Nuclear Theory·nucl-th

Wednesday·March 5, 2025

6 papers—2 primary·4 cross-listed

01
Particle number projection on a spatial domain
L.M. Robledo
The formalism of particle number on a spatial domain for mean field wave functions with pairing is revisited to account for the case where finite dimensional basis are used. The formulas differ from the ones previously used in the literature. It is shown that the present formalism has the right limit in the well known case of zero pairing whereas the other formalism do not satisfy this basic requirement. By using a simple one-dimensional model we illustrate the differences in the results for particle number distribution probability obtained with the two methods.
nucl-thPRC(2026)·3 citations
02
Super-enhanced Nuclear Fusion in Metal-like Systems and in Condensed Plasmas of Supernova Progenitors
Hidetsugu Ikegami
In the scheme of chemonuclear reaction, bulk of itinerant s-electrons revealing the thermodynamical liquid activity in metallic systems undergo contact interaction with atomic nuclei and therein nucleons, inducing contagiously thermodynamical liquid activity among the bulk of nuclei under the irreversible action of Nature towards the chemical potential minimum resulting in the united spontaneous, irreversible atomic and nuclear reactions. The chemonuclear reaction, moreover, is enhanced with astronomical figures besides the enhancement of few particle processes (e.g., in the electron-screened pycnonuclear fusion). In the systems of metal-like hydride/deuteride and electron donor mixtures, self-sustained H-H and D-D chemonuclear fusion may take place. In these systems, however, some unforeseen phenomena are induced, e.g., radiation-less fusion and $γ$ -ray missing positron annihilation.
nucl-th0 citations
03
Molecular 9Be+p Fusion Reaction
Johann Rafelski🇺🇸 · Berndt Müller🇺🇸
We study (nuclear) fusion reactions in Beryllium. We argue that some are nuclear long-distance molecular processes of interest for low energy nuclear reactions. For these we develop a novel reaction model. We note a chain of reactions that can naturally arise in Beryllium target created by nonequilibrium proton reactions.
↳ physics.app-phnucl-thEur.Phys.J.ST(2025)·0 citations
04
Momentum Flow Mechanisms and Color-Lorentz Forces on Quarks in the Nucleon
Xiangdong Ji🇺🇸 · Chen Yang🇺🇸
Momentum conservation in the nucleon is examined in terms of continuous flow of the momentum current density (or in short, momentum flow), which receives contributions from both kinetic motion and interacting forces involving quarks and gluons. While quarks conduct momentum flow through their kinetic motion and the gluon scalar (anomaly) contributes via pure interactions, the gluon stress tensor has both effects. The quarks momentum flow encodes the information of the color-Lorentz force density on them, and the momentum conservation allows to trace its origin to the gluon tensor and anomaly (a ``negative pressure'' potential). From the state-of-the-art lattice calculations and experimental fits on the form factors of the QCD energy-momentum tensor, we exhibit pictures of the momentum flow and the color-Lorentz forces on the quarks in the nucleon. In particular, the anomaly contributes a critical attractive force with a strength similar to that of a heavy-quark confinement potential.
↳ hep-phhep-latnucl-exnucl-thResearch(2026)·23 citations
05
Comprehensive analysis of the $γ p \to K^{+} Σ^{0} (1385)$ , $γ n \to K^{+} Σ^{-} (1385)$ , and $π^{+} p \to K^{+} Σ^{+} (1385)$ reactions
Ai-Chao Wang🇨🇳 · Neng-Chang Wei🇨🇳 · Fei Huang🇨🇳
A comprehensive analysis of all available data on cross sections and spin-dependent observables for the $γ p \to K^{+} Σ^{0} (1385)$ , $γ n \to K^{+} Σ^{-} (1385)$ , and $π^{+} p \to K^{+} Σ^{+} (1385)$ reactions is performed within an effective Lagrangian framework. In addition to the $s$ -channel $N$ exchange, $t$ -channel $K$ and $K^{*}$ exchanges, $u$ -channel $Λ$ , $Σ$ , and $Σ^{*}$ exchanges, and the interaction current, the $s$ -channel contributions from a minimal set of $N$ and $Δ$ resonances are included in constructing the reaction amplitudes to describe the data. The analysis reveals that all available data for both photon- and hadron-induced $K Σ (1385)$ production reactions can be simultaneously and satisfactorily reproduced when the contribution of the $s$ -channel $Δ (1930) 5/2^{-}$ resonance is taken into account. The reaction mechanisms, particularly the resonance contributions in each considered reaction, are thoroughly analyzed and discussed in detail.
↳ hep-phnucl-thPRD(2025)·3 citations
06
The Electron-Ion Collider as A Prospective Facility for Pentaquark Measurements
In Woo Park🇰🇷 · Sungtae Cho🇰🇷 · Yongsun Kim🇰🇷 · Su Houng Lee🇰🇷
The Electron-Ion Collider provides a groundbreaking opportunity to study heavy pentaquarks with unprecedented precision, leveraging its high collision energy and beam spin polarization capabilities. As a representative case, we analyze electroproduction cross sections of Pc (4312) under different spin-parity hypotheses using the vector meson dominance model. To ensure a parameter-free approach and minimize ambiguity, we incorporate results from the LHCb and GlueX experiments. To characterize the spin and the parity of Pc (4312), we propose measuring the beam spin asymmetry and decay kinematic polarization, quantities that can be accurately determined by the ePIC detector. Our approach can be extended to investigate other heavy pentaquarks produced in electron-proton and electron-deuteron collisions, as well as to study their interactions with nuclear matter in electron-heavy ion collisions. We strongly encourage the EIC community to explore this potential and integrate pentaquark studies as a critical element of the scientific mission.
↳ hep-phnucl-exnucl-th0 citations

Affiliations

first authorsco-authorsvia INSPIRE

Particle number projection on a spatial domain

Super-enhanced Nuclear Fusion in Metal-like Systems and in Condensed Plasmas of Supernova Progenitors

Molecular 9Be+p Fusion Reaction

Momentum Flow Mechanisms and Color-Lorentz Forces on Quarks in the Nucleon

Comprehensive analysis of the γp→K+Σ0(1385), γn→K+Σ−(1385), and π+p→K+Σ+(1385) reactions

The Electron-Ion Collider as A Prospective Facility for Pentaquark Measurements

Affiliations

Comprehensive analysis of the $γ p \to K^{+} Σ^{0} (1385)$ , $γ n \to K^{+} Σ^{-} (1385)$ , and $π^{+} p \to K^{+} Σ^{+} (1385)$ reactions