Nuclear Theory·nucl-th

Monday·March 10, 2025

8 papers—4 primary·4 cross-listed

05
Development and Benchmarking of JANGOFETT: A Novel Geant4-Operated Fission Event Tracking Tool
Liam Walker · Jack Shire · Jacob Jaffe · Payton Sprando · Jack Olinger · Alexander Chemey
Experiments measuring fission observables encounter false coincidences arising from timing overlap of separate fission product decays. Simulations of both fission observables and particles in detector systems exist, but have not yet been combined to produce accurate event-by-event outputs in a time-dependent manner. Geant4 is a powerful simulation tool for nuclear physics studies, but it does not handle multiple initial particles in a single simulation instance, nor does it feature high fidelity fission sampling. JANGOFETT: A Novel Geant4-Operated Fission Event Tracking Tool has been developed to address this challenge. The tool utilizes simulated fission data from an external program in conjunction with Geant4, which has been modified to produce a single timeline of events over an entire simulated experiment. The physical accuracy of the simulated overlapping energy depositions within detectors has been verified via simulation of fission products from the spontaneous fission of 252Cf.
↳ physics.ins-detnucl-exnucl-thNucl.Instrum.Meth.A(2026)·0 citations
06
Improved evaluation of the electroweak contribution to muon $g - 2$
Martin Hoferichter🇨🇭 · Jan Lüdtke🇦🇹 · Luca Naterop🇨🇭 · Massimiliano Procura🇦🇹 · Peter Stoffer🇨🇭
A precise evaluation of the electroweak contribution to the anomalous magnetic moment of the muon requires control over all aspects of the Standard Model, ranging from Higgs physics, over multi-loop computations for bosonic and (heavy-)fermion diagrams, to non-perturbative effects in the presence of light quarks. Currently, the dominant uncertainties arise from such hadronic effects in the vector-vector-axial-vector three-point function, an improved understanding of which has recently emerged in the context of hadronic light-by-light scattering. Profiting from these developments as well as new perturbative and non-perturbative input for the charm contribution, we obtain $a_{μ}^{EW} = 154.4 (4) \times 1 0^{- 11}$ .
↳ hep-phhep-exhep-latnucl-thPRL(2025)·45 citations
07
$t$ + $t$ cluster states in $^{6}$ He
W. H. Ma · D. Y. Tao · B. Zhou · J. S. Wang · Y. G. Ma · D. Q. Fang · W. B. He · Y. Y. Yang · J. B. Ma · S. L. Jin · P. Ma · J. X. Li and 12 other authors
The study of $t$ + $t$ cluster states in $^{6}$ He provides valuable insights into exotic nuclear structures and the behavior of fermionic cluster systems. This study shows rich cluster resonant state structures above the threshold, identified by experimental reconstruction and theoretical calculations. The excitation energy spectrum above the $t$ + $t$ threshold in $^{6}$ He is measured via the fragmentation excitation process during the breakup reaction of $^{9}$ Li on a $^{208}$ Pb target at an incident energy of 32.7 MeV/nucleon. The resonant states are reconstructed from the final state coincident particles $t$ + $t$ using the invariant mass method, while the non-resonant background is estimated using the event mixing method. Two states of energy level peaks at $13.9 \pm 0.3$ and $15.0 \pm 0.3$ MeV are observed. Microscopic cluster model calculations exploring the $t + t$ resonant states in $^{6} He$ yield theoretical energy spectra which are then compared with the current experimental results. The calculated reduced width amplitudes (RWA) of the $t + t$ channels further confirm the clustering structure of the identified $t + t$ resonant states.
↳ nucl-exnucl-th0 citations
08
Systematic optimization of resonance parameters in a transport approach
Carl B. Rosenkvist🇩🇪 · Hannah Elfner🇩🇪
This study optimizes resonance parameters responsible for strangeness production in the SMASH (Simulating Many Accelerated Strongly-interacting Hadrons) transport model using a genetic algorithm. By fitting resonance parameters to experimental data on exclusive strangeness cross-sections at low energies, we significantly improve the model's accuracy, especially in pion-proton interactions. Our approach explores how machine learning tools can be used for precise resonance tuning in transport approaches.
↳ hep-phnucl-exnucl-thPRC(2025)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE

Development and Benchmarking of JANGOFETT: A Novel Geant4-Operated Fission Event Tracking Tool

Improved evaluation of the electroweak contribution to muon g−2

t+t cluster states in 6He

Systematic optimization of resonance parameters in a transport approach

Affiliations

Improved evaluation of the electroweak contribution to muon $g - 2$

$t$ + $t$ cluster states in $^{6}$ He