The Program was preceded by the 7th ANL/JINA/MSU annual FRIB workshop on "Interfaces between Nuclear Reactions and Structure" which was held from August 8-12, 2011 [Organizers B. A. Brown (Chair), P. Danielewicz, G. F. Bertsch]. The talk-intensive workshop had a large input from experimentalists, who were encouraged to formulate charges and challenges to nuclear structure and reaction theory that could both influence and benefit experimental nuclear physics research programs. The experimental talks included the topics of one-nucleon transfer and knockout reactions; two-particle transfer, two-particle knockout and two-particle decay; charge-exchange reactions and their connections to nuclear astrophysics; and medium to high energy heavy-ion reactions. Discussions included: What is the role of nuclear correlations on the one-particle transfer form factors. What is the role of pairing (T=1) and proton-neutron (T=0) correlations on reaction and structure observables? What constraints can be put on the nuclear equations of state? What improvement are required for the reaction theory codes that are used to interpret the data? The pictures below give some examples from the talks of Wilton Catford and Remco Zegers on the new detector systems being used.



 

The Program consisted of seminars, group discussions and many one-on-one interactions. Group discussions included the topics of (1) making computer codes available to the practitioners, (2) the validity of the eikonal approximation, (3) the problems of center-of-mass motion in nuclear structure and reactions, (4) the nature of the Hoyle state in 12C, (5) time-dependent reaction models and (6) fusion models.

Theoretical talks were spread over the Workshop and the Program. The talks focusing on nuclear structure included the topics of ab-initio theory for light nuclei, many-body methods that include the continuum, the dependence of the overlap functions on the energy scale of the theory, mean-field models including T=1 pairing for the nuclear ground state, time-dependent mean-field approaches for nuclear excited states. The pictures below give some examples from the talks of Petr Navratil and Gaute Hagen on the theoretical formulations being used.



 

The talks focusing on reactions included the topics of coupled channels CDCC methods for light-ion reactions, coupled channels methods for sub-barrier fusion, models for radiative capture and Coulomb excitation for nuclei near the drip lines, time-dependent Hartree-Fock methods for heavy-ion fusion, applications of the dispersive optical model for one-nucleon overlap functions, and transport and quantum hydrodynamics models for intermediate energy reactions.

As an outcome of the Program, the organizers and participants have contributed to a white-paper that outlines in detail the specific needs for improvements in reaction theory and related reaction theory computer codes. The participants also agreed to support a website where the commonly used computer codes and documentation could be accessed by the theoretical and experimental practitioners.

The Workshop and Program were successful in illuminating the theoretical problems that need to be solved for understanding the rich nuclear landscape from stable to neutron-rich nuclei (below left), and their implications for nuclear astrophysics such as the properties of neutron stars (below right).



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