[en] The 'counting of maxima' method of Brink and Stephen, conventionally used for the extraction of the correlation width of statistical (compound nucleus) reactions, is generalized to include precompound processes as well. It is found that this method supplies an important independent check of the results obtained from auto-correlation studies. An application is made to the reaction ²⁵Mg(³He,p). (Author)

[en] Continuum spectra of particles emitted in incomplete fusion reactions are one of the major interests in current nuclear reaction studies. Based on an idea of the so-called breakup fusion (BF) reaction, several authors derived closed formulas for the singles cross section of the particles that are emitted. There have been presented, however, two conflicting cross section formulas for the same BF reaction. For convenience, we shall call one of them the IAV (Ichimura, Austern and Vincent) and the other UT (Udagawa and Tamura) cross section formulas. In this work, the formulation of the UT cross section formula (prior-form) is presented, and the post-form version of the IAV cross section formula is evaluted for a few α- and d-induced reactions based on the exact finite range method. It is shown that the values thus calculated are larger by an order of magnitude as compared with the experimental cross sections for the α-induced reactions, while they are comparable with the experimental cross sections for the d-induced reactions. A possible origin of why such a large cross section is resulted in the case of α-induced reactions is also discussed. Polarization of the residual compound nucleus produced in breakup fusion reactions are calculated and compared with experiments. It is shown that the polarization is rather sensitive to the deflection angles of the strongly absortive partial waves and to obtain a good fit with the experimental data a l-dependent potential in the incident channel is needed in order to stress the lower partial waves

No abstract available

[en] A tentative schematic classification of nuclear processes occurring in heavy ion fusion, based mainly on different interaction times, is given. The distinction between processes, the main parameters of classification and systems is attempted. (author)

No abstract available

[en] The heavy-ion fusion process is investigated by using a new recently proposed approach. The energy dependence of the fusion cross-section and its maximum value are well reproduced for a wide range of systems and energies

[en] A theory which describes in a consistent and uniform manner the development of the deeply inelastic collision through all its stages is presented. It is shown how the two collision partners, which were initially in their ground states, become excited in the approach phase mainly through coherent processes. Gradually, denser regions of the internal excitation spectrum are populated, and a statistical description in terms of stochastic rate equations naturally emerges. The interaction between the collective degrees of freedom and the internal system is treated in a self-consistent way: The heating up of the internal system is due to the energy dissipated from the collective motion, while the force acting on the collective coordinates is derived from the internal density matrix. The internal system is discussed in the adiabatic representation. Therefore, effects which are due to the development of large deformations can be accounted for in a reliable manner. The ability to describe coherent processes is shown to be intimately connected with the time resolution implicit in this quantum-statistical approach. The present formalism introduces a finer time scale to the description of DIC than has hitherto been applied, and its consequences are investigated. (H.K.)

[en] Theoretical progress made toward signatures of compression effects, shock-wave, pion condensate or density isomer are reviewed and compared to recent experimental results

[en] The relaxation of the mass asymmetry in deeply inelastic heavy ion collisions is investigated within the framework of a Fokker-Planck equation. We determine deflection functions and angular momentum dependent interaction times from experimental data. Using mass transport coefficients obtained previously in a microscopic theory, element distributions are calculated and compared with recent measurements. (author)

[en] Short communication. 3 refs., 2 figs