Alexander Fix
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Previous Organizations / Institutes
The organizations / institutes from the scholar's other articles in the past ten years
Research Subjects
Research Interests
Alexander Fix has a total of 164 co-authors. Here are the top co-authors by number of shared publications:
- A. Yu. Loginov
Tomsk State University of Control Systems and Radioelectronics
5 shared publications - Eed M. Darwish
Physics Department, Faculty of Science, Taibah University, Medina 41411, Saudi Arabia
5 shared publications - Vyacheslav Gauzshtein
National Research Tomsk Polytechnic University, Tomsk, Russia
5 shared publications - I. A. Rachek
Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia
4 shared publications D. M. Nikolenko
Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia
3 shared publicationsH. Arenhövel
Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany
3 shared publications
Latest Publications
- 7 October 2026
- Published by World Scientific Pub Co Pte Ltd in International Journal of Modern Physics E
A comparative analysis of FSI effects in the γd→pnπ0 reaction at low and high neutron momenta
We report measurements of the tensor analyzing power [Formula: see text] for incoherent neutral pion photoproduction on the deuteron, [Formula: see text], at photon energies 300–600[Formula: see text]MeV. The data reveal a clear kinematic transition in the reaction mechanism. At low neutron momenta ([Formula: see text] [Formula: see text]MeV/c), [Formula: see text] is governed by the deuteron D-wave component, providing a direct probe of the deuteron structure. At high neutron momenta ([Formula: see text] [Formula: see text]MeV/c), the observable becomes sensitive to the reaction dynamics, with final state interactions dominating the production mechanism. This transition demonstrates that [Formula: see text] can discriminate between quasi-free and rescattering-dominated processes. The results are compared with theoretical calculations based on the MAID2007 model with explicit inclusion of [Formula: see text] and [Formula: see text] rescattering, showing good agreement across both kinematic regimes.
- 7 October 2026
- Published by World Scientific Pub Co Pte Ltd in International Journal of Modern Physics E
A comparative analysis of FSI effects in the γd→pnπ0 reaction at low and high neutron momenta
We report measurements of the tensor analyzing power [Formula: see text] for incoherent neutral pion photoproduction on the deuteron, [Formula: see text], at photon energies 300–600[Formula: see text]MeV. The data reveal a clear kinematic transition in the reaction mechanism. At low neutron momenta ([Formula: see text] [Formula: see text]MeV/c), [Formula: see text] is governed by the deuteron D-wave component, providing a direct probe of the deuteron structure. At high neutron momenta ([Formula: see text] [Formula: see text]MeV/c), the observable becomes sensitive to the reaction dynamics, with final state interactions dominating the production mechanism. This transition demonstrates that [Formula: see text] can discriminate between quasi-free and rescattering-dominated processes. The results are compared with theoretical calculations based on the MAID2007 model with explicit inclusion of [Formula: see text] and [Formula: see text] rescattering, showing good agreement across both kinematic regimes.
- 3 December 2024
- Published by American Physical Society (APS) in Physical Review C
- Vol. 110 (6)
Coherent photoproduction on the deuteron in the region of- 3 December 2024
- Published by American Physical Society (APS) in Physical Review C
- Vol. 110 (6)
Coherent photoproduction on the deuteron in the region of- 29 August 2024
- Published by Springer Nature in The European Physical Journal A
- Vol. 60 (8) , 1-9
Partial-wave analysis for photoproduction of pseudoscalar mesons with truncation in total angular momentum
- 29 August 2024
- Published by Springer Nature in The European Physical Journal A
- Vol. 60 (8) , 1-9
Partial-wave analysis for photoproduction of pseudoscalar mesons with truncation in total angular momentum
- 11 October 2023
- Published by American Physical Society (APS) in Physical Review C
- Vol. 108 (4) , 044607
Photoproduction of pseudoscalar mesons on -shell nuclei at high energies and forward anglesI address the issue of coherent and incoherent photoproduction of pseudoscalar mesons on nuclei at high photon energies in the peripheral region, characterized by small momentum transfer. The reactions considered give prominent background to photoproduction in the electromagnetic field of a nucleus. For this reason, a detailed knowledge of their cross sections is necessary for correct determination of the radiative decay widths of neutral mesons. Particular attention is paid to transitions to the discrete bound levels, as well as to the giant resonance states. Numerical results are presented for photoproduction of mesons on .- 11 October 2023
- Published by American Physical Society (APS) in Physical Review C
- Vol. 108 (4) , 044607
Photoproduction of pseudoscalar mesons on -shell nuclei at high energies and forward anglesI address the issue of coherent and incoherent photoproduction of pseudoscalar mesons on nuclei at high photon energies in the peripheral region, characterized by small momentum transfer. The reactions considered give prominent background to photoproduction in the electromagnetic field of a nucleus. For this reason, a detailed knowledge of their cross sections is necessary for correct determination of the radiative decay widths of neutral mesons. Particular attention is paid to transitions to the discrete bound levels, as well as to the giant resonance states. Numerical results are presented for photoproduction of mesons on .- Open Access
Measurement of the Tensor-Analyzing Power Component T20 for Incoherent Negative Pion Photoproduction on a Deuteron
New results for the -component of the tensor-analyzing power of the incoherent negative pion photoproduction are presented. The experiment was performed for the electron beam energy of 800 MeV at the VEPP-3 storage ring in 2021. To extract the -component, we used asymmetry with respect to the change in the sign of the tensor polarization of the deuteron target. Identification of the reaction events was carried out by the detection of two protons in coincidence. Experimental data were compared with the results of statistical simulation, considering the interaction between the and subsystems in the final state of the reaction.Open AccessMeasurement of the Tensor-Analyzing Power Component T20 for Incoherent Negative Pion Photoproduction on a Deuteron
New results for the -component of the tensor-analyzing power of the incoherent negative pion photoproduction are presented. The experiment was performed for the electron beam energy of 800 MeV at the VEPP-3 storage ring in 2021. To extract the -component, we used asymmetry with respect to the change in the sign of the tensor polarization of the deuteron target. Identification of the reaction events was carried out by the detection of two protons in coincidence. Experimental data were compared with the results of statistical simulation, considering the interaction between the and subsystems in the final state of the reaction. - 11 April 2023
- Published by IOP Publishing in Journal of Physics G: Nuclear and Particle Physics
- Vol. 50 (5) , 055107
Ambiguities in a partial-wave analysis of γ p → π 0 p with truncation in total angular momentum
We address some questions related to the discrete ambiguity problem in a truncated partial-wave analysis in the case when the helicity basis together with truncation in total angular momentum j is employed. As a numerical application, we consider the case j max = 3 / 2 using as input the MAID2007 and SAID multipoles in the γ p → π 0 p channel.
- 11 April 2023
- Published by IOP Publishing in Journal of Physics G: Nuclear and Particle Physics
- Vol. 50 (5) , 055107
Ambiguities in a partial-wave analysis of γ p → π 0 p with truncation in total angular momentum
We address some questions related to the discrete ambiguity problem in a truncated partial-wave analysis in the case when the helicity basis together with truncation in total angular momentum j is employed. As a numerical application, we consider the case j max = 3 / 2 using as input the MAID2007 and SAID multipoles in the γ p → π 0 p channel.
- 1 April 2023
- Published by Allerton Press in Moscow University Physics Bulletin
- Vol. 78 (2) , 149-154
Measurement of the Tensor Analyzing Power $\boldsymbol{T}_{\mathbf{20}}$ for the Reaction ${\gamma}\boldsymbol{d\to pn}{\pi}^{\mathbf{0}}$ in the Region of Low Proton EnergiesIn this paper, we present new experimental results for the tensor analyzing power $$T_{20}$$ of the reaction $$\gamma d\to pn\pi^{0}$$ in the region of low- 1 April 2023
- Published by Allerton Press in Moscow University Physics Bulletin
- Vol. 78 (2) , 149-154
Measurement of the Tensor Analyzing Power $\boldsymbol{T}_{\mathbf{20}}$ for the Reaction ${\gamma}\boldsymbol{d\to pn}{\pi}^{\mathbf{0}}$ in the Region of Low Proton EnergiesIn this paper, we present new experimental results for the tensor analyzing power $$T_{20}$$ of the reaction $$\gamma d\to pn\pi^{0}$$ in the region of low- Open Access
Discrete ambiguities in a partial-wave analysis of pseudoscalar photoproduction with truncation in total angular momentum
The discrete ambiguities appearing in the complete experiment problem for single pseudoscalar meson photoproduction within truncated partial-wave analysis are discussed. It is shown that, in addition to the double ambiguity known from previous works, it is always necessary to take into account another ambiguity arising when truncation in total angular momentum is employed.
Open AccessDiscrete ambiguities in a partial-wave analysis of pseudoscalar photoproduction with truncation in total angular momentum
The discrete ambiguities appearing in the complete experiment problem for single pseudoscalar meson photoproduction within truncated partial-wave analysis are discussed. It is shown that, in addition to the double ambiguity known from previous works, it is always necessary to take into account another ambiguity arising when truncation in total angular momentum is employed.
- 22 August 2022
- Published by American Physical Society (APS) in Physical Review C
- Vol. 106 (2) , 024613
Simplification of the complete-experiment problem for photoproduction of two pseudoscalar mesons on a nucleon in a truncated partial-wave analysis
It is shown that within a truncated partial-wave analysis for photoproduction of two pseudoscalar mesons, it is possible to halve the number of independent partial amplitudes by taking into account parity conservation. In addition, within the framework of the proposed formalism, one can rather easily resolve the double discrete ambiguity arising from the symmetry under complex conjugation of the helicity amplitudes. This leads to essential simplifications of the complete experiment problem, at least, as far as mathematical aspects are concerned.
- 22 August 2022
- Published by American Physical Society (APS) in Physical Review C
- Vol. 106 (2) , 024613
Simplification of the complete-experiment problem for photoproduction of two pseudoscalar mesons on a nucleon in a truncated partial-wave analysis
It is shown that within a truncated partial-wave analysis for photoproduction of two pseudoscalar mesons, it is possible to halve the number of independent partial amplitudes by taking into account parity conservation. In addition, within the framework of the proposed formalism, one can rather easily resolve the double discrete ambiguity arising from the symmetry under complex conjugation of the helicity amplitudes. This leads to essential simplifications of the complete experiment problem, at least, as far as mathematical aspects are concerned.
- 22 June 2022
- Published by Springer Nature in The European Physical Journal A
- Vol. 58 (6) , 1-8
The $\gamma d\rightarrow \pi ^0\eta d$ reaction and extraction of the $\eta d$ scattering length- 22 June 2022
- Published by Springer Nature in The European Physical Journal A
- Vol. 58 (6) , 1-8
The $\gamma d\rightarrow \pi ^0\eta d$ reaction and extraction of the $\eta d$ scattering length