence.
We measured the energies, widths, and cross sections of isovector monopole dipole resonances in various nuclei between $^{40}\mathrm{Ca}$ $^{208}\mathrm{Pb}$ with reactions (${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$,${\ensuremath{\pi}}^{0}$). Both exhaust approximately same substantial fraction section calculated a random-phase-approximation--distorted-wave-impulse-approximation model. The excitation energies widths are good agreement random-phase-approximation calculations for...
Recent data on particle-hole multiplets in ${\mathrm{Bi}}^{208}$ have been analyzed terms of the Racah multipole decomposition. The resulting coefficients are very similar for various multiplets. A comparison with other known ${\mathrm{Cl}}^{38}$, ${\mathrm{K}}^{30}$, ${\mathrm{Sc}}^{42}$, ${\mathrm{Sc}}^{48}$, ${\mathrm{Sc}}^{50}$, ${\mathrm{Nb}}^{92}$, and ${\mathrm{Bi}}^{210}$ also shows a remarkable similarity. These empirical results show that spectra such determined reasonably well by...
A common measure of association between two variables x and y is the bivariate Pearson correlation coefficient ρ(x,y) that characterizes strength direction any linear relationship y.This article describes how to determine optimal sample size for correlations, reviews available methods, discusses their different ranges applicability.A convenient equation derived help plan correlations by confidence interval analysis.In addition, a useful table planning studies provided gives sizes needed...
We report the first observation of a charm-strange meson D(+)(sJ)(2632) at mass 2632.5+/-1.7 MeV/c(2) in data from SELEX, charm hadro-production experiment E781 Fermilab. This state is seen two decay modes, D(+)(s)eta and D0K+. In mode we observe peak with 101 events over combinatoric background 54.9 2635.4+/-3.3 MeV/c(2). There corresponding 21 6.9 2631.5+/-2.0 The width this <17 90% confidence level. relative branching ratio Gamma(D0K+)/Gamma(D(+)(s)eta) 0.14+/-0.06. mechanism that keeps...
Pion absorption in $^{3}\mathrm{He}$ was studied at ${T}_{\ensuremath{\pi}}$=62.5 and 82.8 MeV using nucleon-nucleon coincidences. For ${\ensuremath{\pi}}^{+}$ on proton-neutron pairs the differential cross section is same as that for ${\ensuremath{\pi}}^{+}$+d\ensuremath{\rightarrow}p+p except an increase by a factor of about 1.5. ${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$ proton-proton pair, asymmetric 90\ifmmode^\circ\else\textdegree\fi{}, indicating possible isospin mixing. The total...
We present measured angular distributions for ${\ensuremath{\pi}}^{+}$-elastic scattering at 30 and 50 MeV from selected targets with $A=12 \mathrm{to} 208$. These were analyzed using a phenomenological optical potential of first-order form. The mass dependence the strength parameters displays isospin expected free $\ensuremath{\pi}N$ interaction.NUCLEAR REACTIONS Elastic ${\ensuremath{\pi}}^{+}$ $^{12}\mathrm{C}$, $^{16}\mathrm{O}$, $^{40}\mathrm{Ca}$, $^{90}\mathrm{Zr}$,...
Observation of the $T+1$ component isovector monopole and giant dipole resonances in reactions $^{90}\mathrm{Zr}$ $^{120}\mathrm{Sn}({\ensuremath{\pi}}^{\ensuremath{-}}, {\ensuremath{\pi}}^{0})$ at ${T}_{{\ensuremath{\pi}}^{\ensuremath{-}}}=165$ MeV is reported. The isobaric analog state $T\ensuremath{-}1$ resonance reaction $^{120}\mathrm{Sn}({\ensuremath{\pi}}^{+}, were also observed. Excitation energies widths are given.
The cross sections for the reaction (${\ensuremath{\pi}}^{+}, {\ensuremath{\pi}}^{0}$) on $^{7}\mathrm{Li}$, $^{10}\mathrm{B}$, and $^{13}\mathrm{C}$ were measured over energy range of 70 to 250 MeV by activation methods. excitation functions found be flat with about 2.5 mb 0.4 1.0 $^{13}\mathrm{C}$.
A measurement of the ${\mathit{K}}^{+}$ total cross sections on carbon and deuterium their ratios from 450 to 740 MeV/c has been carried out at Brookhaven Alternating Gradient Synchrotron. The observed depart significantly those expected conventional nuclear physics calculations. data are compared models nucleon ``swelling,'' which ascribe effect quark deconfinement or, alternatively, vector-meson exchange with density-dependent masses.
Gamow-Teller (GT) strength has been extracted from cross sections for the reaction $^{54}\mathrm{Fe}$(n,p${)\mathrm{}}^{54}$Mn at 0\ifmmode^\circ\else\textdegree\fi{}, 2.5\ifmmode^\circ\else\textdegree\fi{}, 5\ifmmode^\circ\else\textdegree\fi{}, 8\ifmmode^\circ\else\textdegree\fi{}, and 12\ifmmode^\circ\else\textdegree\fi{}, an incident energy of 298 MeV. This determination ${\ensuremath{\beta}}^{+}$ GT ${S}_{+}$ allows first time a full test Ikeda sum rule. These data also show that best...
Angular distributions of differential cross sections were measured for the first time pion absorption on a $T=1$, $S=0$ nucleon pair and $T=0$, $S=1$ in $^{3}\mathrm{He}$ nucleus. A large isospin dependence is observed sections. The ratio $\frac{\ensuremath{\sigma}(^{3}\mathrm{He}({\ensuremath{\pi}}^{+},2p))}{\ensuremath{\sigma}(^{3}\mathrm{He}({\ensuremath{\pi}}^{\ensuremath{-}},pn))}$ 15.2\ifmmode\pm\else\textpm\fi{}1.2. results show evidence an isoscalar component final state reaction...
Differential cross sections for elastic scattering of 40 MeV positive pions from $^{12}\mathrm{C}$, $^{16}\mathrm{O}$, $^{40}\mathrm{Ca}$, $^{90}\mathrm{Zr}$, and $^{208}\mathrm{Pb}$ were measured at 18 angles in the angular range 25\ifmmode^\circ\else\textdegree\fi{}-160\ifmmode^\circ\else\textdegree\fi{}. Relative uncertainties 2.5% to 7% overall normalization 4% obtained. An optical potential fit data indicates that while magnitudes strength parameters, except $\mathrm{Re}{b}_{1}$, are...
We present the energies, widths, and cross sections of isovector monopole resonance in nuclei between $^{40}\mathrm{Ca}$ $^{208}\mathrm{Pb}$ excited by (${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$, ${\ensuremath{\pi}}^{0}$) reactions. also give results for giant dipole resonance. Both resonances exhaust same substantial fraction section calculated a random-phase, distorted-wave impulse-approximation model. No quadrupole was observed.
Isobaric-analog-state transitions have been observed throughout the periodic table in (${\ensuremath{\pi}}^{+}$,${\ensuremath{\pi}}^{0}$) reaction. The forward-angle differential cross sections at ${T}_{\ensuremath{\pi}}=98$ MeV on targets of C${\mathrm{H}}_{2}$, $^{7}\mathrm{Li}$, $^{13}\mathrm{C}$, $^{27}\mathrm{Al}$, $^{58}\mathrm{Ni}$, $^{90}\mathrm{Zr}$, $^{120}\mathrm{Sn}$, and $^{208}\mathrm{Pb}$ are reported. $A$ dependence follows $(N\ensuremath{-}Z){A}^{\ensuremath{-}\frac{4}{3}}$,...
The total cross sections for ${\mathit{K}}^{+}$ mesons on carbon and deuterium nuclei have been measured at eleven momenta in the range 450--740 MeV/c. experimental technique was of standard transmission type. meson is least strongly interacting available hadronic probes, with a long mean free path nuclear matter. At low incident momentum ${\mathit{K}}^{+}$N interaction dominated by ${\mathit{S}}_{11}$ phase shift varies slowly energy. These characteristics make an ideal tool probing volume...