Browsing by Subject "Astrophysics"
Now showing items 1-20 of 101
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7Be(n,alpha) and 7Be(n,p) cross-section measurement for the cosmological lithium problem at the n TOF facility at CERN
(EDP Sciences, 2016)
Conference lecture
Open AccessThe 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
(Universitat Politècnica de Catalunya, 2019-07-10)
Bachelor thesis
Restricted access - author's decision -
A polarized fast radio burst at low Galactic latitude
(2017-08-01)
Article
Open AccessWe 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
(2015-08-01)
Article
Open AccessContext. 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
(2017-09-01)
Article
Open AccessCrucial 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 ... -
All-flavor search for a diffuse flux of cosmic neutrinos with nine years of ANTARES data
(2018-01-20)
Article
Open AccessThe 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
(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
(Universitat Politècnica de Catalunya, 2019-05-27)
Bachelor thesis
Open Access
Covenantee: National Aeronautics and Space Administration. Goddard Space Flight CenterCoronal 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
(2015-04-01)
Article
Open AccessContext. 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 ... -
Astrophysical parameter determination using chaotic orbital regions
(Universitat Politècnica de Catalunya, 2018-02-27)
Master thesis
Open Access
Covenantee: European Space Research and Technology CentreThe 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
(Institute of Physics (IOP), 2010)
Conference report
Open AccessThe 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
(Oxford University Press, 2018-08-01)
Article
Open AccessThe 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
(2017-06-23)
Article
Open AccessBackground: 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
(American Institute of Physics (AIP), 2018-02-05)
Article
Open AccessIn 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
(2018-05-01)
Article
Open AccessThe 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
(2018-02-16)
Article
Open AccessGalactic 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
(EDP Sciences, 2018)
Conference lecture
Open AccessBeta-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 ... -
Constraining the origin of the short timescales X-ray variability of the Seyfert galaxy NGC 7469
(Universitat Politècnica de Catalunya, 2020-06)
Bachelor thesis
Open Access
Covenantee: Nicolaus Copernicus Astronomical CenterThis bachelor thesis is a small part of a much larger project related to the study of the X-ray properties of the active galactic nucleus (AGN) NGC 7469. In this report I will focus on the analysis of the short-timescales ... -
Discovery of Cl-34g,Cl-m(p,gamma)Ar-35 resonances activated at classical nova temperatures
(2015-01-13)
Article
Open AccessBackground: 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
(2009-10-20)
Audiovisual
Open AccessDesde 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 ...