Ab initio nuclear many-body methods have become powerful tools for describing nuclei across the nuclear chart, providing predictive insights into nuclear structure and dynamics from realistic QCD-based interactions. This talk reviews the basic principles of these approaches, highlights recent advances in their extension to deformed nuclei, including the newly developed deformed self-consistent...
A deeper understanding of nucleon-induced reactions remains essential for nuclear theory as for applications in nuclear data. Several approaches have been developed in the last decades to correctly describe cross-sections for light particle emission, but it is still not possible to predict them for any nucleus in an arbitrary energy range with reasonable accuracy for practical applications. On...
Atmospheric radionuclide monitoring with high-purity germanium (HPGe) detectors is a crucial component of verifying compliance with treaties that prohibit the use of nuclear weapons, such as the Comprehensive Nuclear-Test-Ban Treaty (CTBT). To improve detection sensitivity, coincidence gamma-ray spectrometers, which measure gamma rays emitted in a cascade, are being developed. The CoSpeR...
We study the connection between accidental symmetries in the nuclear interaction and spin entanglement in two-nucleon scattering. Specifically, we incorporate different levels of Wigner $SU(4)$ and Serber symmetries into leading-order potentials derived from chiral effective field theory. We conduct a quantitative analysis by computing the full $S$ matrix, demonstrating that the neutron-proton...
The strong force governing Nucleon-Nucleon (NN) scattering can be modelled using chiral effective field theory -- a systematic low-energy expansion that preserves the symmetries of quantum chromodynamics. In this framework, NN scattering observables are predicted order-by-order. The series is truncated to facilitate computations, and the omission of higher-order terms leads to a theoretical...
The Belle II experiment at the SuperKEKB collider in Japan is a high-luminosity B-factory designed to study B mesons in detail. However, due to the large number of charm quarks produced in electron-positron collisions, Belle II also functions effectively as a charm-factory. Its excellent vertexing, tracking, and particle identification allow precise studies of charm meson decays, including...
On behalf of the HADES and CBM collaborations.
Hyperons, baryons containing at least one strange quark, are pivotal to advancing our understanding of matter under extreme conditions. They are hypothesized to play a crucial role in the dense cores of neutron stars, where their emergence is expected at densities exceeding nuclear saturation. Among hyperons, Λ hyperons are of particular...
The ALICE group at Lund studies collisions of protons and heavy ions at the Large Hadron Collider to explore the behavior of nuclear matter under extreme conditions. These studies aim to understand how quarks and gluons interact and form the particles we observe.
Measurements of strange hadrons in small collision systems have revealed unexpected features, such as enhanced strangeness...
The fission process forms highly excited fragments carrying significant amounts of angular momentum. This formation is generally described via a shape evolution on the potential energy landscape of the fissioning system. Among the aspects that are still hard to describe in this process is the generation of the fragment angular momenta, highlighted by the work of Wilhelmy et al. in the early...
The study of nuclear fission remains a critical area of research, not only for understanding fundamental nuclear properties but also for its implications in the production of heavy elements in astrophysical environments. In r-process nucleosynthesis, fission plays a crucial role as it ultimately limits the mass of nuclei that can be produced. Currently, very limited data on fission barriers of...
The experiment IS739 studied fission reactions of radioactive beams in inverse kinematics at the ISOLDE Solenoidal Spectrometer (ISS). It required about 150 new channels of silicon detector readout. Placed after the REX/HIE-ISOLDE post-accelerator, ISS uses a free-running data acquisition system to cope with the low but intense duty cycle of the accelerator.
Readout of the new fission...
The $\mbox{Belle}~\mbox{II}$ experiment began collecting data in 2019 and has since accumulated approximately 500 million $B\bar{B}$ meson pair events produced in $e^+e^-$ collisions. The decays of these $B$ mesons into charmless final states, i.e. those containing no charm quarks, are dominated by loop transitions. Potential new physics particles may be able to enter these loops, making such...
Reliable track reconstruction is vital for Belle II, especially as detector conditions evolve. The full tracking chain in the Belle II Analysis Software Framework (basf2) combines CDC-seeded and SVD-seeded tracking stages, which are merged and cleaned to produce final tracks. We focus on optimising the SVD-seeded CKF extension into the CDC, where SVD-only tracks are extrapolated to attach CDC...
