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Pascholati, P.R.
Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro1973
Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro1973
AbstractAbstract
[en] The time-dependent electron spectra of fission fragments from the thermal-neutron-induced fission of 235U are calculated. The Gross theory of nuclear beta decay is used to obtain the decay constant and individual electron spectra. The mean energy per fission carried by the electrons and the number of electrons per fission are also calculated. Comparison of these calculated spectra to experimental ones shows good agreements. (Author)
[pt]
Os espectros de eletrons atrasados de produtos de fissao do 235U, induzida por neutrons termicos, sao calculados. E utilizada a 'Gross Theory' para o calculo das constantes de decaimento e espectro de eletrons individuais. O numero de eletrons e a energia media por eles carregada por fissao, e tambem calculada. Comparacao dos espectros calculados com os experimentais evidenciam boa concordancia. (Autor)Original Title
Espectro retardado de raios β em fragmentos de fissao do 235U
Primary Subject
Source
1973; 79 p; Tese (M.Sc.).
Record Type
Miscellaneous
Literature Type
Thesis/Dissertation
Report Number
Country of publication
ACTINIDE NUCLEI, ALPHA DECAY RADIOISOTOPES, BARYONS, DECAY, ELEMENTARY PARTICLES, EVALUATION, EVEN-ODD NUCLEI, FERMIONS, HADRONS, HEAVY NUCLEI, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, MINUTES LIVING RADIOISOTOPES, NEUTRONS, NUCLEAR DECAY, NUCLEAR FRAGMENTS, NUCLEI, NUCLEONS, RADIOISOTOPES, SPECTRA, URANIUM ISOTOPES, YEARS LIVING RADIOISOTOPES
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AbstractAbstract
[en] The most important characteristics of fusion reactions below and around the Coulomb-barrier are summarized. Experimental fusion cross sections for typical systems are discussed and compared with current formulae obtained from semi-classical and quantum tunneling approaches. The influence of nucleons transfer in the enhancement of the fusion cross section below the Coulomb-barrier is also shown. Sub-barrier fusion cross sections for the systems 35,37Cl + 58,64Ni and 33S + 90,91,92Zr, and near-barrier cross sections of all important transfer channels have been measured using the XTU-TANDEM at Legnaro, Italy. In 35,37Cl + 58,64Ni systems, the motivation further investigated was the influence of the valence proton in the enhancement of the sub-barrier fusion cross section. The data are discussed in comparison with the similar data of 34,36S + 58,64Ni with the aim of revealing the influence of coupled proton transfer channels. Calculations were performed using the simplified coupled channel code CCFUS including ''pick-up'' of one and two neutrons and ''stripping'' of two neutrons channels. Signatures of positive Q-values transfer channels coupled to fusion were clearly identified. For the 33S + 90,91,92Zr systems taking into account the coupling effects between transfer and fusion and using the semi-classical approach, transfer form-factors were extracted and succesfully employed to described the isotopic effects in fusion enhancement. (Author)
[es]
Se resumen las caracteristicas mas importantes de las reacciones de fusion por debajo y cercanas a las barrera Coulombiana. Las secciones eficaces de fusion experimentales son discutidas y comparadas con formulas corrientes obtenidas a partir de aproximaciones semi-clasicas y de penetracion cuantica. La influencia de la transferencia de nucleones en el incremento de la seccion eficaz de fusion por debajo de la barrera Coulombiana tambien se muestra con algunos ejemplos. Se midieron las secciones eficaces de fusion para los sistemas 35,37Cl + 58,64Ni y 33S + 90,91,92Zr por debajo de la barrera Coulombiana y las secciones eficaces de transferencia alrededor de la barrera Coulombiana para todos los canales relevantes en los sistemas 33S + 90,91,92Zr. Los datos se obtuvieron usando el acelerador TANDEM-XTU del Laboratorio de Legnaro, Italia. El objetivo era estudiar la influencia del proton de valencia en el incremento de la seccion eficaz de fusion sub-coulombiana para los sistemas 35,37Cl + 58,64Ni. Los datos se discuten y se comparan con datos similares de los sistemas 34,36S + 58,64Ni para revelar la influencia de los canales acoplados en la transferencia de un proton. Los calculos fueron realizados con el codigo de canales acoplados simplificado CCFUS incluyendo canales de reacciones de ''pick-up'' de uno y dos neutrones y de reacciones de ''stripping'' de dos neutrones. Signaturas para valores de G positivos en los canales acoplados a fusion son claramente identificados. Teniendo en cuenta los efectos del acoplamiento entre los canales de transferencia y fusion y usando la aproximacion semi-clasica se obtuvieron factores de forma para los sistemas 33S + 90,91,92Zr. Estos fueron exitosamente empleados para describir los efectos isotopicos en el incremento de la fusion. (Autor)Original Title
Fusion y transferencia de particulas cercanas a la barrera Coulombiana en sistemas intermedios
Primary Subject
Source
Comision Nacional de Energia Atomica, Buenos Aires (Argentina). Dept. de Fisica; 299 p; 1989; p. 89-104; Workshop on nuclear physics; 11. Reunion de trabajo en fisica nuclear; Buenos Aires (Argentina); 23-26 Aug 1988; Also available from Comision Nacional de Energia Atomica, Buenos Aires (AR)
Record Type
Miscellaneous
Literature Type
Conference; Numerical Data
Report Number
Country of publication
LanguageLanguage
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INIS VolumeINIS Volume
INIS IssueINIS Issue
Pascholati, P.R.; Oliveira, R.A.A.M. de; Goldman, I.D.
Sao Paulo Univ., SP (Brazil). Inst. de Fisica1988
Sao Paulo Univ., SP (Brazil). Inst. de Fisica1988
AbstractAbstract
[en] A multipole mixing ratio of 3.9(9) of the 2+2 - 2+1 616 KeV transition in 80Kr was determined by gamma-gamma angular correlation using a Ge(Li)-NaI(T1) spectrometer. Previous measurements of this mixing ratio with results 6(1), -0.5, 3(3) and 16∞-8 are not in mutual agreement. Available conversion electron coefficient data can not explain the δ-value. (author)
[pt]
A taxa de combinacao de multipolos de 3.9(9) da transicao 2+2 - 2-1 em 616 KeV em 80Kr foi determinada por correlacao angular gama-gama usando-se um expectrometro de Ge(Li)-NaI(T1). Medidas previas desta taxa de combinacao com resultados de 6(1), -0.5, 3(3) e 16∞-8 nao estao em acordo. Os dados avaliaveis do coeficiente de conversao de eletrons nao explicam o valor δ. (M.C.K.)Primary Subject
Source
Nov 1988; 11 p
Record Type
Report
Report Number
Country of publication
CORRELATIONS, EVEN-EVEN NUCLEI, GE SEMICONDUCTOR DETECTORS, INTERMEDIATE MASS NUCLEI, ISOTOPES, KRYPTON ISOTOPES, LI-DRIFTED DETECTORS, MEASURING INSTRUMENTS, NUCLEI, RADIATION DETECTORS, RADIOACTIVITY LOGGING, SCINTILLATION COUNTERS, SEMICONDUCTOR DETECTORS, SOLID SCINTILLATION DETECTORS, STABLE ISOTOPES, WELL LOGGING
Reference NumberReference Number
INIS VolumeINIS Volume
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Kodama, T.; Pascholati, P.R.
Proceedings of the International Conference on Nuclear Physics held at Munich, Germany, 27 Aug - 1 Sep 19731973
Proceedings of the International Conference on Nuclear Physics held at Munich, Germany, 27 Aug - 1 Sep 19731973
AbstractAbstract
No abstract available
Primary Subject
Source
Boer, J. de; Mang, H.J. (eds.); v. 1 p. 691; ISBN 0720402808; ; 1973; North-Holland Publishing Company; Amsterdam; International conference on nuclear physics; Munich, Germany; 27 Aug 1973; Short communication only.
Record Type
Book
Literature Type
Conference
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Siqueira, P.T.D.; Pascholati, P.R.; Vanin, V.R.
15. Workshop on Nuclear Physics in Brazil: program and abstracts1992
15. Workshop on Nuclear Physics in Brazil: program and abstracts1992
AbstractAbstract
[en] Short communication
Original Title
Determinacao de tracos de elementos pesados em material organico por fluorescencia de raio-X
Primary Subject
Source
Sociedade Brasileira de Fisica, Rio de Janeiro, RJ (Brazil); 75 p; 1992; p. 42; 15. Workshop on Nuclear Physics in Brazil; 15. Reuniao de Trabalho sobre Fisica Nuclear no Brasil; Caxambu, MG (Brazil); 8-12 Sep 1994; Available from the Nuclear Information Center of CNEN/RJ, BR
Record Type
Miscellaneous
Literature Type
Conference
Country of publication
BETA DECAY RADIOISOTOPES, CADMIUM ISOTOPES, CHEMICAL ANALYSIS, ELECTRON CAPTURE RADIOISOTOPES, ELEMENTS, ENERGY RANGE, ENERGY-LEVEL TRANSITIONS, EVEN-ODD NUCLEI, INTERMEDIATE MASS NUCLEI, ISOTOPES, KEV RANGE, MATHEMATICS, MATTER, METALS, NONDESTRUCTIVE ANALYSIS, NUCLEI, RADIATION SOURCES, RADIOISOTOPES, X-RAY EMISSION ANALYSIS, YEARS LIVING RADIOISOTOPES
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AbstractAbstract
[en] Indoor gamma-ray background spectra in the interval from 100 keV to 2800 keV were recorded with an unshielded HPGe detector of 155 cm3 of volume. Lines with count rates greater than 3 X 10-3 cps were identified. (author). 7 refs., 7 figs., 2 tabs
Record Type
Journal Article
Journal
Country of publication
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INIS VolumeINIS Volume
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Ejnisman, R.; Goldman, I.; Pascholati, P.R.
Proceedings of the 16. Workshop on Nuclear Physics in Brazil. Abstracts1993
Proceedings of the 16. Workshop on Nuclear Physics in Brazil. Abstracts1993
AbstractAbstract
[en] Short communication
Original Title
Producao de um alvo de 44 Ti e sua secao de choque para captura de neutrons termicos
Primary Subject
Source
Sociedade Brasileira de Fisica, Sao Paulo, SP (Brazil); 128 p; 1993; p. 70; 16. Workshop on Nuclear Physics in Brazil; Serra Negra, SP (Brazil); 8-12 Sep 1993; Available from the Nuclear Information Center of Comissao Nacional de Energia Nuclear, RJ, BR
Record Type
Miscellaneous
Literature Type
Conference
Country of publication
BARYON REACTIONS, BARYON-BARYON INTERACTIONS, BARYONS, BETA DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, DAYS LIVING RADIOISOTOPES, ELECTRON CAPTURE RADIOISOTOPES, ELEMENTARY PARTICLES, ELEMENTS, EVEN-EVEN NUCLEI, FERMIONS, HADRON REACTIONS, HADRON-HADRON INTERACTIONS, HADRONS, HEAVY ION REACTIONS, HOURS LIVING RADIOISOTOPES, INTERACTIONS, INTERMEDIATE MASS NUCLEI, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, METALS, NEUTRONS, NUCLEI, NUCLEON REACTIONS, NUCLEON-NUCLEON INTERACTIONS, NUCLEONS, ODD-EVEN NUCLEI, ODD-ODD NUCLEI, PARTICLE INTERACTIONS, PHYSICS, PROTON-NUCLEON INTERACTIONS, RADIOISOTOPES, SCANDIUM ISOTOPES, STABLE ISOTOPES, TARGETS, TITANIUM ISOTOPES, TRANSITION ELEMENTS, YEARS LIVING RADIOISOTOPES
LanguageLanguage
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Related RecordRelated Record
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Rosa, M.C.S.; Pinto, R.D.; Vanin, V.R.; Pascholati, P.R.
15. Workshop on Nuclear Physics in Brazil: program and abstracts1992
15. Workshop on Nuclear Physics in Brazil: program and abstracts1992
AbstractAbstract
[en] Short communication
Original Title
Sistema de aquisicao multidetetor
Source
Sociedade Brasileira de Fisica, Rio de Janeiro, RJ (Brazil); 75 p; 1992; p. 42; 15. Workshop on Nuclear Physics in Brazil; 15. Reuniao de Trabalho sobre Fisica Nuclear no Brasil; Caxambu, MG (Brazil); 8-12 Sep 1994; Available from the Nuclear Information Center of CNEN/RJ, BR
Record Type
Miscellaneous
Literature Type
Conference
Country of publication
LanguageLanguage
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INIS VolumeINIS Volume
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AbstractAbstract
No abstract available
Original Title
Linhas de baixa intensidade do Al29
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. 300
Country of publication
LanguageLanguage
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Amaku, M.; Pascholati, P.R.; Vanin, V.R.
17. Workshop on Nuclear Physics in Brazil: program and abstracts1994
17. Workshop on Nuclear Physics in Brazil: program and abstracts1994
AbstractAbstract
[en] Short communication
Original Title
Estudo do decaimento do 74 As
Primary Subject
Secondary Subject
Source
Sociedade Brasileira de Fisica, Rio de Janeiro, RJ (Brazil); 73 p; 1994; p. 43; 17. Workshop on Nuclear Physics in Brazil; 17. Reuniao de Trabalho sobre Fisica Nuclear no Brasil; Angra dos Reis, RJ (Brazil); 7-11 Sep 1994; Available from the Nuclear Information Center of CNEN/RJ, BR
Record Type
Miscellaneous
Literature Type
Conference; Numerical Data
Country of publication
ARSENIC 74, ARSENIC 75 TARGET, BRAZIL, BREMSSTRAHLUNG, COINCIDENCE SPECTROMETRY, ELECTRON BEAMS, ENERGY-LEVEL TRANSITIONS, EXPERIMENTAL DATA, GAMMA DECAY, GAMMA SOURCES, GAMMA SPECTROSCOPY, HALF-LIFE, HIGH-PURITY GE DETECTORS, LINEAR ACCELERATORS, MEV RANGE 10-100, NEUTRONS, NUCLEAR STRUCTURE, PHOTONUCLEAR REACTIONS
ACCELERATORS, ARSENIC ISOTOPES, BARYONS, BEAMS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, COINCIDENCE METHODS, COUNTING TECHNIQUES, DATA, DAYS LIVING RADIOISOTOPES, DECAY, DEVELOPING COUNTRIES, ELECTROMAGNETIC RADIATION, ELECTRON CAPTURE RADIOISOTOPES, ELEMENTARY PARTICLES, ENERGY RANGE, FERMIONS, GE SEMICONDUCTOR DETECTORS, HADRONS, INFORMATION, INTERMEDIATE MASS NUCLEI, ISOTOPES, LATIN AMERICA, LEPTON BEAMS, MEASURING INSTRUMENTS, MEV RANGE, NUCLEAR DECAY, NUCLEAR REACTIONS, NUCLEI, NUCLEONS, NUMERICAL DATA, ODD-ODD NUCLEI, PARTICLE BEAMS, RADIATION DETECTORS, RADIATION SOURCES, RADIATIONS, RADIOISOTOPES, SEMICONDUCTOR DETECTORS, SOUTH AMERICA, SPECTROSCOPY, TARGETS
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