4,700 research outputs found
Neutrino cross-section measurement with neutrinos from muon decay
In this paper we stress the idea that new, more precise neutrino
cross-sections measurements at low energies will be necessary to improve the
results of future big neutrino detectors, which will be dominated by the
contribution of the systematic errors. The use of a muon beam instead of the
traditional pion beams is proposed. This choice allows the simultaneous
measurement of both, numu and nue interactions and the two helicities, in a
clean environment and with a precise knowledge of the beam flux. We show that
with approx 10^{15} mu's/year and a moderate mass detector (approx 100 tons)
placed close to the muon storage ring, precisions of the order of 10% in
sigma(nu) (E_nu bin size of 100 MeV) can be reached for neutrino energies below
2 GeV.Comment: 4 pages, proceeding to NUFACT0
First generation interferometers
The status and plans for the first generation long baseline suspended mass interferometers TAMA, GEO, LIGO and Virgo are presented, as well as the expected performances
Amaldi Meeting Introduction
Welcome to Caltech and the 3rd Edoardo Amaldi Conference on Gravitational Waves.
Obviously, something must be very interesting to bring more than 250 scientists from
around the world to Pasadena in July for this particular meeting. In fact, July in
Southern California does have many attractions, in addition to the good weather and
cool nights. For this conference, we have arranged a visit to the new Getty Museum on
our excursion day. This is meant to make your stay more pleasant, but is not the real
reason we have gathered here. This meeting addresses the detection of gravitational
waves, a much-anticipated event
Pulsed energy power system Patent
Pulsed energy power system for application of combustible gases to turbine controlling ac voltage generato
The International Linear Collider
In this article, we describe the key features of the recently completed
technical design for the International Linear Collider (ILC), a 200-500 GeV
linear electron-positron collider (expandable to 1 TeV) that is based on 1.3
GHz superconducting radio-frequency (SCRF) technology. The machine parameters
and detector characteristics have been chosen to complement the Large Hadron
Collider physics, including the discovery of the Higgs boson, and to further
exploit this new particle physics energy frontier with a precision instrument.
The linear collider design is the result of nearly twenty years of R&D,
resulting in a mature conceptual design for the ILC project that reflects an
international consensus. We summarize the physics goals and capability of the
ILC, the enabling R&D and resulting accelerator design, as well as the concepts
for two complementary detectors. The ILC is technically ready to be proposed
and built as a next generation lepton collider, perhaps to be built in stages
beginning as a Higgs factory.Comment: 41 page
An Expressive Language and Efficient Execution System for Software Agents
Software agents can be used to automate many of the tedious, time-consuming
information processing tasks that humans currently have to complete manually.
However, to do so, agent plans must be capable of representing the myriad of
actions and control flows required to perform those tasks. In addition, since
these tasks can require integrating multiple sources of remote information ?
typically, a slow, I/O-bound process ? it is desirable to make execution as
efficient as possible. To address both of these needs, we present a flexible
software agent plan language and a highly parallel execution system that enable
the efficient execution of expressive agent plans. The plan language allows
complex tasks to be more easily expressed by providing a variety of operators
for flexibly processing the data as well as supporting subplans (for
modularity) and recursion (for indeterminate looping). The executor is based on
a streaming dataflow model of execution to maximize the amount of operator and
data parallelism possible at runtime. We have implemented both the language and
executor in a system called THESEUS. Our results from testing THESEUS show that
streaming dataflow execution can yield significant speedups over both
traditional serial (von Neumann) as well as non-streaming dataflow-style
execution that existing software and robot agent execution systems currently
support. In addition, we show how plans written in the language we present can
represent certain types of subtasks that cannot be accomplished using the
languages supported by network query engines. Finally, we demonstrate that the
increased expressivity of our plan language does not hamper performance;
specifically, we show how data can be integrated from multiple remote sources
just as efficiently using our architecture as is possible with a
state-of-the-art streaming-dataflow network query engine
Neutrino oscillation studies and the neutrino cross section
The present uncertainties in the knowledge of the neutrino cross sections for
E_nu \sim 1 GeV, that is in the energy range most important for atmospheric and
long baseline accelerator neutrinos, are large. These uncertainties do not play
a significant role in the interpretation of existing data, however they could
become a limiting factor in future studies that aim at a complete and accurate
determination of the neutrino oscillation parameters. New data and theoretical
understanding on nuclear effects and on the electromagnetic structure functions
at low Q^2 and in the resonance production region are available, and can be
valuable in reducing the present systematic uncertainties. The collaboration of
physicists working in different subfields will be important to obtain the most
from this available information. It is now also possible, with the facilities
developed for long baseline beams, to produce high intensity and well
controlled neutrino beams to measure the neutrino interaction properties with
much better precision that what was done in the past. Several projects and
ideas to fully exploit these possibilities are under active investigation.
These topics have been the object of the first neutrino interaction (NUINT01)
workshop.Comment: Summary talk at the 1st workshop on neutrino-nucleus interactions in
the few GeV region (NuInt01), Tsukuba, Japan, 13-16 Dec 2001. 14 pages, 7
figure
NC Data - Nuclear Collision Data for nucleon-nucleus collisions in the energy range 25 to 400 MeV
FORTRAN computer program for cross sections, and particle emission analysis in nucleon-nucleus collision
A radiometer for stochastic gravitational waves
The LIGO Scientific Collaboration recently reported a new upper limit on an
isotropic stochastic background of gravitational waves obtained based on the
data from the 3rd LIGO science Run (S3). Now I present a new method for
obtaining directional upper limits that the LIGO Scientific Collaboration
intends to use for future LIGO science runs and that essentially implements a
gravitational wave radiometer.Comment: 6 pages, 2 figure
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