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Featured researches published by J.C. Pineda.


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1990

Energy calibration of a 5.5 MV Van de Graaff accelerator using a time-of-flight technique

E. Andrade; M. Feregrino; E.P. Zavala; J.C. Pineda; R.T. Jimenez; A. Jaidar

Abstract Energy calibration of the analysing magnet for the University of Mexico 5.5 MV Van de Graaff accelerator has been carried out using a time-of-flight method. The pulsed and bunched beam produced by the accelerator was used to deduce the energy E of the beam particles from the transit time between a coaxial pickup and a charged particle detector separated by 1.5 m. The measured FWHM energy resolution of this system was about 20 keV.


Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 1998

IBA analysis of a possible therapeutic ancient tooth inlay

E. Andrade; J.C. Pineda; E.P. Zavala; G. Murillo; R. Chavez; R. Lazcurain; Ma.L. Espinosa; O. Villanueva

Abstract Five pre-Columbian human teeth from the same skeleton found during excavation in an ancient ceremonial center in Mexico, have been analyzed by two conventional Ion Beam Analysis (IBA) techniques: PIXE and 4 He RBS. The anthropologists have estimated that the skeleton is about 2000 years old. X-ray radiography studies of one of these teeth have revealed that they contain an inlay in the tooth crown. The IBA methods have been used to study the inlay materials and also the tooth enamel. The IBA studies show that the tooth inlay materials have almost the same atomic composition as the tooth enamel. These results suggest that the tooth inlay were made for therapeutic purposes, using healthy tooth grains as inlay materials which were glued into the prepared teeth to fill it up.


Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 1998

Characterization of high nitrogen content carbon nitride thin films by RBS and infrared techniques

Juan Manuel Méndez; A. Gaona-Couto; E. Andrade; J.C. Pineda; E.P. Zavala; S. Muhl

Abstract Carbon nitride compounds have attracted much interest due to the predicted superior properties of C 3 N 4 . Carbon nitride thin films have been produced by reactive DC magnetron sputtering and rf PECVD. Of paramount importance to study the growth of CN films is the accurate determination of their composition in order to evaluate whether an ideal phase can be obtained. The film composition and density were obtained using 1.94 MeV 4 He + RBS. The films have been also characterized by FTIR spectroscopy, profilometry and ellipsometry.


Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 1998

ANALYSIS OF MEXICAN OBSIDIANS BY IBA TECHNIQUES

G. Murillo; R. Policroniades; D. Tenorio; B. Méndez; E. Andrade; J.C. Pineda; E.P. Zavala; J.L. Torres

Abstract Motivated by archaeological interest, an interdisciplinary work is presented, which consists of the characterization of obsidian samples from different mineral sites in Mexico, undertaken by Ion Beam Analysis techniques to assess elemental compositions. The oxygen concentration is obtained by means of the 16O(d,p)17O reaction, and other elements, ranging from K to Br, were analyzed by PIXE using an external beam facility. The determination of the Na, Al and Si content were carried out by PIGE analysis, RBS analysis (using alpha particles) was employed to determine the O, Si and Fe concentrations.


Surface & Coatings Technology | 2002

Ion beam analysis of SiCx thin films using a deuterium beam

E. Andrade; A. Mahmood; S. Muhl; E.P. Zavala; J.C. Pineda; L. Huerta

Abstract SiC x thin films have been prepared using RF reactive magnetron sputtering. The deposition parameters were varied over a wide range to optimise the quality of the films. The film atomic density per unit area (atoms/cm 2 ) and composition were obtained by NRA and RBS techniques by bombarding the samples with a low energy deuterium beam. The films were also characterised by X-ray diffraction, FTIR spectroscopy, profilometry and ellipsometry to supplement the RBS and NRA results.


The CAARI 2000: Sixteenth international conference on the application of accelerators in research and industry | 2001

RBS and NRA of cobalt oxide thin films prepared by the sol-gel process

E. Andrade; L. Huerta; E. Barrera; J.C. Pineda; E.P. Zavala; M. F. Rocha; C. A. Vargas

This work presents a study of cobalt oxide thin films produced by the sol-gel process on aluminum and glass substrates. These films have been analyzed using two ion beam analysis (IBA) techniques: a) a standard RBS 4He 2 MeV and b) nuclear reaction analysis (NRA) using a 1 MeV deuterium beam. The 12C(d,p0)13C nuclear reaction provides information that carbon is incorporated into the film structure, which could be associated to the sinterization film process. Other film measurements such as optical properties, XRD, and SEM were performed in order to complement the IBA analysis. The results show that cobalt oxide film coatings prepared by this technique have good optical properties as solar absorbers and potential uses in solar energy applications.


Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 1996

Analysis of coated reflective glasses near the surface using IBA techniques

J.C. Pineda; E. Andrade; J. Rickards; E.P. Zavala

Abstract Commerical coated reflective float glasses with different colors were analyzed near the surface using IBA techniques. The coatings are produced on a large glass plate surface (typically about 2.7 m × 5.5 m) by the ion plasma technique using magnetron sputtering deposition of titanium nitride and stainless steel. Conventional 1.850 MeV alpha particle and 2 MeV proton PIXE analyses were used to measure the film thickness and the stoichiometry of the glass coated films. The RBS technique was also used to analyze the glasses on the uncoated side, and tin diffusion near the surface was observed.


Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 2013

Measurement of L X-ray production cross sections by impact of proton beams on Hf, Ir, and Tl

J. Miranda; G. Murillo; B. Méndez; J. López-Monroy; J. Aspiazu; P. Villaseñor; J.C. Pineda; J. Reyes-Herrera


Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 2007

Chemical effects in the stopping cross sections of protons in rare earth fluorides

J. Miranda; J.C. Pineda


Journal of Radioanalytical and Nuclear Chemistry | 2018

PIXE and XRF elemental analysis of breakfast cereals consumed in Mexico

E. Romero-Dávila; J. Miranda; O.G. de Lucio; J.C. Pineda

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E. Andrade

National Autonomous University of Mexico

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E.P. Zavala

National Autonomous University of Mexico

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J. Miranda

National Autonomous University of Mexico

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L. Huerta

National Autonomous University of Mexico

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O.G. de Lucio

National Autonomous University of Mexico

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S. Muhl

National Autonomous University of Mexico

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A. Gaona-Couto

National Autonomous University of Mexico

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A. Jaidar

National Autonomous University of Mexico

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A. Mahmood

National Autonomous University of Mexico

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