Electron-hydrogen scattering in Faddeev-Merkuriev integral equation approach

Electron-hydrogen scattering is studied in the Faddeev-Merkuriev integral equation approach. The equations are solved by using the Coulomb-Sturmian separable expansion technique. We present $S$- and $P$-wave scattering and reactions cross sections up to the $H(n=4)$ threshold.Comment: 2 eps figure

Three-potential formalism for the atomic three-body problem

Based on a three-potential formalism we propose mathematically well-behaved Faddeev-type integral equations for the atomic three-body problem and descibe their solutions in Coulomb-Sturmian space representation. Although the system contains only long-range Coulomb interactions these equations allow us to reach solution by approximating only some auxiliary short-range type potentials. We outline the method for bound states and demonstrate its power in benchmark calculations. We can report a fast convergence in angular momentum channels.Comment: considerably revised, 9 pages, revtex, 1 ps figur

First contribution to the knowledge of the braconid wasps (Hymenoptera, Braconidae) of Malta

A total of 48 species of braconid wasps (excluding 16 Aphidiidae) are here reported as occurring in the Maltese Islands, of which 38 species are reported for the first time from this territory. The braconid species of Malta belong to 13 subfamilies, of which two are the richest in terms of species diversity: Braconinae with 10 and Microgastrinae with 16 species. One Microgastrinae, Dolichogenidea zerafai sp. n. is described and distinguished from closely related species. The majority of the known species are widely distributed in Europe or in the Palaearctic. The braconid material is deposited in D. Mifsud’s private collection, with a few duplicates in the Hungarian Natural History Museum, Budapest.peer-reviewe

Variational separable expansion scheme for two-body Coulomb-scattering problems

We present a separable expansion approximation method for Coulomb-like potentials which is based on Schwinger variational principle and uses Coulomb-Sturmian functions as basis states. The new scheme provides faster convergence with respect to our formerly used non-variational approach.Comment: some typos correcte

Pre-Cluster Dynamics In Multifragmentation

The initial production and dynamical expansion of hot spherical nuclei are examined as the first stage both in the projectile-multifragmentation and in central collision processes. The initial temperatures, which are necessary for entering the adiabatic spinodal region, as well as the minimum temperatures and densities, which are reached in the expansion, significantly differ for hard and soft equations of state. Additional initial compression, occurring in central collisions leads most likely to a qualitatively different multifragmentation mechanism. Recent experimental data are discussed in relation to the results of the proposed model.Comment: 6 pages LaTeX with 3 EPSF figures; Proceedings of the 1st Catania Relativistic Ion Studies: Critical Phenomena and Collective Observables, Acicastello, May 27-31, 1996, to be published by World Scientific Publ. C