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Freire Junior, F.L.; Montenegro, E.C.; Pinho, A.G. de; Sigaud, G.M.
Pontificia Univ. Catolica do Rio de Janeiro (Brazil). Dept. de Fisica1984
Pontificia Univ. Catolica do Rio de Janeiro (Brazil). Dept. de Fisica1984
AbstractAbstract
[en] Deuteron - and alpha particle - induced K-shell ionisation cross sections for W and Au were obtained from thick-target measurements for low impact velocities. They were compared to proton-induced cross sections in the same range of velocities. Equal-velocity cross sections ratios are a very stringent test to the corrections incorporated to the PWBA calculations. The σd/σp data presented in this paper sheds some light on the Coulomb-deflection corrections discussed in the literature. The consequences of the inelastic character of the ionisation process are thoroughly examined. (Author)
[pt]
Secoes de choque de ionizacao da camada K induzida por deuteron ou particula alfa para W e Au foram obtidas a partir de medidas de espessura de alvos para baixas velocidades de impacto. Elas foram comparadas as secoes de choque induzidas por protons no mesmo intervalo de velocidades. Razoes de secoes de choque de igual velocidade sao testes muito precisos para as correcoes incorporadas aos calculos PWBA. O dado σd/σp apresentado esclarece alguma coisa sobre correcoes de deflexao Coulomb. As consequencias do caracter inelastico do processo de ionizacao completamente analisadas. (M.C.K.)Primary Subject
Source
1984; 13 p
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Report
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Castro Faria, N.V. de; Freire Junior, F.L.; Pinho, A.G. de; Silveira, E.F. da.
Pontificia Univ. Catolica do Rio de Janeiro (Brazil). Dept. de Fisica1982
Pontificia Univ. Catolica do Rio de Janeiro (Brazil). Dept. de Fisica1982
AbstractAbstract
[en] M-subshell ionization cross section of Au, Pb, Bi and U by protons bombardment were obtained over the projectile range 0.3 - 4.0 MeV. X-ray were detected by Si(Li) spectroscopy. At least one characteristic radiative transition line for each M-subshell was isolated and measured. Radiative and non-radiative branching ratios were taken from theoretical calculations of Bhalla and McGuire. Our total production X-ray cross sections are compared with the measurements of other authors. Comparison of our scaled subshell ionization cross sections with calculations in the plane-wave Born approximation shows, in general, good agreement. Uncertainties in fluorescence yields and in super Coster-Kronig coefficients can introduce great imprecision in some experimentally determined subshell ionizations cross sections. (Author)
[pt]
Foram medidas secoes de choque de ionizacao das subcamadas M do Au, Pb, Bi e U por protons com energias entre 0.3 e 4.0 MeV. Essas medidas foram feitas a partir da analise de espectros dos raios-X emitidos pelos atomos apos a ionizacao. Estes espectros foram obtidos com um detetor de Si(Li) de 190 eV de resolucao a 5.9 keV (linha K sub(α) do Fe) e cuidadosamente analisados por metodo grafico desenvolvido no laboratorio. As secoes de choque de producao de raios-X M obtidas sao comparadas com as de outros autores. Comparacoes entre as secoes de choque experimentais de ionizacao das subcamadas e as calculadas na aproximacao de Born de onda plana mostra em geral excelente concordancia. (Autor)Primary Subject
Source
Oct 1982; 26 p
Record Type
Report
Literature Type
Numerical Data
Report Number
Country of publication
ACTINIDES, BARYON REACTIONS, BARYONS, CATIONS, CHARGED PARTICLES, CROSS SECTIONS, DATA, ELECTRONIC STRUCTURE, ELEMENTARY PARTICLES, ELEMENTS, ENERGY RANGE, FERMIONS, HADRON REACTIONS, HADRONS, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, INFORMATION, IONS, KEV RANGE, METALS, MEV RANGE, NUCLEAR REACTIONS, NUCLEON REACTIONS, NUCLEONS, NUMERICAL DATA, SPECTRA, TRANSITION ELEMENTS
Reference NumberReference Number
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AbstractAbstract
[en] Published in summary form only
Source
Almeida Fonseca, A.L. de (Brasilia Univ., DF (Brazil)); Koiler, B. (Pontificia Univ. Catolica do Rio de Janeiro, RJ (Brazil)); Brescansin, L.M. (Universidade Estadual de Campinas, SP (Brazil)) (and others); Sociedade Brasileira de Fisica, Rio de Janeiro, RJ (Brazil); 284 p; 1990; p. 258; 13. National Meeting on Condensed Matter Physics; Caxambu, MG (Brazil); 8-12 May 1990; Available from the Library of Comissao Nacional de Energia Nuclear, RJ, Brazil
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Miscellaneous
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Conference
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Castro Faria, N.V. de; Freire Junior, F.L.; Montenegro, E.C.; Pinho, A.G. de; Silveira, E.F. da.
Pontificia Univ. Catolica do Rio de Janeiro (Brazil). Dept. de Fisica1984
Pontificia Univ. Catolica do Rio de Janeiro (Brazil). Dept. de Fisica1984
AbstractAbstract
[en] Proton-induced K-shell ionisation cross section for W, Au and U by low velocity protons were obtained from thick target measurements. For the first time the lowest incident energy reached a value less than 10 times the binding energy of the K-shell electron (less than 9 times in the case of Au). Possible errors are thoroughly examined and a comparison with other available experimental results and theoretical values is presented and discussed. (Author)
[pt]
Foram obtidos secoes de choque da ionizacao da camada K do W, Au e U por protons com energias entre 0.65 e 3.74 MeV. Os resultados experimentais sao comparados com valores teoricos calculados na aproximacao de Born de onda plana e na aproximacao semi-classica. Em particular, sao discutidas as correcoes de trajetoria, energia de ligacao e relativistica, assim como, o aspecto inelastico de colisoes a baixas velocidades. (Autor)Primary Subject
Source
1984; 16 p
Record Type
Report
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Numerical Data
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AbstractAbstract
[en] Published in summary form only
Original Title
Implantacao ionica em cristais de Naβ''-alumina
Source
Sociedade Brasileira de Fisica, Sao Paulo, SP (Brazil); 201 p; 1991; p. 365; 14. National Meeting on Condensed Matter Physics; Caxambu, MG (Brazil); 7-11 May 1991
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Miscellaneous
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Conference
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Freire Junior, F.L.
Sociedade Brasileira de Fisica (SBF), Sao Paulo, SP (Brazil)2009
Sociedade Brasileira de Fisica (SBF), Sao Paulo, SP (Brazil)2009
AbstractAbstract
No abstract available
Original Title
Materiais nanoestruturados a base de carbono: filmes finos e nanotubos
Source
2009; [1 p.]; 27. Meeting of the North and Northeast physicists; 27. Encontro de fisicos do norte e nordeste; Belem, PA (Brazil); 9-12 Nov 2009
Record Type
Miscellaneous
Literature Type
Conference
Report Number
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CHEMICAL ANALYSIS, COHERENT SCATTERING, DIFFRACTION, ELECTROMAGNETIC RADIATION, ELECTRON MICROSCOPY, ELECTRON SPECTROSCOPY, ELEMENTS, FILMS, IONIZING RADIATIONS, LASER SPECTROSCOPY, MICROSCOPY, NANOSTRUCTURES, NONDESTRUCTIVE ANALYSIS, NONMETALS, PHOTOELECTRON SPECTROSCOPY, RADIATIONS, SCATTERING, SPECTROSCOPY
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AbstractAbstract
[en] The transport of sodium ions through soda-lime glass and Naβ -alumina crystals submitted to 600 keV-proton bombardment was studied. For soda-lime glass, the results can be interpreted as being due to enhanced electric field assisted diffusion of Na+. The order of magnitude of the electric field generated inside the glass a result of the proton bombardment could be experimentally determined and agrees well with theoretical predictions. For Na β - alumina, however, the proton results do not agree with those predicted by the electric field assisted diffusion model. (author). 16 refs, 5 figs
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Journal Article
Journal
Country of publication
ALKALI METALS, ALUMINIUM COMPOUNDS, BARYON REACTIONS, BARYONS, BEAMS, CATIONS, CHARGED PARTICLES, ELECTRICAL EQUIPMENT, ELEMENTARY PARTICLES, ELEMENTS, EQUIPMENT, FERMIONS, HADRON REACTIONS, HADRONS, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, IONS, MATERIALS, METALS, NUCLEAR REACTIONS, NUCLEON BEAMS, NUCLEON REACTIONS, NUCLEONS, OXYGEN COMPOUNDS, PARTICLE BEAMS
Reference NumberReference Number
INIS VolumeINIS Volume
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AbstractAbstract
No abstract available
Original Title
Analise de mecanismos de reacao e dados espectroscopicos sobre os primeiros estados nucleares do 5He e do 5Li
Primary Subject
Source
32. Annual Meeting of the Brazilian Society for the Advancement of Science; Rio de Janeiro, Brazil; 6 - 12 Jul 1980; Published in summary form only.
Record Type
Journal Article
Literature Type
Conference
Journal
Cienc. Cult. (Sao Paulo) Supl; v. 32(7); p. 296
Country of publication
ALPHA DECAY RADIOISOTOPES, BARYONS, CATIONS, CHARGED PARTICLES, DIAGRAMS, ELEMENTARY PARTICLES, ENERGY LEVELS, ENERGY RANGE, FERMIONS, HADRONS, HELIUM IONS, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, INFORMATION, IONS, ISOTOPES, LIGHT NUCLEI, LITHIUM ISOTOPES, MEV RANGE, NUCLEAR REACTIONS, NUCLEI, NUCLEONS, ODD-EVEN NUCLEI, RADIOISOTOPES, SCATTERPLOTS, SECONDS LIVING RADIOISOTOPES, TARGETS
LanguageLanguage
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AbstractAbstract
No abstract available
Original Title
Simulacao por Monte Carlo da transmissao de ions pesados atraves de filmes finos
Primary Subject
Source
35. Annual Meeting of the Brazilian Society for the Advancement of Science; Belem, PA (Brazil); 6-13 Jul 1983; Published in summary form only.
Record Type
Journal Article
Literature Type
Conference
Journal
Cienc. Cult. (Sao Paulo) Supl; v. 35(7); p. 240
Country of publication
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Reference NumberReference Number
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Jacobsohn, L.J.; Capote, G.; Maia da Costa, M.E.H.; Freire Junior, F.L.
12. Annual meeting of the LNLS users - Abstracts2002
12. Annual meeting of the LNLS users - Abstracts2002
AbstractAbstract
No abstract available
Original Title
Estudo de filmes de carbono amorfo hidrogenado e nao-hidrogenado por espalhamento de raios-X a baixo angulo
Source
Laboratorio Nacional de Luz Sincrotron (LNLS), Campinas, SP (Brazil); 275 p; Feb 2002; p. 208; 12. Annual meeting of the LNLS users; 12. Reuniao anual de usuarios do LNLS; Campinas, SP (Brazil); 1-5 Feb 2002; Available from the library of the Brazilian Nuclear Energy Commission, Rio de Janeiro
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Miscellaneous
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