Browsing by Subject "Astrophysics"

Now showing items 1-20 of 144

    • 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)
      Conference lecture
      Open Access
      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)
      Bachelor thesis
      Restricted access - author's decision

    • A model-based systems engineering approach to space mission education of a geographically disperse student workforce 

      Halvorson, Michael; Fuchs, Jared; Kung, Patrick; Thomas, Dale (Universitat Politècnica de Catalunya, 2022-04-29)
      Conference lecture
      Open Access
      The Alabama Burst Energetics eXplorer (ABEX) is a 12U CubeSat commissioned by the Alabama Space Grant Consortium; its astrophysics mission is to study the low energy, prompt emission of Gamma-ray Bursts in both gamma and ...

    • 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
      Open Access
      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
      Open Access
      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 ...

    • 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
      Open Access
      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 ...

    • Advances and new ideas for neutron-capture astrophysics experiments at CERN n_TOF 

      Domingo Pardo, César; Babiano Suárez, Víctor; Balibrea Correa, Javier; Lerendegui Marco, Jorge; Taín Enríquez, José Luis; Tarifeño Saldivia, Ariel; Aberle, O.; Alcayne Aicua, Víctor; Amaducci, Simone; Andrzejewski, Józef; Calviño Tavares, Francisco; Calviani, Marco; Casanovas Hoste, Adrià; Cortés Rossell, Guillem Pere; Cosentino, Luigi; Dressler, Rugard (Springer Nature, 2023-01-01)
      Article
      Open Access
      This article presents a few selected developments and future ideas related to the measurement of (n,¿) data of astrophysical interest at CERN n_TOF. The MC-aided analysis methodology for the use of low-efficiency radiation ...

    • 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
      Open Access
      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
      Open Access
      © 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)
      Bachelor thesis
      Open Access
      Covenantee:   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 ...

    • Analysis of Medium-Earth Orbit Radiation Effects in Digital Systems for Spacecraft 

      Gorchs Picas, Marti (Universitat Politècnica de Catalunya, 2022-05-25)
      Bachelor thesis
      Restricted access - confidentiality agreement
      Covenantee:   Université Grenoble Alpes
      Field-programmable gate array (FPGA) are very appealing for space-based applications thanks to their great flexibility, allowing reconfiguration during spaceflight. However, they are sensitive to space radiation, especially ...

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

      Adrian Martinez, Silvia; Albert, Andreas; André, Michel (2015-04-01)
      Article
      Open Access
      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 ...

    • ANTARES search for point sources of neutrinos using astrophysical catalogs: a likelihood analysis 

      Albert, A.; André, Michel; Anghinolfi, Marco; Anton, Gisela; Ardid Ramírez, Miguel; Aubert, J.-J.; Aublin, J.; Baret, Bruny; Basa, S. (Institute of Physics (IOP), 2021-04-10)
      Article
      Open Access
      A search for astrophysical pointlike neutrino sources using the data collected by the ANTARES detector between 2007 January 29 and 2017 December 31 is presented. A likelihood method is used to assess the significance of ...

    • ANTARES upper limits on the multi-TeV neutrino emission from the GRBs detected by IACTs 

      Albert, A.; André, Michel; Anghinolfi, Marco; Anton, Gisela; Ardid Ramírez, Miguel; Aubert, J.-J.; Aublin, J.; Baret, B.; Basa, Stéphane (2021-03-01)
      Article
      Open Access
      The first gamma-ray burst detections by Imaging Atmospheric Cherenkov Telescopes have been recently announced: GRB 190114C, detected by MAGIC, GRB 180720B and GRB 190829A, observed by H.E.S.S. A dedicated search for neutrinos ...

    • Approaching the exascale simulation of subsonic turbulence with smoothed particle hydrodynamics 

      Sanz Lechuga, Axel (Universitat Politècnica de Catalunya, 2022-09-09)
      Master thesis
      Open Access
      Turbulence is key to many astrophysical and cosmological scenarios. Hence, a correct depiction of it in numerical simulations is of capital importance. Kolmogorov's theory states that in the subsonic regime the energy ...

    • Architecture and performance of the KM3NeT front-end firmware 

      Aiello, S; Albert, Arnauld; Alves Garre, Sergio; Zineb, Aly; Ameli, Fabrizio; André, Michel; Androulakis, Giorgos; Anghinolfi, Marco; Anguita, M.; Anton, Gisela (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2021-01-01)
      Article
      Open Access
      The KM3NeT infrastructure consists of two deep-sea neutrino telescopes being deployed in the Mediterranean Sea. The telescopes will detect extraterrestrial and atmospheric neutrinos by means of the incident photons induced ...

    • Astrophysical parameter determination using chaotic orbital regions 

      Nicolás Álvarez, Jorge (Universitat Politècnica de Catalunya, 2018-02-27)
      Master thesis
      Open Access
      Covenantee:   European Space Research and Technology Centre
      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)
      Conference report
      Open Access
      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 ...

    • 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
      Open Access
      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
      Open Access
      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 ...