nucl-th papers | Gist.Science

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.

⚛️ nuclear experiments

On the nature of fully-charmed four-quark exotic state $X(6900)$ from its photoproduction off nuclei

This paper investigates the photoproduction of the fully-charmed tetraquark state $X(6900)$ off nuclei near the kinematic threshold using a collision model, demonstrating that specific observables like excitation functions and transparency ratios are sensitive to its internal structure (compact tetraquark, molecular, or mixed) and can thus help determine its nature in future experiments at electron-ion colliders.

E. Ya. Paryev2026-08-05

⚛️ nuclear theory

Local Spin Polarization in Anisotropic Gubser Flow: Suppression Mechanism and Formulation Dependence

This paper analytically demonstrates that in anisotropic Gubser flow, the experimentally observed sign of longitudinal spin polarization arises from the interplay between thermal vorticity and thermal shear, with the specific outcome heavily dependent on the choice of reference unit vector formulation and the dominance of acceleration effects leading to cancellations.

Kenji Fukushima, Shi Pu, Dong-Lin Wang2026-08-05

⚛️ nuclear experiments

Nuclei with enhanced Schiff moments in practical elements for atomic and molecular EDM measurements

This resource paper provides AMO experimentalists with a qualitative guide on identifying practical isotopes with enhanced nuclear Schiff moments to support the search for time-reversal breaking effects in atomic and molecular EDM measurements.

J. A. Behr2026-08-04

⚛️ nuclear experiments

Neutron-rich nuclei and neutron skins from chiral low-resolution interactions

This paper introduces novel chiral low-resolution interactions that accurately describe bulk properties across the nuclear chart from $^{16}$ O to $^{208}$ Pb, enabling precise predictions of neutron skins in neutron-rich nuclei with specific sensitivities for extreme, experimentally unexplored cases.

P. Arthuis, K. Hebeler, A. Schwenk2026-08-04

⚛️ nuclear theory

Medium modifications of $1P$ -wave charmonia $χ_{cJ}(1P)$ in cold nuclear matter

Using the quark-meson coupling model with in-medium loop contributions, this study predicts significant mass reductions of approximately 60 MeV for $1P$ -wave charmonia ( $\chi_{cJ}$ ) in cold nuclear matter at normal density, while finding no level crossing with the $D\bar{D}$ threshold up to three times normal density, a phenomenon potentially observable at FAIR and RHIC.

Ze-Hua Zhang, Xiang Liu2026-08-04

⚛️ nuclear theory

Observable Signatures of a Quarkyonic Phase in Neutron Stars

This paper demonstrates through Bayesian inference that quarkyonic matter equations of state are consistent with current neutron star observations and identifies specific mass-radius signatures, such as curve curvature and central sound speed, that can distinguish neutron stars with quarkyonic cores from those without.

Probit J Kalita, Tuhin Malik, Tianqi Zhao, Bharat Kumar, James M. Lattimer2026-08-04

⚛️ nuclear experiments

Analysis of $M1$ capture in the $α(d,γ)^6$ Li reaction

This paper analyzes the $M1$ capture in the $\alpha(d,\gamma)^6$ Li reaction using an effective operator to demonstrate that isoscalar transitions from an initial $S$ wave are forbidden without distortion, resulting in a negligible $M1$ $S$ -factor at small energies where the dominant contribution arises from transitions to isospin 1 components of the ground state.

Ergash M. Tursunov, Daniel Baye2026-08-04

⚛️ nuclear theory

The Role of Ab Initio Beta-Decay Calculations in Light Nuclei for Probes of Physics Beyond the Standard Model

This review comprehensively examines how state-of-the-art *ab initio* nuclear many-body calculations of radiative, recoil-order, and isospin-breaking corrections for light nuclei enable precision tests of the Standard Model and searches for physics beyond it, particularly in determining $V_{ud}$ and identifying exotic weak currents.

Grigor H. Sargsyan, Garrett B. King, Ayala Glick-Magid, Chien-Yeah Seng2026-08-04

⚛️ nuclear theory

Astrophysical S-factor Calculation for p-p Fusion Reaction

This paper presents a new calculation of the astrophysical S-factor for the p-p fusion reaction, yielding a value approximately one order of magnitude lower than accepted standards by utilizing a genetic algorithm-optimized inverse scattering potential and an exact WKB action integral that accounts for the specific shape of the interaction rather than relying on the bare Coulomb approximation.

Arushi Sharma, Ishwar Kant, O. S. K. S. Sastri2026-08-04

⚛️ phenomenology

Testing Lepton Wave Function Factorization in $^{71}\text{Ge}$ Electron Capture

This paper presents a general framework for predicting electron capture rates in $^{71}\mathrm{Ge}$ using exact leptonic wave functions and a non-factorized treatment of the transition matrix element to quantify non-factorization effects and compare theoretical predictions for $L/K$ , $M/K$ , and $M/L$ ratios with current experimental data.

M. Cadeddu, N. Cargioli, M. Cau, F. Dordei, L. Ferro2026-08-04

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nucl-th

On the nature of fully-charmed four-quark exotic state X(6900)X(6900)X(6900) from its photoproduction off nuclei

Local Spin Polarization in Anisotropic Gubser Flow: Suppression Mechanism and Formulation Dependence

Nuclei with enhanced Schiff moments in practical elements for atomic and molecular EDM measurements

Neutron-rich nuclei and neutron skins from chiral low-resolution interactions

Medium modifications of 1P1P1P-wave charmonia χcJ(1P)χ_{cJ}(1P)χcJ​(1P) in cold nuclear matter

Observable Signatures of a Quarkyonic Phase in Neutron Stars

Analysis of M1M1M1 capture in the α(d,γ)6α(d,γ)^6α(d,γ)6Li reaction

The Role of Ab Initio Beta-Decay Calculations in Light Nuclei for Probes of Physics Beyond the Standard Model

Astrophysical S-factor Calculation for p-p Fusion Reaction

Testing Lepton Wave Function Factorization in 71Ge^{71}\text{Ge}71Ge Electron Capture

On the nature of fully-charmed four-quark exotic state $X(6900)$ from its photoproduction off nuclei

Medium modifications of $1P$ -wave charmonia $χ_{cJ}(1P)$ in cold nuclear matter

Analysis of $M1$ capture in the $α(d,γ)^6$ Li reaction

Testing Lepton Wave Function Factorization in $^{71}\text{Ge}$ Electron Capture