Showing papers by "Royal Institute and Observatory of the Spanish Navy published in 2012"
University of Padua1, University of Pavia2, Instituto Politécnico Nacional3, University of California4, Russian Academy of Sciences5, CERN6, University of Silesia in Katowice7, Warsaw University of Technology8, University of L'Aquila9, University of Pisa10, Polytechnic University of Milan11, Royal Institute and Observatory of the Spanish Navy12, German National Metrology Institute13
TL;DR: The ICARUS-T600 detector has collected 25 neutrino-associated events; the corresponding time of flight has been accurately evaluated, using all different time synchronization paths.
Abstract: During May 2012, the CERN-CNGS neutrino beam has been operated for two weeks for a total of ~1.8 × 1017 p.o.t., with the proton beam made of bunches, few ns wide and separated by 100 ns. This beam structure allows a very accurate time of flight measurement of neutrinos from CERN to LNGS on an event-by-event basis. Both the ICARUS-T600 PMT-DAQ and the CERN-LNGS timing synchronization have been substantially improved for this campaign, taking advantage of additional independent GPS receivers, both at CERN and LNGS as well as of the deployment of the “White Rabbit” protocol both at CERN and LNGS. The ICARUS-T600 detector has collected 25 beam-associated events; the corresponding time of flight has been accurately evaluated, using all different time synchronization paths. The measured neutrino time of flight is compatible with the arrival of all events with speed equivalent to the one of light: the difference between the expected value based on the speed of light and the measured value is δt = tof
c
−tof
ν
= 0.10 ± 0.67stat. ± 2.39syst. ns. This result is in agreement with the value previously reported by the ICARUS Collaboration, δt = 0.3 ± 4.9stat. ± 9.0syst. ns, but with improved statistical and systematic accuracy.
67 citations
CERN1, Polytechnic University of Milan2, Princeton University3, University of Hamburg4, Virginia Tech5, University of Massachusetts Amherst6, University of Houston7, Petersburg Nuclear Physics Institute8, Kurchatov Institute9, Royal Institute and Observatory of the Spanish Navy10, Joint Institute for Nuclear Research11, Paris Diderot University12, Technische Universität München13, Max Planck Society14
TL;DR: In this article, the authors measured the speed of neutrinos with the Borexino detector using short-bunch CNGS beams, and the final result for the difference in time of flight between an 〈 E 〉 = 17 GeV muon neutrino and a particle moving at speed of light in vacuum is δ t = 0.8 ± 0.7 stat ± 2.9 sys ns, well consistent with zero.
54 citations
TL;DR: In this article, the authors describe the design, the equipment, and the calibration of a new GPS based time link between CERN and the Borexino experiment at the Gran Sasso Laboratory in Italy.
Abstract: We describe the design, the equipment, and the calibration of a new GPS based time link between CERN and the Borexino experiment at the Gran Sasso Laboratory in Italy. This system has been installed and operated in Borexino since March 2012, and used for a precise measurement of CNGS muon neutrinos speed in May 2012. The result of the measurement will be reported in a different letter.
10 citations
23 Apr 2012
TL;DR: ROA supported the coordination of the EURAMET Technical Committee for Time and Frequency (TC-TF) Project 1156, GPSCALEU, to study the characterization of GNSS equipment in use for establishing the time links between institutes contributing with their clocks to TAI.
Abstract: Since 2010 ROA has supported the coordination of the EURAMET Technical Committee for Time and Frequency (TC-TF) Project 1156, GPSCALEU, a reaction from EURAMET TC-TF to Recommendation 2 of CCTF 2009: to study the characterization of GNSS equipment in use for establishing the time links between institutes contributing with their clocks to TAI. Starting that year, it was organized a GPS calibration campaign between three contributing laboratories: ROA (Spain), PTB (Germany) and INRIM (Italy). The time transfer results were achieved by using P3, and also carrier phase PPP comparison techniques. These results were also used to re-calibrate the TWSTFT (Two-Way Satellite Time and Frequency Transfer, TW for short) links between the involved laboratories, with an uncertainty slightly higher than GPS links.
7 citations
Posted Content•
TL;DR: In this paper, the authors describe the design, the equipment, and the calibration of a new GPS based time link between CERN and the Borexino experiment at the Gran Sasso Laboratory in Italy.
Abstract: We describe the design, the equipment, and the calibration of a new GPS based time link between CERN and the Borexino experiment at the Gran Sasso Laboratory in Italy. This system has been installed and operated in Borexino since March 2012, and used for a precise measurement of CNGS muon neutrinos speed in May 2012. The result of the measurement will be reported in a different letter.
1 citations