Institut de recherche sur les lois fondamentales de l'Univers

 

Christophe THEISEN +33 (1) 69 08 74 54 +33 (1) 69 08 75 84 christophe.theisencea.fr

 

Physicist at DPhN

Researcher ID : A-9343-2015

Research topics

Nuclear structure studies, mainly heavy and superheavy elements, related instrumentation and analysis techniques. Experiments mainly performed at the University of Jyväskylä (Finland) and at GANIL.

Recent and present collaborations:

• MUSETT, a highly segmented Si Wall for the VAMOS spectrometer/separator
• S3, the new Super Separator Spectrometer for the high-intensity stable beams of SPIRAL2.
• AGATA, the European Gamma Tracking array.
• VAMOS-GFS, a project for upgrading the VAMOS spectrometer as a zero degree Gas-Filled Separator, to be used with AGATA, EXOGAM2, …

CV

• 1989 : Licence (L3) Physics, Strasbourg.
• 1991: Physics engineer ENSPS Strasbourg.
• 1991 : DEA (M2) nuclear physics, Strasbourg.
• 1991 – 1995 : PhD Thesis and teaching at Strasbourg.
• Since 1995 : Physicist at CEA
• Since 2009 : CEA “Expert Senior”
• 2009 : HDR Habilitation, Orsay Paris-Sud
• Since 2018 : Deputy director of DPhN

Collaborations, working groups

• SAPhIR (Saclay Acquitaine photovoltaic cells for isomer research)
• EUROBALL :
  • Ancillary detectors group: 1996 - 2002.
  • Electronics and acquisition group: 1996 - 2000.
• EXOGAM :
  • EXOGAM ancillary detector group : 1997 -
  • EXOGAM data and acquisition: 1997 - 2002.
  • EXOGAM (2) Steering committee: 2011 -
• EXOTAG (FP5) « Studies of exotic nuclei using tagging spectrometers »  2000 – 2005.
• AGATA :
  •  « Team leader » Electronics and DAQ integration of ancillary detector: 2003 - 2007.
  • « Group leader » AGATA DAQ : 2007 –2011.
  • AMB  « AGATA Management Board » : 2007 –2011. 
  • Scientific coordinator for IRFU : 2015-2018
  • ASC « AGATA Steering Committe »
• BEST (Box for Electron Spectroscopy after Tagging) coordinator (array for FULIS/GANIL experiment, 2003).
• HENS collaboration « Heavy Elements Nuclear Structure » : 2004 - 2007.
• JRA INTAG «Instrumentation for Tagging », steering committee, EURONS FP6 : 2005 - 2008.
• GammaPool network « Coordination of the resources for gamma-ray spectroscopy in Europe » –EURONS FP6 : 2005 – 2008.
• SHE network « Transfermium element synthesis, properties and reactions » –EURONS FP6: 2005 – 2008.
• MUSETT (Si Wall for the Study of Transfermium elements using Tagging, ANR project) scientific coordinator: 2005 -
• Spiral2 : co-spokesperson of Letters of Intent (S3) : 2006 -
• S3 Super Separator Spectrometer : Detection system : 2006 -
• VAMOS-GFS (VAMOS Gas-Filled Separator) scientific coordinator : 2015 -

Committees and other responsibilities

• PAC (Program Advisory committee) Vivitron : 2001-2003
• GANIL User Board : 2003-2008
• SPhN CSTS (Scientific and technical Council): 2006 – 2009.
• PAC (Program Advisory committee)  GANIL : 2007 – 2010
• CENBG Scientific Council : 2007 – 2011
• P2IO Labex doc & post-doc selection committee : 2012 - 2018
• IRFU-IN2P3 semiconductors detectors networks : 2012 - 2017
• GANIL 2025 think tank : 2014 - 2016
• SNIF le de France nuclear physicists network : 2014 - 2018
• Joliot-Curie school of nuclear physics Scientific Committee : 2015 -
• P2I (Physics of the two Infinites) Department Council at Paris-Saclay University : 2016 - 2018
• SFP member
• Various expertise for STFC (UK), ANR (France), conferences organizing or advisory comities, journals referee, …
• Spokesperson of ~10 experiments at Strasbourg, Legnaro, GANIL, Jyväskylä

Publications, conferences

~ 120 publications in referee journals, ~ 100 conference proceedings, ~ 22 invited talk in conferences

Main publications :

• PhD Thesis “Excitations multiparticules dans le noyau superdéformé 149Gd - Signature d'une symétrie nouvelle C4 du noyau”, Strasbourg, 1995
• S. Flibotte, G. Hackman, Ch. Theisen et al., “Multi-particle excitations and identical bands in the superdeformed  ¹⁴⁹Gd nucleus”, Phys. Rev. Lett. 71 (1993) 688.
• S. Flibotte, G. Hackmann, I. Ragnarsson, Ch. Theisen et al., “Multi-particle excitations in the superdeformed ¹⁴⁹Gd nucleus”, Nucl. Phys. A584 (1995) 373.
• Ch. Theisen, N. Khadiri, J.P. Vivien et al., “Favored Neutron Excitations in Superdeformed ¹⁴⁷Gd”, Phys. Rev. C 54 (1996) 2910.
• M. Houry, R. Lucas, M.G. Porquet, Ch. Theisen et al.,  “Structure of neutron rich palladium isotopes produced in heavy ion induced fission”, Eur. Phys. J. A 6 (1999) 43.
• Ch. Theisen et al., “Improvement of high-fold gamma-ray data processing : the spherical gate method”, Nucl. Instrum.  Methods Phys. Res., Sect. A432 (1999) 249.
• Ch. Theisen “Des noyaux lourds aux noyaux super-lourd”. Lecture given at the Joliot-Curie school, 2002.
• A. Chatillon, Ch. Theisen, P.T. Greenlees et al., “Spectroscopy and single-particle structure of the odd-Z heavy elements ²⁵⁵Lr, ²⁵¹Md and ²⁴⁷Es.”, Eur. Phys. J. A 30 (2006) 397.
• A. Chatillon, Ch. Theisen et al., “Observation of a Rotational Band in the Odd-Z Transfermium Nucleus  ²⁵¹Md”, Phys. Rev. Lett. 98 (2007) 132503.
• Ch. Theisen, A. Lopez-Martens, Ch. Bonnelle, “Internal conversion and summing effects in heavy-nuclei spectroscopy”, Nucl. Instrum.  Methods Phys. Res., Sect. A589 (2008) 230.
• HDR “Spectroscopie du noyau : déformations et masses extremes”, Université Paris-Sud, Orsay 2009.
• A. Astier, M.-G. Porquet, Ch. Theisen et al., “High-spin states with seniority v=4, 5, and 6 in ^119–126Sn”, Physical Review C 85 (2012) 054316.
• Contribution to “AGATA. Plongée dans les états extrêmes de la matière nucléaire”, La Recherche 467 (2012) 61.
• B. Sulignano, Ch. Theisen et al., “Investigation of high-K states in ²⁵²No”, Physical Review C 86 (2012) 044318.
• Ch. Theisen et al., “MUSETT: a segmented Si array for Recoil-Decay-Tagging studies at VAMOS”, Nucl. Instrum.  Methods Phys. Res., Sect. A 747 (2014) 69.
• Ch. Theisen, P.T. Greenlees, T.-L. Khoo, P. Chowdhury, T. Ishii, “In-beam spectroscopy of heavy elements”, Nucl. Phys. A 944 (2015) 333
• D. Ackermann, Ch. Theisen, Nuclear structure features of very heavy and superheavy nuclei - tracing quantum mechanics towards the “island of stability" Physica Scripta 92 (2017) 083002
• R. Briselet, Ch. Theisen, M. Vandebrouck, A. Marchix et al., “Production cross section and decay study of ²⁴³Es and ²⁴⁹Md”. Physical Review C 99 (2019)

More on google scholar and on ResercherID

 

Teaching

• Strasbourg University : 1991-1995
• 2002 : Ecole Joliot-Curie de physique nucléaire. « Des noyaux lourds aux superlourds »
• 2008 : 15^th Euroschool on Exotic Beams, Piaski (Pologne). « Spectroscopy of very heavy elements »
• 2017 : Ecole Joliot-Curie de physique nucléaire. « From the discovery of fission to the synthesis and decay of superheavy nuclei »
• 2019 : Ecole doctorale PHENIICS. « Superheavy Nuclei »