194 research outputs found
Measurement of the flux of atmospheric muons with the CAPRICE94 apparatus
A new measurement of the momentum spectra of both positive and negative muons
as function of atmospheric depth was made by the balloon-borne experiment
CAPRICE94. The data were collected during ground runs in Lynn Lake on the
19-20th of July 1994 and during the balloon flight on the 8-9th of August 1994.
We present results that cover the momentum intervals 0.3-40 GeV/c for negative
muons and 0.3-2 GeV/c for positive muons, for atmospheric depths from 3.3 to
1000 g/cm**2, respectively. Good agreement is found with previous measurements
for high momenta, while at momenta below 1 GeV/c we find latitude dependent
geomagnetic effects. These measurements are important cross-checks for the
simulations carried out to calculate the atmospheric neutrino fluxes and to
understand the observed atmospheric neutrino anomaly.Comment: 28 pages, 13 Postscript figures, uses revtex.sty, to appear in Phys.
Rev.
Silicon calorimeter for cosmic antimatter search
Abstract The silicon sampling calorimeter presented is conceived as a fine grained imaging device to carry out studies of the anti-matter component in the primary cosmic radiation; it will be used in balloon payload program starting in 1993. The first sampling layer (48Ă48 cm2) of this silicon calorimeter has been completed and successfully tested. We report the first results form studies performed at the CERN PS t7 beam. The complete calorimeter contains 20 xy sampling layers (strip pitch 3.6 mm) interleaved with 19 showering material planes (tungsten 0.5 X0). This allows to picture the transverse distributions of the shower in both coordinates at each sampling. The outstanding imaging capabilities reflects in high particle identification power. Preliminary results from beam tests performed with antiprotons at 3.5 GeV on a tower prototype of the calorimeter are reported
ĐŁĐżŃĐ°ĐČĐ»Đ”ĐœĐžĐ” ŃĐžŃŃĐ”ĐŒĐŸĐč ŃлДĐșŃŃĐŸŃ ĐžĐŒĐžŃĐ”ŃĐșĐŸĐč Đ·Đ°ŃĐžŃŃ ĐŒĐ°ĐłĐžŃŃŃĐ°Đ»ŃĐœĐŸĐłĐŸ ĐłĐ°Đ·ĐŸĐżŃĐŸĐČĐŸĐŽĐ° ĐČ ŃŃĐ»ĐŸĐČĐžŃŃ ĐČĐ”ŃĐœĐŸĐč ĐŒĐ”ŃĐ·Đ»ĐŸŃŃ
ĐбŃĐ”ĐșŃĐŸĐŒ ĐžŃŃĐ»Đ”ĐŽĐŸĐČĐ°ĐœĐžŃ ĐżĐŸĐŽŃĐžŃŃĐ”ĐŒĐ° ĐșĐŸŃŃĐŸĐ·ĐžĐŸĐœĐœĐŸĐłĐŸ ĐŒĐŸĐœĐžŃĐŸŃĐžĐœĐłĐ° ŃлДĐșŃŃĐŸŃ
ĐžĐŒĐžŃĐ”ŃĐșĐŸĐč Đ·Đ°ŃĐžŃŃ ĐŒĐ°ĐłĐžŃŃŃĐ°Đ»ŃĐœĐŸĐłĐŸ ĐłĐ°Đ·ĐŸĐżŃĐŸĐČĐŸĐŽĐ°. ĐŠĐ”Đ»Ń ŃĐ°Đ±ĐŸŃŃ â ĐżŃĐŸĐ°ĐœĐ°Đ»ĐžĐ·ĐžŃĐŸĐČĐ°ŃŃ ŃĐżŃĐ°ĐČĐ»Đ”ĐœĐžĐ” ŃĐžŃŃĐ”ĐŒĐŸĐč ŃлДĐșŃŃĐŸŃ
ĐžĐŒĐžŃĐ”ŃĐșĐŸĐč Đ·Đ°ŃĐžŃŃ ĐŒĐ°ĐłĐžŃŃŃĐ°Đ»ŃĐœĐŸĐłĐŸ ĐłĐ°Đ·ĐŸĐżŃĐŸĐČĐŸĐŽĐ° ĐČ ŃŃĐ»ĐŸĐČĐžŃŃ
ĐČĐ”ŃĐœĐŸĐč ĐŒĐ”ŃĐ·Đ»ĐŸŃŃ. Đ ŃДзŃĐ»ŃŃĐ°ŃĐ” Đ°ĐœĐ°Đ»ĐžĐ·Đ° ŃŃŃĐ°ĐœĐŸĐČĐ»Đ”ĐœĐŸ, ŃŃĐŸ ĐĐĐ-йХй-ĐĐŸĐœŃĐĐŸŃŃ ŃĐŽĐŸĐČлДŃĐČĐŸŃŃĐ”Ń ŃŃĐ”Đ±ĐŸĐČĐ°ĐœĐžŃĐŒ ŃĐžŃŃĐ”ĐŒŃ ŃĐżŃĐ°ĐČĐ»Đ”ĐœĐžŃ ŃĐ”Ń
ĐœĐžŃĐ”ŃĐșĐžĐŒ ŃĐŸŃŃĐŸŃĐœĐžĐ”ĐŒ Đž ŃĐ”Đ»ĐŸŃŃĐœĐŸŃŃŃŃ ĐżĐ»ĐŸŃĐ°ĐŽĐœŃŃ
ĐŸĐ±ŃĐ”ĐșŃĐŸĐČ ĐŸŃĐłĐ°ĐœĐžĐ·Đ°ŃОО.The object of study is the subsystem of corrosion monitoring of electrochemical protection of the main gas pipeline. The purpose of the work is to analyze the management of the system of electrochemical protection of the main gas pipeline in permafrost conditions. As a result of the analysis, it was established that PKM-TST-KontKorr satisfies the requirements of the system for managing the technical condition and integrity of the organizationâs area facilities
Search for non-minimal Higgs bosons in Z 0 decays
We report on a search for the neutral and charged Higgs bosons predicted by models of spontaneous symmetry breaking with more than one Higgs doublet field. No signals are observed. We set model-independent limits on masses or branching ratios of singly and pair-produced neutral and charged Higgs bosons. In addition, we interpret our results in the framework of a general two-doublet Higgs model and the Minimal Supersymmetric extension of the Standard Model.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/47892/1/10052_2005_Article_BF01474331.pd
Measurement of electroweak parameters from hadronic and leptonic decays of the Z 0
We have studied the reactions e + e â âhadrons, e + e â , ÎŒ + ÎŒ â and Ï + Ï â , in the energy range 88.2 GeV. A total luminosity of 5.5 pb â1 , corresponding to approximately 115000 hadronic and 10000 leptonic Z 0 decays, has been recorded with the L3 detector. From a simultaneous fit to all of our measured cross section data, we obtain assuming lepton universality:Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/47890/1/10052_2005_Article_BF01475788.pd
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