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CERN Document Server 9 záznamov nájdených  Hľadanie trvalo 0.61 sekúnd. 
1.
Differential measurement of trident production in strong electromagnetic fields / Nielsen, Christian F. (Aarhus U.) ; Holtzapple, Robert (Cal. Poly.) ; Lund, Mads M. (Aarhus U.) ; Surrow, Jeppe H. (Aarhus U.) ; Sørensen, Allan H. (Aarhus U.) ; Sørensen, Marc B. (Aarhus U.) ; Uggerhøj, Ulrik I. (Aarhus U.) /CERN NA63 Collaboration
In this paper, we present experimental results and numerical simulations of trident production, $e^-\rightarrow e^-e^+e^-$, in a strong electromagnetic field. The experiment was conducted at CERN for the purpose of probing the strong-field parameter $\chi$ up to 2.4, using a 200 GeV electron beam penetrating a 400 $\mu$m thick germanium crystal oriented along the $\langle 110\rangle$ axis. [...]
arXiv:2307.03464.- 2023-09-01 - 29 p. - Published in : Phys. Rev. D 108 (2023) 052013 Fulltext: Publication - PDF; 2307.03464 - PDF;
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2.
Precision Measurement of Trident Production in Strong Electromagnetic Fields / Nielsen, Christian F. (Aarhus U.) ; Holtzapple, Robert (Cal. Poly.) ; Lund, Mads M. (Aarhus U.) ; Surrow, Jeppe H. (Aarhus U.) ; Sørensen, Marc B. (Aarhus U.) ; Uggerhøj, Ulrik I. (Aarhus U.) /NA63 Collaboration
We demonstrate experimentally that the trident process $e^-\rightarrow e^-e^+e^-$ in a strong external field, with a spatial extension comparable to the effective radiation length, is well understood theoretically. The experiment, conducted at CERN, probes values for the strong field parameter $\chi$ up to 2.4. [...]
arXiv:2211.02390.- 2023-02-14 - 5 p. - Published in : Phys. Rev. Lett. 130 (2023) 071601 Fulltext: 2211.02390 - PDF; Publication - PDF;
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3.
Vacuum birefringence by Compton backscattering through a strong field / Wistisen, Tobias N (Aarhus U.) ; Uggerhøj, Ulrik I (Aarhus U.)
We propose a novel scheme to measure nonlinear effects in electrodynamics arising from QED corrections. Our theoretical starting point is the Heisenberg-Euler-Schwinger effective Lagrangian which predicts that a vacuum with a strong static electromagnetic field turns birefringent. [...]
2013 - 6 p. - Published in : Phys. Rev. D 88 (2013) 053009
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4.
Experimental evidence of quantum radiation reaction in aligned crystals / Wistisen, Tobias N. (Aarhus U.) ; Di Piazza, Antonino (Heidelberg, Max Planck Inst.) ; Knudsen, Helge V. (Aarhus U.) ; Uggerhøj, Ulrik I. (Aarhus U.)
Radiation reaction is the influence of the electromagnetic field emitted by a charged particle on the dynamics of the particle itself. Here we report experimental radiation emission spectra from ultrarelativistic positrons in silicon in a regime where both quantum and radiation-reaction effects dominate the dynamics of the positrons. [...]
arXiv:1704.01080.- 2018-02-23 - 14 p. - Published in : Nature Commun. 9 (2018) 795 Fulltext: arXiv:1704.01080 - PDF; s41467-018-03165-4 - PDF;
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5.
Bubble detector measurements of a mixed radiation field from antiproton annihilation / Bassler, Niels (Aarhus U. ; Aarhus U. Hospital) ; Knudsen, Helge (Aarhus U.) ; Møller, Søren Pape (Aarhus U., ISA) ; Petersen, Jørgen B. (Aarhus U. Hospital) ; Rahbek, Dennis (Aarhus U.) ; Uggerhøj, Ulrik I. (Aarhus U.) /AD-4/ACE collaboration
In the light of recent progress in the study of the biological potential of antiproton tumour treatment it is important to be able to characterize the neutron intensity arising from antiproton annihilation using simple, compact and reliable detectors. The intensity of fast neutrons from antiproton annihilation on polystyrene has been measured with bubble detectors and a multiplicity has been derived as well as an estimated neutron equivalent dose. [...]
2006 - 4 p. - Published in : Nucl. Instrum. Methods Phys. Res., B 251 (2006) 269–273
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6.
Biological effectiveness of antiproton annihilation / Holzscheiter, Michael H. (Pbar Medical, Newport Beach) ; Agazaryan, Nzhde (UCLA, Los Angeles (main)) ; Bassler, Niels (Aarhus U. (main)) ; Beyer, Gerd (Geneva, U. Medical Ctr.) ; De Marco, John J. (UCLA, Los Angeles (main)) ; Doser, Michael (CERN) ; Ichioka, Toshiyasu (Aarhus U. (main)) ; Iwamoto, Keisuke S. (UCLA, Los Angeles (main)) ; Knudsen, Helge V. (Aarhus U. (main)) ; Landua, Rolf (CERN) et al.
We describe an experiment designed to determine whether or not the densely ionizing particles emanating from the annihilation of antiprotons produce an increase in “biological dose” in the vicinity of the narrow Bragg peak for antiprotons compared to protons. This experiment is the first direct measurement of the biological effects of antiproton annihilation. [...]
2004 - Published in : Nucl. Instrum. Methods Phys. Res., B 221 (2004) 210-214
In : 12th International Workshop on Low Energy Positron and Positronium Physics, Sandbjerg, Denmark, 19 - 21 Jul 2003, pp.210-214
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7.
Investigation of classical radiation reaction with aligned crystals / Di Piazza, A. (Heidelberg, Max Planck Inst.) ; Wistisen, Tobias N. (Aarhus U.) ; Uggerhøj, Ulrik I. (Aarhus U.)
Classical radiation reaction is the effect of the electromagnetic field emitted by an accelerated electric charge on the motion of the charge itself. The self-consistent underlying classical equation of motion including radiation-reaction effects, the Landau-Lifshitz equation, has never been tested experimentally, in spite of the first theoretical treatments of radiation reaction having been developed more than a century ago. [...]
arXiv:1503.05717.- 2017-02-10 - 5 p. - Published in : Phys. Lett. B 765 (2017) 1-5 Article from SCOAP3: PDF; Fulltext: PDF; External link: Preprint
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8.
Direct measurement of the formation length of photons / Andersen, Kristoffer K (Aarhus U.) ; Andersen, Søren L (Aarhus U.) ; Esberg, Jakob (Aarhus U.) ; Knudsen, Helge (Aarhus U.) ; Mikkelsen, Rune (Aarhus U.) ; Uggerhøj, Ulrik I (Aarhus U.) ; Sona, Pietro (Florence U.) ; Mangiarotti, Alessio (Coimbra U.) ; Ketel, Tjeerd J (Vrije U., Amsterdam) ; Ballestrero, Sergio (Johannesburg U.) /CERN NA63 Collaboration
We report the first observation of a shoulder in the radiation spectrum from GeV electrons in a structured target consisting of two thin and closely spaced foils. The position of the shoulder depends on the target spacing and is directly connected to the finite formation length of a low-energy photon emitted by an ultrarelativistic electron. [...]
2012 - Published in : Phys. Rev. Lett. 108 (2012) 071802 APS published version, local copy: PDF;
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9.
Status report CRYSTAL / Uggerhøj, Ulrik (Department of Physics and Astronomy, University of Aarhus)
We describe the measurements planned to be performed at the CERN SPS H4 beam line, in October 2007. [...]
CERN-SPSC-2007-023 ; SPSC-SR-021. - 2007.
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