[en] Breakup couplings are known to have important effects on the near-barrier elastic scattering of "6He. However, the ("6He, "5He) single neutron stripping has also been found to have a significant coupling effect, although in calculations that did not include breakup. We firstly present calculations for the "6He + "2"0"8Pb system that include both breakup and single neutron stripping at 22 and 27 MeV to confirm that the significant stripping coupling effect persists in the presence of breakup couplings. We then compare separate calculations including transfer couplings only with recent elastic scattering data at incident "6He energies of 14, 16, 18, 22 and 27 MeV. We also include in an approximate way the two-neutron stripping reaction in an attempt to gain some qualitative insight into the possible coupling effects of this other important near-barrier reaction channel. (author)

[en] The dissociation of 63 MeV/nucleon beams of ⁶He has been measured by observing the breakup α particles at four angles between 0 degrees and 5 degrees in the S320 magnetic spectrometer at MSU. Targets with a range in A from 12 to 197 were used. For each breakup event the presence or absence of one or more γ rays from the target was recorded by an array of BaF₂ detectors which surrounded the target. The events in coincidence with γ rays are necessarily nuclear in origin, and a substantial fraction of the observed α particles do have Mγ>0. The data permit a quantitative study of the contribution of different breakup mechanisms by assuming that the A-dependence of breakup in the nuclear field of the target is independent of target excitation. The measurements permit determination of both the longitudinal and transverse momenta of the α particles. These are quite different depending on whether or not target γ rays are observed. Fits to the momentum spectra, which are qualitatively different for light and heavy targets, will be presented

[en] Weakly bound projectiles can break up in the Coulomb field of a target nucleus. This break-up may be a sequential process in which the projectile is first excited to an inelastic state through which it subsequently breaks up, or the projectile can break up rapidly without passing through an intermediate state. It is found that the angular scattering range over which the Coulomb field is dominant is different for these two types of break-up. An explanation of this difference is that the transition matrix element for direct break-up in the Coulomb field has large contributions from widely separated fragments in the initial projectile. (author)

[en] We study the feasibility of an experimental observation of toroidal breakup configurations in Au+Au collisions using the CHIMERA multidetector system. BUU simulations indicate that the threshold energy for toroidal configuration is around 23 MeV/nucleon. The simulations of decay process using the ETNA code indicate the sensitivity of some observables to different studied break-up geometries. (author)

[en] In the past two decades, several laboratories have produced a large amount of data for cross sections, analyzing powers, and other spin observables from various reactions in the three-nucleon system. The results allow one to arrive at a moderately good description of the data by only using the two-nucleon potentials in Faddeev-type calculations. The remaining discrepancies should, in principle, and aside from Coulomb and relativistic effects, be removed once the effects of three-nucleon forces are implemented. High precision data on elastic and break-up reactions show, however, that even after the inclusion of these effects, the picture is not complete yet and some ingredients are still missing in the calculations.

[en] A small scattering chamber is designed and constructed for α-D break-up experiments with provisions of filling up with gas as target and two rotating arms for mounting two surface barrier detectors. Gas geometry factor and angular resolution are calculated. (author)

No abstract available

No abstract available

[en] Short communication

[en] An alternative method to ensure fast convergence of the radial integrals appearing in the deuteron stripping and break-up reactions to the continuum has been suggested. The radial integral is broken up into two parts. In the first part, integration is performed from zero to R by using the exact scattering wave functions. In the second part, wave functions occuring in the integrand are expressed in terms of coulomb functions, and the resulting integral is expressed in terms of a fast converging hyper-geometric functions. The expressions are worked out. (author)