D. Počanić
A5103199870- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Atomic and Subatomic Physics Research
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Nuclear physics research studies
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Atomic and Molecular Physics
- Superconducting Materials and Applications
- Astronomical and nuclear sciences
- Advanced NMR Techniques and Applications
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Advanced Chemical Physics Studies
- Radioactive Decay and Measurement Techniques
- Scientific Research and Discoveries
- Analytical Chemistry and Chromatography
- Nuclear reactor physics and engineering
- Molecular spectroscopy and chirality
- Particle Accelerators and Free-Electron Lasers
- Astrophysics and Cosmic Phenomena
University of Virginia
2012-2023
University of Washington
2015-2019
McCormick (United States)
2001-2017
Virginia Tech
2016
PEN American Center
2015
National Centre for Nuclear Research
2009
Tbilisi State University
2009
Joint Institute for Nuclear Research
2009
University of Zurich
2009
Rudjer Boskovic Institute
1979-2009
Using a large acceptance calorimeter and stopped pion beam we have made precise measurement of the rare ${\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{e}^{+}\ensuremath{\nu}$ (${\ensuremath{\pi}}_{\ensuremath{\beta}}$) decay branching ratio. We evaluated ratio by normalizing number observed ${\ensuremath{\pi}}_{\ensuremath{\beta}}$ decays to ${\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{e}^{+}\ensuremath{\nu}$ (${\ensuremath{\pi}}_{e2}$) decays. find value...
We have measured the pi+-->e+ nugamma branching ratio over a wide region of phase space, based on total 65 460 events acquired using PIBETA detector. Minimum-chi2 fits to (E(e+), E(gamma) energy distributions result in weak form factor value F(A)=0.0119(1) with fixed F(V)=0.0259. An unconstrained fit yields F(V)=0.0258(17) and F(A)=0.0117(17). In addition, we a=0.10(6) for dependence F(V) q2, e+ nu pair invariant mass squared, parametrized as F(V)(q2)=F(V)(0)(1+aq(2)). The kinematic...
We have developed a custom amplifier board coupled to large-format 16-channel Hamamatsu silicon photomultiplier device for use as the light sensor electromagnetic calorimeters in Muon g-2 experiment at Fermilab. The calorimeter absorber is an array of lead-fluoride crystals, which produces short-duration Cherenkov light. detector sits high magnetic field muon storage ring. SiPMs selected, and their accompanying electronics, must preserve short pulse shape, quantum efficiency, be...
The existing experimental evidence for resonances in heavy-ion reactions is interpreted a unified way, based on the molecular resonance-window concept. Predictions are given nuclear systems most likely to exhibit resonances.
We have studied radiative pion decays pi(+)-->e(+)nugamma in three broad kinematic regions using the PIBETA detector and a stopped beam. Based on Dalitz distributions of 41 601 events we evaluated absolute pi-->enugamma branching ratios regions. Minimum chi(2) fits to integral differential (E(e(+)),E(gamma)) result axial-to-vector weak form factor ratio gamma identical with F(A)/F(V)=0.443(15), or F(A)=0.0115(4) F(V)=0.0259. However, deviations from standard model predictions...
Precision measurements in free neutron beta decay serve to determine the coupling constants of decay, and offer several stringent tests Standard Model.This paper describes program planned for Fundamental Physics Beamline at Spallation Neutron Source Oak Ridge National Laboratory, puts it into context other recent observables.
Neutron beta decay is one of the most fundamental processes in nuclear physics and provides sensitive means to uncover details weak interaction. can evaluate ratio axial-vector vector coupling constants standard model, λ = g A / V , through multiple correlations. The Nab experiment will carry out measurements electron-neutrino correlation parameter a with precision δ 10 −3 Fierz interference term b 3 × unpolarized free neutron decay. These results, along more precise measurement lifetime,...
We have extracted QCD matrix elements from our data on doubly polarized inelastic scattering of electrons nuclei.We find the higher twist element d2, which arises strictly quarkgluon interactions, to be unambiguously non zero.The also reveal an isospin dependence effects if we assume that Burkhardt-Cottingham Sum rule is valid.The fundamental Bjorken sum obtained a0 satisfied at low momentum transfer.
The Spin Asymmetries of the Nucleon Experiment measured two double spin asymmetries using a polarized proton target and electron beam at energies, 4.7 5.9 GeV. A large-acceptance open-configuration detector package identified scattered electrons 40\ifmmode^\circ\else\textdegree\fi{} covered wide range in Bjorken $x$ ($0.3<x<0.8$). Proportional to an average color Lorentz force, twist-3 matrix element, ${\stackrel{\texttildelow{}}{d}}_{2}^{p}$, was extracted from ${Q}^{2}$ values ranging 2.0...
The ratio of the electric and magnetic form factor proton, $\mu_p G_E^p/G_M^p$, has been measured for elastic electron-proton scattering with polarized beam target up to four-momentum transfer squared, $Q^2=5.66$ (GeV/c)$^2$ using double spin asymmetry orientation aligned nearly perpendicular momentum direction. This measurement G_E^p/G_M^p$ agrees $Q^2$ dependence previous recoil polarization data reconfirms discrepancy at high between Rosenbluth polarization-transfer method a different...
Precision measurements in neutron beta decay serve to determine the coupling constants of and allow for several stringent tests standard model. This paper discusses design expected performance Nab spectrometer.
Simple dynamics, few available decay channels, and highly controlled radiative loop corrections, make pion muon decays a sensitive means of exploring details the underlying symmetries. We review current status rare decays: π + → e ν (π e2 ), νγ e2γ 0 e3 [Formula: see text]. For latter we report new preliminary values for branching ratio B(E γ > 10 MeV , θ eγ 30°) = 4.365 (9) stat (42) syst × -3 parameter text], both in excellent agreement with standard model predictions. recent...
The combination of simple dynamics, small number available decay channels, and extremely well controlled radiative loop corrections, make charged pion decays a sensitive means for testing the underlying symmetries universality weak fermion couplings, as improving our understanding structure chiral dynamics. This paper reviews current state experimental study allowed rare pions: (a) leptonic, , or πe2, (b) radiative, πe2ee, (c) semileptonic, πe3. Taken together, combined data set presents an...
A semiempirical prediction of the occurrence resonances in heavy-ion reactions, based on an estimate spreading width via level-density calculations, is attempted. The calculations are applied to reactions leading composite nuclei s-d-shell region (24<or=A<or=32). results agree well with existing experimental data and yield predictions hitherto unobserved regions resonances.