Search results for "Mott"
showing 10 items of 128 documents
The influence of the nuclear medium on inclusive electron and neutrino scattering off nuclei
2007
We present a model for inclusive electron and neutrino scattering off nuclei paying special attention to the influence of in-medium effects on the quasi-elastic scattering and pion-production mechanisms. Our results for electron scattering off Oxygen are compared to experimental data at beam energies ranging from 0.7-1.5 GeV. The good description of electron scattering serves as a benchmark for neutrino scattering.
�ber die Abh�ngigkeit des Polarisationsgrades vom Streuwinkel bei Mott-Streuung langsamer Elektronen
1965
The angular dependence of polarizationP(Θ) of electrons elastically scattered by a beam of mercury atoms is measured in a double scattering experiment for electron energies of 0,9; 1,2; and 1,5 keV. The results are compared with theory and found to be in good agreement. Maximum degree of polarization measured isP=0,53±0,10 (electron current 10−12A).
Proton-Hydrogen Charge Exchange and Elastic Scattering in the Faddeev Approach
2000
Results of the application of Faddeev-type integral equations to proton-hydrogen collisions are reported. The approach, realized in the impact parameter representation, incorporates the exact two-particle off-shell Coulomb T-matrices in all ‘triangle’ contributions to the effective potentials. Calculatedtotal and differential electron-transfer as well as differential elastic scattering cross sections show very good agreement with experiment, over a wide range of incident energies.
NUCLEAR MAGNETIC ORDER, USE OF SPIN DEPENDENT AMPLITUDES
1993
The use of the spin dependent part of the nuclear scattering length gives access to neutron scattering to the field of nuclear magnetism. This paper presents the theoretical and experimental background for such experiments. The available results on nuclear order will be reviewed and put if possible in the larger frame of many body physics. The possibilities of using nuclear magnetism for new applications or the improvement of scattering techniques will be stressed as well.
Scattering Matrix and Observables in Scattering and Decays
2013
As an interlude in the analysis of canonical field quantization, this section describes important concepts of scattering theory for Lorentz covariant quantum field theories that will be needed for the calculation of observables such as scattering cross sections and decay probabilities.
Defects, Disorder, and Strong Electron Correlations in Orbital Degenerate, Doped Mott Insulators.
2015
We elucidate the effects of defect disorder and $e$-$e$ interaction on the spectral density of the defect states emerging in the Mott-Hubbard gap of doped transition-metal oxides, such as Y$_{1-x}$Ca$_{x}$VO$_{3}$. A soft gap of kinetic origin develops in the defect band and survives defect disorder for $e$-$e$ interaction strengths comparable to the defect potential and hopping integral values above a doping dependent threshold, otherwise only a pseudogap persists. These two regimes naturally emerge in the statistical distribution of gaps among different defect realizations, which turns out to be of Weibull type. Its shape parameter $k$ determines the exponent of the power-law dependence o…
Routing quantum information in spin chains
2013
Two different models for performing efficiently routing of a quantum state are presented. Both cases involve an XX spin chain working as data bus and additional spins that play the role of sender and receivers, one of which is selected to be the target of the quantum state transmission protocol via a coherent quantum coupling mechanism making use of local/global magnetic fields. Quantum routing is achieved, in the first of the models considered, by weakly coupling the sender and the receiver to the data bus. In the second model, strong magnetic fields acting on additional spins located between the sender/receiver and the data bus allow us to perform high fidelity routing.
Prospective associations between alcohol use, binge drinking and sexual activity in older adults: The English Longitudinal Study of Ageing
2021
The present study aimed to investigate associations between alcohol consumption, including binge drinking, and sexual activity. Data were from 1,622 men and 2,195 women aged ≥50 years participating in the English Longitudinal Study of Ageing. Multivariable logistic regression was used to prospectively assess sex-specific associations between baseline frequency of alcohol use in the last year or binge drinking in the last week (self-reported in 2004/05) and sexual activity at 8-year follow-up (2012/13). Covariates included partner status, age, ethnicity, wealth, limiting long-standing illness, smoking status, physical activity, and depressive symptoms. After adjustment, regular alcohol consu…
«Ma qual necessità ci è di cantar questi mottettacci infelici?». Giuseppe Giordani e il mottetto tardo-settecentesco tra prassi e censure
2013
I mottetti costituiscono un comparto apparentemente dimesso e di fatto minore nel nutrito catalogo delle composizioni sacre di Giuseppe Giordani. E tuttavia la produzione del maestro partenopeo, proprio in quanto esempio medio e dignitosamente routinario, offre l’opportunità di condurre una prima ricognizione nella scrittura mottettistica della seconda metà del Settecento e di prendere dimestichezza con un repertorio finora trascurato e per molti aspetti misconosciuto
Un "cospiratore" federalista siciliano: Giuseppe Motta
2015
Il siciliano Giuseppe Motta (1902-1984), sebbene circoscritto all’ambito della storia locale, fu figura non priva di interesse se rapportata alla temperie ambientale in cui visse e al suo travaglio ideologico che lo portò, come Altiero Spinelli, dal marxismo al federalismo, tanto da auspicare la costituzione di un partito federalista che fosse artefice dell’unificazione politica europea. Nei suoi lavori, redatti tra il 1934 e il 1983, Motta difese tenacemente l’aggregazione federalista degli Stati europei nella convinzione che tale assetto avrebbe consentito alla Sicilia di collocarsi tra le regioni economicamente più sviluppate.