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 ¼ 120 compound nuclei. The filling of these vacancies accompanied by a 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 tf=2.5X10^-18 s has been deduced for Z =120 from the measured x-ray multiplicity.
X-ray fluorescence from the element with atomic number Z=120 / Frã©geau, M. O.; Jacquet, D.; Morjean, M.; Bonnet, E.; Chbihi, A.; Frankland, J. D.; Rivet, M. F.; Tassan-got, L.; Dechery, F.; Drouart, A.; Nalpas, L.; Ledoux, X.; Parlog, M.; Ciortea, C.; Dumitriu, D.; Fluerasu, D.; Gugiu, M.; Gramegna, F.; Kravchuk, V. L.; Marchi, T.; Fabris, D.; Corsi, A.; Barlini, Sandro. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - ELETTRONICO. - 108:(2012), pp. 0-0. [10.1103/PhysRevLett.108.122701]
X-ray fluorescence from the element with atomic number Z=120
Barlini, S.
2012
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 ¼ 120 compound nuclei. The filling of these vacancies accompanied by a 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 tf=2.5X10^-18 s has been deduced for Z =120 from the measured x-ray multiplicity.File | Dimensione | Formato | |
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