Prohlížení Acta Polytechnica. 2013, vol. 53, Supplement dle názvu
Zobrazují se záznamy 38-57 z 68
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RADIOACTIVE UHECR ASTRONOMY: CORRELATING GAMMA ANISOTROPY AND NEUTRINO PEV EVENTS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)UHECR (Ultra High Energy Cosmic Rays) were expected to be protons, to fly straight and to suffer of a GZK (opacity on CMB radiation) cut off. AUGER did suggest on 2007 that such early UHECR anisotropy was compatible with ... -
RECENT DEVELOPMENTS IN ULTRA-HIGH ENERGY NEUTRINO ASTRONOMY
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)We outline the current situation in ultrahigh energy (UHE) cosmic ray physics, pointing out the remaining problems, in particular the puzzle concerning the origin of the primary radiation and the role of neutrino astronomy ... -
RESULTS FROM LHCF EXPERIMENT
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The LHCf experiment has taken data in 2009 and 2010 p–p collisions at LHC at √s = 0.9TeV and √s = 7TeV. In this paper the most up-to-date results on the inclusive photon spectra and the π0 spectra measured by LHCf are ... -
RESULTS FROM THE XENON100 EXPERIMENT
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The XENON program consists in operating and developing double-phase time projection chambers using liquid xenon as the target material. It aims to directly detect dark matter in the form of WIMPs via their elastic scattering ... -
RX-J0852−4622: THE NEAREST HISTORICAL SUPERNOVA REMNANT – AGAIN
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)RX-J0852−4622, a supernova remnant, is demonstrated to be closer than 500 pc, based on the measurements of the angular radius, the angular expansion rate and the TeV g-ray flux. This is a new method of limiting the distance ... -
SEARCH FOR DARK MATTER WITH GAMMA-RAYS: A REVIEW
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)Successfully launched in June 2008, the Fermi Gamma-ray Space Telescope, formerly named GLAST, has been observing the high-energy gamma-ray sky with unprecedented sensitivity inthe 20MeV ÷ 300 GeV energy range and electrons ... -
SEARCH FOR GRAVITATIONAL WAVES FROM SUPERNOVAE AND LONG GRBS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)We report on evidence for black hole spindown in the light curves of the BATSE catalogue of 1491 long GRBs by application of matched filtering. This observation points to a strong interaction of the black hole with surrounding ... -
STATUS OF THE CUORE EXPERIMENT
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The CUORE (Cryogenic Underground Observatory for Rare Events) experiment will search for neutrinoless double beta decay of 130Te, a rare nuclear process that, if observed, would demonstrate the Majorana nature of the ... -
STUDY OF THE TIME DEPENDENCE OF RADIOACTIVITY
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The activity of a 137Cs source was measured using a germanium detector installed deep underground in the Gran Sasso Laboratory. In total about 5100 energy spectra, one hour measuring time each, were collected and used to ... -
SUPERNOVA 1987A: CELEBRATING A SILVER JUBILEE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The story of the SN 1987A explosion is briefly reviewed. Although this supernova was somewhat peculiar, the study of SN 1987A has clarified quite a number of important aspects of the nature and the properties of supernovae, ... -
TeV GAMMA RAYS: OBSERVATIONS VERSUS EXPECTATIONS & THEORY
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The scope of this paper is to discuss two important questions relevant for TeV γ-ray astronomy; the pursuit to reveal the origin of cosmic rays in our galaxy, and the opacity of the universe in γ-rays. The origin of cosmic ... -
THE 2H(α, γ)6LI REACTION AT LUNA AND BIG BANG NUCLEOSYNTHETIS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The 2H(α, γ)6Li reaction is the leading process for the production of 6Li in standard Big Bang Nucleosynthesis. Recent observations of lithium abundance in metal-poor halo stars suggest that there might be a 6Li plateau, ... -
THE ASTRO-H MISSION
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)A review of the Astro-H mission is presented here on behalf of the Astro-H collaboration. The joint JAXA/NASA ASTRO-H mission is the sixth in a series of highly successful X-ray missions initiated by the Institute of Space ... -
THE AUGER ENGINEERING RADIO ARRAY
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The Auger Engineering Radio Array currently measures MHz radio emission from extensive air showers induced by high energy cosmic rays with 24 self-triggered radio detector stations. Its unique site, embedded into the ... -
THE DISCOVERY OF THE CHANDRASEKHAR MASS AND THE CHANDRASEKHAR-EDDINGTON CONTROVERSY
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The so called Chandrasekhar limiting mass is a a quantum mechanical relativistic effect. The discovery and establishment of the concept involved a major controversy between the young Chandrasekhar and the hilarious Eddington. ... -
THE FIRST CENTURY OF COSMIC RAYS, AN HISTORICAL OVERVIEW
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The 1912 balloon flights of Victor Hess and related activities in those years are reviewed. Subsequent research during the early 20th Century is noted, including the discovery of the positron, mesons, and air showers. The ... -
THE FIRST STARS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)Pop III stars are the key to the character of primeval galaxies, the first heavy elements, the onset of cosmological reionization, and the seeds of supermassive black holes. Unfortunately, in spite of their increasing ... -
THE GERDA EXPERIMENT: STATUS AND FUTURE PLANS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The GERDA experiment is searching for the neutrinoless double beta decay of 76Ge. An observation of the neutrinoless double beta decay will not only prove lepton number violation by two units, but also that the neutrino ... -
THE HISTORY OF THE S PROCESS AND ITS PRESENT STATE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)We review the history and the present status of the s-process and point to problems in need of clarification. In some cases it has to do with lack of experimental data and in other the theory is missing. -
THE IMPACT OF SUZAKU MEASUREMENTS ON ASTROPARTICLE PHYSICS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)Results from the Suzaku X-ray broad-band observations of clusters of galaxies are summarized. Aiming at understanding the physics of gas heating/particle acceleration and the cluster dynamical evolution, we search for ...