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[en] The α spectrum study of ionium has been resumed using pure isotopic sources. The experimental data confirm the existence of the α 1, 3 and 4 levels, with relative intensities in relatively good agreement with the results obtained by other authors. Other groups are detected for the first time but with a too weak intensity to be confirmed. Reprint of a paper published in 'Compte Rendus des Seances de l'Academie des Sciences', Session of April 5,1954, p. 1496-1498
[en] The fine structure of 234U α spectra has been studied by the impulse ionisation chamber technique, with determination of the energy of the α1 line. A second α0 line is determined at about 170 keV. Reprint of a paper published in 'Comptes Rendus des Seances de l'Academie des Sciences', t. 237, sitting of Dec 21, 1953, p. 1673-1675.
[fr]Etude de la structure fine α de 234U par la technique de la chambre d'ionisation a impulsion. Determination de l'energie de la raie α1. Mise en evidence d'une seconde raie a environ 170 keV de α0. Reproduction d'un article publie dans les 'Comptes Rendus des Seances de l'Academie des Sciences', t. 237, seance du 21 decembre 1953, p. 1673-1675.
[en] The α fine structure low intensity lines of ionium (now thorium 230) have been studied by the pulse ionization chamber method. Two new α0 lines at 210 and 245 keV have been obtained. Reprint of a paper published in 'Comptes Rendus des Seances de l'Academie des Sciences', t. 236, sitting of June 8, 1953, p. 2230.
[fr]Etude des raies de structure fine α de faible intensite de l'ionium par la methode de la chambre d'ionisation a impulsion. Mise en evidence de deux nouvelles raies, a 210 et a 245 keV de α0. Reproduction d'un article publie dans les 'Comptes Rendus des Seances de l'Academie des Sciences', t. 236, seance du 8 juin 1953, p. 2230.
[en] In the first part, it studies an impulse spectrometer of which the resolution and stability have been pushed to their maximum possibilities. It uses an ionization chamber because of its simple and steady functioning. The general characteristics and building of the ionization chamber are described. The electronic devices are described as well as the recording system. The theoretical study of the amplifier has allowed to reduce the amplitude dispersion from electronic devices as background noise. The resolution in energy of an α spectrometer using an impulse ionization chamber is studied and results are discussed. The spectral lines display of the fine structure under the effect of conversion electrons emitted by coincidence in the ionization chamber is studied. Finally, the detection possibilities of very low intensity spectral lines of fine structure of detection are considered. In the second part, the α emission of fine structure of 230Th, 234U and 238U nuclei is studied. (M.P.)