[en] For the present analysis, we simulated the reactions of "2"0Ne+"2"0Ne, "9"3Nb+"9"3Nb and "1"9"7Au+"1"9"7Au at incident energies of 150 MeV/nucleon and 400 MeV/nucleon over whole range of impact parameter (b¯ = 0.0-0.8)

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[en] A differentially pumped windowless ²⁰Ne gas target and a ²⁰Ne beam produced with the ATLAS accelerator at Argonne National Laboratory were used to measure angle-averaged excitation functions for binary decay of ²⁰Ne+²⁰Ne into low-lying states of ²⁰Ne+²⁰Ne and ²⁴Mg+¹⁶O, in the region of excitation energy in ⁴⁰Ca from 51.4 to 58.2 MeV (²⁰Ne beam energies from 61.8 to 75.4 MeV). The ²⁰Ne+²⁰Ne mass partition displays little correlated structure and there exists no evidence of intermediate width resonances in these channels with branching ratios comparable to those seen in the ²⁴Mg+²⁴Mg system. Angular distributions for the elastic channel are consistent with those obtained using optical-model calculations. The exictation functions for the low-lying channels in ²⁴Mg+¹⁶O do contain some structures, with widths varying from 400 to 800 keV in the c.m. system

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[en] It has been suggested that the fusion structure is a result of surface transparency arising from the small number of open reaction channels and the application of this idea leads to the conclusion that the effect should not be present in the ²⁰Ne + ²⁰Ne system. However, a recent detailed analysis of the evaporation residues in this reaction (performed by one of us (NP) on the Oxford tandem using γ-ray techniques), shows that the structure is quite clearly observable even in this case. (orig./HSI)

[en] Within the framework of the isospin-dependent Boltzmann-Langevin equation, the production cross sections of fragments are calculated for reactions of Ne collisions with C, Al, Cu, Sn, Ta, and Pb targets at 600 MeV/nucleon. It is found that the production cross sections for fragments Z=2 to 9 are qualitatively reproduced by the present calculations except for C target. The enhancement of even-Z fragments (C, O) cross sections shown in the experimental data is not well reproduced except for Ta target, however the observed suppression of the F fragment cross sections is described very well. The suppression of F production is discussed in terms of isotopic distribution of fragments. This is the first time to use the isospin-dependent Boltzmann-Langevin equation model to calculate the fragmentation cross sections for these reaction systems

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[en] A preliminary ²⁰Ne(α,α'c) coincidence experiment indicates a strong coupling of the isoscalar giant resonance in ²⁰Ne to the α₀ decay channel. The data analysis is severely effected by strong (α,2α) knock-out contributions. (orig.)