[en] A contribution from a second step (³He, ³H) reaction is introduced to explain the anomalous shape of ⁶Li break-up triton energy spectrum. The experimental verification of such assumption is suggested

[en] Complete fusion cross-section is calculated in the frame of a l-window model for several reactions in different ranges of nuclear masses. A quite good overall agreement is found. The sensitivity of the fusion cross-section to the existence of a lower-l cut-off is also discussed

[en] A simple interpretation of the existence of a l-window in complete fusion reactions between heavy ions is suggested. The dependence of the calculated impact parameters leading to fusion vs. Vsub(rel)/C exhibits strong analogies with the findings in the collision of two water droplets

[en] The polarization of neutrons from the ³H(d, n)⁴He at Esub(d)=7 MeV and 0sup(deg), 10sup(deg), 20sup(deg), 30sup(deg), 40sup(deg), 50sup(deg), emission angles have been measured by means of a liquid Helium polarimeter. The results indicate that waves other than S' contribute to the above reaction

No abstract available

[en] We suggest a simple interpretation of the existence of a low-l cutoff in the angular momenta leading to complete fusion. An l-window model for the description of the fusion process is proposed. No adjustable parameters are used in the calculation of the cross section. Comparison with available TDHF calculations and with experimental data are shown. (orig.)

[en] The combined use of muon production height along the shower axis evaluated from muon direction and from muon arrival time selects high energy muons neither significantly scattered in the atmosphere nor deviated in the geomagnetic field. This allows the reconstruction of Extensive Air Shower (EAS) longitudinal development in the knee energy region, which provides informations about the nature of primary particle and its interaction with the air nuclei. We describe the possibility to reconstruct the muon height of production by the combination of tracking and timing measurements as provided by a large area tracking and timing telescope now available in the EAS-TOP experiment. 40 m² of bakelite RPCs have been installed under the existing muon-hadron detector in order to obtain accurate measurement of muon arrival time with respect to the arrival of the shower core

[en] Experimental fusion cross sections are investigated as a function of the relative velocity of colliding nuclei. These excitation functions exhibit a common maximum for upsilon/c around 0.065. The onset of incomplete fusion seems to occur for velocities just slightly higher than this value. (orig.)

[en] The isotopic yields both from deep inelastic collisions between heavy ions and from fragmentation processes have been successfully described by Q-value systematics. In order to test their range of validity and to investigate correlations with specific reaction mechanisms, the Q-value systematics have been applied to the multinucleon-removal spectra following pion and kaon absorption on complex nuclei. Indeed, the isotopic distribution derived from these spectra shows the following feature: Most of the yields are not strongly influenced by the charge of the pion and can be explained by nuclear evaporation following pion absorption. In contrast, the yields of elements far removed from the target show a better agreement with a Q_gg law under the assumption that the pion is implanted in the target. The influence of the pion charge upon the yield distribution is thus evidenced even after the removal of 10--14 nucleons from the target. As a dominant evaporation process would not reproduce this effect, this indicates the importance of direct reaction mechanisms associated with pion absorption. This could support the hypothesis of an absorption on a complex cluster or a very strong final-state interaction. The parameter T extracted from the Q-value systematics appears proportional to the total energy brought by the meson into the system

No abstract available