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 Physical Review Letters 108 (2012) 122701
 X-ray fluorescence from the element with atomic number Z = 120
 (2012)
 An atomic clock based on X-ray fluorescence yields has been used to estimate the mean characteristic time for fusion followed by fission in reactions 238U + 64Ni at 6.6 MeV/A. Inner shell vacancies are created during the collisions in the electronic structure of the possibly formed Z=120 compound nuclei. The filling of these vacancies accompanied by X-ray emission with energies characteristic of Z=120 can take place only if the atomic transitions occur before nuclear fission. Therefore, the X-ray yield characteristic of the united atom with 120 protons is strongly related to the fission time and to the vacancy lifetimes. K X-rays from the element with Z = 120 have been unambiguously identified from a coupled analysis of the involved nuclear reaction mechanisms and of the measured photon spectra. A minimum mean fission time $\tau$_f\$ = 2.5×10−18s has been deduced for Z=120 from the measured X-ray multiplicity.
 équipe(s) de recherche : Dynamique et thermodynamique nucléaire
 Thème(s) : Physique/Physique Nucléaire Expérimentale
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 in2p3-00660911, version 1 http://hal.in2p3.fr/in2p3-00660911 oai:hal.in2p3.fr:in2p3-00660911 Contributeur : Michel Lion <> Déposé pour le compte de : Maurice Morjean <> Soumis le : Mercredi 18 Janvier 2012, 09:16:56 Dernière modification le : Mercredi 26 Février 2014, 11:07:08