Mise en évidence de l'isotope ¹⁰⁵In et étude de la désintégration ¹⁰⁵In →¹⁰⁵Cd

Abstract

A l'aide de la réaction loe Cd(p,2n) nous avons pu mettre en évidence un nouvel isotope de l'indium: 105 In. Sa période a été mesurée: 5,1 ± 0,3 min. Il présente un état isomérique (T l/2 = 55 i 5 sec) à 674,1 keV. L'étude des spectres y directs et des coïncidences y-y nous ont permis d'identifier 32 transitions appartenant à la décroissance 105 In -> 105 Cd et de proposer un schéma de niveaux pour 105 Cd. ZusammenfassungEs wurde ein neues Nuklid hergestellt mittels der Reaktion 1M Cd(p,2n) 105 In. Die Halbwertszeit des Grundzustands beträgt 5,1 ± 0,3 min. Es gibt ein Isomer bei 674,1 keV (Γι/, = 55 i 5 sec). 32 Gammaübergänge sind gemessen worden und diese haben, zusammen mit Koinzidenzmessungen, zu einem Zerfallsschema geführt. SummaryA new isotope 105 In was produced by means of the reaction 106 Cd(p,2n). The half-life of the ground state is 5.1 ± 0.3 min. There is an isomeric level at 674.1 keV (T 1/2 = 55 ± 5 sec). Thirty two transitions have been found and a decay scheme has been set up through a study of the y-spectrum and by coïncidence techniques.

Investigation of the? +-decay of105,106,109In and of100,102Ag

“…Energetically such state is predicted by the calculations of [17] at this excitation energy. So the recent I = 7 + assignments by [27,20] to the g.s. According to the rules of [30] for hole-hole coupling, the two lowest-lying states should have U= 3 + and 6 +, in agreement with the (5+,6 + ) assignment ( [22] and this work) to the high spin isomer in 10 Sin .…”

Discovery of the calcium, indium, tin, and platinum isotopes

“…CaO targets were bombarded by 3.1 MeV deuterons at the Yale University cyclotron and proton absorption spectra were recorded. A group of protons with a range of 66 cm was attributed to the formation of 41 Aston observed 42,43 Ca for the first time in 1934 as described in ''Constitution of hafnium and other elements'' [18]. The stable isotopes were identified with an anode discharge tube installed at the Cavendish Laboratory mass spectrograph.…”

“…Rivier and Moret described the 1975 observation of 105 In in ''Mise en evidence de L'isotope 105 In et Etude de la desintegration 105 In → 105 Cd'' [42]. Enriched 106 Cd targets were bombarded with 19-31 MeV protons from the Grenoble variable energy cyclotron.…”

“…Previously assigned half-life values of 25(6) m and 4.6(2) m to 104 In [41] could not be confirmed. 105 In Rivier and Moret describe the 105 In observation of 1975 in "Mise en Evidence de L'isotope 105 In et Etude de la Desintegration 105 In → 105 Cd" [42]. Enriched 106 Cd targets were bombarded with 19-31 MeV protons from the Grenoble variable energy cyclotron.…”

“…42,43 Ca Aston observed42,43 Ca for the first time in 1934: "Calcium Isotopes and the Problem of Potassium" [18]. The relative abundances were measured with a mass spectrograph.…”