[en] A study is made of polarized deuteron elastic scattering from ⁵⁸Ni and ⁴⁰Ca at the intermediate energies of 400 and 700 MeV. A three-body formalism, based on the Single Folding Model, is used for two sets of Dirac nucleon optical potential parameters. Both potentials are designed to fit proton elastic scattering observations at half the incident deuteron energy. The two potentials give different predictions for observed deuteron scattering when used in the schroedinger equation with relativistic kinematics. Good qualitative agreement with experimental observations is obtained in both cases. Quantitative discrepancies between theory and data suggest mechanisms missing from the simple three-body model. To this end, two sources of spin-dependent effects, Pauli-blocking and breakup of the deuteron into spin-singlet intermediate states, are studied. (author)

[en] We present an analysis of the Beam-Target double polarization asymmetry for the photoproduction of Θ⁺ in γn→Θ⁺K^-. We show that this quantity can serve as a filter for the determination of the Θ⁺'s spin-parity assignment near threshold. It is highly selective between 1/2⁺ and 1/2^- configurations due to dynamical reasons

[en] The adiabatic approximation in the theory of reactions involving halo nuclei is reviewed. This approximation gives new insights into the role of the halo as well as suggesting practical ways of including the effects of strong coupling to continuum states of the halo system. The application of these techniques to total reaction cross section and elastic scattering calculations is reviewed and new results for transfer reactions are compared with recent GANIL data. Corrections to the adiabatic approximation are briefly discussed

[en] Elastic scattering of polarised ⁶Li from ⁴⁰Ca at E_lab=2.1 GeV is investigated within an α+d cluster model for the projectile. Schroedinger-equivalent Dirac phenomenological optical potentials for p-⁴⁰Ca at 350 MeV are used consistently within a single folding model to obtain the ⁶Li-⁴⁰Ca interaction. The elastic scattering tensor analysing power, A_yy, is found to be due predominantly to the second order contribution from the static folded spin-orbit potential and, to a slightly lesser extent, to the ⁶Li D-state. (orig.)

[en] A non-local parameterization of the proton-nucleus optical potential is presented. This new parameterization is based on the premise that the effective mass has a simple linear density dependence, and that the kinetic energy term in the Schroedinger equation for nucleons contains a spin dependence which, while it can be ignored for the free case, becomes important when interactions are present. A connection is made with the Dirac equation, and applications to deuteron scattering and proton coupled-channel elastic scattering are discussed. (orig.)

[en] The effect of coupling to the projectile breakup channel on ¹¹Li elastic scattering from ¹²C at 57.9 MeV/nucleon and ²⁸Si at 29 MeV/nucleon is investigated. Correlated ¹¹Li wave functions based on Faddeev three-body models are used within a four-body (⁹Li+n+n+A) Glauber scattering model. The single-folded potential for ¹¹Li is calculated and used to isolate the part of the scattering amplitude from coupling to breakup states. It is found that the breakup has a large effect on the elastic cross sections and that higher-order breakup terms, such as that responsible for continuum-continuum coupling, are important. The dynamic polarisation potential representation of the breakup effect is calculated and found to be strongly absorptive and with a significant repulsive real part in the far surface region, which is qualitatively similar to that found in ¹²C scattering. ((orig.))

[en] Intermediate energy deuteron elastic scattering is investigated in a three-body model incorporating relativistic kinematics. The effects of deuteron breakup to singlet spin intermediate states, on the elastic scattering observables for the ⁵⁸Ni(d vector, d)⁵⁸Ni reaction at 400 and 700 MeV, are studied quantitatively. The singlet-breakup contributions to the elastic amplitude are estimated within an approximate two-step calculation. The calculation makes an adiabatic approximation in the intermediate states propagator which allows the use of closure over the np intermediate states continuum. The singlet channel coupling is found to produce large effects on the calculated reaction tensor analysing power A_yy, characteristic of a dynamically induced second-rank tensor interaction. By inspection of the calculated breakup amplitudes we show this induced interaction to be of the T_L tensor type. (orig.)

[en] The past decade has seen an explosion of theoretical interest in the structure and dynamics of halo nuclei. Their basic defining features of weak binding and large radial extent due to the extended tail in their densities is now well-described within few-body models. This has led to impressive advances in few-body reaction theories which crucially take into account this few-body nature. This paper will review some of the recent advances in both structure and reaction studies, and will focus on the issues currently of interest along with possible directions for future advances. On the structure side, improvements to few-body models are being explored to take into account the role of antisymmetrization more accurately and the importance of core polarization and excitation. The successes of fully microscopic approaches will also be reviewed. (orig.)

[en] Halo nuclei are characterised by their weak binding, large spatial extent and hence a quite pronounced, yet highly correlated, few-body structure. This is typically in terms of a well-defined core plus one or more valence nucleons. Over the past decade the properties of halo nuclei have been studied theoretically using a range of reaction models, many of which having served us well for half a century or more in the study of less exotic, ''mean-field'', nuclei. However, it is now clear that for many reactions with halo nuclei, it is not appropriate to disentangle (factorise out) the structure information from the reaction information. That is, the few-body nature of these systems requires few-body reaction models in which the nuclear structure and reaction mechanisms are necessarily entangled. This talk briefly reviews the physical assumptions made by various reaction models, and points to areas where progress is being made to extend their range of applicability in order to provide further insights into halo structure. (orig.)

[en] Published in summary form only