North Carolina State University
Chalmers University of Technology,
Argonne National Laboratory
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INT Program INT-12-3|
Light nuclei from first principles
September 17 - November 16, 2012
The past decade has been revolutionary for nuclear physics. We have
seen the emergence of new and improved theories and
computational methods leading to remarkable progress in our
understanding of the nuclear force and our ability to describe
nuclei from first principles. In this pursuit, the study of light
nuclei provides an important challenge and testing ground. In this
nine-week program dedicated to the physics of light nuclei we
address the following topics:
Effective field theories (EFT's) have improved our
understanding of the nuclear force, enabling precise
calculations of observables in few-nucleon systems.
EFT's connect the nuclear force to the underlying microscopic
theory of quantum chromodynamics.
In the future it will be possible to extract the parameters of
nuclear EFT's directly from lattice QCD simulations.
- Effective field theories for nuclear forces
- Few body systems
- Nuclear structure
- Ab initio methods
- Electroweak properties
New computational methods and increased computational power with
parallel supercomputers have made possible ab initio calculations
for systems well beyond just a few nucleons. Complementary to these large system calculations, high precision few-body calculations provide benchmark tests of our understanding
of the nuclear forces and higher-body interactions.
observables provide additional benchmarks and are important input
to many other applications. This includes astrophysical processes such as big bang and
stellar nucleosynthesis as well as scattering observables for nuclei used
in beam targets and neutrino detectors.
Accurate description of electroweak observables and reactions requires not only an accurate nuclear Hamiltonian but also nuclear currents consistent with that Hamiltonian. EFT provides a theoretical framework for the derivation of the force and current.
Two workshops are planned during the course of the program
Some questions to be addressed
- Week 4: Oct. 8 - Oct. 12, "Structure of light nuclei"
This workshop aims to explore nuclear structure, nuclear forces, and ab initio methods.
(Organizers: Dean Lee, Petr Navratil, Thomas Papenbrock) Website
There is a registration fee of $50 to attend this workshop. You may pay in cash - exact change
preferred - or by a check drawn on a U.S. bank. Sorry, we cannot accept credit cards.
- Week 8: Nov. 5 - Nov. 9 "Electroweak properties of light nuclei"
This workshop will investigate electroweak properties of light nuclei in connection
with recent and future experiments.
(Organizers: Nir Barnea, Jerry Feldman, Lucas Platter) Schedule
There is a registration fee of $45 to attend this workshop. You may pay in cash - exact change preferred -
or by a check drawn on a U.S. bank. Sorry, we cannot accept credit cards.
Effective field theory for nuclear forces
Can EFT potentials describe the properties of light nuclei?
Can EFT be extended to the momentum scale of nuclear matter?
Light nuclei are sensitive to several different momentum scales. Can we nonetheless obtain a priori estimates for observables of light nuclei?
Can a high precision EFT potential be constructed for ab initio
calculations while simultaneously describing the pion mass dependence of the
What further input is needed for calculations of hypernuclei and
EFT applied to hyperon-nucleon and hyperon-hyperon potentials?
Ab initio methods
What can be done to overcome computational limits on particle
How can EFT potentials be adapted for use in quantum Monte Carlo
What role will the various methods (no-core shell model, coupled cluster, quantum Monte Carlo, correlated Gaussians, auxiliary field diffusion Monte Carlo, lattice effective field theory, lattice QCD, etc.) play in future nuclear structure calculations?
How shall we address reaction processes in a continuum that contains both
narrow and wide resonances?
What new problems can we now solve that were impossible
several years ago?
How general and robust are the methods and what are the
systematic errors? Can a priori error estimates be made?
What new algorithms can be transferred or adapted from one method to another?
How can raw data such as nuclear wavefunctions produced in
large-scale calculations be used by the larger theory community?
How can ab initio calculations assist lattice QCD calculations
of the low-energy EFT parameters?
Are there any further interconnections between the parameters of the
nuclear Hamiltonian and currents?
There are indications that EFT-based currents can explain the
observed quenching of g_A in large nuclei. To what extent can ab initio calculations test this explanation?
What are the most probing observables to pin down the nuclear Hamiltonian and currents?
What additional information about higher-body forces can be obtained from
Can EFT's be used to describe electron scattering at medium and high energies?