Ronald Schwengner

Helmholtz-Zentrum Dresden-Rossendorf

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Helmholtz-Zentrum Dresden-Rossendorf

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Nuclear Physics

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Ronald Schwengner has a total of 1000 co-authors. Here are the top co-authors by number of shared publications:

Andreas Wagner
Institute of Radiation Physics, Helmholtz-Zentrum Dresden – Rossendorf, Dresden 01328, Germany
98 shared publications
Arnd Rudolf Junghans
Helmholtz-Zentrum Dresden-Rossendorf
88 shared publications
R. Beyer
Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
42 shared publications
G. Rusev
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
37 shared publications
E. Grosse
Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiation Physics, D-01328 Dresden, Germany
36 shared publications
R. Massarczyk
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
34 shared publications

Latest Publications

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Cited by 1
- 19 December 2025
- Published by Elsevier in Geochimica et Cosmochimica Acta
First experimental determination of the 40Ar(n,2n)39Ar reaction cross section and 39Ar production in Earth’s atmosphere
by S. Bhattacharya, M. Paul, Sahoo, R. Purtschert, H.F.R. Hoffmann, M. Pichotta, K. Zuber, D. Bemmerer, T. Döring, R. Schwengner, et al.
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- 19 December 2025
- Published by Elsevier in Geochimica et Cosmochimica Acta
Open Access
First experimental determination of the 40Ar(n,2n)39Ar reaction cross section and 39Ar production in Earth’s atmosphere
by S. Bhattacharya, M. Paul, Sahoo, R. Purtschert, H.F.R. Hoffmann, M. Pichotta, K. Zuber, D. Bemmerer, T. Döring, R. Schwengner, et al.
Cited by 1
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- 23 July 2025
- Published by American Physical Society (APS) in Physical Review C
Evidence for neutron-induced $γ$ -ray emissions in the vicinity of the $Q$ value of ${}^{76}{Ge}$ $0 ν β β$ decay
by Marie Pichotta, Toralf Döring, Hans F. R. Hoffmann, Konrad Schmidt, Ronald Schwengner, Steffen Turkat, Birgit Zatschler, Kai Zuber
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- 23 July 2025
- Published by American Physical Society (APS) in Physical Review C
Evidence for neutron-induced $γ$ -ray emissions in the vicinity of the $Q$ value of ${}^{76}{Ge}$ $0 ν β β$ decay
by Marie Pichotta, Toralf Döring, Hans F. R. Hoffmann, Konrad Schmidt, Ronald Schwengner, Steffen Turkat, Birgit Zatschler, Kai Zuber
Open Access
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- 25 June 2025
- Published by EDP Sciences in EPJ Web of Conferences
Low-energy M1 modes in germanium isotopes
by Ronald Schwengner, Stefan Frauendorf
Magnetic dipole strength functions are determined for the series of germanium isotopes from N = 30 to 48 on the basis of a large number of transition strengths calculated within the shell model. The evolution of the strength with increasing neutron number in the 1g_9/2 orbital is analyzed. An enhancement toward low transition energy and a resonance in the region of the scissors mode are identified. The low-energy enhancement is strongest near closed shells, in particular at the almost completely filled 1g_9/2 orbital, while the scissorslike resonance is most pronounced in the middle of the open shell, which correlates with the magnitude of the also deduced electric quadrupole transition strengths. The results are consistent with previous findings for the shorter series of iron isotopes and prove the occurrence and correlation of the two low-lying magnetic dipole modes as a global structural feature.
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- 25 June 2025
- Published by EDP Sciences in EPJ Web of Conferences
Open Access
Low-energy M1 modes in germanium isotopes
by Ronald Schwengner, Stefan Frauendorf
Magnetic dipole strength functions are determined for the series of germanium isotopes from N = 30 to 48 on the basis of a large number of transition strengths calculated within the shell model. The evolution of the strength with increasing neutron number in the 1g_9/2 orbital is analyzed. An enhancement toward low transition energy and a resonance in the region of the scissors mode are identified. The low-energy enhancement is strongest near closed shells, in particular at the almost completely filled 1g_9/2 orbital, while the scissorslike resonance is most pronounced in the middle of the open shell, which correlates with the magnitude of the also deduced electric quadrupole transition strengths. The results are consistent with previous findings for the shorter series of iron isotopes and prove the occurrence and correlation of the two low-lying magnetic dipole modes as a global structural feature.
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Cited by 1
- 9 January 2025
- Published by American Physical Society (APS) in Physical Review C
Photoexcitation of ${}^{59}{Co}$
by R. Schwengner, R. Massarczyk, R. Beyer, N. Benouaret, A. Ferrari, A. Hartmann, T. Hensel, E. Masha, S. E. Müller, K. Römer, et al.
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- 9 January 2025
- Published by American Physical Society (APS) in Physical Review C
Photoexcitation of ${}^{59}{Co}$
by R. Schwengner, R. Massarczyk, R. Beyer, N. Benouaret, A. Ferrari, A. Hartmann, T. Hensel, E. Masha, S. E. Müller, K. Römer, et al.
Cited by 1
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Cited by 7
- 15 April 2024
- Published by American Physical Society (APS) in Physical Review C
Low-lying dipole response of ${}^{64}{Ni}$
by M. Müscher, E. Litvinova, R. Schwengner, T. Beck, D. Bemmerer, F. Fiedler, S. W. Finch, U. Friman-Gayer, S. Hammer, J. Isaak, et al.
Two complementary real-photon scattering experiments were conducted on the proton-magic ${}^{64}{Ni}$ nucleus to study the dipole response up to its neutron-separation energy of $S_{n} = 9.7 MeV$ . By combining both measurements, 87 $E 1$ and 23 $M 1$ transitions were identified above 4.3 MeV. The results of the observed $M 1$ transitions were compared to shell-model calculations using two different model spaces. It was found that the inclusion of excitations across the $Z = 28$ shell gap in the calculations has a large impact. Furthermore, average cross sections for decays to the ground state (elastic transitions) as well as to lower-lying excited states (inelastic decays) were determined. The corresponding $E 1$ channel was compared to calculations within the relativistic equation of motion (REOM) framework. Whereas the calculations of highest possible complexity reproduce the fragmentation and overall behavior of the $E 1$ average elastic cross section well, the predicted absolute cross sections are approximately twice as high as the experimental upper limits even though the latter also include an estimate of the inelastic-decay channel.
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- 15 April 2024
- Published by American Physical Society (APS) in Physical Review C
Low-lying dipole response of ${}^{64}{Ni}$
by M. Müscher, E. Litvinova, R. Schwengner, T. Beck, D. Bemmerer, F. Fiedler, S. W. Finch, U. Friman-Gayer, S. Hammer, J. Isaak, et al.
Two complementary real-photon scattering experiments were conducted on the proton-magic ${}^{64}{Ni}$ nucleus to study the dipole response up to its neutron-separation energy of $S_{n} = 9.7 MeV$ . By combining both measurements, 87 $E 1$ and 23 $M 1$ transitions were identified above 4.3 MeV. The results of the observed $M 1$ transitions were compared to shell-model calculations using two different model spaces. It was found that the inclusion of excitations across the $Z = 28$ shell gap in the calculations has a large impact. Furthermore, average cross sections for decays to the ground state (elastic transitions) as well as to lower-lying excited states (inelastic decays) were determined. The corresponding $E 1$ channel was compared to calculations within the relativistic equation of motion (REOM) framework. Whereas the calculations of highest possible complexity reproduce the fragmentation and overall behavior of the $E 1$ average elastic cross section well, the predicted absolute cross sections are approximately twice as high as the experimental upper limits even though the latter also include an estimate of the inelastic-decay channel.
Cited by 7
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Cited by 4
- 26 October 2022
- Published by American Physical Society (APS) in Physical Review C
Low-lying dipole strength distribution in ${}^{204}{Pb}$
by T. Shizuma, S. Endo, A. Kimura, R. Massarczyk, R. Schwengner, R. Beyer, T. Hensel, H. Hoffmann, A. Junghans, K. Römer, et al.
Dipole and quadrupole strength distribution of ${}^{204}{Pb}$ was investigated via a nuclear resonance fluorescence experiment using bremsstrahlung produced using an electron beam at a kinetic energy of 10.5 MeV at the linear accelerator ELBE. We identified 136 states resonantly excited at energies from 3.6 to 8.4 MeV. Spins of the excited states were deduced by angular distribution ratios of $γ$ rays observed at scattering angles of $90^{\circ}$ and $127^{\circ}$ with respect to the incident $γ$ beam. The analysis of the measured $γ$ -ray spectra includes the quasicontinuum of levels at high energy. Monte Carlo simulation of $γ$ -ray cascades were performed to obtain the intensities of inelastic transitions and branching ratios of the ground-state transitions. The present experimental results were used to investigate the electric dipole $(E 1)$ strengths by comparison with predictions from the quasiparticle-phonon model with the self-consistent energy density functional.
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- 26 October 2022
- Published by American Physical Society (APS) in Physical Review C
Low-lying dipole strength distribution in ${}^{204}{Pb}$
by T. Shizuma, S. Endo, A. Kimura, R. Massarczyk, R. Schwengner, R. Beyer, T. Hensel, H. Hoffmann, A. Junghans, K. Römer, et al.
Dipole and quadrupole strength distribution of ${}^{204}{Pb}$ was investigated via a nuclear resonance fluorescence experiment using bremsstrahlung produced using an electron beam at a kinetic energy of 10.5 MeV at the linear accelerator ELBE. We identified 136 states resonantly excited at energies from 3.6 to 8.4 MeV. Spins of the excited states were deduced by angular distribution ratios of $γ$ rays observed at scattering angles of $90^{\circ}$ and $127^{\circ}$ with respect to the incident $γ$ beam. The analysis of the measured $γ$ -ray spectra includes the quasicontinuum of levels at high energy. Monte Carlo simulation of $γ$ -ray cascades were performed to obtain the intensities of inelastic transitions and branching ratios of the ground-state transitions. The present experimental results were used to investigate the electric dipole $(E 1)$ strengths by comparison with predictions from the quasiparticle-phonon model with the self-consistent energy density functional.
Cited by 4
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Cited by 6
- 21 October 2022
- Published by American Physical Society (APS) in Physical Review C
Model-independent determination of the dipole response of ${}^{66}{Zn}$ using quasimonoenergetic and linearly polarized photon beams
by D. Savran, J. Isaak, R. Schwengner, R. Massarczyk, M. Scheck, W. Tornow, G. Battaglia, T. Beck, S. W. Finch, C. Fransen, et al.
Background: Photon strength functions are an important ingredient in calculations relevant for the nucleosynthesis of heavy elements. The relation to the photoabsorption cross section allows to experimentally constrain photon strength functions by investigating the photoresponse of atomic nuclei.
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- 21 October 2022
- Published by American Physical Society (APS) in Physical Review C
Model-independent determination of the dipole response of ${}^{66}{Zn}$ using quasimonoenergetic and linearly polarized photon beams
by D. Savran, J. Isaak, R. Schwengner, R. Massarczyk, M. Scheck, W. Tornow, G. Battaglia, T. Beck, S. W. Finch, C. Fransen, et al.
Background: Photon strength functions are an important ingredient in calculations relevant for the nucleosynthesis of heavy elements. The relation to the photoabsorption cross section allows to experimentally constrain photon strength functions by investigating the photoresponse of atomic nuclei.
Cited by 6
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Cited by 18
- 28 March 2022
- Published by American Physical Society (APS) in Physical Review C
Evolution of low-lying M1 modes in germanium isotopes
by S. Frauendorf, R. Schwengner
Magnetic dipole strength functions are determined for the series of germanium isotopes from $N = Z = 32$ to $N$ = 48 on the basis of a large number of transition strengths calculated within the shell model. The evolution of the strength with increasing neutron number in the $1 g_{9 / 2}$ orbital is analyzed. A bimodal structure comprising an enhancement toward low transition energy and a resonance in the region of the scissors mode is identified. The low-energy enhancement is strongest near closed shells, in particular at the almost completely filled $1 g_{9 / 2}$ orbital, while the scissorslike resonance is most pronounced in the middle of the open shell, which correlates with the magnitude of the also deduced electric quadrupole transition strengths. The results are consistent with previous findings for the shorter series of iron isotopes and prove the occurrence and correlation of the two low-lying magnetic dipole modes as a global structural feature.
Website
Google Scholar
- 28 March 2022
- Published by American Physical Society (APS) in Physical Review C
Evolution of low-lying M1 modes in germanium isotopes
by S. Frauendorf, R. Schwengner
Magnetic dipole strength functions are determined for the series of germanium isotopes from $N = Z = 32$ to $N$ = 48 on the basis of a large number of transition strengths calculated within the shell model. The evolution of the strength with increasing neutron number in the $1 g_{9 / 2}$ orbital is analyzed. A bimodal structure comprising an enhancement toward low transition energy and a resonance in the region of the scissors mode is identified. The low-energy enhancement is strongest near closed shells, in particular at the almost completely filled $1 g_{9 / 2}$ orbital, while the scissorslike resonance is most pronounced in the middle of the open shell, which correlates with the magnitude of the also deduced electric quadrupole transition strengths. The results are consistent with previous findings for the shorter series of iron isotopes and prove the occurrence and correlation of the two low-lying magnetic dipole modes as a global structural feature.
Cited by 18
Open Access
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Cited by 9
- 4 February 2022
- Published by American Physical Society (APS) in Physical Review C
Photoexcitation of ${}^{76}{Ge}$
by R. Schwengner, R. Massarczyk, K. Schmidt, K. Zuber, R. Beyer, D. Bemmerer, S. Hammer, A. Hartmann, T. Hensel, H. F. Hoffmann, et al.
The dipole strength of the nuclide ${}^{76}{Ge}$ was studied in photon-scattering experiments using bremsstrahlung produced with electron beams of energies of 7.8 and 12.3 MeV delivered by the electron linear accelerator of high brilliance and high brightness (ELBE). We identified 210 levels up to an excitation energy of 9.4 MeV and assigned spin $J$ = 1 to most of them. The quasicontinuum of unresolved transitions was included in the analysis of the spectra and the intensities of branching transitions were estimated on the basis of simulations of statistical $γ$ -ray cascades. The photoabsorption cross section up to the neutron-separation energy was determined and is compared with predictions of the statistical reaction model. The derived photon strength function is compared with results of experiments using other reactions.
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- 4 February 2022
- Published by American Physical Society (APS) in Physical Review C
Open Access
Photoexcitation of ${}^{76}{Ge}$
by R. Schwengner, R. Massarczyk, K. Schmidt, K. Zuber, R. Beyer, D. Bemmerer, S. Hammer, A. Hartmann, T. Hensel, H. F. Hoffmann, et al.
The dipole strength of the nuclide ${}^{76}{Ge}$ was studied in photon-scattering experiments using bremsstrahlung produced with electron beams of energies of 7.8 and 12.3 MeV delivered by the electron linear accelerator of high brilliance and high brightness (ELBE). We identified 210 levels up to an excitation energy of 9.4 MeV and assigned spin $J$ = 1 to most of them. The quasicontinuum of unresolved transitions was included in the analysis of the spectra and the intensities of branching transitions were estimated on the basis of simulations of statistical $γ$ -ray cascades. The photoabsorption cross section up to the neutron-separation energy was determined and is compared with predictions of the statistical reaction model. The derived photon strength function is compared with results of experiments using other reactions.
Cited by 9
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Cited by 1
- 3 January 2022
- Published by American Physical Society (APS) in Physical Review C
Low-energy magnetic dipole strength in cadmium isotopes
by R. Schwengner
Magnetic-dipole strength functions have been deduced from averages of large numbers of $M 1$ transition strengths calculated within the shell model for the nuclides ${}^{105}{Cd}$ , ${}^{106}{Cd}$ , ${}^{111}{Cd}$ , and ${}^{112}{Cd}$ . Enhancements of the $M 1$ strengths toward low transition energy have been found for all nuclides considered. These properties are compared with those of experimental photon strength functions obtained from ${}^{3}{He}$ -induced reactions, which seem to indicate a disappearance of the low-energy enhancement in the heavier isotopes.
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- 3 January 2022
- Published by American Physical Society (APS) in Physical Review C
Low-energy magnetic dipole strength in cadmium isotopes
by R. Schwengner
Magnetic-dipole strength functions have been deduced from averages of large numbers of $M 1$ transition strengths calculated within the shell model for the nuclides ${}^{105}{Cd}$ , ${}^{106}{Cd}$ , ${}^{111}{Cd}$ , and ${}^{112}{Cd}$ . Enhancements of the $M 1$ strengths toward low transition energy have been found for all nuclides considered. These properties are compared with those of experimental photon strength functions obtained from ${}^{3}{He}$ -induced reactions, which seem to indicate a disappearance of the low-energy enhancement in the heavier isotopes.
Cited by 1

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