[en] These proceedings contain the articles presented at the named workshop. These are a description of the FOBOS 4π detector of charged particles at Dubna and experiment proposals for this detector concerning multifragmentation as critical phenomenon in hot nuclei, phase transformations in hot nuclei, fission of hot nuclei, research possibilities with radioactive nuclear beams at LNR-JINR, the fission of nuclei with Z ≥ 100, induced by secondary-beam particles, studies of the fission of excited nuclei by the FOBOS detector, the fission of superdeformed states in the A=190 region, and the formation of light particles in heavy ion collisions and 4Π experiments. (HSI)

[en] Experimental results of measuring mass distribution of compound nucleus fission fragments, produced in the ²⁰⁸Pb+⁴⁸Ca reaction at 25 MeV excitation energy are presented. The radiochemical technique was used in the experiments. Mass and isotopic distributions of ²⁵⁶102 compound nucleus fission fragments have been obtained. Mass distributions had sharply expressed asymmetry, in this case asymmetrical fission with heavy fragment generation in the mass region Asub(N)=142-145 1.5-1.7 times more preferable than asymmetric distribution Asub(N)=Asub(L) approximately 128. The asymmetric mass distribution obtained testifies to the shell effects conservation in the ²⁵⁶102 nucleus at 25 MeV excitation energy

[en] A double-arm time-of-flight spectrometer for the DEhMAS installation intended to registrate and study the characteristics of fragment-like products produced in heavy-ion reactions with complex nuclei is described. The base of the spectrometer are two identical mobile position sensitive time-of-flight arms. Each arm consists of a transmission detector on the base of microchannel electron multiplier and a plane-parallel avalance counter, which permit to determine the velocity, and of a position sensitive ionization chamber which measures the energy, X and Y coordinates of detected particle. Time-of-flight coordinate measurements permit to identify detected products by mass, energy, space distribution at mass resolution being M=+-1.5 a.e.m. The principle of correlation measurements is also described basing on which one can separate products belonging to a definite reaction channel

[en] Experimental results of studying the fission fragment mass distributions in the ⁴⁰Ar + ²⁴³Am reaction of the bombarding energies of 300, 240, 222 and 214 MeV are presented. The dependences of the total kinetic energy on the fragment mass, and the fragment angular distributions have been measured by the angular correlation method. Calculated fission probabilities are also presented. A conclusion is drawn on a possible asymmetric mode of decay of the heavy system studied

[en] A method for the measurement of the excitation function of the fission of heavy compound nuclei by the measurement of the characteristic x-radiation of the fission fragments is described. Experimental results of interaction barrier determination and of rsub(eff) are given for the reaction Pb+⁵⁸Fe. The data are compared with results of other measurements. (orig./WL)

[en] The results of measurements of dependences for reaction product yields on mass and total kinetic energy (TKE) for ⁶⁴Zn induced reactions on the silver, tin, lantanum targets at the different beam energy over Coloumb barrier are presented. Considerable yields of projectile- and target-like products with TKE-values smaller than Coloumb barrier had been observed in the reactions with Sn-targets in contrast to the results for other targets. Observed shape peculiarities can be connected with initial structures of interacting nuclei, namely, with shell effect Z=50 of target, which provides conservation of individual properties of the target nuclei

[en] The X-ray emission in the 85-to-150 MeV Xe and 115 MeV La bombardments of thick natural La targets has been measured. The spectra and yields of X-ray emission are obtained. Continuous X-ray distribution have been found to lie beyond the target and projective characteristic X-ray energies. The high energy parts of these continua are interpreted as K-radiation of quasimolecules with effective atomic numbers Z=111 and Z=114, respectively

No abstract available

No abstract available

No abstract available