Nuclear theory sits at the fascinating intersection of particle physics and the forces that hold our universe together. This field explores how protons and neutrons bind inside atomic nuclei, seeking to understand the fundamental interactions that govern matter at its most dense and energetic levels. While the mathematics involved can be incredibly complex, the core questions are deeply human: how does the universe function at its smallest scales, and what happens when we push matter to its limits?

At Gist.Science, we make these cutting-edge discoveries accessible by processing every new preprint published in this category on arXiv. Our team transforms dense academic manuscripts into clear, plain-language summaries alongside detailed technical overviews, ensuring that both experts and curious readers can grasp the latest breakthroughs without getting lost in the jargon. Below are the latest papers in nuclear theory, distilled and ready for you to explore.

Dissociation-driven quarkonium spin alignment in Pb--Pb collisions at sNN=5.02\sqrt{s_{\rm NN}} = 5.02 TeV

This study proposes that medium vorticity induces spin-dependent dissociation of quarkonia via a modified color-singlet potential, thereby altering their spin alignment (ρ00\rho_{00}) in Pb--Pb collisions at sNN=5.02\sqrt{s_{\rm NN}} = 5.02 TeV and offering new insights into the microscopic dynamics of the vortical quark-gluon plasma.

Bhagyarathi Sahoo, Captain R. Singh, Raghunath Sahoo2026-03-25⚛️ nucl-ex

\textit{Ab initio} calculations of first-forbidden β\beta transitions in the reactor antineutrino anomaly

This paper presents the first \textit{ab initio} calculations of key first-forbidden β\beta transitions using chiral nuclear forces, demonstrating that incorporating these microscopic shape factors into reactor antineutrino spectrum models yields a pronounced enhancement around 5 MeV that may partially explain the observed "5 MeV bump" and the reactor antineutrino anomaly.

X. Y. Xu, Z. Y. Meng, Z. C. Xu, F. R. Xu2026-03-25⚛️ nucl-th

Structure of QC2_2D ground state fields at nonzero matter densities

This paper presents a quantitative lattice study of two-color QCD at finite chemical potential, revealing that chromo-electromagnetic field strengths undergo a finite-volume crossover near μ=mπ/2\mu = m_\pi/2 with initial suppression followed by enhancement, while the difference between squared electric and magnetic fields grows monotonically with density.

Ragib F. Hasan, Matthew Cummins, Waseem Kamleh, Dale Lawlor, Derek Leinweber, Ian van Schalkwyk, Jon-Ivar Skullerud2026-03-25⚛️ hep-lat

Finite-nuclear-size effect for hydrogenlike ions under high external pressure

This study investigates how high external pressure, modeled via an impenetrable spherical cavity, significantly enhances finite-nuclear-size corrections and electron-capture decay rates in confined hydrogenlike ions while lifting level degeneracies and altering the relative magnitudes of these corrections across different bound states.

Dengshan Liu, Huihui Xie, Pengxiang Du, Tianshuai Shang, Jian Li, Jiguang Li, Tomoya Naito2026-03-25🔬 physics.atom-ph

Shape Polarization and Quasiparticle Alignment in the [523]5/2 and [642]5/2 bands of 169^{169}Hf

This study utilizes Total Routhian Surface calculations to explain the distinct signature inversion in the [523]5/2 band and conventional splitting in the [642]5/2 band of 169^{169}Hf by revealing how a Z=72 proton subshell gap locks the core while neutron-driven shape bifurcations and gamma-softness dictate the alignment dynamics and rotational behavior of these signature partner bands.

Rong-Xin Nie, Xue-Hui Ai, Xin Guan, Jie Yang2026-03-25⚛️ nucl-th