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Neutron capture cross section measurements for nuclear astrophysics at CERN n_TOF

A series of neutron capture cross section measurements of interest to nuclear astrophysics have been recently performed at n_TOF, the neutron spallation source operating at CERN. The low repetition frequency of the proton beam driver, the extremely high instantaneous neutron flux, and the low background conditions in the experimental area are optimal for capture cross section measurements on low-mass or radioac...

A low-mass neutron flux monitor for the n _TOF facility at CERN

A small-mass system has been developed for monitoring the flux of neutrons with energy up to 1 MeV at the new time-of-flight facility at CERN, n_TOF. The monitor is based on a thin Mylar foil with a 6Li deposit, placed in the neutron beam, and an array of Silicon detectors, placed outside the beam, for detecting the products of the 6Li(n, alpha)³H reaction. The small amount of material on the beam ensures a min...

Acidifying and aromatic properties of enterococcus strains in ovine and bovine ...

Comparison of continental Portugal and Azores Islands aerosol during a Sahara d...

Copyright © 2002 Elsevier B.V. All rights reserved. ; Airborne particulate matter plays an important role in the Earth's energy balance. One of the main reasons is that the real size of a significant number of the particles, mainly those of anthropogenic origin, is similar to the wavelength of visible light. Knowledge of the composition of such particles, as well as their dynamics and trajectories in the atmos...

Analysis of Atmospheric Aerosols Using the Lisbon Nuclear Micropore

Proceedings of the XXXVI Zakopane School of Physics, Zakopane 2001. ; Copyright © 2001 Polish Academy of Sciences. ; The nuclear microprobe installed at Instituto Tecnológico e Nuclear, in Lisbon, was used in the analysis of aerosols collected at the Azores islands. Samples from two different aerosol groups were analysed. One referred to aerosols that were carried from North America and the other one containe...

Physical, structural and mechanical characterization of Ti1-xSixNy films

Within the frame of this work, Ti1-xSixNy hard coatings with 0<=x<=0.37 and thicknesses ranging from 1.2 to 3.5 [mu]m, were prepared by r.f. reactive magnetron sputtering in an Ar/N2 gas mixture. X-ray diffraction and Fourier analysis of X-ray profiles were used to investigate the structure and grain size, and its correlation with hardness behaviour, as a function of the Si content, bias voltage and working gas...

Physical and mechanical properties of Ti1 - xSixN films

Ti1 - xSixN coatings with 0 <- x <- 0.30 and thicknesses ranging from 1.2 to 3.3 [mu]m, were deposited on to polished high-speed steel substrates by r.f. reactive magnetron sputtering. The atomic composition of the samples was measured by Rutherford backscatering spectrometry (RBS), and the texture was determined by X-ray diffraction (XRD). Great improvements in hardness and adhesion behaviour were obtained whe...