Dr
Ubirajara van Kolck
(IPN Orsay)
08/10/2012 10:45
Ab-initio approaches to nuclear structure
The No-Core Shell Model is a powerful method to calculate nuclear properties starting from internucleon interactions. As in the traditional Shell Model, effective interactions have to be constructed for the model space where the Schroedinger equation is solved. I discuss how this can be done systematically and consistently with the underlying theory of strong interactions, QCD, using effective...
Dr
Barbieri Carlo
(University of Surrey)
08/10/2012 11:30
Ab-initio approaches to nuclear structure
The talk discusses recently achieved proof-of-principle calculation based on Gorkov-Green's function theory. The method allows first principle calculations of truly open shell, semi-magic, nuclei and has been applied successfully up to Ni-78 with soft low-momenutm interactions. The inclusion of three-nucleon forces has also been demonstrated by calculations within the Green's function...
Mlle
Marianne DUFOUR
(Université de Strasbourg)
08/10/2012 12:10
Ab-initio approaches to nuclear structure
The transition from descriptions of nuclear-wave functions in terms of A nucleons (fermions)
toward those in terms of n < A composite clusters as e.g. particles (bosons) is far from being
obvious. However, it represents a very interesting challenge which can help to point out states
in which clustering is expected to be strongly dominant as in so-called condensate state, a
typical...
Silvia Lenzi
(University of Padua and INFN)
08/10/2012 14:00
Nuclear structure at the proton dripline
The study of isospin symmetry in nuclei as a function of angular momentum is a very powerful tool to understand nuclear
properties in rotating nuclei. These studies have become feasible in the last decade due to recent experimental
developments in the identification of proton-rich nuclei produced with very low cross sections. Contemporaneously,
state-of-the-art shell-model codes have been...
Dr
Nadya Smirnova
(CENBG)
08/10/2012 14:40
Nuclear structure at the proton dripline
Although the breaking of the isospin symmetry in nuclei is small,
there are numerous demands for its accurate description by theoretical models. In particular, the effects of the Coulomb force are vital for understanding the structure of proton-rich nuclei and for description of isospin-forbidden decay modes. Another important issue is calculation of isospin-symmetry breaking corrections to...
M.
Yek Wah Lam
(Université Bordeaux 1, CNRS/IN2P3, Centre d’Etudes Nucléaires de Bordeaux Gradignan, CENBG, Chemin du Solarium, BP120, 33175 Gradignan, France.)
08/10/2012 15:00
Nuclear structure at the proton dripline
Dr
Florent HAAS
(IPHC, Srasbourg)
08/10/2012 15:20
Nuclear structure at the proton dripline
In the level scheme of sd shell nuclei,there is generally at relatively low excitation energies,coexistence of 'normal' positive parity states and of 'intruder' negative parity states.The aim of our work is to describe these intruder states in the full p-sd-pf model space with a 4He core and allowing for one nucleon jump between the major shells.To construct our PSDPF interaction,we first...
Dr
Mouna Bouhelal
(Laboratoire de Physique Appliquée et Théorique, Université de Tébessa, Tébessa, Algérie)
08/10/2012 15:50
Nuclear structure at the proton dripline
A comparison of the structure properties of 22Ne and 22Mg is interesting because in nucleosynthesis 22Mg can be formed through the capture reaction 21Na(p,gamma) for which the cross sections will depend on spin-parity assignments of the 22Mg states around the proton-emission threshold .
For the pair 22Ne-22Mg, our calculations using the PSDPF interaction predict fifteen states in the...
Dr
sorlin olivier
(GANIL)
08/10/2012 16:50
Shell evolution in the neutron rich nuclei I
The present talk will present recent experimental studies aiming at
studying the spin-orbit interaction and
the evolution of the proton-neutron force when approaching the drip-line.
For the former subject, we propose to use the bubble nucleus 34Si to probe
the two-body spin orbit interaction. This study can be also used to test
the validity of mean field approaches which predict a density...
Dr
Stéphane Grévy
(CENBG)
08/10/2012 17:30
Shell evolution in the neutron rich nuclei I
The 0+2 state in 34Si has been populated at the Ganil/Lise3 facility through the -decay of a newly discovered 1+ isomer in 34Al of 26(1) ms half-life. The simultaneous detection of e+e-
pairs allowed the determination of the excitation energy E(0+2)=2719(3) keV and the half-life T1/2=19.4(7) ns, from which an electric monopole strength of rho^2(E0)=13.0(0.9)*10-3 was deduced. The 2+1 state is...
Dr
Laurent Gaudefroy
(CEA-DAM)
08/10/2012 17:50
Shell evolution in the neutron rich nuclei I
The structure of neutron rich Sulfur nuclei has been the recent subject of both experimental and theoretical studies. At N=28, experimental data interpreted within the shell model framework suggested a prolate/spherical shape coexistence. Similar interpretation has been proposed at N=27 for 43S. Recent beyond mean field calculations suggested a more complicated low-lying structure of neutron...
M.
Johannes Simonis
(TU Darmstadt)
08/10/2012 18:30
Shell evolution in the neutron rich nuclei I
In the framework of chiral effective field theory, a systematic expansion for nuclear forces, it is possible to obtain valence shell interactions for nuclear structure calculations. These are obtained by applying many-body perturbation theory (MBPT) to a renormalization group (RG) evolved low-momentum interaction. In this approach three-nucleon forces are included naturally. Normal-ordered...
Marek Ploszajczak
(GANIL)
09/10/2012 09:00
Weakly-bound quantum systems and reactions
We will review recent progress in the Shell Model description of nuclear open quantum systems by introducing the Gamow
Shell Model and the real-energy Continuum Shell Model. The interplay between Hermitian and anti-Hermitian (through the
decay channels) configuration mixing in open quantum systems creates complicated collective phenomena such as the
resonance trapping and the...
Jaume Carbonell
(LPSC)
09/10/2012 09:40
Dr
Rimantas Lazauskas
(IPHC Strasbourg)
09/10/2012 10:10
Weakly-bound quantum systems and reactions
Regardless of its importance, the theoretical description of the quantum-mechanical collisions turns out to be one of the most complex and slowly advancing problems in theoretical physics. If during few last decades exact numerical solutions for bound states of several nucleons became available, the full solution of the scattering problem (containing elastic, rearrangement and breakup...
Prof.
Jesús Navarro
(IFIC (CSIC-University of Valencia), Spain)
09/10/2012 10:40
Weakly-bound quantum systems and reactions
Helium droplets are weakly bound quantum systems as a consequence of the small atomic mass and the weak van der Waals interaction between helium atoms. They offer the opportunity of studying systems formed by bosons and fermions with different mass interacting through the same potential. These seemingly quite different systems have nevertheless a strong conceptual overlap with atomic nuclei....
Dr
Hubert Grawe
(GSI)
09/10/2012 11:40
Proton rich nuclei in the vicinity of 100Sn
The race for 100Sn -- History of experimental and shell model approach
H. Grawe1, M. Górska1, T. Faestermann2
1 GSI Helmholtzgesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany
2 Physik Department E12, Technische Universität München, D-85748 Garching, Germany
The nuclear structure of 100Sn and its neighbours as result of about 50 years of experimental
and shell model...
Andrey Blazhev
(IKP, University of Cologne)
09/10/2012 12:25
Proton rich nuclei in the vicinity of 100Sn
Isomers in regions around magic and doubly-magic nuclei allow for testing and tuning shell-model interactions and single particle energies and help for understanding of nuclear structure. Experimental transition strengths allow for determination of effective charges, while core-excited isomers manifest the shell gap and stress the importance of particle-hole excitations of the magic core.
In...
Dr
David Verney
(IPN Orsay)
09/10/2012 14:10
Shell evolution in the neutron rich nuclei II
Considerable efforts have been recently deployed in order to reach experimentally the region in the immediate vicinity of 78Ni to assess the doubly magic character of this very neutron rich nucleus. The PARRNe ISOL device has been operating at IPN Orsay since more than a decade. Originally conceived as a test bench for R&D studies in the framework of the SPIRAL2 project, the performance of the...
Dr
Mohamad Moukaddam
(Université de Strasbourg, IPHC, 23 rue du Loess, F-67037 Strasbourg, France, CNRS, UMR7178, F-67037 Strasbourg, France)
09/10/2012 14:50
Shell evolution in the neutron rich nuclei II
It has been shown that the neutron 2d5/2 orbital has to be included in shell-model calculations to explain the appearance of large quadrupole collectivity observed in the neutron rich Fe and Cr of the N ≈ 40 region. This work initiated by Caurier et al. has been recently revisited. Calculations in a large valence space involving the fp proton shell and the fpgd neutron shells including a...
Dr
Angela Gargano
(INFN-Napoli)
09/10/2012 15:10
Shell evolution in the neutron rich nuclei II
Over the past several years various shell-model studies have been
performed for neutron-rich nuclei beyond 132Sn, all leading to
spectroscopic properties in very good agreement with the experimental data (see for instance [1,2] and references therein). In these works, a unique Hamiltonian has been used with the single-particle energies taken from the experiment and the two-body effective...
Dr
Jose Javier Valiente Dobon
(Laboratori Nazionali di Legnaro (INFN))
09/10/2012 15:50
Shell evolution in the neutron rich nuclei II
Electromagnetic transition rates, in particular for E2 transitions, are a sensitive and well-studied probe of nuclear structure: their dependence on the nuclear wave function offers the possibility of strict tests of theoretical models. Usually, B(E2) rates are calculated in a restricted shell-model space and they are then renormalized with constant effective charges. However, even large-scale...
Dr
Luis Robledo
(Universidad Autonoma de Madrid)
10/10/2012 09:30
Recent progress in the nuclear shell model and other approaches to nuclear structure
Two items will be addressed in this talk, the first concern
developments to compute the overlaps required for beyond
mean field theories of the HFB type. They are based on the
powerful concept of the Pfaffian of a skew symmetric matrix
and are specially useful for odd-A systems where time
reversal invariance is broken.
The second concerns a recently proposed energy density
functional...
Jose Gomez
(Universidad Complutense de Madrid)
10/10/2012 10:15
Recent progress in the nuclear shell model and other approaches to nuclear structure
In the last decade or so, the study of chaos in nuclei and other quantum systems has been a very active research field. Besides work based on random matrix theory, new theoretical developments making use of information theory, time series analysis, and the merging of thermodynamics and the semiclassical approximation have been published [1]. In this talk, a survey of chaotic dynamics in...
Dr
Víctor Velázquez
(Universidad Nacional Autónoma de México)
10/10/2012 11:25
Recent progress in the nuclear shell model and other approaches to nuclear structure
The atomic nucleus is a many-body quantum system, where both the excitation energies and the wave functions can show specific correlations. From Random Matrix Theory, we know that these correlations are related to the underlying nuclear dynamics. In this work, we analyze concepts like complexity, scale invariance and sensitivity in the framework of the nuclear shell model, in the JT-scheme for...
Dr
Qijun Zhi
(TU Darmstadt)
10/10/2012 12:00
Recent progress in the nuclear shell model and other approaches to nuclear structure
We have performed large-scale shell-model calculations of the
half-lives and neutron-branching probabilities of the r-process
waiting point nuclei at the magic neutron numbers N=50, 82, and 126. The calculations include contributions from allowed Gamow-Teller and, for the first time, also from first-forbidden transitions. We find good agreement with the measured half-lives
for the N=50...
Frédéric PERROT
(CNRS/IN2P3/Bordeaux1)
10/10/2012 13:45
Beta-beta decays and other rare processes
In my talk, I will present a status of various double beta decay experiments. Especially, I will focused on the various experimental approaches, the background of these experiments, their results or expected results on double-beta 2 and 0-neutrino half-lives and the corresponding limit on the effective neutrino mass.
Dr
Tomás Rodríguez
(Technische Universität Darmstadt)
10/10/2012 14:25
Beta-beta decays and other rare processes
In this presentation I will summarize some recent calculations of the nuclear matrix elements (NME) for neutrinoless double beta decay performed within the energy density functional framework. In particular, I will focussed on the role of pairing, deformation and shell effects in the NME values.
Dr
Javier Menéndez
(Technical University Darmstadt)
10/10/2012 15:05
Beta-beta decays and other rare processes
Neutrinoless double beta (0nbb) decay is a unique process because, if
detected, it will imply the Majorana nature of neutrinos. Moreover,
once an experimental lifetime will be measured, with the nuclear
matrix elements (NMEs) very important information about the hierarchy
an absolute masses of the neutrinos will be known.
Therefore, a reliable calculation of the NMEs is crucial....
Dr
Basil Grammaticos
(IMNC Univ. Paris 7 & Paris 11)
10/10/2012 16:00
We begin with a study of the migratory behaviour of cells stemming from a brain tumour. Based on experimental data we study the interaction of cells, its effect on migration with emphasis on the interaction inhibition.
A cellular automaton model allows to describe the situation and quantify the interaction. In order to investigate possible clinical applications of inhibition, we introduce a...
