- Published on 16 November 2022
“The Nuclear Many-Body Problem”
Professor Peter Schuck was a worldwide respected leading expert in Nuclear Theory and Many Body Physics who passed away on September 10, 2022. He advanced many-particle approaches for nuclear matter, introducing new concepts, in particular the quasi-particle approaches in connection with nuclear superfluidity. He contributed very successfully to cluster formation in nuclear systems, in particular alpha-particle condensation and quartetting at subsaturation densities. Together with Peter Ring, he co-authored the famous book on The Nuclear Many-Body Problem.
This Topical Collection (TC) aims at a comprehensive compilation of developments that Peter Schuck advanced after the book was published, so that it could be considered a continuation of the book, devoted to the modern aspects of the nuclear many-body problem.
- Published on 16 November 2022
Several decades ago, proton knock-out experiments from valence states clearly showed a reduction in the measured cross sections as compared to mean field calculations. While theory anticipated that the difference was mainly due to correlations between nucleons in the nucleus, it proved extremely challenging to prove this experimentally due to reaction mechanisms such as final-state interaction and meson exchange currents. With the advent of high luminosity, multi-GeV accelerators, experimentalists in the 21st century were able to isolate the signal of short-range correlations and usher in a period of rapid progress on a topic that had long been stalled. One of the most surprising of the new results is a correlation between the strength of short-range correlations and the magnitude of the deep inelastic EMC effect. For these reasons, the editors of the European Physical Journal A (EPJA) have suggested that a Topical Collection devoted to research on short-range correlations and the EMC effect be published.
- Published on 02 November 2022
Historically, radiative corrections were applied through correction factors to experimental data. Complicated modern experiments require implementing radiative processes in a full experimental simulation. The cross section for internal radiation depends strongly on the angles between photon and lepton lines, rising quickly over multiple orders when the photon is nearly collinear with a lepton. This presents challenges in the efficiency and numerical stability of MC simulations. Current, modern generators overcome this either via brute-force, averaging over small phase space elements to reduce the numerical instability, or by biasing the random number generation. A concerted effort by the community to author next-generation generators, addressing existing issues and incorporating the best available theoretical calculations, is required.
This Topical Collection will give the community a guideline of the precision available now, and conversely inform the theoretical and computational community on future requirements.
- Published on 24 September 2020
An important achievement of the refined shell model for the nucleus was the prediction of new shell closures at proton number 114 and neutron number 184. In addition, the model predicted decay properties, which led to the expectation that an “island of stability” would be located near these proton and neutron numbers. Experiments confirmed the predicted properties of part of these super-heavy nuclei during the last 20 years. Already in the 1980s, experimentally confirmed was a region of deformed super-heavy nuclei near proton and neutron numbers 108 and 162, respectively. Whereas only a few isotopes could be produced in the discovery experiments, the increase of the experimental sensitivity makes now and in future a more detailed study of these super-heavy systems possible. For this reason, the editors of the European Physical Journal A, N. Alamanos and M.J.G. Borge, suggested that a special edition be devoted to research on super-heavy nuclei and elements.