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Welcome to ASTRUm

Experimental Nuclear Astrophysics Group @University of Cologne & @GSI

Research Group at GSI Helmholtz Centre for Heavy Ion Research and the University of Cologne

‘The Experimental Nuclear Astrophysics Group at GSI and the University of Cologne is a research group that investigates the origins of elements through storage ring experiments.’

Our Team

Group Leader

  • Prof. Dr. Yury A. Litvinov - Principal Investigator

Researchers

  • Dr. David Freire-Fernández - Project: Schottky + Isochronous Mass Spectrometry (S+IMS)
  • Dr. Jan Glorius - Project:
  • Dr. Dmytro Dmytriev - Project:

PhD Students

  • Carlo Forconi - Project:
  • Zac - Project:

Master & Bachelor Students

  • [Name] - Data analysis of

Software & Tools

RionID
RionID
Group Project Active

Collection of code for the identification of ringed ions in Python.

academic python data-analysis
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TDMchopS
TDMchopS
Group Project Active

Code that chops NTCAP data into time chunks for high-precision analysis of Schottky signals.

academic python data-analysis
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RionMass
RionMass
Group Project

Toolkit for mass measurements of ringed ions implementing the CMM with polynomial fit and splines.

academic python mass-measurement
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Publications

Measurement of the Isolated Nuclear Two-Photon Decay in 72Ge
Physical Review Letters 133, 022502 2024
D. FREIRE-FERNÁNDEZ et al.

two-photon decay Germanium experiment
Details
First Proton-Induced Cross Sections on a Stored Rare Ion Beam: Measurement of 118Te(p,γ) for Explosive Nucleosynthesis
Under review in Physical Review Letters 2024
S. DELLMANN et al.

proton-induced explosive nucleosynthesis rare ion beam
Laser spectroscopy of accelerator-produced hydrogen-like 208Bi82+ – a test of strong-field QED with 10^5 ions
Accepted in Nature Physics 2024
M. HORST et al.

laser spectroscopy hydrogen-like ions QED
First simultaneous measurement of the gamma-ray and neutron emission probabilities in inverse kinematics at a heavy-ion storage ring
Accepted in Physical Review C 2024
M. SGUAZZIN et al.

gamma-ray neutron emission inverse kinematics storage ring
Details
First electron conversion factor measurements at storage rings
Manuscript in preparation 2024
D. FREIRE-FERNÁNDEZ et al.

electron conversion storage ring First Author
Bρ-cutted combined Schottky plus Isochronous Mass Spectrometry (S+IMS)
Manuscript in preparation 2024
D. FREIRE-FERNÁNDEZ et al.

Schottky Isochronous S+IMS First Author
The first in-beam reaction measurement at CRYRING@ESR using the CARME array
European Physical Journal A 60, 95 2024
J. MARSH et al.

in-beam reaction CRYRING CARME array
Details
TDMchopS: A toolkit for automatic chopping of continuously acquired complex valued radio frequency samples
Zenodo 2023
D. FREIRE-FERNÁNDEZ

radio frequency toolkit TDMchopS Python First Author
Details
RionID: Collection of code for the identification of ringed ions in Python
Zenodo 2023
D. FREIRE-FERNÁNDEZ G. HUDSON-CHANG

ringed ions Python RionID First Author
Details
First measurement of the neutron-emission probability with a surrogate reaction in inverse kinematics at a heavy-ion storage ring
Accepted in Physical Review Letters 2023
M. SGUAZZIN et al.

neutron-emission surrogate reaction inverse kinematics storage ring
Details
Indirect measurements of neutron-induced reaction crosssections at heavy-ion storage rings
EPJ Web of Conferences 279, 11006 2023
M. SGUAZZIN et al.

neutron-induced reactions storage ring
Details
Proton capture on stored radioactive Te ions
EPJ Web of Conferences 279, 11018 2023
S. F. DELLMANN et al.

proton capture radioactive ions storage ring
Details

Open Positions

PhD Positions
Available Contact

We are looking for motivated PhD candidates to work on experimental nuclear astrophysics at the GSI storage rings. Topics include reaction studies, mass and half-life spectrometry.

PhD Research
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Master & Bachelor Theses
Available Ongoing

We offer various topics for Master and Bachelor theses involving data analysis (Python/C++), detector development, and simulations.

Thesis Students
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Internships / Summer Students
Seasonal Summer 2026

Join us for a summer internship through the GSI Summer Student Program to gain hands-on experience in experimental nuclear physics.

Internship
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