Prof.
André Martin
(CERN, Geneva, Switzerland)
13/10/2008 09:00
Normal
This welcome address will briefly present the Ettora Ma jorana Centre for Scientific Culture
of Erice, and stress the importance of quantum few-body systems at the edge of stability.
Prof.
Eduardo Garrido
(Instituto de Estructura de la Materia, CSIC, Madrid, Spain)
13/10/2008 09:20
Stellar nucleosynthesis reactions are responsible for the abundances of the different
elements in the Universe. These reactions happen at very low relative energies between the
nuclei involved, and the calculation of the corresponding production rates is one
of major issues in Nuclear Astrophysics. These reactions can be of different nature (radiative
capture, rearrangement processes...)...
Prof.
Avraham Gal
(Racah Institute of Physics, Hebrew University, Jerusalem)
13/10/2008 09:55
It takes two nucleons to bind a Lambda hyperon, and perhaps as many as three nucleons to bind two Lambda hyperons. In my talk I will review few-body calculations which are relevant for deciphering the onset of binding in Lambda hypernuclei and in Lambda-Lambda hypernuclei.
I will also discuss the onset of binding for Xi hyperons, stabilizing them against the free-space
conversion Xi + N...
Dr
Christian Forssén
(Chalmers University of Technology)
13/10/2008 10:45
The ab initio no-core shell model (NCSM) is a well-established theoretical framework aimed at an exact description of nuclear structure starting from high precision interactions between the nucleons [1,2].
The principal foundation of the method is the use of effective interactions appropriate for the large, but finite, harmonic-oscillator model spaces employed in the calculations. These...
Prof.
Oleg O. I. Kartavtsev
(Dubna, Russia)
13/10/2008 11:20
During the recent years, there is a continuous interest to the experimental and theoretical
study of the 12 C nucleus [1, 2, 3, 4]. In this respect, of special importance is the description
of the Hoyle state, which was predicted more then 50 years ago merely from the abundance
of elements in the universe. Whereas the Hoyle state is fairly well studied experimentally,
e. g., its...
Prof.
Martial Ducloy
(Université Paris 13)
13/10/2008 15:00
he long range interaction between atoms and material surfaces or nanobodies is a case study of a pure quantum system interacting with macroscopic or mesoscopic systems. This field is of increasing importance owing to the fast development of nanoscience and nanotechnologies. The confinement of atoms inside a nano-size space strongly alters the internal properties of the atomic system and its...
Prof.
Charlotte Elster
(Ohio University)
13/10/2008 15:35
Traditionally three-nucleon calculations are carried out by solving Faddeev
equations in a partial wave truncated basis, working either in momentum
or in coordinate space. In Ref.~\cite{1} the Faddeev equations were solved
directly as function of vector
variables for scattering at intermediate energies. The key advantage of
this formulation lies
in its applicability at higher energies,...
Dr
Arnoldas Deltuva
(Centro de F ́ısica Nuclear, University of Lisbon, Portugal)
13/10/2008 16:10
There is a long history of theoretical prescriptions for the solution of the Coulomb problem
in three-nucleon continuum. Most of them employ configuration-space framework [1, 2, 3]. In
contrast, we solve momentum-space integral equations. The method we use for the inclusion
of the Coulomb interaction is based on the ideas proposed in Ref. [4] for two charged particle
scattering and...
Dr
Pavel Kurasov
(Lund University)
13/10/2008 17:00
It is well-known that the celebrated Fermi delta potential model
[1,2] leads to
non-trivial scattering in the s-channel only. We propose
a new family of point interaction models which may be
used to describe particles with non-trivial interaction also
in the $p$-channel while preserving exact
solvability and point character of the interaction [3]. These
models are given by self-adjoint...
Dr
Georg Bruun Bruun
(Niels Bohr Institute, Copenhagen, Denmark)
13/10/2008 17:35
Normal
A low energy effective theory based on a microscopic multi-channel description of the atom-atom
interaction is derived for the scattering of alkali atoms in different hyperfine states [1]. This
theory describes all scattering properties, including medium effects, in terms of the singlet and
triplet scattering lengths and the range of the atom-atom potential and provides a link between a...
Dr
Michele Viviani
(INFN, Sezione di Pisa)
14/10/2008 09:00
The study of the four nucleon (4N) system is interesting from a number of
different perspectives. First of all, many reactions involving four nucleons,
are of extreme astrophysical interest, as they play important roles in solar
models or in big-bang nucleosynthesis. Moreover, 4N systems have become increasingly important as testing grounds for models of the nuclear force, being the A=4...
Prof.
alejandro kievsky
(INFN)
14/10/2008 09:35
Dr
Miguel Marqués
(LPC, Caen, France)
14/10/2008 10:10
The development of light, neutron-rich beams has opened in the last decade new perspectives
for the study of many-neutron systems. Breakup experiments at GANIL will be described, using
beams of 6−8 He, 11 Li, 14 Be and 15 B at several tens of MeV/N. Our approach is based on the
detection in coincidence of the breakup fragment and the neutrons in order to investigate the
different...
M.
M.V. Volkov
(Department of Physics, AlbaNova University Center,Stockholm University, 106 91 Stockholm, Sweden)
14/10/2008 11:00
Few-body systems with the Coulomb interaction are of great interest in atomic and molecular physics. However, solving the Coulomb scattering problem is very difficult from both theoretical and computational points of view because of the long-range nature of the Coulomb potential.
The asymptotic boundary conditions at infinity, which are rather complicated for the few-body scattering problem,...
Prof.
Nils Elander
(Stockholm University)
14/10/2008 11:35
Quantum scattering calculations on two and three-body systems with
Coulomb interaction using the driven Schroedinger equation combined with
the exterior complex scaling are discussed. Results for two-body scattering
are reported, and the generalization to three-body scattering is considered.
Prof.
Stephanie Reimann
(Lund University)
14/10/2008 15:00
Many analogies exist between nanostructured quantum systems such as quantum dots, and trapped ultra-cold atom gases. The newly emerging "atomtronics" makes phenomena such as Bose-Einstein condensation accessible for the micro- and nano-design of future quantum devices.
In this talk, we shall discuss how effects similar to Coulomb blockade in quantum dots may occur in systems of ultracold,...
Prof.
Anna Okopinska
(University of Humanities and Sciences)
14/10/2008 15:35
A one-dimensional system of two trapped bosons which interact through a contact potential is studied using the optimized configuration interaction method. The rapid convergence of the method is demonstrated for a series of trapping potentials of convex and non-convex shapes. The energy spectra, as well as natural orbitals and their occupation numbers are determined in function of the...
Dr
Raquel Alvarez-Rodriguez
(INFN Pisa)
14/10/2008 16:10
We discuss the three-body decay mechanisms of many-body resonances. Sequential decays proceed via two-body configurations after emission of the third particle. In direct decay all three particles leave simultaneously their interaction regions. The intermediate paths within the interaction regions are not observables and only accessible through models. The momentum distributions carry, apart...
Dr
Tomas Gonzalez-Lezana
(Instituto de Fisica Fundamental, CSIC)
14/10/2008 17:00
We have recently developed an approximate method to study the rovibrational
spectra of molecular trimers, based in the use of distributed Gaussian
functions (DGFs) to describe the interparticle distances [1,2]. The main
assumption is to consider that rotation and vibration can be treated separately.
The purely vibrational problem for a zero total angular momentum, J=0, is
solved by...
Prof.
Elena Kolganova
(Dubna, Russia)
14/10/2008 17:35
Normal
Method of scattering calculations on three-body systems using differential Faddeev equations
is discussed. An algorithm for calculating three-body resonances is considered and applied to
the study of Helium trimer.
M.
Pierre Duclos
(Centre de Physique Théorique, Marseille)
15/10/2008 09:00
Prof.
Raymond Brummelhuis
(Birbeck, U. London, UK)
15/10/2008 09:35
We study the bound states of relativistic hydrogen-like atoms cou-
pled to strong homogeneous magnetic fields, under the assumption of
an infinitely heavy nucleus. Working in the adiabatic approximation
in which the electron is confined to the lowest Landau level, we show
that the discrete spectrum is always non-empty and that, as the field
strength increases, its eigenvalues...
Prof.
Alain Joye
(Institut Fourier, Universite de Grenoble)
15/10/2008 10:10
We propose an alternative to the usual time--independent Born--Oppenheimer
approximation that is specifically designed to describe molecules with
Hydrogen bonds. In our approach, the masses of the Hydrogen nuclei are scaled
differently from those of the heavier nuclei, and we employ
a specialized form for the electron energy level surface.
Consequently, anharmonic effects play a role in...
Prof.
Edward A. G. Armour
(School of Mathematical Sciences, University of Nottingham, Nottingham NG7 2RD, UK)
15/10/2008 11:00
The field generated by a fixed proton and antiproton a distance R apart is a particular example of a dipole field. The existence or otherwise of bound states of an electron (or a positron) in such a field was originally studied by Fermi and Teller and Wightman [1-3] in the late forties. They showed that if R > 0.639 a_0, a bound state of the system existed but if R < 0.639 a_0, no bound states...
Prof.
Eberhard Widmann
(Stefan Meyer Institute for Subatomic Physics, Vienna, Austria)
15/10/2008 11:35
Experiments with low-energy antiprotons are currently performed at the antiproton Decelerator (AD) of CERN. The main focus of the three experimental collaboration is the study of fundamental symmetries, especially CPT invariance, using antiprotonic atoms and antihydrogen. The ASACUSA collaboration focusses on precision spectroscopy of antiprotonic helium, an exotic three-body system consisting...
Prof.
Vladimir B. Belyaev
(JINR, Dubna, Russia)
16/10/2008 09:00
Solving Faddeev differential equations, binding energies of three-body systems of the type
φN N are calculated. Due to the strong attraction between φ-meson and nucleon, suggested
in [1] and [2], bound states appear in systems φ + np (singlet and triplet), φ + nn and φ + pp.
This indicates on the principal possibility of the formation of new nuclear clusters with increased
number of...
Prof.
Slawomir Wycech
(Soltan Institute for Nuclear Studies)
16/10/2008 09:35
Deeply bound KNN, KNNN and KNNNN states are discussed. The effective force exerted by the
K meson on the nucleons is calculated with static nucleons. Next the binding energies are obtained
by solving the Schrödinger equation or by variational calculations. The dominant attraction comes from the S-wave \Lambda(1405) and an additional contribution is due to \Sigma(1385). The latter state is...
Prof.
Kam Seth
(Northwestern, Chicago, USA)
16/10/2008 10:10
The fascination with the exotic transcends all disciplines. Hadronic, or strong interaction
physics has not been immune from it. Time and again it has come up with ideas of exotic
hadrons. Time and again they turn out to be mirages. But then, once in a while, the exotic
materializes, and all the past failures pale into the excitement of those discoveries. I will present
a tour through...
Prof.
Dario Bressanini
(Universita' dell'Insubria, Como, Italy)
16/10/2008 11:00
Highly compact wave functions with a clear physical meaning for the He atom and He-like isoelectronic ions for Z=1-10 are written as a symmetrized product of exp[(ar+br2)/(1+r)] electron-nucleus terms and an electron-electron Jastrow factor to satisfy the correct asymptotic behavior both at short and large interparticle distances. Some parameters are chosen to satisfy exactly the...
Dr
Thomas Neff
(GSI Darmstadt)
16/10/2008 11:35
The Fermionic Molecular Dynamics (FMD) [1] is a microscopic
model for the description of nuclei in the p- and
sd-shell. Many-body basis states are Slater determinants of Gaussian
wave packets localized in phase space. The wave packet basis is very
flexible and includes the harmonic oscillator shell model basis as
well as Brink-type cluster states as limiting cases. The width of the
wave...
Dr
Javier Vijande
(University of Valencia)
16/10/2008 15:00
In order to discuss the stability of four–quark states against dissociation into two isolated
mesons we shall present in this talk an exact method to study four-quark systems based on the hyperspherical harmonics formalism. We shall apply it to several physical systems of interest containing two heavy and two light quarks using different non–relativistic quark-quark potentials. Our...
Prof.
Jean-Marc Richard
(LPSC, University of Grenoble, France)
16/10/2008 15:35
The quark--antiquark confining potential, V2(r)=r (in appropriate units) is generalised to baryons as
V3=min(d1+d2+d3), where di is the distance of the ith quark to a junction whose location is adjusted to minimise the interaction. Hence estimating V3 involves solving the famous Fermat--Torricelli problem.
The extension to the tetraquark problem, initiated by several authors, has been...
Dr
Lucas Platter
(Ohio State University)
16/10/2008 16:10
The zero range model with proper renormalization is a powerful too calculate a variety of interesting low-energy observables in nuclear and atomic physics. In the three-body sector this approach reveals many interesting features (such as approximate discrete scale invariance) of systems with large scattering length.
In my talk I will discuss the zero-range in the more general context of...
Dr
Jose D'Incao
(U. Colorado)
16/10/2008 17:00
In this talk, I will discuss general properties of few-body collisions and their influence
on ultracold quantum gases in the regime where interatomic interactions are strongly
affected by a Feshbach resonance. Since the early days of the achievement of Bose-Einstein
condensation, it has been recognized that few-body processes are of crucial importance in
determining the stability of...
Dr
Francesca Ferlaino
(Institut für Experimentalphysik and Institut für Quantenoptik und Quanteninformation, Innsbruck, Austria)
16/10/2008 17:35
Ultracold atomic gases are versatile systems to study few-body physics because of full control
over the external and internal degrees of freedom. The scattering properties can be controlled
because of the magnetic tunability of the two-body scattering length in the proximity of a Fes-
hbach resonance and weakly bound dimers can be produced. Here, we experimentally explore
three- and...
Prof.
PABLO VILLARREAL
(INSTITUTO DE FISICA FUNDAMENTAL (CSIC))
17/10/2008 09:00
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...
Dmitri Fedorov
(Aarhus University)
17/10/2008 09:35
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...
Prof.
Sergy Yu. Grebenshchikov
(Max-Planck-Institut für Dynamik und Selbstorganisation, Göttingen)
17/10/2008 10:10
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...
Prof.
Tobias Frederico
(ITA, São José dos Campos, Brazil)
17/10/2008 11:00
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...
Joseph Macek
(University of Tennessee and Oak Ridge National Laboratory)
17/10/2008 11:35
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...
Dr
Dmitry Gridnev
(Post Doc)
17/10/2008 15:00
Talks at Critical Stability V (Erice, October 2008)
Dr
Mario Gattobigio
(Institut Non Lineaire de Nice - Universite de Nice)
17/10/2008 15:35
The Hyperspherical Harmonic (HH) method has been widely used in nuclear
physics to describe nuclei with A=3,4 [1].
The extension to larger systems is hampered by the large degeneracy of the HH
basis. The construction of specifically anti-symmetric states reduces the
dimensionality of the basis but encounters technical and numerical
difficulties.
The coefficients of anti-symmetric...
Dr
Paolo Barletta
(University College London, London, UK)
17/10/2008 16:10
Prof.
Holger Waalkens
(Department of Mathematics, University of Groningen, Nijenborgh 9, 9747 AG Groningen, the Netherlands)
17/10/2008 17:00
Dr
Indranil Mazumdar
(Tata Institute Of Fundamental Research, Mumbai)
17/10/2008 17:35
Prof.
Oleg O. I. Kartavtsev
(Dubna, Russia)
Normal
During the recent years, there is a continuous interest to the experimental and theoretical
study of the 12 C nucleus [1, 2, 3, 4]. In this respect, of special importance is the description
of the Hoyle state, which was predicted more then 50 years ago merely from the abundance
of elements in the universe. Whereas the Hoyle state is fairly well studied experimentally,
e. g., its...
Mikhail Krivoruchenko
(Institute for Theoretical and Experimental Physics, Moscow)
Talks at Critical Stability V (Erice, October 2008)
Normal
Talks at Critical Stability V (Erice, October 2008)
Normal
A low energy effective theory based on a microscopic multi-channel
description of the atom-atom interaction is derived for the scattering
of alkali atoms in different hyperfine states [1]. This theory
describes all scattering properties, including medium effects, in
terms of the singlet and triplet scattering lengths and the range
of the atom-atom potential and provides a link between a...
Talks at Critical Stability V (Erice, October 2008)
Normal
Talk by Elena Kolganova
