Prof.
Jan Michael Rost
(MPIPKS Dresden)
13/10/2014 09:00
Exposed to intense X-ray pulses, molecular Hydride clusters eject protons thereby reducing the charge imbalance generated by the X-ray photo ionisation. The consequence is a transient stabilisation of the heavy ions of the cluster backbone leading to a delayed Coulomb explosion. The mechanism behind the effect will be explained which will also elucidate why this peculiar dynamics only occurs...
Prof.
Carlos Bertulani
(Texas A&M University-Commerce)
13/10/2014 09:40
The quantum dynamics of an ultracold diatomic molecule tunneling and diffusing in a one-dimensional optical lattice exhibits unusual features. While it is known that the process of quantum tunneling through potential barriers can break up a bound-state molecule into a pair of dissociated atoms, interference and reassociation produce intricate patterns in the time-evolving site-dependent...
Dr
Ubirajara van Kolck
(IPN Orsay and U of Arizona)
13/10/2014 11:00
I will show how nuclear structure can be predicted from lattice QCD through low-energy effective field theories (EFTs), using as an example simulations of a world with relatively heavy quarks. At distances scales much larger than the inverse pion mass few-nucleon systems are described by an EFT where the leading interactions are contact two- and three-body forces, which explicitly incorporate...
Brett Carlson
(Instituto Tecnológico de Aeronáutica)
13/10/2014 11:40
Deuteron-induced reactions are being used to produce medical radioisotopes [1] and as surrogates to other reactions (see review [2] and references therein), among recent applications. Although they have been studied for decades [3-6], the complexity of these reactions continues to make their theoretical description challenging. The direct reaction mechanism is a major contributor to the...
Prof.
Yusuke Nishida
(Tokyo Institute of Technology)
13/10/2014 15:00
Physics is said to be universal when it emerges regardless of microscopic details. The most remarkable example is the Efimov effect, which predicts the emergence of an infinite tower of three-boson bound states in three dimensions with binding energies obeying the universal exponential scaling. In this talk, I will discuss our recent proposal for its condensed matter realization, namely, the...
Dr
Servaas Kokkelmans
(Eindhoven University of Technology)
13/10/2014 15:40
Efimov physics in ultracold gases is described very well by the universal scaling laws, based on the scattering length and van der Waals length. The first can be tuned magnetically via a Feshbach resonance, the second is constant and connected to the radial range of the potential. However, experimental hints at non-universal behavior, when going away from resonance, are quite badly understood....
Dr
Christian Forssén
(Chalmers University of Technology)
13/10/2014 17:00
Small open quantum systems are intensely studied in various fields of physics. The properties of such systems are profoundly affected by their environment, such as the continuum of decay channels. In spite of their specific features, they also display generic properties that are common to all weakly bound/unbound systems close to threshold. This implies that similar universal few- and...
Dr
Maurizio Rossi
(Università degli Studi di Padova)
13/10/2014 17:40
We investigate the zero-temperature properties of a diluted homogeneous Bose gas made of N particles interacting via a two-body square-well potential by performing Monte Carlo simulations. We tune the interaction strength to achieve arbitrary positive values of the scattering length and compute by Monte Carlo quadrature the energy per particle E/N and the condensate fraction N_0/N of this...
Prof.
Chris Greene
(Purdue University)
14/10/2014 09:00
Recent studies using the adiabatic hyperspherical representation have helped to provide an understanding of the universal three-body parameter for both homonuclear and heteronuclear systems characterized by van der Waals plus short-range interactions. This talk will discuss the current state of theoretical analyses of this important aspect of the universal Efimov effect, and what has been...
Prof.
Lev Khaykovich
(Department of Physics, Bar Ilan University, Ramat Gan, 52900 Israel)
14/10/2014 09:40
In my talk I shall overview our experimental studies of the three-body recombination process in a gas of ultracold lithium atoms. In the regime of resonant interatomic interactions we identify the characteristic features of Efimov trimers [1]. In the opposite regime of vanishingly weak interactions, where no universal bound states are expected, we discover a surprisingly simple behavior. We...
Dmitri Fedorov
(Aarhus University)
14/10/2014 11:00
The three-body recombination rates in cold atomic gases typically exhibit certain universal features --- often referred to as Efimov physics --- which can be described within a model-independent theory using only very few of the low-energy parameters of the inter-atomic interactions.
In this contribution we specifically consider recombination into expressly non-universal deep dimers. Even...
Dr
Pierre Descouvemont
(Universite Libre de Bruxelles)
14/10/2014 15:00
Owing to the unusually large radius of halo nuclei, their interaction with a target extends to large distances, in comparison with non-halo nuclei. This property has important consequences on the calculation of the cross sections. On the other hand, halo nuclei are weakly bound, and present a low breakup threshold. Consequently, breakup channels must be included for a realistic description of...
Dr
Rubens Lichtenthaler
(USP)
14/10/2014 15:40
Light neutron rich nuclei such as 6He and 11Li have a pronounced halo structure with very low binding energies. These features have consequences in the shape of their elastic scattering angular distributions as well as in the total reaction cross sections. We will present experimental data of elastic scattering and reactions induced by these light exotic nuclei on targets of different...
Dr
Miguel Marques
(LPC-Caen)
14/10/2014 17:00
The Radioactive Isotope Beam Factory (RIBF) at RIKEN, Tokyo, has become the world's most powerful machine for the production of exotic nuclei. At intermediate masses, it is pushing the frontier of existence towards areas until now inaccessible, and below Fluorine it is leading us even beyond. After a brief description of the facility, we will see the very preliminary results of the first...
Prof.
Renato Higa
(Physics Institute, University of Sao Paulo)
14/10/2014 17:40
Loosely bound nuclei far from the stability region emerge as a quantum phenomenon with many universal properties. The connection between these properties and the underlying symmetries can be best explored with halo/cluster EFT, an effective field theory where the softness of the binding momentum and the hardness of the core(s) form the expansion parameter of a given perturbative approach. In...
Prof.
Alinka Lépine-Szily, Prof.
Carlos Bertulani
(Texas A&M University-Commerce), Prof.
Luiz Felipe Canto
(Universidade Federal do Rio de Janeiro)
14/10/2014 18:20
Prof.
Arnaldo Gammal
(Universidade de Sao Paulo)
15/10/2014 09:00
We investigate by numerical simulations the pattern formation after an oscillating attractive-repulsive obstacle inserted into the flow of a Bose-Einstein condensate. For slow oscillations we observe a complex emission of vortex dipoles. For moderate oscillations organized lined up vortex dipoles are emitted. For high frequencies no dipoles are observed but only lined up dark fragments. The...
Sadhan Adhikari
(São Paulo State University, Institute of Theoretical Physics)
15/10/2014 09:40
Trapped degenerate dipolar Bose and Fermi gases of cylindrical symmetry
with the polarization vector along the symmetry axis are only stable for the strength
of dipolar interaction below a critical value. In the case of bosons, the stability of
such a dipolar Bose-Einstein condensate (BEC) is investigated for different strengths
of contact and dipolar interactions using variational...
Dr
jiang min zhang
(max-plank-institute-PKS)
15/10/2014 11:00
We study the one dimensional two-particle Bose-Hubbard model with a defect site. The continuum case of the model was claimed by McGuire to be nonintegrable fifty years ago, but now it is shown that the odd parity sector is integrable. More precisely, the odd-parity eigenstates are all in the Bethe-form.
Interestingly, this model offers a long-sought kind of exotic bound state: Bound state...
Dr
Mônica Andrioli Caracanhas
(Universidade de São Paulo)
15/10/2014 11:40
Turbulence is characterized by chaotic spinning flow regimes which appear in many important processes in nature. Vorticity, in superfluid systems, may present the simplest form of turbulence, and be a gateway to the study of this phenomenon in quantum gases. A 87Rb Bose condensate is used to observe and investigate quantum turbulence, by means of a weak, off-axis, magnetic field gradient,...
Dr
Marios Tsatsos
(Instiitute of Physics Sao Carlos, University of Sao Paulo)
15/10/2014 12:20
Superfluids are distinguished from ordinary fluids by the quantized manner the rotation is manifested in them. Precisely, quantized vortices are known to appear in the bulk of a superfluid subject to external rotation, beyond a critical velocity. In most of the studies so far the quantum fluids are considered to be coherent and condensed at all times. In this work I present two examples of...
M.
Jean-Marc Richard
(IPNL)
16/10/2014 09:00
We revisit the spectroscopy and some production mechanisms of light hypernuclei with single or double strangeness. There is already an abundant literature on the subject [1-4], and we generally recover the published results. We first review the rigorous limits on the possibilities of “Borromean” binding, i.e., bound
states whose subsytems and unbound, and discuss whether novel possibilities...
Dr
Elena Kolganova
(BLTP JINR)
16/10/2014 11:40
This work is devoted to the theoretical study of the properties of rare gas clusters. Spectra and wave functions are calculated for dimers of the atoms He, Ne, Ar, Kr, Xe and Rn. Calculations were performed for all possible homogeneous and heterogeneous pairs of rare gas atoms. The Tang - Toennies, Aziz and Lennard - Jones potential models are used for description the interatomic...
Prof.
Nir Barnea
(The Hebrew University of Jerusalem)
16/10/2014 15:00
The nuclear neutron-proton contact is introduced, generalizing Tan's work, and evaluated from medium energy nuclear photodisintegration experiments. To this end we reformulate the quasi-deuteron model of nuclear photodisintegration and establish the bridge between the Levinger constant and the contact. Using experimental evaluations of Levinger's constant we extract the value of the...
Prof.
ANTONIO DELFINO
(INSTITUTO DE FISICA, UNIVERSIDADE FEDERAL FLUMINENSE)
16/10/2014 15:40
A nonrelativistic (NR) limit of a Point-Coupling version of a Relativistic Mean-Field (RMF) is constructed to investigate nuclear matter properties. This limit allows for nuclear matter bulk parameter analytical expressions. Correlations between many-nucleon bulk parameters as
nuclear matter symmetry energy, its slope, and curvature are presented from this nonrelativistic solvable approach....
Dr
Rimantas Lazauskas
(IPHC Strasbourg)
16/10/2014 17:00
The main difficulty to solve the scattering problem in configuration space is related to the fact that the scattering wave functions are not localized. One is therefore obliged to find solutions for multidimensional differential equations, which satisfy extremely complex boundary conditions. Finding a method which enables us to solve the scattering problem without an explicit use of the...
Prof.
Anna Okopińska
(Jan Kochanowski University)
16/10/2014 17:40
The stability of the quasi one-dimensional quantum dot composed of two Coulombically interacting electrons confined in an inverse Gaussian potential is discussed. Apart from bound states, the system exhibits resonances that are related to the autoionization process. Employing the complex-coordinate rotation method, we determine the resonance widths and energies and study their dependence on...
M.
Nikolaj Zinner
(Aarhus University)
17/10/2014 09:00
I will present our latest progress on strongly interacting few-body systems in one-dimensional geometries. I will consider both fermionic and bosonic systems in a variety of geometries with particular emphasis on manipulation of the eigenstates and dynamics of the system by engineering the external confinement.
M.
Filipe Furlan Bellotti
(Instituto Tecnológico de Aeronáutica / Aarhus University)
17/10/2014 09:40
Quantum systems composed of three particles with attractive zero-range pairwise interactions are considered for general masses and interaction strengths in two dimensions (2D). The number of bound states in a 2D three-body system increases without bound as the mass of one particle becomes much lighter than the other two. The adiabatic approximation provides an analytic form of the effective...
D. Blume
(Washington State University)
17/10/2014 11:00
Three identical bosons at zero temperature exhibit the Efimov effect if the magnitude of the s-wave scattering length is much larger than the other length scales of the underlying two-body potentials. This talk discusses extensions of the Efimov scenario to more than three particles. Two different systems are considered: First, the properties of N identical bosons interacting through...
Dr
Mario Gattobigio
(Université de Nice - INLN)
17/10/2014 11:40
In this talk I will illustrate the universal behaviour that we have found inside the window of Efimov physics for systems made of N≤6 particles [1]. We have solved the Schroedinger equation of the few-body systems using different potentials, and we have changed the potential parameters in such a way to explore a range of two-body scattering length, a, around the unitary limit, |a| → ∞. The...
Dr
Marcelo Yamashita
(IFT)
17/10/2014 15:00
A remarkable effect related to the dimensionality of the system occurs in the spectrum of three-boson systems in the universal limit of short-range interactions when passing from three (3D) to two (2D) dimensions. In this case, for a two-body energy (E_2) equal zero, the infinite number of three-body bound states, which comes as a consequence of the Efimov effect, disappears because in 2D...
Eva Kuhnle
(Heidelberg University)
17/10/2014 15:40
We present the observation of two consecutive heteronuclear Efimov resonances in an ultracold Fermi-Bose mixture of Li-Cs by measuring magnetic field dependent three-body loss coefficients and atom loss spectra near a broad Feshbach resonance. The first Efimov resonance is found at a scattering length of a(0)=-320(10)a0, corresponding to approximately 7(3) times the Li-Cs (Cs-Cs) van der Waals...
Dr
Renat Sultanov Sultanov
(St. Cloud State University)
17/10/2014 17:00
Recent progress in creation of ultra-slow anti-protons, p ̄, [1] is of considerable scientific interest, because of possible formation of low-energy anti-hydrogen atoms H ̄: a bound state of p ̄ and a positron e+. The main goal of the anti-hydrogen/antimatter research is to check and confirm (or not confirm) certain fundamental laws and theories of modern physics. For example, one of the most...
Prof.
Manuel Malheiro
(Instituto Tecnologico de Aeronautica)
17/10/2014 17:40
We present some results for pairing in nuclear matter using a relativistic formalism investigating its density dependence, and also how the singlet pairing state changes with temperature for some spherical and deformed nuclei. We will discuss some astrophysical implications of these results, namely the pairing of neutron in the singlet and triplet states, which reduces the neutrino emission...
M.
Cristian Gutierrez
(Instituto de Fisica Teorica/UNESP)
The Nakanishi perturbative integral representation of the Bethe-Salpeter (BS) amplitude in three-dimensions (2+1) is investigated in order to derive a workable framework for bound states in Minkowski space. The projection onto the null-plane of the three-dimensional homogeneous BS amplitude is used to derive an equation for the Nakanishi weight function. The formal development is illustrated...
Dr
elena santopinto
(INFN)
Charmonia and bottomonia spectroscopy will be discussed in an unquenched quark model.
Dr
Wayne de Paula
(Instituto Tecnologico de Aeronautica)
We formulate out-of-plane displacements of graphene as a spatial-curvature and we obtain the corresponding Dirac equation for a general geometry. An analytical solution of the Dirac equation in a curved space for a general deformation along one spatial direction is derived, and it amounts to an extra phase in the electron wavefunction. This can be explored to produce interference devices of...
Mme
Bianca Martins Santos
(Universidade Federal Fluminense)
By using a nonrelativistic limit based at point-coupling versions of finite range nuclear relativistic mean-field models containing cubic and quartic self interactions in the scalar field, we derive the analytical expressions for pressure, chemical potential and energy per particle expanded up to sixth-order in isospin asymmetry parameter. In the expansion, the thermodynamic consistency...
Dr
Mahdi Ahmadian Shalchi
(Instituto de Física Teórica - IFT / UNESP)
Two- and three-particles photodisintegration of the triton is investigated in a three-dimensional
(3D) Faddeev approach. For this purpose the Jacobi momentum vectors for three-particles system and spin-isospin quantum numbers of the individual nucleons are considered. Based on this picture the three- nucleon Faddeev integral equations with the two-nucleon interaction are formulated without...
