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Doctoral Thesis
DOI
10.11606/T.43.1996.tde-28022014-164151
Document
Author
Full name
Ricardo Roberto Plaza Teixeira
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1996
Supervisor
Committee
Lejbman, Iuda Dawid Goldman Vel (President)
Browne, Edgardo
Lima, Celso Luiz
Ribas, Roberto Vicencotto
Saxena, Rajendra Narain
Title in Portuguese
Espectroscopia gama e correlação angular gama-gama em 194Pt
Keywords in Portuguese
Espectroscopia gama
Estrutura nuclear
Abstract in Portuguese
Foram realizadas medidas de espectroscopia gama simples, de espectroscopia. gama-gama em coincidência e de correlação angular para o estudo de 'ANTPOT 194 PT', a partir do decaimento por 'beta POT. +' e por captura eletrônica de 'ANTPOT 194 AU'. Foram determinadas, utilizando um cálculo covariante, as energias e as intensidades de 167 transições gama, das quais 31 pela primeira vez: 212 keV, 243 keV, 304 keV, 338 keV, 363 keV, 366 keV, 373 keV, 398 keV, 421 keV, 436 keV, 500 keV, 602 keV, 627 keV, 699 keV, 807 keV, 814 keV, 857 keV, 901 keV, 1121 keV, 1262 keV, 1346 keV, 1388 keV, 1474 keV, 1488 keV, 1535 keV, 1541 keV, 1565 keV, 1665 keV, 1675 keV, 1775 keV e 1780 keV. O esquema de níveis obtido contém 45 estados; destes estados, 4 foram determinados pela primeira vez: 1373 keV, 1737 keV, 2003 keV e 2140 keV. Foram determinados os valores para as razões de mistura multipolar 'delta'(E2/M1) das transições mais intensas utilizando o método de correlação angular direcional gama-gama. Utilizando elipses de correlação, foi possível determinar ou restringir os valores do spin e/ou paridade de 7 níveis: 1373 keV, 1737 keV, 1778 keV, 1930 keV, 2052 keV, 2134 keV e 2157 keV. Cálculos usando o formalismo de Kumar e Baranger para a resolução do Hamiltoniano de Bohr foram realizados para o núcleo 'ANTPOT 194 PT'. Foram então determinados níveis e propriedades eletromagnéticas e os resultados, discutidos.
Title in English
Gamma spectroscopy and gamma-gamma angular correlation in 194 Pt
Keywords in English
Gamma spectroscopy
Nuclear structure
Abstract in English
Single gamma ray spectroscopy, gamma-gamma spectroscopy and gamma-gamma directional angular correlation have been performed to study the 'ANTPOT 194 PT', following the 'beta POT. + ' decay and electron capture of 'ANTPOT 194 AU'. We have determined, using covariant calculations, energies and intensities of 167 gamma transitions, 31 of them for the first time: 212 keV, 243 keV, 304 keV, 338 keV, 363 keV, 366 keV, 373 keV, 398 keV, 421 keV, 436 keV, 500 keV, 602 keV, 627 keV, 699 keV, 807 keV, 814 keV, 857 keV, 901 keV, 1121 keV, 1262 keV, 1346 keV, 1388 keV, 1474 keV, 1488 keV, 1535 keV, 1541 keV, 1565 keV, 1665 keV, 1675 keV, 1775 keV and 1780 keV. The decay scheme contains 45 levels; 4 of these states have been determined for the first time: 1373 keV, 1737 keV, 2003 keV and 2140 keV. We have also determined values for the multipole rnixing ratios 'delta'(E2/M1) in the case of the strongest transitions, using directional gamma-gamma angular correlation. With the angular correlation ellipses, it was possible to determine or to restrict the spin and/or parity values of 7 levels: 1373 keV, 1737 keV, 1778 keV, 1930 keV, 2052 keV, 2134 keV and 2157 keV.
 
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46155Teixeira.pdf (3.61 Mbytes)
Publishing Date
2014-03-12
 
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