Critical stability

Session

T2

17 Oct 2008, 09:00

Ettore Majorama Centre for Scientific Culture

24. Spin solvent effects in doped helium clusters: A microscopic manifestation of superfluidity

Prof. PABLO VILLARREAL (INSTITUTO DE FISICA FUNDAMENTAL (CSIC))

17/10/2008, 09:00

Talks at Critical Stability V (Erice, October 2008)

Normal

Doing a parallelism of nuclei/electrons with dopant/helium atoms, a quantum chemistry approach is used to perform spectral simulations of molecular species embedded in helium clusters of variable size. To account for the spin characteristics of the solvent, Hartree or Hartree-Fock methodology is applied to obtain energies and structural properties of the aggregates. In this frame, one...

46. On the determination of the parameters of quantum resonances: theory and experiment

Dmitri Fedorov (Aarhus University)

17/10/2008, 09:35

Talks at Critical Stability V (Erice, October 2008)

Normal

Determination of the energy and the width of a resonance from experimental data is not an unambiguous procedure, in particular for broader resonances. Likewise, it is not unusual that different theoretical approaches to calculation of resonances result in somewhat different resonance parameters. In an attempt to clarify the situation we perform an investigation, using a simple model quantum...

39. Highly excited bound states and near-threshold resonances in ozone isotope effect

Prof. Sergy Yu. Grebenshchikov (Max-Planck-Institut für Dynamik und Selbstorganisation, Göttingen)

17/10/2008, 10:10

Talks at Critical Stability V (Erice, October 2008)

Normal

The three-body recombination reaction, O_2 + O + M --> O_3 + M (1) is one of the central reactions of the Chapman cycle controlling the stability of the stratospheric ozone (O_3) layer. This reaction, in which O_3 is initially formed at dissociation threshold, is also responsible for large enrichments of heavy isotopomers of...

30. Virtual states, halos and resonances in three-body atomic and nuclear systems

Prof. Tobias Frederico (ITA, São José dos Campos, Brazil)

17/10/2008, 11:00

Talks at Critical Stability V (Erice, October 2008)

Normal

A bi-dimensional map in the parameter space can be defined in the Efimov limit by the critical conditions for an excited state in three-body systems with two-identical particles. The scattering lengths of the two-body subsystems and one three-body scale define the parametric space. The border of the map encloses a region where excited states do exist (see ref. [1]). In this parameter...

40. Multiparticle interactions of zero-range potentials

Joseph Macek (University of Tennessee and Oak Ridge National Laboratory)

17/10/2008, 11:35

Talks at Critical Stability V (Erice, October 2008)

Normal

For two particles it is often convenient to replace local or non-local potentials by zero-range interactions. Since they are zero-range, these interactions can often be replaced by boundary conditions at a point where the separation between two particles vanishes. In either case, zero-range potentials are useful when the details of the interaction at small distances are not critical for...