120500696
Optical trigger processor for high energy physics
Abstract We describe a novel incoherent optical processor employing a kinoform filter which is designed to solve a real-time pattern recognition problem in a high energy physics experiment.
118892816
High-statistics measurement of the pion form factor in the rho-meson energy range with the CMD-2 detector
We present a measurement of the pion form factor based on e+e- annihilation data from the CMD-2 detector in the energy range 0.6<sqrt(s)<1.0 GeV with a systematic uncertainty of 0.8%. A data sample is five times larger than that used in our previous measurement.
120840668
Stopping pions in high-energy nuclear cascades.
122920202
Phi Factory Detector Requirements
115852412
Y* Production in Sigma--Nucleus Reactions
11912858
Transputer based data acquisition system for the CMD-2 detector☆
Abstract CMD-2 [1] is currently studying e + e − annihilation in the energy range from 0.36 GeV to 1.4 GeV. The planned upgrade [2] of the VEPP-2M collider facility will increase the luminosity of the machine from 5 × 10 30 cm −2 s −1 up to 2 × 10 31 −10 32 . The expected increase in data rates is beyond the capacity of the operational data acquisition system (DAQ) and necessitates the design of a new system.
115431787
New technologies for the Pierre Auger Observatory: Research and development in southeastern Colorado
The Pierre Auger Research and Development Array is conceived as a test bed aiming at validating an improved and more cost-effective one-photomultiplier surface detector design and a new communication system. The array of ten surface detectors and ten communication-only stations is currently being deployed in southeastern Colorado and will be operated at least until mid-2012. It is configured in such a way to allow testing of the peer-to-peer communication protocol and the new surface detector electronics that features an enhanced dynamic range aimed at reducing the distance from the shower core where saturation is observed. Atmospheric monitoring developments are also ongoing at the site and are presented in a separate paper. These developments are expected to improve the performances of the southern site of the Pierre Auger Observatory and enable future enhancements.
42616403
Fission fragment mass and energy distributions as a function of incident neutron energy measured in a lead slowing-down spectrometer
A new method of measuring fission fragment mass and energy distributions as a function of incident neutron energy in the range from below 0.1 eV to 1 keV has been developed. The method involves placing a double-sided Frisch-gridded fission chamber in Rensselaer Polytechnic Institute's lead slowing-down spectrometer (LSDS). The high neutron flux of the LSDS allows for the measurement of the energy-dependent, neutron-induced fission cross sections simultaneously with the mass and kinetic energy of the fission fragments of various small samples. The samples may be isotopes that are not available in large quantities (submicrograms) or with small fission cross sections (microbarns). The fission chamber consists of two anodes shielded by Frisch grids on either side of a single cathode. The sample is located in the center of the cathode and is made by depositing small amounts of actinides on very thin films. The chamber was successfully tested and calibrated using 0.41+-0.04 ng of {sup 252}Cf and the resulting mass distributions were compared to those of previous work. As a proof of concept, the chamber was placed in the LSDS to measure the neutron-induced fission cross section and fragment mass and energy distributions of 25.3+-0.5 mug of {sup 235}U. Changes inmore » the mass distributions as a function of incident neutron energy are evident and are examined using the multimodal fission mode model.« less
1196260
Fast, long-wavelength scintillators and waveshifters
Studies are presented of new blue-green to red emitting scintillator and waveshifter materials for tracking and calorimetry applications for the detection of ionizing radiation. Materials include plastic scintillators, liquid scintillators, and plastic scintillating and waveshifting fibers. Program goals are to develop faster and more efficient detection media for a variety of experimental applications
121088503
Flux distribution and power loss in the mitered overlap joint in power transformer cores
The design of the joints in a power transformer core has a marked influence on the efficiency of the core as a whole. Two experimental cores have been built such that the lengths of their 45° mitered overlaps could be varied from 0 to 2.0 cm. The larger core, with 1.0 m limbs, was used for investigating flux and loss variations and the second, smaller core was used to study how the results might be affected by changes in dimensions. For the larger core, the power loss was measured in two ways for a range of overlaps: first, using the localized power loss technique, and then by measuring the total power loss with a precision wattmeter. In both cases, a minimum power loss was found when the core was built with an overlap of 0.5 cm. The overlap length was varied in the smaller core and again a minimum power loss was found, but with a 1.0 cm overlap. A change in loss of over 20% was found for the range of overlap lengths used, and the optimum overlap length was independent of flux density over the range from 1.0 T to 1.8 T. The special flux distribution was determined from an array of search coils. The variations in flux distribution enables a qualitative explanation of the occurrence of the minimum in power loss.
119347300
K+ -> pi+ mu+ mu- in E865 at BNL
Preliminary values for the K+ -> pi+ mu+ mu- branching ratio and form factor are reported, based on 400 events, a factor of 2 more in total events and 100 times the present world sample of fully reconstructed events. The results are consistent with previous results on the pi+ e+ e- mode. However, the relatively large slope of the form factor in q^2, lambda = 0.182+/-0.01+/-0.007, required to fit the pi+ e+ e- data and to give consistency between the pi+ e+ e- and pi+ mu+ mu- branching ratios, is larger than expected in simple models of the decays. The K+ -> pi+ mu+ mu- branching ratio we find, (9.23 +/- 0.6 stat +/- 0.58 syst)x10^-8, is the most precise measurement of this mode and is approximately 3.2 sigma larger than the previous measurement. These pi+ l+ l- results are inconsistent with O(p^4) Chiral Perturbation Theory but compatible with O(p^6). Systematic studies for both modes are still in progress.