This paper reports on Monte Carlo simulation results for future measurements of the moduli of time-like proton electromagnetic form factors, |GE | and |GM|, using the ¯pp → μ+μ− reaction at PANDA (FAIR). The electromagnetic form factors are fundamental quantities parameterizing the electric and magnetic structure of hadrons. This work estimates the statistical and total accuracy with which the form factors can be measured at PANDA, using an analysis of simulated data within the PandaRoot software framework. The most crucial background channel is ¯pp → π+π−,due to the very similar behavior of muons and pions in the detector. The suppression factors are evaluated for this and all other relevant background channels at different values of antiproton beam momentum. The signal/background separation is based on a multivariate analysis, using the Boosted Decision Trees method. An expected background subtraction is included in this study, based on realistic angular distribuations of the background contribution. Systematic uncertainties are considered and the relative total uncertainties of the form factor measurements are presented.
Mapping cortical brain asymmetry in 17,141 healthy individuals worldwide via the ENIGMA Consortium
(2017)
Publikationen zur Reiseliteratur der Aufklärung haben einen neuen Aufschwung erhalten und auch zu Schopenhauer sind in den letzten Jahren wichtige Beiträge erschienen. Die meisten Abhandlungen verweisen allerdings nur recht kursiv auf Schopenhauers Reisebericht, während die einschlägige Forschung zur Reiseliteratur Schopenhauer gar nicht erwähnt oder sich mit abwertenden Klischees begnügt: Ihr Bericht sei sentenziös und vom 'common sense' der Kaufmannsfrau geprägt, er hebe vor allem bürgerliche Tugenden hervor. [...] Die vorliegende Untersuchung der Schopenhauerschen Reise wird versuchen, sich dem "Sehpunkt" der Autorin so genau wie möglich zu nähern. Sie wird ihre weitläufige Bildung, ihr Selbstbewusstsein und ihre Urbanität berücksichtigen.
The electron-capture process was studied for Xe54+ colliding with H2 molecules at the internal gas target of the Experimental Storage Ring (ESR) at GSI, Darmstadt. Cross-section values for electron capture into excited projectile states were deduced from the observed emission cross section of Lyman radiation, being emitted by the hydrogenlike ions subsequent to the capture of a target electron. The ion beam energy range was varied between 5.5 and 30.9 MeV/u by applying the deceleration mode of the ESR. Thus, electron-capture data were recorded at the intermediate and, in particular, the low-collision-energy regime, well below the beam energy necessary to produce bare xenon ions. The obtained data are found to be in reasonable qualitative agreement with theoretical approaches, while a commonly applied empirical formula significantly overestimates the experimental findings.