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                              GAUSTEQ
           Germany and U.S. Nuclear Theory Exchange Program
                 for QCD Studies of Hadrons and Nuclei

*************************** VISITOR REPORT ***************************

Please use the following template to prepare your report in plain text 
format.  Short, itemized answers are preferred.

Send your report by E-mail to <gausteq@jlab.org> 
(as an attachment to preserve formating).

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1) NAME AND HOME INSTITUTION OF TRAVELER (INCL. E-MAIL ADDRESS)

Pieter Maris
Dept. of Physics
Iowa State University
Ames, IA 50010

pmaris@iastate.edu

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2) POSITION OF TRAVELER (FACULTY/STAFF/POSTDOC/STUDENT)

Research associate professor

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3) DATES OF TRAVEL

July 19 - August 1
(as part of a longer trip to Europe)

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4) INSTITUTIONS VISITED (LIST PLACES AND TIME SPENT THERE)

July 19 - July 31
Institut of Nuclear Physics
Technische Universitat Darmstadt

July 30
Theory Group
GSI Darmstadt

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5) SCIENTIFIC CONTACTS AND COLLABORATORS (INDICATE NATURE OF CONTACTS,
   LIKE "NEW COLLABORATION," "CONTINUING COLLABORATION,"
   "USEFUL DISCUSSION," ETC.)

Prof. Robert Roth and his students (Darmstadt), new collaboration
Prof. Achim Schwenk and Dr. Javier Menendez (Darmstadt), new collaboration
Dr. Thomas Neff (GSI), useful discussions

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6) TOPICS DISCUSSED DURING VISIT

Incorporation of chiral 3-body forces in ab initio 
many-body nuclear structure calculations; 
Improved chiral 3-body forces 
(which are expected to become available soon);
Electroweak matrix elements, both leading order 
and corrections coming from effective chiral field theory;
Clustering in light nuclei, two-body observables 
and two-body density matrix elements.
 
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7) IMPACT ON TRAVELER'S OR HOST'S RESEARCH (INCL. EXPECTED PUBLICATIONS)

We expect to have ongoing collaborations with Prof. Robert Roth 
and his group on ab initio nuclear structure calculations, leading 
to several joint publications (a first joint publication is in
preparation).  We plan to jointly develop critical theoretical
ingredients such as input 3-body forces for many-body nuclear
structure calculations and output many-body wavefunctions.  
We also plan to jointly compete for the needed computer resources 
in future proposals to DOE.

With Prof. Achim Schwenk and Dr. Javier Menendez (as well as
Prof. Doron Gazit from The Hebrew University of Jerusalem) we plan 
to evaluate chiral two-body current corrections for electroweak
processes that are obtained within the ab initio nuclear structure
calculations.  This project will necessarily involve setting up a
large scale collaboration involving Prof. Doran Gazit and a team of 
ab initio researchers committed to evaluating and storing two-body
density matrices.

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8) RELEVANCE TO JEFFERSON LAB OR GSI-FAIR (LIST RELEVANT PROGRAMS)

Nucleon-nucleon and three-nucleon correlations are hot-topic areas
under investigation for planned experiments at the 12 GeV JLab
facility.  My work focuses on ab initio nuclear structure with
interactions from chiral effective field theory.  One goal is to
produce high-quality predictions for these future experiments at JLab.

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9) SUGGESTIONS/RECOMMENDATIONS FOR PROGRAM ADMINISTRATORS (IF ANY)

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10) SUPPORT PROVIDED BY HOSTS (INDICATE TYPE AND EXTENT OF SUPPORT,
    NOT EXACT AMOUNTS)

Office space.

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11) ACKNOWLEDGMENTS

Please acknowledge support from the GAUSTEQ program in any publication
benefiting from the results of your visit, by including the following
text in your acknowledgments:

"This work was supported partially through GAUSTEQ (Germany and U.S. 
Nuclear Theory Exchange Program for QCD Studies of Hadrons and Nuclei) 
under contract number DE-SC0006758." 

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