[en] A new approach to the interpretation of the process of spontaneous fission of heavy nuclei is suggested. It is based on nuclear physics data which are obtained in heavy-ion collisions. The process of spontaneous fission consists of three sequential stages: clusterization of the valent nucleons of a heavy nucleus into a light nucleus-cluster, which leads to the formation of a dinuclear system; evolution of the dinuclear system which proceeds by nucleon transfer from the heavy to light nucleus; and decay of the dinuclear system from the equilibrium configuration into two fragments.

[en] Using multi-nucleon transfer reactions, we are promoting surrogate reactions to obtain nuclear data for wide variety of isotopes including short-lived nuclei. The experiments have been carried out at the JAEA tandem Pelletron accelerator 20UR. (author)

[en] Here, the structure of decoupled positive-parity and semidecoupled negative-parity bands up to high spin in ^197,199Hg has been studied using multinucleon transfer reactions with the Gammasphere array. A positive-parity band in ¹⁹⁹Hg with the (vi_13/2)³ decoupled configuration that deexcites to levels in the negative-parity sequences is newly established. The semidecoupled sequences in both isotopes are extended to higher spin. Rotation-aligned angular momenta and crossing frequencies determined from experiment are in fair agreement with those from cranking calculations. Finally, a transition from oblate collective rotation at low spin to triaxial noncollective shapes at high spin is indicated.

[en] The possibility of the interpretation of fission of heavy nuclei as the process of formation, evolution, and decay of a dinuclear system is discussed. The interpretation is based on the nuclear interaction data obtained in heavy-ion nuclear physics investigations

No abstract available

[en] Nuclear processes that influence the final fission fragment spins and excitation energies are important from a nuclear technology view-point because they determine the partition and energy release through prompt neutrons and gamma rays. From a fundamental view-point too they are very important and they still constitute a widely open problem in collective nuclear dynamics. These processes are caused by motions of nucleons governed by the changing one-body mean field. Keeping this in mind, the present work examine the fragment spin bearing modes that are active during the final phases of the fission process

[en] The production yields of new neutron-rich ^84,86Zn and ^90,92Ge isotopes beyond N=50 and isotopes of nuclei with charge numbers Z=64-80 are estimated for future experiments in the multinucleon transfer reactions at energies close to the Coulomb barrier. (author)

[en] The model based on the picture of the interacting fragments is applied to the description of the experimental data on deep inelastic collisions of heavy ions

[en] The detection of multinucleon transfer channels populated with very low cross-sections allow to study into detail phenomena that are important for a wide class of experiments. Some of the results recently obtained at LNL with the time-of-flight magnetic spectrometer PISOLO are discussed. A comparison between the data and the microscopic calculations performed with the new theoretical model developed by the Copenhagen group are presented

[en] Nuclear K-isomers play an important role in understanding the structure of deformed axially symmetric nuclei. Examples are presented of recent studies in the rare-earth region (A ∼ 180) using deep-inelastic and multi-nucleon transfer reactions, and in the trans-fermium region (A ∼ 250) using fusion-evaporation reactions. A specific two-level mixing scenario is invoked to explain the unusual decay of the K^π = 13⁺ isomer in ¹⁷⁴Lu. The identification of 2- and 4-quasiparticle isomers in ²⁵⁴No is discussed and predictions of similar isomers in neighboring No and Rf nuclei are presented.