Seminars

Monday, Aug 07 at 11:00 AM
NSCL Lecture Hall 1200
Cedric Simenel, The Australian National University
Probing quantum many-body dynamics with nuclei

Abstract:  The quantum many-body problem is common to all fields aiming at describing complex quantum systems of interacting particles. Examples range from quarks and gluons in a nucleon to macromolecules such as fullerenes. Nuclear systems are another example where up to about 500 nucleons (in the case of actinide collisions) may interact. What make nuclear systems special to test quantum many-body theories is their small size (few fermi) and short “native" time scale (few zeptoseconds) ensuring the complete isolation from external environment, and then, the preservation of quantum coherence during the dynamics. Nuclei are then ideal to investigate fundamental aspects of quantum physics such as coherence and tunnelling. Predicting the outcome of heavy-ion collisions is very challenging as several reaction mechanisms may occur. Ideally, the same theoretical model should be able to describe all the outcomes, e.g., (in)elastic scattering, multi-particle transfer, and fusion. A good starting point is to consider that the particles evolve independently in the mean-field generated by the ensemble of particles. This leads to the well known time-dependent Hartree-Fock (TDHF) theory proposed by Dirac. This microscopic approach and its extensions to incorporate pairing correlations as well as quantum fluctuations are well suited to investigate the variety of nuclear reactions. An appealing aspect is that structure and reaction are described on the same footing. In addition, the only input being the choice of the energy density functional, this approach provide a solid ground to predict reaction outomes with exotic nuclei. Recent applications to nuclear vibrations, particle transfer, fusion, and fission will be discussed in the talk.

Wednesday, Aug 09 at 11:00 AM
NSCL Lecture Hall 1200
Gregory Potel, NSCL
Exploring the drip line with transfer reactions

Abstract:  Transfer reactions are a standard experimental tool for probing important aspects of nuclear structure, such as single-particle- like degrees of freedom. In order to extract the structure information from the experimental result, one usually relies on a factorization of the reaction and structure aspects of the process. This standard approach can suffer from a possible inconsistency between both calculations, blurring the message of the measured cross section. As we move away from the more safe regions along the valley of stability, different structure theory strategies are implemented in order to make reliable and predictive statements regarding the more exotic nuclei. In order to obtain unambiguous structure information from the experiments we should allow for a clean implementation of these structure models into the reaction formalism . We show recent progress towards an integrated structure + reactions framework, presenting a combined effort to produce optical potentials and effective interactions within different structure approaches and integrating them into transfer reactions calculations.

Monday, Aug 14 at 11:00 AM
NSCL Lecture Hall 1200
Kosho Minomo, Osaka University
TBA

Abstract:  TBA

Monday, Aug 21 at 8:00 AM
Grand Rapids, MI
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IBIC 2017
Thursday, Aug 24 at 4:00 PM
1309 Seminar Room
Raghav Elayavalli, Rutgers University
Title to be Announced