680 research outputs found
Understanding the performance of the low energy neutrino factory: the dependence on baseline distance and stored-muon energy
Motivated by recent hints of large {\theta}13 from the T2K, MINOS and Double
Chooz experiments, we study the physics reach of a Low Energy Neutrino Factory
(LENF) and its dependence on the chosen baseline distance, L, and stored-muon
energy, E_{\mu}, in order to ascertain the configuration of the optimal LENF.
In particular, we study the performance of the LENF over a range of baseline
distances from 1000 km to 4000 km and stored-muon energies from 4 GeV to 25
GeV, connecting the early studies of the LENF (1300 km, 4.5 GeV) to those of
the conventional, high-energy neutrino factory design (4000 km and 7000 km, 25
GeV). Three different magnetized detector options are considered: a
Totally-Active Scintillator Detector (TASD) and two models of a liquid-argon
detector distinguished by optimistic and conservative performance estimates. In
order to compare the sensitivity of each set-up, we compute the full
{\delta}-dependent discovery contours for the determination of non-zero
{\theta}13, CP-violating values of {\delta} and the mass hierarchy. In the case
of large {\theta}13 with sin^2(2*{\theta}13) = (few)*10^{-3}, the LENF provides
a strong discovery potential over the majority of the L-E_{\mu} parameter space
and is a promising candidate for the future generation of long baseline
experiments aimed at discovering CP-violation and the mass hierarchy, and at
making a precise determination of the oscillation parameters.Comment: 14 pages, 5 figure
Observations of Extragalactic Sources with the MAGIC Telescope
MAGIC is currently the world's largest single dish ground based imaging
atmospheric Cherenkov telescope. During the first year of operation, more than
20 extragalactic sources have been observed and several of them detected. Here
we present results of analyzed data, including discussion about spectral and
temporal properties of the detected sources. In addition, we discuss
implications of the measured energy spectra of distant sources for our
knowledge of the extragalactic background light.Comment: to appear in proceedings of Multi Messenger conference, Barcelona,
July 4-7, 200
MeV sterile neutrinos in low reheating temperature cosmological scenarios
It is commonly assumed that the cosmological and astrophysical bounds on the
mixings of sterile with active neutrinos are much more stringent than those
obtained from laboratory measurements. We point out that in scenarios with a
very low reheating temperature T_RH << 100 MeV at the end of (the last episode
of) inflation or entropy creation, the abundance of sterile neutrinos becomes
largely suppressed with respect to that obtained within the standard framework.
Thus, in this case cosmological bounds become much less stringent than usually
assumed, allowing sterile neutrinos to be ``visible'' in future experiments.
Here, we concentrate on massive (mostly sterile) neutrinos heavier than 1 MeV.Comment: 14 pp, 7 fig
Full polarization study of SiO masers at 86 GHz
We study the polarization of the SiO maser emission in a representative
sample of evolved stars in order to derive an estimate of the strength of the
magnetic field, and thus determine the influence of this magnetic field on
evolved stars. We made simultaneous spectroscopic measurements of the 4 Stokes
parameters, from which we derived the circular and linear polarization levels.
The observations were made with the IF polarimeter installed at the IRAM 30m
telescope. A discussion of the existing SiO maser models is developed in the
light of our observations. Under the Zeeman splitting hypothesis, we derive an
estimate of the strength of the magnetic field. The averaged magnetic field
varies between 0 and 20 Gauss, with a mean value of 3.5 Gauss, and follows a
1/r law throughout the circumstellar envelope. As a consequence, the magnetic
field may play the role of a shaping, or perhaps collimating agent of the
circumstellar envelopes in evolved objects.Comment: 22 pages, accepted in A&A (19/12/2005
Daedalus: A hardware signal analyser for Icarus
Icarus detector [1] is a large-volume (400 cm) liquid Argon TPC that requires continuous high rate sampling signal recording on each channel (about 50 000) to produce event images quite similar to the ones from bubble chambers. In order to optimize the memory usage, a signal feature extractor, that commands memory writing only upon signal detection, has been designed in VLSI CMOS. ( 1998 Elsevier Science B.V. All rights reserved
Immunohistochemical localization of IGF-I, IGF-II and MSTN proteins during development of triploid sea bass (Dicentrarchus labrax)
The cellular localization of IGF-I, IGF-II and MSTN proteins was investigated during ontogenesis of triploid sea bass (Dicentrarchus labrax) by an immunohistochemical approach. The results were compared with those observed in diploids. IGF-I immunostaining was mainly observed in skin, skeletal muscle, intestine and gills of both diploids and triploids. From day 30 of larval life, IGF-I immunoreactivity observed in skeletal muscle, intestine, gills and kidney was stronger in triploids than in diploids. At day 30, triploids exhibited a standard length significantly higher than the one of diploids. Although IGF-II and MSTN immunoreactivity was detectable in different tissues and organs, no differences between diploids and triploids were observed. The spatial localization of IGF-I, IGF-II and MSTN proteins detected in this study is in agreement with previous findings on the distribution of these proteins in diploid larvae and fry. The highest IGF-I immunoreactivity observed in triploids suggests a possible involvement of ploidy in their growth performance
Investigation of double beta decay with the NEMO-3 detector
The double beta decay experiment NEMO~3 has been taking data since February
2003. The aim of this experiment is to search for neutrinoless
() decay and investigate two neutrino double beta decay in
seven different isotopically enriched samples (Mo, Se,
Ca, Zr, Cd, Te and Nd). After analysis of
the data corresponding to 3.75 y, no evidence for decay in the
Mo and Se samples was found. The half-life limits at the 90%
C.L. are y and y, respectively.
Additionally for decay the following limits at the 90% C.L.
were obtained, y for Ca, y
for Zr and y for Nd. The
decay half-life values were precisely measured for all investigated isotopes.Comment: 12 pages, 4 figures, 5 tables; talk at conference on "Fundamental
Interactions Physics" (ITEP, Moscow, November 23-27, 2009
The MAGIC Experiment and Its First Results
With its diameter of 17m, the MAGIC telescope is the largest Cherenkov
detector for gamma ray astrophysics. It is sensitive to photons above an energy
of 30 GeV. MAGIC started operations in October 2003 and is currently taking
data. This report summarizes its main characteristics, its rst results and its
potential for physics.Comment: 6 pages, 3 figures, to be published in the Proceedings of the 6th
International Symposium ''Frontiers of Fundamental and Computational
Physics'' (FFP6), Udine (Italy), Sep. 26-29, 200
Joint Power Control and Structural Health Monitoring in Industry 4.0 Scenarios using Eclipse Arrowhead and Web of Things
The integration of legacy IoT ecosystems in Industry 4.0 scenarios requires human effort to adapt single devices. This process would highly benefit from features like device lookup, loose coupling and late binding. In this paper, we tackle the issue of integrating legacy monitoring systems and actuation systems in an industrial scenario, by looking into the Web of Things (WoT) as a communication standard and the Eclipse Arrowhead Framework (AHF) as a service orchestrator. More specifically, we propose a general architectural approach to enable closed-loop automation between the above mentioned legacy systems by leveraging the adaptation of the WoT to the AHF. Then, we develop a rule-based engine that enables the control of the actuation based on sensor values. Finally, we present a proof-of-concept use case where we integrate a Structural Health Monitoring (SHM) scenario with a power control actuation subsystem using the developed component
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