2201 12. 6-nor-6-AthyZ-9,lO-dihydrolysergsaure-Summary. Several isopropylidene-, benzylidene-and benzhydrylidene-norbornadiene derivatives (11, 16) have been synthesized. The [2n+2n] cycloadditions leading to the tetracyclic isomers 12 and 17 resp. upon direct photoexcitation proceed practically quantitatively in the case of the trienes 11, much less specifically, however, with 16. Sensitization by acetone or fluorenone allows the isolation of the quadricyclanes 17 in 20-90~o yields.
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.
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