Decay of Sm 153 to Eu 153
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North Holland Publishing
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El decaimiento de Sm 153 a Eu 153 ha sido investigado por medio de un espectrómetro de doble enfoque de yugo de hierro, espectrómetros de coincidencia gamma-gamma y electrón-gamma. Se ha realizado una medida de precisión de la línea de 69.672 keV con un espectrómetro de doble foco libre de hierro. Se midieron las líneas de conversión interna y las líneas fotoeléctricas de las siguientes transiciones y se determinaron sus energías con una precisión de unas pocas partes en 10 : 69,672; 75,34; 83,37; 89,47; 97,45; 103.174; ~ 104,8; 172,85 keV. Se dan intensidades de electrones y gamma de conversión, multipolaridades, relaciones de mezcla y coeficientes de conversión. Utilizando el método de fotoelectrones, se midieron otras 16 transiciones débiles con una resolución de 0,5 % a 0,25 %: 151,5; 411,5; 424,3; 437,7; 449,7; 463,6; 521,3; 531,4; 533.2; 539.1; 555,2; 578,6; 596,9; 603.1; 609.1; 636,0 keV. Se discuten brevemente las dificultades en el cálculo de intensidades de rayos gamma de baja energía a partir de mediciones de conversión externa. Se propone un esquema de decaimiento sobre la base de los datos de energía y un análisis cuantitativo de las coincidencias gamma-gamma y electron gamma. Se han establecido niveles excitados a las siguientes energías: 83,37; 97,45; 103,17; 172,85; (191,4); 634,6; 636,4; (694.3); (706,4) keV.
The decay of Sm 153 to Eu 153 has been investigated by means of an iron yoke double focusing spectrometer, gamma-gamma and electron-gamma coincidence spectrometers. A precision measurement of the 69.672 keV line has been performed with an iron-free double focusing spectrometer. Internal conversion lines and photo-electric lines of the following transitions have been measured and their energies determined with a precision of a few parts in 10 : 69.672; 75.34; 83.37; 89.47; 97.45; 103.174; ~ 104.8; 172.85 keV. Conversion electron and gamma intensities, multipolarities, mixing ratios and conversion coefficients are given. Using the photo-electron method, 16 other weak transitions were measured with a resolution of 0.5 % to 0.25 %: 151.5; 411.5; 424.3; 437.7; 449.7; 463.6; 521.3; 531.4; 533.2; 539.1; 555.2; 578.6; 596.9; 603.1; 609.1; 636.0 keV. Difficulties in the computation of intensities of low energy gamma rays from external conversion measurements are briefly discussed. A decay scheme is proposed on the basis of the energy data and a quantitative analysis of the gamma-gamma and electron gamma coincidences. Excited levels at the following energies have been established: 83.37; 97.45; 103.17; 172.85; (191.4);634.6; 636.4; (694.3); (706.4)keV.
The decay of Sm 153 to Eu 153 has been investigated by means of an iron yoke double focusing spectrometer, gamma-gamma and electron-gamma coincidence spectrometers. A precision measurement of the 69.672 keV line has been performed with an iron-free double focusing spectrometer. Internal conversion lines and photo-electric lines of the following transitions have been measured and their energies determined with a precision of a few parts in 10 : 69.672; 75.34; 83.37; 89.47; 97.45; 103.174; ~ 104.8; 172.85 keV. Conversion electron and gamma intensities, multipolarities, mixing ratios and conversion coefficients are given. Using the photo-electron method, 16 other weak transitions were measured with a resolution of 0.5 % to 0.25 %: 151.5; 411.5; 424.3; 437.7; 449.7; 463.6; 521.3; 531.4; 533.2; 539.1; 555.2; 578.6; 596.9; 603.1; 609.1; 636.0 keV. Difficulties in the computation of intensities of low energy gamma rays from external conversion measurements are briefly discussed. A decay scheme is proposed on the basis of the energy data and a quantitative analysis of the gamma-gamma and electron gamma coincidences. Excited levels at the following energies have been established: 83.37; 97.45; 103.17; 172.85; (191.4);634.6; 636.4; (694.3); (706.4)keV.