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Search for superheavy elements in nature
Stephan C., Tys J., Sowinski M., Cieslak E., Meunier M.
Journal de Physique 36, 2 (1975) 105-112 - http://hal.archives-ouvertes.fr/jpa-00208233
Physique/Articles anciens
Physique/Physique/Instrumentations et Détecteurs
Search for superheavy elements in nature
C. Stephan1, J. Tys1, M. Sowinski, E. Cieslak, M. Meunier2
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud
IPN - 15, rue Georges Clemenceau - 91406 ORSAY CEDEX
2 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
CNRS : UMR8609 – IN2P3 – Université Paris XI - Paris Sud
batiments 104 et 108 - 91405 Orsay Campus
Superheavy elements have been searched for by neutron induced fission of mass separated samples. Various natural materials have been investigated : minerals, manganese nodules, lunar dust, meteoritic materials. Fissioning masses have been collected in the A = 300 mass region. However, one cannot conclude that these masses are superheavy elements because of a possible contamination of this mass region by molecules containing natural uranium or thorium. To test for this possibility, the ratios of fast to thermal neutron events have been determined in each separated mass region. These ratios cannot be completely understood as due to the fission of U or Th atoms. Some complementary results concerning the properties of the atoms contained in these masses are also given.

Journal de Physique
non spécifiée
Articles dans des revues avec comité de lecture

lunar rocks and minerals – manganese – meteorites – nuclear fission products – nuclear reactions and scattering due to neutrons – superheavy nuclei

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