EURONS Activity N08
TNET
Theory Network for Nuclear Structure and Reactions

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N08-TNET, website: www.nucleartheory.net/tnet

 

 

 

Jeff Tostevin

Email:j.tostevin@surrey.ac.uk

Department of Physics
University of Surrey
Guildford

GU2 7XH

United Kingdom

                      Deliverable D-N08-3.1: Report on task T-N08-3.1
                                                                        (pdf version)

                                        Second TNET Workshop

The second TNET workshop “Theory Network for Nuclear Structure and Reactions” was held at the ECT*, Trento (IT) from Monday 7th through Friday the 11th January 2008. The acceptance of the Board of the ECT* to hold the Workshop at ECT*, the excellent support and facilities provided by the ECT* staff, especially by Ms Ines Campo, and the excellent research environment are gratefully acknowledged by the organisers.

 

The second workshop organizing committee was composed of  Jeff Tostevin (U-Surrey, Coordinator, UK), Jan Vaagen (U-Bergen, NO) and Antonio Fonseca (U-Lisbon, PT).

 

The workshop brought together the TNET nuclear structure and reactions theorists, with a track record of collaborative activity, plus students. A number of young European scientists presently working overseas also participated.

The aims of the Workshop were primarily:

(1) To share knowledge and foster further research collaboration on topical problems in nuclear reactions, structures, and their interface,

(2) To review most recent theoretical advances and understanding, as driven by new experimental capabilities,

(3) To give exposure to the state-of-the-art theoretical tools and of open questions to young scientists, and to foster younger researcher networking,

(4) To allow assessment of priorities concerning reaction theory and the reactions and structures interface as input into integrated theory themes in FP7.

 

Main themes identified for the Workshop were:

* Correlations in nuclei: their role, treatment and observation

* Novel reaction methodologies: approaches and new technologies

* Novel phenomena in the study of nuclei far from stability

* Few- and many-body methods, status, opportunities and limitations

* Experimental and theoretical reaction capabilities at new facilities

* Break-up and transfer reaction methods and spectroscopy

* Structure models at the interface with the continuum

* Priorities, future directions and (FP7) opportunities

 

The detailed programme of the workshop is given in Annex 1 and on the TNET website. The workshop talks (as pdf files) can be browsed from the TNET webpage http://www.nucleartheory.net/tnet/presentations.htm. A complete list of participants and a summary of the workshop are also given in Annex 1.

 

Second TNET Workshop / ANNEX 1

 

1. List of Participants

A total of  30 nuclear theorists, experimentalists, observers and students attended the Workshop. Participants that led discussions, and their affiliations, are listed in the Workshop programme below. In addition, student participants were Oyvind Jensen (U-Bergen), Elizabeth Cunningham, Emma Suckling and Edward Simpson (U-Surrey).

 

2. Workshop programme

Monday

 January 7th

 

 

09.00am Arrival and registration

09.30am

Ron Johnson

U-Surrey

Transfer Reactions with Deuterons

11.00am

Pierre Descouvemont

ULB Brussels

Challenges for three-body scattering problems

12.00noon

Winfried Leidemann

U-Trento

Study of reactions with the Lorentz integral transform (LIT) method

14.30pm

Mahir Hussein MPI Dresden

Absorption-fluctuation theorem for nuclear reactions

16.00pm

Raquel Crespo

IST Lisbon

Faddeev multiple scattering calculations for proton elastic and

break-up scattering from halo nuclei

Tuesday

 January 8th

09.30am

Antonio Fonseca

U-Lisbon

Three-body approach to direct nuclear reactions

11.00am

Joaquin Gomez Camacho

U-Sevilla

Algebraic approach to the scattering with internal degrees of freedom

12.00noon

Marek Ploszajczak (Lead)

GANIL

Lessons from Helsinki: Future activity

14.30pm

Antonio Moro

U-Sevilla

Extracting spectroscopic information from transfer reactions involving

weakly bound nuclei

16.00pm

Pierre Capel

ULB Brussels

Analysis of 8B break-up experiments with a Dynamical Eikonal

Approximation

Wednesday

 January 9th

09.30am

Marek Ploszajczak

GANIL

Many-body calculations for weakly-bound and unbound states

11.00am

Jimmy Rotureau

ORNL

Density Matrix Renormalization Group Approach for many body open

quantum systems

12.00noon

Sofia Quaglione

LLNL

Extending the ab initio no-core shell model to the continuum via the

resonating-group method

14.30pm

Gaute Hagen

ORNL

Coupled-Cluster Approach to Nuclear Structure

16.00pm

Markus Stauf

U-Manchester

Coupled cluster method with a hardcore potential for finite nuclei

Thursday

 January 10th

09.30am

Paul Stevenson

U-Surrey

Time-Dependent Hartree-Fock for structure and reactions

11.00am

Arnau Rios Huguet

NSCL/MSU

A time-dependent Green's functions approach to nuclear reactions

12.00noon

Hermann Wolter

U-Munich

The nuclear symmetry energy at low density

14.30pm

Marcella Grasso

Orsay

Evolution of proton states in neutron-rich Ca and Ar isotopes

16.00pm

Jeff Tostevin

U-Surrey

Observing correlations using reactions

Friday

 January 11th

09.30pm

Giuseppina Orlandini  

U-Trento

Ab-initio (LIT) method for reactions in the continuum and applications

11.00am

Haik Simon

GSI

Correlation studies in 3-body halo break-up reactions

12.00noon

Manuela Rodriguez Gallardo

U-Lisbon

Standard four-body CDCC calculations

14.00pm

Jim Al-Khalili

U-Surrey

The two-potential approach to one-proton emission

15.00am Close of Workshop

 

3. Summary of the Workshop, by the Coordinator

The workshop was able to review advances and allow discussion of open questions for a considerable range of theoretical work within and in collaboration with TNET partners. The instructions to discussion leaders was to review the current status, the underpinning theoretical methodologies, open problems and future opportunities. The resulting presentations and extensive discussions were effective in touching each of these bases.

 

Recent advances and future possibilities were revealed at the Workshop. The major methodologies, underpinning physics, and challenges to advances in direct

nuclear reactions, few-body, (ab-initio) many-body and time-dependent approaches were presented. A particular advance is the practical solution of the Faddeev/AGS equations for few-body dynamical systems in the presence of Coulomb and complex effective interactions, that is permitting assessments of the accuracy of other approximate dynamical theories of break-up and transfer reactions. The enormous efficiency gains resulting from the implementation of the J-scheme within the coupled-cluster approach is also allowing calculations of ground states of medium mass nuclei, to confront experiment. New GSI and NSCL measurements that link strongly with several of the theoretical activities under discussion were presented and stimulated much interest. These included data for nucleon knockout reactions that reveal intriguing differences in residue yields when using a nuclear and a nucleon target. The participation of young European-trained scientists (presently working overseas), Drs J Rotureau, G Hagen (ORNL), Quaglione (LLNL) and Rios Huguet (NSCL) strengthened emerging and fostered new collaborative opportunities.

 

The workshop was of immense value in both disseminating recent theoretical advances and in setting out clearly the theoretical foundations of the methodologies used. A number of ongoing collaborations were enlivened and new ones stimulated, by new results, data and theory capabilities. These included, at the time of the workshop, Sevilla-Surrey, Lisboa-Surrey-GSI, ORNL-Trento, GANIL-ORNL, Sevilla-Surrey-NSCL, Brussels-Surrey, Bergen-ORNL, and Lisboa-Sevilla-Surrey joint activities. Fonseca, Ploszajczak, Gomez-Camacho and Tostevin were able to coordinate final input and manpower priorities toward the FP7 ENSAR proposal and discuss future network activity with the ECT*.

 

3. Presentations

Presentations from the 24 discussion leaders (minus the associated and extensive discussion) and the full Workshop details are available on the TNET website. All presentations can be browsed at

http://www.nucleartheory.net/tnet/presentations.htm

Given the open nature of the workshop, including the sharing of many new (and yet unpublished) results, these presentations have in some cases been edited by the authors prior to being posted on the TNET website.

The Scientific Report of the Workshop delivered to ECT* can be found here.

(updated 24 January 2008)

 


Webmaster: J.A. Tostevin, University of Surrey.                       Queries to j.tostevin@surrey.ac.uk