Siegbert Hagmann

GSI Helmholtz Centre for Heavy Ion Research

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GSI Helmholtz Centre for Heavy Ion Research

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Siegbert Hagmann has a total of 350 co-authors. Here are the top co-authors by number of shared publications:

Uwe Spillmann
GSI Helmholtzzentrum für Schwerionenforschung GmbH
23 shared publications
Christophor Kozhuharov
GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, D-64291 Darmstadt, Germany
16 shared publications
Pierre-Michel Hillenbrand
Justus-Liebig-Universität Giessen
16 shared publications
Dariusz Banas
Institute of Physics Jan Kochanowski University Kielce Poland
12 shared publications
Michael Lestinsky
GSI Helmholtzzentrum für Schwerionenforschung GmbH
12 shared publications
Yuri A. Litvinov
GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, D-64291 Darmstadt, Germany
12 shared publications

Latest Publications

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Cited by 12
- 9 April 2025
- Published by American Physical Society (APS) in Physical Review Letters
First Proton-Induced Cross Sections on a Stored Rare Ion Beam: Measurement of ${}^{118}{Te} (p, γ)$ for Explosive Nucleosynthesis
by S. F. Dellmann, J. Glorius, Yu. A. Litvinov, R. Reifarth, L. Varga, M. Aliotta, F. Amjad, K. Blaum, L. Bott, C. Brandau, et al.
We present the first nuclear cross-section measurements of ( p , γ ) and (p,n) reactions on Te 118 at energies relevant for the γ -process nucleosynthesis. Absolute cross-section values for center-of-mass energies of 6, 7 and 10 MeV are provided, together with a theoretical extrapolation to the Gamow window. This experiment marks the first time that direct proton-induced reactions have been measured on a radioactive ion beam at the Experimental Storage Ring (ESR) at GSI, Darmstadt. This paves the way for a large variety of measurements, delivering new constraints for explosive nucleosynthesis and for physics beyond nuclear stability.
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- 9 April 2025
- Published by American Physical Society (APS) in Physical Review Letters
Open Access
First Proton-Induced Cross Sections on a Stored Rare Ion Beam: Measurement of ${}^{118}{Te} (p, γ)$ for Explosive Nucleosynthesis
by S. F. Dellmann, J. Glorius, Yu. A. Litvinov, R. Reifarth, L. Varga, M. Aliotta, F. Amjad, K. Blaum, L. Bott, C. Brandau, et al.
We present the first nuclear cross-section measurements of ( p , γ ) and (p,n) reactions on Te 118 at energies relevant for the γ -process nucleosynthesis. Absolute cross-section values for center-of-mass energies of 6, 7 and 10 MeV are provided, together with a theoretical extrapolation to the Gamow window. This experiment marks the first time that direct proton-induced reactions have been measured on a radioactive ion beam at the Experimental Storage Ring (ESR) at GSI, Darmstadt. This paves the way for a large variety of measurements, delivering new constraints for explosive nucleosynthesis and for physics beyond nuclear stability.
Cited by 12
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Cited by 7
- 11 February 2022
- Published by American Physical Society (APS) in Physical Review A
Single and double $K$ -shell vacancy production in slow ${Xe}^{54 +, 53 +}$ -Xe collisions
by P.-M. Hillenbrand, S. Hagmann, Y. S. Kozhedub, E. P. Benis, C. Brandau, R. J. Chen, D. Dmytriiev, O. Forstner, J. Glorius, R. E. Grisenti, et al.
We present an experimental and theoretical study of symmetric ${Xe}^{54 +} + Xe$ collisions at 50, 30, and 15 MeV/u, corresponding to strong perturbations with $v_{K} / v_{p} = 1.20$ , 1.55, and 2.20, respectively ( $v_{K}$ is the classical $K$ -shell orbital velocity and $v_{p}$ is the projectile velocity), as well as ${Xe}^{53 +} + Xe$ collisions at 15 MeV/u. For each of these systems, x-ray spectra are measured under a forward angle of $35^{\circ}$ with respect to the projectile beam. Target satellite and hypersatellite radiation $K α_{2, 1}^{s}$ and $K α_{2, 1}^{hs}$ , respectively, are analyzed and used to derive cross-section ratios for double-to-single target $K$ -shell vacancy production. We compare our experimental results to relativistic time-dependent two-center calculations.
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- 11 February 2022
- Published by American Physical Society (APS) in Physical Review A
Single and double $K$ -shell vacancy production in slow ${Xe}^{54 +, 53 +}$ -Xe collisions
by P.-M. Hillenbrand, S. Hagmann, Y. S. Kozhedub, E. P. Benis, C. Brandau, R. J. Chen, D. Dmytriiev, O. Forstner, J. Glorius, R. E. Grisenti, et al.
We present an experimental and theoretical study of symmetric ${Xe}^{54 +} + Xe$ collisions at 50, 30, and 15 MeV/u, corresponding to strong perturbations with $v_{K} / v_{p} = 1.20$ , 1.55, and 2.20, respectively ( $v_{K}$ is the classical $K$ -shell orbital velocity and $v_{p}$ is the projectile velocity), as well as ${Xe}^{53 +} + Xe$ collisions at 15 MeV/u. For each of these systems, x-ray spectra are measured under a forward angle of $35^{\circ}$ with respect to the projectile beam. Target satellite and hypersatellite radiation $K α_{2, 1}^{s}$ and $K α_{2, 1}^{hs}$ , respectively, are analyzed and used to derive cross-section ratios for double-to-single target $K$ -shell vacancy production. We compare our experimental results to relativistic time-dependent two-center calculations.
Cited by 7
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Cited by 5
- 19 July 2021
- Published by American Physical Society (APS) in Physical Review A
Electron-loss-to-continuum cusp in collisions of $U^{89 +}$ with $N_{2}$ and Xe
by P.-M. Hillenbrand, K. N. Lyashchenko, S. Hagmann, O. Yu. Andreev, D. Banaś, E. P. Benis, A. I. Bondarev, C. Brandau, E. De Filippo, O. Forstner, et al.
We study the electron-loss-to-continuum (ELC) cusp experimentally and theoretically by comparing the ionization of $U^{89 +}$ projectiles in collisions with $N_{2}$ and Xe targets, at a beam energy of 75.91 MeV/u. The coincidence measurement between the singly ionized projectile and the energy of the emitted electron is used to compare the shape of the ELC cusp at weak and strong perturbations. A significant energy shift for the centroid of the electron cusp is observed for the heavy target of Xe as compared to the light target of $N_{2}$ . Our results provide a stringent test for fully relativistic calculations of double-differential cross sections performed in the first-order approximation and in the continuum-distorted-wave approach.
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- 19 July 2021
- Published by American Physical Society (APS) in Physical Review A
Electron-loss-to-continuum cusp in collisions of $U^{89 +}$ with $N_{2}$ and Xe
by P.-M. Hillenbrand, K. N. Lyashchenko, S. Hagmann, O. Yu. Andreev, D. Banaś, E. P. Benis, A. I. Bondarev, C. Brandau, E. De Filippo, O. Forstner, et al.
We study the electron-loss-to-continuum (ELC) cusp experimentally and theoretically by comparing the ionization of $U^{89 +}$ projectiles in collisions with $N_{2}$ and Xe targets, at a beam energy of 75.91 MeV/u. The coincidence measurement between the singly ionized projectile and the energy of the emitted electron is used to compare the shape of the ELC cusp at weak and strong perturbations. A significant energy shift for the centroid of the electron cusp is observed for the heavy target of Xe as compared to the light target of $N_{2}$ . Our results provide a stringent test for fully relativistic calculations of double-differential cross sections performed in the first-order approximation and in the continuum-distorted-wave approach.
Cited by 5
Open Access
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Cited by 5
- 25 March 2021
- Published by MDPI AG in Atoms
Angular Distribution of Characteristic Radiation Following the Excitation of He-Like Uranium in Relativistic Collisions
by Alexandre Gumberidze, Daniel B. Thorn, Andrey Surzhykov, Christopher J. Fontes, Dariusz Banaś, Heinrich F. Beyer, Weidong Chen, Robert E. Grisenti, Siegbert Hagmann, Regina Hess, et al.
In this paper, we present an experimental and theoretical study of excitation processes for the heaviest stable helium-like ion, that is, He-like uranium occurring in relativistic collisions with hydrogen and argon targets. In particular, we concentrate on angular distributions of the characteristic K $α$ radiation following the K → L excitation of He-like uranium. We pay special attention to the magnetic sub-level population of the excited $1 s 2 l_{j}$ states, which is directly related to the angular distribution of the characteristic K $α$ radiation. We show that the experimental data can be well described by calculations taking into account the excitation by the target nucleus as well as by the target electrons. Moreover, we demonstrate for the first time an important influence of the electron-impact excitation process on the angular distributions of the K $α$ radiation produced by excitation of He-like uranium in collisions with different targets.
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- 25 March 2021
- Published by MDPI AG in Atoms
Open Access
Angular Distribution of Characteristic Radiation Following the Excitation of He-Like Uranium in Relativistic Collisions
by Alexandre Gumberidze, Daniel B. Thorn, Andrey Surzhykov, Christopher J. Fontes, Dariusz Banaś, Heinrich F. Beyer, Weidong Chen, Robert E. Grisenti, Siegbert Hagmann, Regina Hess, et al.
In this paper, we present an experimental and theoretical study of excitation processes for the heaviest stable helium-like ion, that is, He-like uranium occurring in relativistic collisions with hydrogen and argon targets. In particular, we concentrate on angular distributions of the characteristic K $α$ radiation following the K → L excitation of He-like uranium. We pay special attention to the magnetic sub-level population of the excited $1 s 2 l_{j}$ states, which is directly related to the angular distribution of the characteristic K $α$ radiation. We show that the experimental data can be well described by calculations taking into account the excitation by the target nucleus as well as by the target electrons. Moreover, we demonstrate for the first time an important influence of the electron-impact excitation process on the angular distributions of the K $α$ radiation produced by excitation of He-like uranium in collisions with different targets.
Cited by 5
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Cited by 2
- 22 October 2019
- Published by Wiley in X-Ray Spectrometry
High‐resolution wavelength‐dispersive spectroscopy of K‐shell transitions in hydrogen‐like gold
by T. Gassner, A. Gumberidze, M. Trassinelli, R. Heß, U. Spillmann, D. Banaś, K.‐H. Blumenhagen, F. Bosch, C. Brandau, W. Chen, et al.
We present a measurement of K‐shell transitions in H‐like gold (Au ⁷⁸⁺ ) using specially developed transmission type crystal spectrometers combined with Ge(i) microstrip detectors. The experiment has been carried out at the Experimental Storage Ring at GSI in Darmstadt. This is a first high‐resolution wavelength‐dispersive measurement of a K‐shell transition in a high‐Z H‐like ion, thus representing an important milestone in this field. Ideas on possible future improvements are discussed as well.
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- 22 October 2019
- Published by Wiley in X-Ray Spectrometry
High‐resolution wavelength‐dispersive spectroscopy of K‐shell transitions in hydrogen‐like gold
by T. Gassner, A. Gumberidze, M. Trassinelli, R. Heß, U. Spillmann, D. Banaś, K.‐H. Blumenhagen, F. Bosch, C. Brandau, W. Chen, et al.
We present a measurement of K‐shell transitions in H‐like gold (Au ⁷⁸⁺ ) using specially developed transmission type crystal spectrometers combined with Ge(i) microstrip detectors. The experiment has been carried out at the Experimental Storage Ring at GSI in Darmstadt. This is a first high‐resolution wavelength‐dispersive measurement of a K‐shell transition in a high‐Z H‐like ion, thus representing an important milestone in this field. Ideas on possible future improvements are discussed as well.
Cited by 2
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- 17 July 2019
- Published by Wiley in X-Ray Spectrometry
A magnetic spectrometer for electron‐positron pair spectroscopy in storage rings
by Siegbert Hagmann, Pierre‐Michel Hillenbrand, Yuri A. Litvinov, Uwe Spillmann, Thomas Stöhlker
We report an analysis of electron‐optical properties of a toroidal magnetic sector spectrometer and examine parameters for its implementation in a relativistic heavy‐ion storage ring, for example the High Energy Storage ring (HESR) at the future Facility for Antiproton and Ion Research (FAIR) facility. For studies of free–free pair production in heavy‐ion atom collisions, this spectrometer exhibits very high efficiencies for coincident e ⁺ –e ⁻ pair spectroscopy over a wide range of momenta of emitted lepton pairs. The high coincidence efficiency of the spectrometer is the key for stringent tests of theoretical predictions for the phase space correlation of lepton vector momenta in free–free pair production.
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- 17 July 2019
- Published by Wiley in X-Ray Spectrometry
A magnetic spectrometer for electron‐positron pair spectroscopy in storage rings
by Siegbert Hagmann, Pierre‐Michel Hillenbrand, Yuri A. Litvinov, Uwe Spillmann, Thomas Stöhlker
We report an analysis of electron‐optical properties of a toroidal magnetic sector spectrometer and examine parameters for its implementation in a relativistic heavy‐ion storage ring, for example the High Energy Storage ring (HESR) at the future Facility for Antiproton and Ion Research (FAIR) facility. For studies of free–free pair production in heavy‐ion atom collisions, this spectrometer exhibits very high efficiencies for coincident e ⁺ –e ⁻ pair spectroscopy over a wide range of momenta of emitted lepton pairs. The high coincidence efficiency of the spectrometer is the key for stringent tests of theoretical predictions for the phase space correlation of lepton vector momenta in free–free pair production.
Open Access
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- 3 May 2019
- Published by arXiv in arXiv
A Magnetic Spectrometer for Electron-Positron Pair Spectroscopy in Storage Rings
by S. Hagmann, P. M. Hillenbrand, Yu. A. Litvinov, U. Spillmann, Th. Stöhlker
We report an analysis of electron-optical properties of a toroidal magnetic sector spectrometer and examine parameters for its implementation in a relativistic heavy-ion storage ring like HESR at the future FAIR facility. For studies of free-free pair production in heavy-ion atom collisions, this spectrometer exhibits very high efficiencies for coincident $e^+e^-$ pair spectroscopy over a wide range of momenta of emitted lepton pairs. The high coincidence efficiency of the spectrometer is the key for stringent tests of theoretical predictions for the phase space correlation of lepton vector momenta in free-free pair production.
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- 3 May 2019
- Published by arXiv in arXiv
Open Access
A Magnetic Spectrometer for Electron-Positron Pair Spectroscopy in Storage Rings
by S. Hagmann, P. M. Hillenbrand, Yu. A. Litvinov, U. Spillmann, Th. Stöhlker
We report an analysis of electron-optical properties of a toroidal magnetic sector spectrometer and examine parameters for its implementation in a relativistic heavy-ion storage ring like HESR at the future FAIR facility. For studies of free-free pair production in heavy-ion atom collisions, this spectrometer exhibits very high efficiencies for coincident $e^+e^-$ pair spectroscopy over a wide range of momenta of emitted lepton pairs. The high coincidence efficiency of the spectrometer is the key for stringent tests of theoretical predictions for the phase space correlation of lepton vector momenta in free-free pair production.
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Cited by 6
- 1 October 2017
- Published by Elsevier in Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Impact parameter sensitive study of inner-shell atomic processes in the experimental storage ring
by A. Gumberidze, Christophor Kozhuharov, R.T. Zhang, S. Trotsenko, Y.S. Kozhedub, R.D. DuBois, H.F. Beyer, K.-H. Blumenhagen, C. Brandau, A. Bräuning-Demian, et al.
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- 1 October 2017
- Published by Elsevier in Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Impact parameter sensitive study of inner-shell atomic processes in the experimental storage ring
by A. Gumberidze, Christophor Kozhuharov, R.T. Zhang, S. Trotsenko, Y.S. Kozhedub, R.D. DuBois, H.F. Beyer, K.-H. Blumenhagen, C. Brandau, A. Bräuning-Demian, et al.
Cited by 6
Open Access
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- 7 September 2015
- Published by IOP Publishing in Journal of Physics: Conference Series
Relativistic effects in electron-capture to the continuum in 90 MeV/u U88++N2collisions
by J M Monti, P-M Hillenbrand, S Hagmann, R D Rivarola
The Continuum Distorted Wave (CDW) model is used to describe electron-capture to continuum cusp in 90 MeV/u U⁸⁸⁺ + N₂ collisions. Relativistic effects are studied considering Lorentz transformations on the electron kinematics.
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- 7 September 2015
- Published by IOP Publishing in Journal of Physics: Conference Series
Open Access
Relativistic effects in electron-capture to the continuum in 90 MeV/u U88++N2collisions
by J M Monti, P-M Hillenbrand, S Hagmann, R D Rivarola
The Continuum Distorted Wave (CDW) model is used to describe electron-capture to continuum cusp in 90 MeV/u U⁸⁸⁺ + N₂ collisions. Relativistic effects are studied considering Lorentz transformations on the electron kinematics.
Open Access
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Cited by 1
- 7 September 2015
- Published by IOP Publishing in Journal of Physics: Conference Series
Electron emission spectra of U28+-ions colliding with gaseous targets
by P-M Hillenbrand, S Hagmann, J M Monti, R D Rivarola, K-H Blumenhagen, C Brandau, W Chen, R D DuBois, A Gumberidze, D L Guo, et al.
The electron-loss to continuum has been studied experimentally and theoretically for the collision systems U²⁸⁺ + H₂ at a collision energy of 50 MeV/u, U²⁸⁺ + N₂ at 30 MeV/u, and U²⁸⁺ + Xe at 50 MeV/u.
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- 7 September 2015
- Published by IOP Publishing in Journal of Physics: Conference Series
Open Access
Electron emission spectra of U28+-ions colliding with gaseous targets
by P-M Hillenbrand, S Hagmann, J M Monti, R D Rivarola, K-H Blumenhagen, C Brandau, W Chen, R D DuBois, A Gumberidze, D L Guo, et al.
The electron-loss to continuum has been studied experimentally and theoretically for the collision systems U²⁸⁺ + H₂ at a collision energy of 50 MeV/u, U²⁸⁺ + N₂ at 30 MeV/u, and U²⁸⁺ + Xe at 50 MeV/u.
Cited by 1

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