# X-ray fluorescence from the element with atomic number Z = 120

Abstract : 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.
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Submitted on : Wednesday, January 18, 2012 - 9:16:56 AM
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M.O. Frégeau, D. Jacquet, M. Morjean, E. Bonnet, A. Chbihi, et al.. X-ray fluorescence from the element with atomic number Z = 120. Physical Review Letters, American Physical Society, 2012, 108, pp.122701. ⟨10.1103/PhysRevLett.108.122701⟩. ⟨in2p3-00660911⟩

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