A medium to long term roadmap for access services on DTV

DTV4All is a project partly funded by the European Commission (CIP ICT Policy Support Programme) to facilitate the provision of access services on digital television across the European Union. Access services literally help their users access the content of television programmes. Important examples of access services for people who are hard of hearing or deaf are subtitles and deaf signing provided with television programmes to allow their users to more fully appreciate the programme dialogue. The primary aim of the DTV4All project is to encourage the roll out of access services on digital television across the EC. To do this the project targets eroding the barriers to the roll out of access services by making clear what these barriers are and how they may be overcome. This paper provides an overview of the progress the project has made in its first two years in meeting this target

9Be scattering with microscopic wave functions and the CDCC method

We use microscopic 9Be wave functions defined in a alpha+alpha+n multicluster model to compute 9Be+target scattering cross sections. The parameter sets describing 9Be are generated in the spirit of the Stochastic Variational Method (SVM), and the optimal solution is obtained by superposing Slater determinants and by diagonalizing the Hamiltonian. The 9Be three-body continuum is approximated by square-integral wave functions. The 9Be microscopic wave functions are then used in a Continuum Discretized Coupled Channel (CDCC) calculation of 9Be+208Pb and of 9Be+27Al elastic scattering. Without any parameter fitting, we obtain a fair agreement with experiment. For a heavy target, the influence of 9Be breakup is important, while it is weaker for light targets. This result confirms previous non-microscopic CDCC calculations. One of the main advantages of the microscopic CDCC is that it is based on nucleon-target interactions only; there is no adjustable parameter. The present work represents a first step towards more ambitious calculations involving heavier Be isotopes.Comment: Phys. Rev. C in pres

General transformation of alpha cluster model wave function to jj-coupling shell model in various 4N nuclei

The antisymmetrized quasi-cluster model (AQCM) is a method to describe a transition from the alpha-cluster wave function to the jj-coupling shell model wave function. In this model, the cluster-shell transition is characterized by only two parameters; R representing the distance between alpha clusters and Lambda describing the breaking of alpha clusters, and the contribution of the spin-orbit interaction, very important in the jj-coupling shell model, can be taken into account starting with the alpha cluster model wave function. In this article we show the generality of AQCM by extending the application to heavier region; various 4N nuclei from 4He to 52Fe. We show and compare the energy curves for the alpha+40Ca cluster configuration calculated with and without alpha breaking effect in 44Ti