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Fission of atomic nuclei studies is one of the main problems of the modern nuclear physics. Quasifission is considered to be one of the competing processes for fusion-fission of heavy and superheavy nuclei, preventing the formation of the complex compound nuclei. These two mechanisms are being governed by the shell effects [1-4].
The following work is dedicated to experimental studies of fusion-fission and quasifission mechanisms in $^{40,48}$Ca+$^{208}$Pb at energies around the Coulomb barrier. Such choice of reactions is determined by the existence of $Z=20$, $N=20$, $N=28$ closed shells in calcium isotopes. The experiment was carried out at the U-400 accelerator in FLNR JINR. Mass and total kinetic energy (MTKE) distributions were measured with the use of double-arm time-of-flight spectrometer CORSET.
In this work we presented MTKE distributions for fusion-fission and quasifission processes in reactions $^{40,48}$Ca+$^{208}$Pb at incident energies 197.5-222 MeV for $^{40}$Ca and 208-281 MeV for $^{48}$Ca. It was also shown how the contribution of fusion-fission and quasifission processes change with the excitation energy.
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| Section | Experimental and theoretical studies of nuclear reactions |
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