No abstract available

[en] There has recently been a renewed interest in the study of fusion reaction dynamics with loosely bound projectiles at near barrier energies. One interesting aspect of this type of study is the controversy over enhancement/suppression of fusion induced by loosely bound stable projectiles like ^6,7Li

[en] Radiochemistry can be an important tool in studies of nuclear reactions induced by radioactive ion beams (RIBs). RIB intensities are typically 103-105 particles/s leading to very low reaction rates. The sensitivity of radiochemical methods and the ability to uniquely determine the atomic properties of the reaction products offer substantial advantages. The application of radiochemical techniques to study the fusion of ^9,11Li with ⁷⁰Zn and the 'inverse fission' of uranium is described. (author)

[en] Short communication

[en] We discuss the analysis of ¹¹Li and ¹¹C scattering by Mermaz [Phys. Rev. C 47, 2213 (1993)]. We argue that his results show the ¹¹C scattering to be more refractive than that of ¹¹Li, and indicate various effects that could be responsible

[en] The nuclei near the neutron drip line, typically ¹¹Li nucleus, are characterized by the neutron-halo structure. A microscopic theory to evaluate the total reaction, interaction and two-neutron removal cross sections of ¹¹Li is presented in the framework of the Glauber theory. We calculated the nuclear parts of the cross sections with neutron-halo inputs. We obtained a good agreement with experiment at 800 MeV/nucleon for light targets. It is emphasized that the optical limit approximation is not good for calculating the reaction cross section of a nucleus with halo structure. (author)

[en] Short communication. 2 refs

[en] The neutron halo nuclei characterized by very large matter radii, small separation energy and small internal momentum of the valence neutrons, were discovered by Tanihata and co-workers. Until now, the halo nuclei were investigated mostly by elastic, inelastic scattering and breakup processes. It was recently predicted, that due to the very large dimension of ¹¹ Li, one may expect, that in a fusion experiment on a light target, the valence neutrons will not be absorbed together with the ⁹ Li core, but will be emitted in the early stage of the reaction process. The first experiment aiming to check this expectation, was performed at the RIKEN-RIPS facility. In the experimental setup, the MUSIC chamber, achieved in the frame of IFIN-HH - RIKEN cooperation, played an important role. The obtained results confirm the prediction, indicating to a novel pre-emission effect (near 40 %, for one or two neutrons). The pre-emission of neutron pairs was investigated by time-position coincidences. It is considered that the pre-emission of neutron pairs is responsible for the experimentally observed strong neutron focusing effect. An experiment aiming to a large number of n-n coincidences, based on a new neutron array detector built in the frame of IFIN-HH - RIKEN cooperation, is in preparation. A model for the pre-emission probabilities calculations has been also worked out. Good agreement with the experimental data has been obtained. (author)

[en] A kinematically complete measurement of the Coulomb dissociation of ¹¹Li into ⁹Li + 2n by a Pb target was made for ¹¹Li excitation energies up to ∼1.5 MeV. The ⁹Li velocity is greater than the average neutron velocity, indicating Coulomb acceleration of the ⁹Li by the Pb nucleus and, therefore, a prompt decay rather than a soft dipole resonance for the breakup process. The n-n momentum and angle correlations show no evidence for a dineutron in the ground state of ¹¹Li. A brief discussion of two neutron walls under construction and of the problems of neutron spectroscopy with large detectors are given. (authors). 16 refs., 8 figs

[en] The Coulomb dissociation cross section for ¹¹Li on ¹⁹⁷Au is calculated for different models of the distribution of dipole response strength in ¹¹Li. All the available models fail in accounting for the low energy behavior of the cross section