Measurement of the Atmospheric Muon Spectrum from 20 to 3000 GeV

The absolute muon flux between 20 GeV and 3000 GeV is measured with the L3 magnetic muon spectrometer for zenith angles ranging from 0 degree to 58 degree. Due to the large exposure of about 150 m2 sr d, and the excellent momentum resolution of the L3 muon chambers, a precision of 2.3 % at 150 GeV in the vertical direction is achieved. The ratio of positive to negative muons is studied between 20 GeV and 500 GeV, and the average vertical muon charge ratio is found to be 1.285 +- 0.003 (stat.) +- 0.019 (syst.).Comment: Total 32 pages, 9Figure

A search for flaring Very-High-Energy cosmic-ray sources with the L3+C muon spectrometer

The L3+C muon detector at the Cern electron-position collider, LEP, is used for the detection of very-high-energy cosmic \gamma-ray sources through the observation of muons of energies above 20, 30, 50 and 100 GeV. Daily or monthly excesses in the rate of single-muon events pointing to some particular direction in the sky are searched for. The periods from mid July to November 1999, and April to November 2000 are considered. Special attention is also given to a selection of known \gamma-ray sources. No statistically significant excess is observed for any direction or any particular source

Measurement of the Shadowing of High-Energy Cosmic Rays by the Moon: A Search for TeV-Energy Antiprotons

The shadowing of high-energy cosmic rays by the Moon has been observed with a significance of 9.4 standard deviations with the L3+C muon spectrometer at CERN. A significant effect of the Earth magnetic field is observed. Since no event deficit on the east side of the Moon has been observed, an upper limit at 90% confidence level on the antiproton to proton ratio of 0.11 is obtained for primary energies around 1 TeV

Is elderly migration absent in the Netherlands?

The classical patterns in elderly migration, showing a retirement peak and an upward slope at higher ages in the migration age profile and showing a redistribution of the elderly population from urbanised regions towards more rural and coastal areas, are absent in the Netherlands. However, a more in-depth, multivariate analysis shows, that the basic processes underlying elderly migration are also at work in the Netherlands. Due to the specific social and geographical context which include among others a very diffuse age of retirement and a very dispersed pattern of recreational and housing amenities, the processes do not lead to the common age-specificity and geographical distribution in the migration of the elderly.La migration de retraite est-elle absente aux Pays-Bas ? II y a deux formes très connues de migration des personnes âgées. L'une montre un pic à l'âge de la retraite, l'autre une augmentation de la mobilité locale des retraités plus âgés. En outre, les lieux d'installation de la migration de retraite passent des zones urbaines aux milieux campagnards et aux stations littorales. Ces formes de mobilité des retraités sont absentes aux Pays-Bas. Néanmoins, une analyse multivariée approfondie montre que les processus de base de la migration des retraités existent aussi dans ce pays. L'âge diffus de la retraite et les formes très diverses des aménités récréatives et résidentielles aux Pays-Bas ne répondent pas aux modèles évidents de mobilité locale des retraités, observés dans d'autre pays.Hooimeijer Pieter, Dieleman Frans M., Kuijpers-Linde Marianne. Is elderly migration absent in the Netherlands? . In: Espace, populations, sociétés, 1993-3. Les migrations de personnes âgées en Europe - Migration among the elderly in Europe. pp. 465-476