162 research outputs found
Effect of Electron Traps on Scintillation of Praseodymium Activated Lu3Al5O12
No full textIn this paper we present the studies performed on a set of Lu3Al5O12:Pr (LuAG:Pr) crystals with praseodymium concentration between 1.5 and 10%, grown by the micro-pulling-down (muPD) technique. The research comprises the measurements of X-ray excited emission spectra and 137Cs gamma-ray pulse height spectra in a range from 78 to 600 K, and thermoluminescence glow curves. Based on experimental data we discuss the dependence of scintillation properties of Lu3Al5O12:Pr on praseodymium content and temperature. The main attention is focused on a distinct increase of scintillation yield with temperature, which we attribute to existence of shallow electron traps and their temperature-dependent contribution to scintillation of LuAG:Pr. An active role of traps is demonstrated by a novel experiment combining X-ray and laser excitation.Radiation, Radionuclides and ReactorsApplied Science
First characterization of Silicon crystalline fibers produced with the micro-pulling technique for future gravitational wave detectors
No full textThe design of the gravitational wave interferometric detectors of third generation is under way. An overall improvement of the detector performance can be obtained by reducing a few noise sources, such as seismic noise, shot noise, and most importantly thermal noise. We report here on the design and fabrication of low thermal-noise suspensions made of a new material presently under investigation. An ad hoc technique to produce crystalline silicon fibers has been developed; the first measurements of the fiber mechanical and thermal properties at room temperature have been performed and interpreted. Preliminary measurements of the mechanical losses at low temperature are also discussed
First characterization of silicon crystalline fibers produced with the mu-pulling technique for future gravitational wave detectors
No full textThe design of the gravitational wave interferometric detectors of third generation is under way. An overall improvement of the detector performance can be obtained by reducing a few noise sources, such as seismic noise, shot noise, and most importantly thermal noise. We report here on the design and fabrication of low thermal-noise suspensions made of a new material presently under investigation. An ad hoc technique to produce crystalline silicon fibers has been developed; the first measurements of the fiber mechanical and thermal properties at room temperature have been performed and interpreted. Preliminary measurements of the mechanical losses at low temperature are also discussed. (c) 2006 American Institute of Physics
Measurement of the thermoelastic properties of crystalline Si fibres
No full textIn order to reduce the thermal noise in future interferometers for gravitational wave (GW) detectors, new suspension materials with low thermal noise are under investigation. Crystalline silicon seems to be a promising material mainly at low temperature. A new technology to produce crystalline silicon fibres has been realized. Measurements of mechanical and thermal properties of the fibres at room temperature have been performed. Preliminary measurements at low temperature are presented
A first search for coincident gravitational waves and high energy neutrinos using LIGO, Virgo and ANTARES data from 2007
No full textWe present the results of the fi rst search for gravitational wave bursts associated with high energy neutrinos. Together, these messengers could reveal new, hidden sources that are not observed by conventional photon astronomy, particularly at high energy. Our search uses neutrinos detected by the underwater neutrino telescope ANTARES in its 5 line con guration during the period January - September 2007, which coincided with the fifth and fi rst science runs of LIGO and Virgo, respectively. The LIGO-Virgo data were analysed for candidate gravitational-wave signals coincident in time and direction with the neutrino events. No signi cant coincident events were observed. We place limits on the density of joint high energy neutrino - gravitational wave emission events in the local universe, and compare them with densities of merger and core-collapse events.The authors also acknowledge the financial support of the funding agencies for the construction and operation of the ANTARES neutrino telescope: Centre National de la Recherche Scientifique (CNRS), Commissariat a l'energie atomique et aux energies alternatives (CEA), Agence National de la Recherche (ANR), Commission Europeenne (FEDER fund and Marie Curie Program), Region Alsace (contrat CPER), Region Provence-Alpes-Cote d'Azur, Departement du Var and Ville de La Seyne-sur-Mer, France; Bundesministerium fur Bildung und Forschung (BMBF), Germany; Istituto Nazionale di Fisica Nucleare (INFN), Italy; Stichting voor Fundamenteel Onderzoek der Materie (FOM), Nederlandse organisatie voor Wetenschappelijk Onderzoek (NWO), the Netherlands; Council of the President of the Russian Federation for young scientists and leading scientific schools supporting grants, Russia; National Authority for Scientific Research (ANCS), Romania; Ministerio de Ciencia e Innovacion (MICINN), Prometeo of Generalitat Valenciana (GVA) and Multi-Dark, Spain. They also acknowledge the technical support of Ifremer, AIM and Foselev Marine for the sea operation and the CC-IN2P3 for the computing facilities. This publication has been assigned LIGO Document Number LIGO-P1200006.Adrián Martínez, S.; Ardid Ramírez, M.; Bou Cabo, M.; Ferri García, M.; Larosa, G.; Martínez Mora, JA.; Astraatmadja, T.... (2013). A first search for coincident gravitational waves and high energy neutrinos using LIGO, Virgo and ANTARES data from 2007. Journal of Cosmology and Astroparticle Physics. 2013(6):1-39. https://doi.org/10.1088/1475-7516/2013/06/008S13920136Abadie, J., Abbott, B. P., Abbott, R., Accadia, T., Acernese, F., Adhikari, R., … Ceron, E. A. (2010). SEARCH FOR GRAVITATIONAL-WAVE INSPIRAL SIGNALS ASSOCIATED WITH SHORT GAMMA-RAY BURSTS DURING LIGO’S FIFTH AND VIRGO’S FIRST SCIENCE RUN. The Astrophysical Journal, 715(2), 1453-1461. doi:10.1088/0004-637x/715/2/1453Abadie, J., Abbott, B. P., Abbott, R., Abernathy, M., Accadia, T., Acernese, F., … Allen, B. (2012). Publisher’s Note: Search for gravitational waves from compact binary coalescence in LIGO and Virgo data from S5 and VSR1 [Phys. Rev. D82, 102001 (2010)]. Physical Review D, 85(8). doi:10.1103/physrevd.85.089903Abadie, J., Abbott, B. P., Abbott, R., Abernathy, M., Accadia, T., Acernese, F., … Allen, B. (2010). Predictions for the rates of compact binary coalescences observable by ground-based gravitational-wave detectors. Classical and Quantum Gravity, 27(17), 173001. doi:10.1088/0264-9381/27/17/173001Abadie, J., Abbott, B. P., Abbott, R., Abernathy, M., Accadia, T., Acernese, F., … Allen, B. (2011). SEARCH FOR GRAVITATIONAL WAVE BURSTS FROM SIX MAGNETARS. The Astrophysical Journal, 734(2), L35. doi:10.1088/2041-8205/734/2/l35Abadie, J., Abbott, B. P., Abbott, R., Abbott, T. D., Abernathy, M., Accadia, T., … Affeldt, C. (2012). All-sky search for gravitational-wave bursts in the second joint LIGO-Virgo run. Physical Review D, 85(12). doi:10.1103/physrevd.85.122007Abadie, J., Abbott, B. P., Abbott, R., Abbott, T. D., Abernathy, M., Accadia, T., … Affeldt, C. (2012). SEARCH FOR GRAVITATIONAL WAVES ASSOCIATED WITH GAMMA-RAY BURSTS DURING LIGO SCIENCE RUN 6 AND VIRGO SCIENCE RUNS 2 AND 3. The Astrophysical Journal, 760(1), 12. doi:10.1088/0004-637x/760/1/12Abadie, J., Abbott, B. P., Abbott, R., Abbott, T. D., Abernathy, M., Accadia, T., … Affeldt, C. (2012). Search for gravitational waves from low mass compact binary coalescence in LIGO’s sixth science run and Virgo’s science runs 2 and 3. Physical Review D, 85(8). doi:10.1103/physrevd.85.082002Abbasi, R., Abdou, Y., Abu-Zayyad, T., Adams, J., Aguilar, J. A., Ahlers, M., … Baker, M. (2010). SEARCH FOR MUON NEUTRINOS FROM GAMMA-RAY BURSTS WITH THE IceCube NEUTRINO TELESCOPE. The Astrophysical Journal, 710(1), 346-359. doi:10.1088/0004-637x/710/1/346Abbasi, R., Abdou, Y., Abu-Zayyad, T., Adams, J., Aguilar, J. A., Ahlers, M., … Baker, M. (2011). Erratum: Constraints on the extremely-high energy cosmic neutrino flux with the IceCube 2008-2009 data [Phys. Rev. D83, 092003 (2011)]. Physical Review D, 84(7). doi:10.1103/physrevd.84.079902Abbasi, R., Abdou, Y., Abu-Zayyad, T., Adams, J., Aguilar, J. A., Ahlers, M., … Baker, M. (2011). Limits on Neutrino Emission from Gamma-Ray Bursts with the 40 String IceCube Detector. Physical Review Letters, 106(14). doi:10.1103/physrevlett.106.141101(2012). An absence of neutrinos associated with cosmic-ray acceleration in γ-ray bursts. Nature, 484(7394), 351-354. doi:10.1038/nature11068Abbasi, R., Abdou, Y., Abu-Zayyad, T., Ackermann, M., Adams, J., Aguilar, J. A., … Andeen, K. (2012). Searching for soft relativistic jets in core-collapse supernovae with the IceCube optical follow-up program. Astronomy & Astrophysics, 539, A60. doi:10.1051/0004-6361/201118071Abbasi, R., Abdou, Y., Abu-Zayyad, T., Adams, J., Aguilar, J. A., Ahlers, M., … Baker, M. (2011). TIME-DEPENDENT SEARCHES FOR POINT SOURCES OF NEUTRINOS WITH THE 40-STRING AND 22-STRING CONFIGURATIONS OF ICECUBE. The Astrophysical Journal, 744(1), 1. doi:10.1088/0004-637x/744/1/1Abbott, B., Abbott, R., Adhikari, R., Ajith, P., Allen, B., Allen, G., … Arain, M. A. (2008). Beating the Spin-Down Limit on Gravitational Wave Emission from the Crab Pulsar. The Astrophysical Journal, 683(1), L45-L49. doi:10.1086/591526Abbott, B., Abbott, R., Adhikari, R., Ajith, P., Allen, B., Allen, G., … Arain, M. A. (2008). Search for Gravitational-Wave Bursts from Soft Gamma Repeaters. Physical Review Letters, 101(21). doi:10.1103/physrevlett.101.211102Abbott, B., Abbott, R., Adhikari, R., Agresti, J., Ajith, P., Allen, B., … Arain, M. (2008). Search for gravitational waves associated with 39 gamma-ray bursts using data from the second, third, and fourth LIGO runs. Physical Review D, 77(6). doi:10.1103/physrevd.77.062004Abbott, B. P., Abbott, R., Adhikari, R., Ajith, P., Allen, B., Allen, G., … Arain, M. A. (2009). First LIGO search for gravitational wave bursts from cosmic (super)strings. Physical Review D, 80(6). doi:10.1103/physrevd.80.062002Abbott, B. P., Abbott, R., Adhikari, R., Ajith, P., Allen, B., Allen, G., … Arain, M. A. (2009). LIGO: the Laser Interferometer Gravitational-Wave Observatory. Reports on Progress in Physics, 72(7), 076901. doi:10.1088/0034-4885/72/7/076901Abbott, B. P., Abbott, R., Adhikari, R., Ajith, P., Allen, B., Allen, G., … Arain, M. A. (2009). STACKED SEARCH FOR GRAVITATIONAL WAVES FROM THE 2006 SGR 1900+14 STORM. The Astrophysical Journal, 701(2), L68-L74. doi:10.1088/0004-637x/701/2/l68Abbott, B. P., Abbott, R., Acernese, F., Adhikari, R., Ajith, P., Allen, B., … Anderson, S. B. (2010). SEARCH FOR GRAVITATIONAL-WAVE BURSTS ASSOCIATED WITH GAMMA-RAY BURSTS USING DATA FROM LIGO SCIENCE RUN 5 AND VIRGO SCIENCE RUN 1. The Astrophysical Journal, 715(2), 1438-1452. doi:10.1088/0004-637x/715/2/1438Accadia, T., Acernese, F., Alshourbagy, M., Amico, P., Antonucci, F., Aoudia, S., … Astone, P. (2012). Virgo: a laser interferometer to detect gravitational waves. Journal of Instrumentation, 7(03), P03012-P03012. doi:10.1088/1748-0221/7/03/p03012Acernese, F., Alshourbagy, M., Amico, P., Antonucci, F., Aoudia, S., Astone, P., … Barone, F. (2008). Status of Virgo. Classical and Quantum Gravity, 25(11), 114045. doi:10.1088/0264-9381/25/11/114045Achterberg, A., Ackermann, M., Adams, J., Ahrens, J., Andeen, K., Atlee, D. W., … Bartelt, M. (2006). Limits on the High-Energy Gamma and Neutrino Fluxes from the SGR 1806-20 Giant Flare of 27 December 2004 with the AMANDA-II Detector. Physical Review Letters, 97(22). doi:10.1103/physrevlett.97.221101Adrián-Martínez, S., Al Samarai, I., Albert, A., André, M., Anghinolfi, M., Anton, G., … Aubert, J.-J. (2012). Search for neutrino emission from gamma-ray flaring blazars with the ANTARES telescope. Astroparticle Physics, 36(1), 204-210. doi:10.1016/j.astropartphys.2012.06.001Adrián-Martínez, S., Al Samarai, I., Albert, A., André, M., Anghinolfi, M., Anton, G., … Aubert, J.-J. (2012). SEARCH FOR COSMIC NEUTRINO POINT SOURCES WITH FOUR YEARS OF DATA FROM THE ANTARES TELESCOPE. The Astrophysical Journal, 760(1), 53. doi:10.1088/0004-637x/760/1/53Adrián-Martínez, S., Al Samarai, I., Albert, A., André, M., Anghinolfi, M., Anton, G., … Aubert, J.-J. (2012). Measurement of atmospheric neutrino oscillations with the ANTARES neutrino telescope. Physics Letters B, 714(2-5), 224-230. doi:10.1016/j.physletb.2012.07.002Ageron, M., Aguilar, J. A., Al Samarai, I., Albert, A., Ameli, F., André, M., … Ardid, M. (2011). ANTARES: The first undersea neutrino telescope. 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correlation with the 8 events observed by the EXPLORER and
NAUTILUS detectors in 2001. Astronomy & Astrophysics, 421(2), 399-405. doi:10.1051/0004-6361:20040244Aguilar, J. A., Albert, A., Ameli, F., Amram, P., Anghinolfi, M., Anton, G., … Aubert, J.-J. (2005). Study of large hemispherical photomultiplier tubes for the ANTARES neutrino telescope. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 555(1-2), 132-141. doi:10.1016/j.nima.2005.09.035Aguilar, J. A., Albert, A., Ameli, F., Anghinolfi, M., Anton, G., Anvar, S., … Basa, S. (2007). The data acquisition system for the ANTARES neutrino telescope. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 570(1), 107-116. doi:10.1016/j.nima.2006.09.098Aguilar, J. A., Albert, A., Anton, G., Anvar, S., Ardid, M., Assis Jesus, A. C., … Baret, B. (2010). Zenith distribution and flux of atmospheric muons measured with the 5-line ANTARES detector. 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Environmental noise studies in Virgo
No full textThe study of the external influences from environmental disturbances is a fundamental issue in interferometric detection of gravitational wave, both in locking and in normal operation. Virgo is continuously monitored by a large number of environmental sensors, ranging from seismometers to microphones to electromagnetic probes, up to a weather station. Using data collected during the engineering runs, we have studied the features of the main external noise sources, and the way they interfere with Virgo operation and expected sensitivity. In this paper we present the preliminary results obtained. © 2006 IOP Publishing Ltd
Search for inspiralling binary events in the Virgo engineering run data
No full textWe report preliminary results of a search for inspiralling binary events, performed on data produced by the Virgo Central Interferometer during the Engineering 4 run. Given the limited sensitivity to gravitational waves, the goal was to test some of the analysis chain elements and their integration. The search method was the matched filtering, supplemented by a χ2 based method for the rejection of non-Gaussian events. The range of masses explored was [2–5] M⊙, while the frequency range considered was [24–1000] Hz. The algorithm was preliminarily tested on simulated data. On real E4 data, candidates were selected by the matched filter when the return SNR value was greater than 7; none of them survived the χ2 test. Further, it was possible to put in correspondence the candidates with precise external disturbances in the apparatus
Virgo upgrade investigations
No full textWhile the current interferometric gravitational wave detectors are approching their nominal sensitivity, the new generation of detectors is in an advanced design phase. The Virgo collaboration is de.ning now the path to arrive to a complete design of the advanced version of the detector within about two years. The upgrades needed to obtain a detector with improved sensitivity in a relatively short time are here discussed. © 2006 IOP Publishing Ltd
A parallel in-time analysis system for Virgo
No full textThe interferometric gravitational wave detector Virgo is currently completing its commissioning phase and it is close to start scientific observations. Among the signals to be searched for, those emitted by coalescing binary systems are particularly promising and require a considerable computational effort to optimally search the parameter space. The Virgo collaboration has decided to implement an on-line analysis strategy capable of processing the interferometer data in-time. In this communication we present a component of the analysis pipeline, a parallel computing system based on the Message Passing Interface (MPI). We describe its capabilities, underlining its strength and flexibility, and we illustrate its relation with the other components of the pipeline. The on-line analysis chain, including the presented parallel system, has been run for the first time successfully during the Virgo commissioning run C5 in December 2nd to December 6th 2004[1]. © 2006 IOP Publishing Ltd
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