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Stored and Cooled Ions Division
Max Planck SocietyMax Planck Institute for Nuclear PhysicsUniversity of Heidelberg Stored and Cooled Ions Division
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Tel.: +49 6221 516-851
Fax: +49 6221 516-852
Postal Address
Max Planck Institute for Nuclear Physics
P.O. Box 10 39 80
69029 Heidelberg
Visitor Address
Max Planck Institute for Nuclear Physics
Saupfercheckweg 1
Building: Gentner lab,
room 134
69117 Heidelberg



Unexpected evolution of nuclear sizes in Ca isotopes away from stability challenges nuclear theory
In atomic nuclei the nucleons (protons and neutrons) occupy quantum levels that are separated by energy gaps leading to a simple shell structure similar to the well-known electron shells in the atom. ... >

Simple nuclear structure in 111–129Cd revealed by high-resolution laser spectroscopy
In most cases nuclear states are complex and thus their theoretical description has to reduce this complexity to a set of basic concepts like shell structure, pairing, "magic" numbers, and deformation. However, in near-closed-shell nuclei, simple structures may occur as a result of the spherical symmetry breaking up. ... >


Physik am Samstagmorgen
Sat., Feb 20, 2016, 09:30, Otto Hahn lecture hall
Speaker: Klaus Blaum ... >
36th Heidelberg Physics Graduate Days
April 11-15, 2016, Heidelberg University ... >


Ring Lecture AMO Physics in Heidelberg
Fri., 22. Apr 2016, 14:15, INF 227 / SR 2.402 ... >
Advanced seminar "Stored and Cooled Ions"
fortnightly, on Wednesdays, 15:00, Seminar Room Blaum ... >


Welcome to the homepage of the Stored and Cooled Ions Division
Director: Prof. Dr. Klaus Blaum

  • A Penning trap for precision mass measurements
  • An ion with only one electron stored in a cylindrical Penning trap
  • 7 T superconducting magnet for PENTATRAP
  • A liquid-nitrogen-cooled GaAs photocathode producing electron beams with internal temperatures down to 10 K
  • View onto the CSR in November 2013
  • Profile of the first beam of argon ions in the not yet cooled CSR on March 17, 2014
  • The cryogenic ion trap used as a prototype for the CSR

The experimental working group of the division is concerned with precision experiments on stored and cooled ions as well as with the investigation of fundamental processes of molecular ions. For this purpose short-lived radionuclides, highly-charged ions or simple molecular ions are trapped in Penning traps and storage rings under conditions as they also occur in space. Another main research field of the division is the development of novel storage, cooling and detection techniques for future experiments.