Exploració per tema "Astrophysics"

Ara es mostren els items 1-20 de 95

  • 7Be(n,alpha) and 7Be(n,p) cross-section measurement for the cosmological lithium problem at the n TOF facility at CERN 

    Barbagallo, Massimo; Colonna, Nicola; Aberle, O.; Calviño Tavares, Francisco; Casanovas Hoste, Adrià; Cortés Rossell, Guillem Pere; Tarifeño Saldivia, Ariel Esteban (EDP Sciences, 2016)
    Comunicació de congrés
    Accés obert
    The Cosmological Lithium Problem refers to the large discrepancy between the abundance of primordial 7Li predicted by the standard theory of Big Bang Nucleosynthesis and the value inferred from the so-called “Spite plateau” ...

  • A GEANT4 Simulation-based study of CIRBE mission 

    Megías Homar, Guillem (Universitat Politècnica de Catalunya, 2019-07-10)
    Treball Final de Grau
    Accés restringit per decisió de l'autor

  • All-flavor search for a diffuse flux of cosmic neutrinos with nine years of ANTARES data 

    Albert, A.; André, Michel; Anghinolfi, Marco; Anton, G.; Ardid Ramírez, Miguel (2018-01-20)
    Article
    Accés obert
    The ANTARES detector is at present the most sensitive neutrino telescope in the northern hemisphere. The highly significant cosmic neutrino excess observed by the Antarctic IceCube detector can be studied with ANTARES, ...

  • All-sky search for high-energy neutrinos from gravitational wave event GW170104 with the Antares neutrino telescope: The ANTARES Collaboration 

    Albert, A.; André, Michel; Anghinolfi, Marco; Anton, G.; Ardid Ramírez, Miguel (2017-12-28)
    Article
    Accés obert
    © 2017, The Author(s). Advanced LIGO detected a significant gravitational wave signal (GW170104) originating from the coalescence of two black holes during the second observation run on January 4th, 2017. An all-sky ...

  • Analysis of Interplanetary Coronal Mass Ejections Observed by STEREO and MESSENGER 

    González Álvarez, Marina (Universitat Politècnica de Catalunya, 2019-05-27)
    Treball Final de Grau
    Accés obert
    Realitzat a/amb:  National Aeronautics and Space Administration. Goddard Space Flight Center
    Coronal mass ejections (CMEs) expelled from the solar corona are a major space weather driver, both in space and on the ground. The fast-traveling CME plasma, which carries a twisted magnetic field, is a common source of ...

  • ANTARES constrains a blazar origin of two IceCube PeV neutrino events 

    Adrian Martinez, Silvia; Albert, Andreas; André, Michel (2015-04-01)
    Article
    Accés obert
    Context. The source(s) of the neutrino excess reported by the IceCube Collaboration is unknown. The TANAMI Collaboration recently reported on the multiwavelength emission of six bright, variable blazars which are positionally ...

  • A polarized fast radio burst at low Galactic latitude 

    Rowlinson, A.; O'Sullivan, Michael; Anghinolfi, Marco; Anton, G.; Avgitas, T.; Bertin, V.; Puricelli, Stefano; Coniglione, R.; Gleixner, A; Lefèvre, Dominique; Michael, Turner; Pellegrino, Carlo; Piattelli, P.; Sanchez Losa, Agustín; Schnabel, J.; Trovato, A.; Zúñiga Román, Juan; Elejabarrieta, María Jesús; Schrenk, Bernhard; Hahn, James K.; Lamanna, G.; Moulin, Eric; Moya Señas, Ignacio; Santangelo, A; Schulz, André; Vink, J; Wagner, Peter; Yang, Rong; Zaborov, D.; André, Michel (2017-08-01)
    Article
    Accés obert
    We report on the discovery of a new fast radio burst (FRB), FRB 150215, with the Parkes radio telescope on 2015 February 15. The burst was detected in real time with a dispersion measure (DM) of 1105.6 ± 0.8 pc cm-3, a ...

  • A remarkable recurrent nova in M 31: The predicted 2014 outburst in X-rays with Swift 

    Henze, Martin; Ness, J.; Darnley, M. J.; Bode, M. F.; Williams, S. C.; Shafter, A. W.; Sala Cladellas, Glòria; Kato, M.; Hachisu, I.; Hernanz Carbó, Margarita (2015-08-01)
    Article
    Accés obert
    Context. The M 31 nova M31N 2008-12a was recently found to be a recurrent nova (RN) with a recurrence time of about one year. This is by far the fastest recurrence time scale of any known RN.; Aims. Our optical monitoring ...

  • Astrophysical parameter determination using chaotic orbital regions 

    Nicolás Álvarez, Jorge (Universitat Politècnica de Catalunya, 2018-02-27)
    Projecte Final de Màster Oficial
    Accés obert
    The goal of this thesis is to show that chaotic orbits of a dynamical system are advantageous (compared with regularnes) to determine the characteristic parameters of the system, and to give an estimate about the behaviour ...

  • Astrophysics at n-TOF facility at CERN 

    Tagliente, G.; Abbondanno, U.; Aerts, G.; Calviño Tavares, Francisco; Pretel Sánchez, Carme (Institute of Physics (IOP), 2010)
    Text en actes de congrés
    Accés obert
    The neutron time of flight (n_TOF) facility at CERN is a spallation neutron source with white neutron energy spectrum (from thermal to several GeV), covering the full energy range of interest for nuclear astrophysics, in ...

  • A Trojan horse approach to the production of 18F in Novae 

    la Cognata, M; Pizzone, R; José Pont, Jordi; Hernanz Carbó, Margarita; Cherubini, S; Gulino, M; Rapisarda, G; Spitaleri, C (2017-09-01)
    Article
    Accés obert
    Crucial information on nova nucleosynthesis can be potentially inferred from ¿-ray signals powered by 18F decay. Therefore, the reaction network producing and destroying this radioactive isotope has been extensively studied ...

  • Axions and the luminosity function of white dwarfs : the thin and thick discs, and the halo 

    Isern Vilaboy, Jordi; García-Berro Montilla, Enrique; Torres Gil, Santiago; Cojocaru, Elena Ruxandra; Catalán, S (Oxford University Press, 2018-08-01)
    Article
    Accés obert
    The evolution of white dwarfs is a simple gravothermal process of cooling. Since the shape of their luminosity function is sensitive to the characteristic cooling time, it is possible to use its slope to test the existence ...

  • Beta-decay half-lives and beta-delayed neutron emission probabilities for several isotopes of Au, Hg, Tl, Pb, and Bi, beyond N = 126 

    Caballero-Folch, R.; Domingo-Pardo, C; Agramunt Ros, Jorge; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere (2017-06-23)
    Article
    Accés obert
    Background: There have been measurements on roughly 230 nuclei that are beta-delayed neutron emitters. They range from 8He up to 150La. Apart from 210Tl, with a branching ratio of only 0.007%, no other neutron emitter has ...

  • Beyond the required LISA free-fall performance: new LISA pathfinder results down to 20 mu Hz 

    Armano, M.; Audley, H.; Baird, J.; Binetruy, P.; Ramos Castro, Juan José (American Institute of Physics (AIP), 2018-02-05)
    Article
    Accés obert
    In the months since the publication of the first results, the noise performance of LISA Pathfinder has improved because of reduced Brownian noise due to the continued decrease in pressure around the test masses, from a ...

  • Characterisation of the Hamamatsu photomultipliers for the KM3NeT Neutrino Telescope 

    Aiello, S; Ameli, F; André, Michel; Anghinolfi, Marco; Anton, G.; Ardid Ramírez, Miguel; Avgitas, T.; Bertin, V.; Bormuth, R.; Bouwhuis, M.C.; Puricelli, Stefano; Cherubini, Silvio; Coniglione, R.; Mannheim, Karl; Morganti, Michele; Pellegrino, Carlo; Piattelli, P.; Real, Del; Santangelo, A; Sharma, Aniruddh; Trovato, A.; Zaborov, D.; Zúñiga Román, Juan (2018-05-01)
    Article
    Accés obert
    The Hamamatsu R12199-02 3-inch photomultiplier tube is the photodetector chosen for the first phase of the KM3NeT neutrino telescope. About 7000 photomultipliers have been characterised for dark count rate, timing spread ...

  • Characteristics and energy dependence of recurrent galactic cosmic-ray flux depressions and of a forbush decrease with LISA Pathfinder 

    Armano, M.; Audley, H.; Baird, J.; Bassan, M.; Benella, S.; Lobo, J.A.; Ramos Castro, Juan José (2018-02-16)
    Article
    Accés obert
    Galactic cosmic-ray (GCR) energy spectra observed in the inner heliosphere are modulated by the solar activity, the solar polarity and structures of solar and interplanetary origin. A high counting rate particle detector ...

  • Commissioning of the BRIKEN beta-delayed neutron detector for the study of exotic neutron-rich nuclei 

    Tolosa-Delgado, Alvaro; Agramunt Ros, Jorge; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Tarifeño Saldivia, Ariel Esteban (EDP Sciences, 2018)
    Comunicació de congrés
    Accés obert
    Beta-delayed neutron emission (Beta-n) is a form of radioactive decay in which an electron, an anti-neutrino and one or more neutrons are emitted. This process arises if the energy window of the decay Q_Beta is greater ...

  • Discovery of Cl-34g,Cl-m(p,gamma)Ar-35 resonances activated at classical nova temperatures 

    Fry, C.; Wrede, Christopher; Bishop, Shawn M.; Brown, B. A.; Chen, Alan A.; Faestermann, Thomas; Hertenberger, R.; Parikh, Anuj Ramesh; Perez Loureiro, D; Wirth, Hans Friedrich; Garcia, A.; Ortez, Ronaldo (2015-01-13)
    Article
    Accés obert
    Background: The thermonuclear Cl-34g,Cl-m(p,gamma)Ar-35 reaction rates are unknown due to a lack of experimental nuclear physics data. Uncertainties in these rates translate to uncertainties in S-34 production in models ...

  • Distorsiones de espacio-tiempo y los viajes interestelares 

    Martín Cabezón, Rubén (2009-10-20)
    Audiovisual
    Accés obert
    Desde que a principios del siglo XX la Relatividad General hiciera su aparición, nuestra comprensión de la gravedad, una de las fuerzas más primordiales (y poco comprendida), ha aumentado considerablemente. Esta teoría ...

  • Ernst K. Zinner (1937-2015) 

    Nittler, L.; José Pont, Jordi (2017)
    Text en actes de congrés
    Accés obert