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83 papers · 1 filter
Are Coronae of Magnetically Active Stars Heated by Flares? III. Analytical Distribution of Superimposed Flares
K. Arzner, M. Guedel
(abridged) We study the hypothesis that observed X-ray/extreme ultraviolet emission from coronae of magnetically active stars is entirely (or to a large part) due to the superposit…
Flares from small to large: X-ray spectroscopy of Proxima Centauri with XMM-Newton
M. Guedel, M. Audard, F. Reale +2
(Abridged) We report results from a comprehensive study of the nearby M dwarf Proxima Centauri with the XMM-Newton satellite. We find strongly variable coronal X-ray emission, with…
Modeling an X-ray Flare on Proxima Centauri: evidence of two flaring loop components and of two heating mechanisms at work
F. Reale, M. Guedel, G. Peres +1
We model in detail a flare observed on Proxima Centauri with the EPIC-PN on board XMM-Newton at high statistics and high time resolution and coverage. Time-dependent hydrodynamic l…
Precise Measurement of the Pion Axial Form Factor in the Pi+ -> e+ nu gamma Decay
E. Frlez, D. Pocanic, V. A. Baranov +23
We have studied radiative pion decays Pi+ -> e+ nu gamma in three broad kinematic regions using the PIBETA detector and a stopped pion beam. Based on Dalitz distributions of 42,209…
Search for Colour Singlet and Colour Reconnection Effects in Hadronic Z Decays at LEP
L3 Collaboration
A search is performed in symmetric 3-jet hadronic Z decay events for evidence of colour singlet production or colour reconnection effects. Asymmetries in the angular separation of…
Design, Commissioning and Performance of the PIBETA Detector at PSI
E. Frlez, D. Pocanic, K. A. Assamagan +41
We describe the design, construction and performance of the PIBETA detector built for the precise measurement of the branching ratio of pion beta decay, pi+ -> pi0 e+ nu, at the Pa…