29,036 research outputs found
Abrupt Rise of the Longitudinal Recoil Ion Momentum Distribution for Ionizing Collisions
We report on the experimental observation of an abrupt rise in the longitudinal momentum distribution of recoil ions created in proton helium collision. The details of this structure can be related to electrons traveling with the velocity of the projectile [electron capture to the continuum (ECC)]. The longitudinal as well as the transverse distribution of the recoil ions can be explained as a continuation of the momentum distribution from ions resulting from electron capture illustrating the smooth transition from the capture to bound states of the projectile to the ECC.Fil: Weber, Th.. Institut fĂŒr Kernphysik; AlemaniaFil: Khayyat, Kh.. Institut fĂŒr Kernphysik; AlemaniaFil: Dörner, R.. UniversitĂ€t Freiburg; AlemaniaFil: RodrĂguez Chariarse, Vladimir Daniel. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Ciudad Universitaria. Instituto de FĂsica de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de FĂsica de Buenos Aires; ArgentinaFil: Mergel, V.. Institut fĂŒr Kernphysik; AlemaniaFil: Jagutzk, O.. Institut fĂŒr Kernphysik; AlemaniaFil: Schmidt, L.. Institut fĂŒr Kernphysik,; AlemaniaFil: MĂŒller, K. A.. Institut fĂŒr Kernphysik; AlemaniaFil: Afaneh, F.. Institut fĂŒr Kernphysik; AlemaniaFil: Gonzalez, A.. ComisiĂłn Nacional de EnergĂa AtĂłmica. Centro AtĂłmico Bariloche; ArgentinaFil: Schmidt-Böcking, H.. Institut fĂŒr Kernphysik; Alemani
Qualification Tests of 474 Photomultiplier Tubes for the Inner Detector of the Double Chooz Experiment
The hemispherical 10" photomultiplier tube (PMT) R7081 from Hamamatsu
Photonics K.K. (HPK) is used in various experiments in particle and
astroparticle physics. We describe the test and calibration of 474 PMTs for the
reactor antineutrino experiment Double Chooz. The unique test setup at
Max-Planck-Institut f\"ur Kernphysik Heidelberg (MPIK) allows one to calibrate
30 PMTs simultaneously and to characterize the single photo electron response,
transit time spread, linear behaviour and saturation effects, photon detection
efficiency and high voltage calibration
Qualification Tests of 474 Photomultiplier Tubes for the Inner Detector of the Double Chooz Experiment
The hemispherical 10" photomultiplier tube (PMT) R7081 from Hamamatsu
Photonics K.K. (HPK) is used in various experiments in particle and
astroparticle physics. We describe the test and calibration of 474 PMTs for the
reactor antineutrino experiment Double Chooz. The unique test setup at
Max-Planck-Institut f\"ur Kernphysik Heidelberg (MPIK) allows one to calibrate
30 PMTs simultaneously and to characterize the single photo electron response,
transit time spread, linear behaviour and saturation effects, photon detection
efficiency and high voltage calibration
Qualification Tests of 474 Photomultiplier Tubes for the Inner Detector of the Double Chooz Experiment
The hemispherical 10" photomultiplier tube (PMT) R7081 from Hamamatsu
Photonics K.K. (HPK) is used in various experiments in particle and
astroparticle physics. We describe the test and calibration of 474 PMTs for the
reactor antineutrino experiment Double Chooz. The unique test setup at
Max-Planck-Institut f\"ur Kernphysik Heidelberg (MPIK) allows one to calibrate
30 PMTs simultaneously and to characterize the single photo electron response,
transit time spread, linear behaviour and saturation effects, photon detection
efficiency and high voltage calibration
Discovery of very high energy Îł-ray emission from the BL Lacertae object PKS 0301-243 with H.E.S.S.
The active galactic nucleus PKSâ0301â243 (z = 0.266) is a high-synchrotron-peaked BLâLac object that is detected at high energies (HE, 100 MeV 100 GeV) by the High Energy Stereoscopic System (H.E.S.S.) from observations between September 2009 and December 2011 for a total live time of 34.9 h. Gamma rays above 200âGeV are detected at a significance of 9.4Ï. A hint of variability at the 2.5Ï level is found. An integral flux I(E > 200âGeV) = (3.3 ± 1.1stat ± 0.7syst) Ă 10-12âphâcm-2âs-1 and a photon index Î = 4.6 ± 0.7stat ± 0.2syst are measured. Multi-wavelength light curves in HE, X-ray and optical bands show strong variability, and a minimal variability timescale of eight days is estimated from the optical light curve. A single-zone leptonic synchrotron self-Compton scenario satisfactorily reproduces the multi-wavelength data. In this model, the emitting region is out of equipartition and the jet is particle dominated. Because of its high redshift compared to other sources observed at TeV energies, the very high energy emission from PKSâ0301â243 is attenuated by the extragalactic background light (EBL) and the measured spectrum is used to derive an upper limit on the opacity of the EBL.Fil: Abramowski, A.. Universitat Hamburg; AlemaniaFil: Acero, F.. Universite Montpellier II; FranciaFil: Aharonian, F.. Max Planck Institut fĂŒr Kernphysik; AlemaniaFil: Benkhali, F. Ait. Max Planck Institut fĂŒr Kernphysik; AlemaniaFil: Akhperjanian, A. G.. National Academy of Sciences of the Republic of Armenia; ArmeniaFil: Medina, Maria Clementina. Provincia de Buenos Aires. GobernaciĂłn. Comision de Investigaciones CientĂficas. Instituto Argentino de RadioastronomĂa. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - La Plata. Instituto Argentino de Radioastronomia; ArgentinaFil: Valerius, K.. UniversitĂ€t Erlangen NĂŒrnberg; AlemaniaFil: van Eldik, C.. UniversitĂ€t Erlangen NĂŒrnberg; AlemaniaFil: Vasileiadis, G.. Universite Montpellier II; FranciaFil: Venter, C.. North West University; SudĂĄfricaFil: Viana, A.. Max Planck Institut fĂŒr Kernphysik; AlemaniaFil: Vincent, P.. UniversitĂ© Paris Diderot - Paris 7; FranciaFil: Völk, H. J.. Max Planck Institut fĂŒr Kernphysik; AlemaniaFil: Volpe, F.. Max Planck Institut fĂŒr Kernphysik; AlemaniaFil: Vorster, M.. North West University; SudĂĄfricaFil: Wagner, S. J.. UniversitĂ€t Heidelberg; AlemaniaFil: Wagner, P.. Humboldt UniversitĂ€t zu Berlin; AlemaniaFil: Ward, M.. University Of Durham; Reino UnidoFil: Weidinger, M.. Ruhr-universitĂ€t Bochum; AlemaniaFil: Weitzel, Q.. Max Planck Institut fĂŒr Kernphysik; AlemaniaFil: White, R.. The University of Leicester; Reino UnidoFil: Wierzcholska, A.. Uniwersytet Jagiellonski; PoloniaFil: Willmann, P.. UniversitĂ€t Erlangen NĂŒrnberg; AlemaniaFil: Wörnlein, A.. UniversitĂ€t Erlangen NĂŒrnberg; AlemaniaFil: Wouters, D.. CEA Saclay; FranciaFil: Zacharias, M.. Ruhr-universitĂ€t Bochum; AlemaniaFil: Zajczyk, A.. Universite Montpellier II; FranciaFil: Zdziarski, A. A.. Nicolaus Copernicus Astronomical Center; PoloniaFil: Zech, A.. UniversitĂ© Paris Diderot - Paris 7; FranciaFil: Zechlin, H. S.. Universitat Hamburg; Alemani
Initiation à une expérience de diffusion d'électrons : la diffusion Compton virtuelle
Stage Janus 05 A1-Collaboration, Institut fĂŒr Kernphysik, UniversitĂ€t Mainz, D-55099 Mainz, German
Lifetime determination of excited states in Cd-106
Two separate experiments using the Differential Decay Curve Method have been performed to extract mean lifetimes of excited states in 106 Cd. The inedium-spin states of interest were populated by the Mo-98(C-12, 4n) Cd-106 reaction performed at the Wright Nuclear Structure Lab., Yale University. From this experiment, two isomeric state mean lifetimes have been deduced. The low-lying states were populated by the Mo-96(C-13, 3n)Cd-106 reaction performed at the Institut fur Kernphysik, Universitat zu Koln. The mean lifetime of the I-pi = 2(1)(+) state was deduced, tentatively, as 16.4(9) ps. This value differs from the previously accepted literature value from Coulomb excitation of 10.43(9) ps
QCD Physics Potential of CMS
In view of the approaching LHC operation the feasibility and accuracy of QCD
measurements with the CMS experiment at the Large Hadron Collider (LHC)
involving hadrons and jets are discussed. This summary is based on analyses
performed at CMS for center-of-mass energies of 10 as well as 14 TeV assuming
event numbers ranging from some days of data taking up to 100/pb of integrated
luminosity with proton-proton collisions.Comment: Institut fuer Experimentelle Kernphysik, University of Karlsruhe,
Germany. On behalf of the CMS Collaboration, in proceedings of "1st IPM
Meeting on LHC Physics, Isfahan, Iran, 20.-24. April 2009". 10 pages, 16
figure
Electromagnetic radiation initiated by hadronic jets from microquasars in the ISM
Microquasars are potential candidates to produce a non-negligible fraction of
the observed galactic cosmic rays. The protons accelerated at the jet
termination shock interact with the interstellar medium and may produce
detectable fluxes of extended emission at different energy bands: high-energy
and very high-energy gamma-rays produced by neutral pion-decay, synchrotron and
bremsstrahlung emission in a wide energy range generated by the secondary
electrons produced by charged pion-decay. We discuss the association between
this scenario and some of the unidentified EGRET sources in the galactic plane.Comment: (1)Universitat de Barcelona (2)Max Planck institute fur kernphysik,
11 pages, 14 figures, accepted for publication in Astronomy & Astrophysic
- âŠ