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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 8 - 19
(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
Institute of Theoretical Physics II
Ruhr Universitaet Bochum

July 13 - July 19
Institute of Nuclear Physics
Technische Universitaet Darmstadt


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

Bochum:
Prof. Evgeny Epelbaum and Dr. Hermann Krebs and others for continuing
collaboration (LENPIC collaboration)

Darmstadt:
Prof. Robert Roth and his students (Sven Binder, Angelo Calci, Joachim
Langhammer) and Dr. Kai Hebeler for continuing collaboration


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6) TOPICS DISCUSSED DURING VISIT

Bochum:
development of the next-generation of NN and 3N interactions from
chiral effective field theory, and applications of these interactions
in many-body calculations of light nuclei

Darmstadt:
many-body calculations with interactions from chiral effective field
theory, both for light nuclei and for neutrons confined in a trap.

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7) IMPACT ON TRAVELER'S OR HOST'S RESEARCH (INCL. EXPECTED PUBLICATIONS)

We have finalized papers / revisions to papers, which have now been
published:

P. Maris, J.P. Vary, A. Calci, J. Langhammer, S. Binder, and R. Roth, 
12C properties with evolved chiral three-nucleon interactions,
arXiv:1405.1331 [nucl-th], Phys. Rev. C90, 014314 (2014)

H.D. Potter, S. Fischer, P. Maris, J.P. Vary, S. Binder, A. Calci, 
J. Langhammer, and R. Roth, 
Ab initio neutron drops with chiral Hamiltonians, 
arXiv:1406.1160 [nucl-th], Phys. Lett. B

J. Golak, R. Skibinski, K. Topolnicki, H. Witala, E. Epelbaum, H. Krebs, 
H. Kamada, U.G. Meissner, V. Bernard, P. Maris, J. Vary, S. Binder,
A. Calci, K. Hebeler, J. Langhammer, R. Roth, S. Liebig, and D. Minossi,
Low-energy neutron-deuteron reactions with N3LO chiral forces,
arXiv:1410.0756 [nucl-th], Eur. Phys. J. A (2014) 50:177


Additional papers on light nuclei (in particular A = 10, 13, and 14)
and a follow-up paper on neutron drop calculations are in preparation
with the Darmstadt group.

On the next-generation chiral interactions we also have additional
papers in preparation with the LENPIC collaboration.  

We have also made plans on using the next-generation chiral
interactions in calculations of light nuclei.

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

My work focuses on ab initio nuclear structure calculations with
interactions from chiral effective field theory.  Our goal is to
produce high-quality predictions for spectra and electroweak, which
will likely be relevant for current and future experiments at JLab and
GSI-Fair.

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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)

Accomodation in Bochum.
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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