Nuclear Theory·nucl-th

Thursday·October 31, 2024

10 papers—4 primary·6 cross-listed

01
Exploring the $ϕ - α$ interaction via femtoscopic study
Faisal Etminan🇮🇷
Very recently the Wood-Saxon (WS) type interaction in the single-folding potential approach are constructed to simulate the $ϕ - α$ potentials. One set of the $ϕ - α$ potentials are based on the first principle HAL QCD $ϕ - N$ interactions in $^{4} S_{3/2}$ channel, and in another set, the $ϕ$ -meson-nucleus potentials were calculated by employing the quark-meson coupling (QMC) model. By utilizing these two set of $ϕ - α$ potentials, the two-particle momentum correlation of $ϕ - α$ in high-energy heavy ion collisions is explored. The numerical results show that the correlation functions at small source size (high density nuclear medium) depends on the employed potential model. Also, the correlation functions are obtained within the Lednicky-Lyuboshits (LL) formalism. For small source size, it is found that, the LL formula returns significantly different values due to the large interaction range of the $ϕ - α$ potential.
nucl-thhep-phPLB(2025)·11 citations
02
Evolution of strangeness and hyperons in quarkyonic matter
Yuki Fujimoto🇺🇸 · Toru Kojo🇯🇵 · Larry McLerran🇺🇸
We study the evolution of matter composition from nuclear to quark densities in the confining regime, by extending an ideal model of Quarkyonic matter, IdylliQ model, to multi-flavor systems including strangeness. The model provides a dual description of quark and baryon occupation probabilities which are determined by minimizing the energy of the system. Saturation of low-momentum quark states drives the formation of quark matter and constrains baryon distributions, inducing statistical repulsion among baryon species. Applying the model to charge-neutral matter composed of neutrons, $Λ_{0}$ , and $Σ_{0}$ hyperons, we find that, for typical size of baryons, $d$ -quark saturation occurs before hyperons appear, delaying their onset and shifting the threshold density from $\sim 2$ -- $3 n_{sat}$ to $\sim 5$ -- $6 n_{sat}$ ( $n_{sat} \approx 0.16 f m^{- 3}$ : nuclear saturation density). After hyperons emerge, low-momentum hyperon states remain only sparsely occupied due to the quark saturation. These features mitigate the hyperon puzzle, in which the appearance of hyperons softens neutron star equations of state significantly by increasing energy density with little pressure increase. Our results highlight the key role of quark saturation in dense baryonic matter and provide new insights into the interplay between quark dynamics and hyperon physics in neutron stars.
nucl-thastro-ph.HEhep-phPRC(2026)·30 citations
03
Possibility of quantum Hall effect in dense quark matter environments: A chiral model approach
Dani Rose J Marattukalam🇮🇳 · Ashutosh Dwibedi🇮🇳 · Sourodeep De🇮🇳 · Sabyasachi Ghosh🇮🇳
A high baryon density and strong magnetic fields are expected in peripheral collisions in heavy ion collision experiments, such as the upcoming CBM experiment at FAIR in Germany and NICA in Russia. Such densities are also likely in the core of massive neutron stars, possibly with mixed quark-hadron phases. We employed the chiral effective model to obtain the constituent quark mass in this non-perturbative QCD regime. A quantized version of conductivity and resistivity is found reliable in the quantum domain of low density and high magnetic fields. Landau quantization gives rise to phenomena similar to SdH oscillations and quantum Hall effect in this regime. We have used a density-dependent magnetic field to observe SdH-type oscillations and the possibility of the quantum Hall effect in the interior of neutron stars where the magnetic field varies as a function of the baryon density. Our results indicate the possibility of observing the quantum Hall effect in a neutron star environment.
nucl-thastro-ph.HEhep-phhep-thPRD(2025)·3 citations
04
Ab initio nuclear shape coexistence and emergence of island of inversion around $N = 20$
E. F. Zhou · C. R. Ding · J. M. Yao · B. Bally · H. Hergert · C. F. Jiao · T. R. Rodríguez
We extend a nuclear ab initio framework based on chiral two- and three-nucleon interactions to investigate shape coexistence and the degradation of the $N = 20$ magic number in both even-even and odd-even magnesium isotopes. The quantum-number projected generator coordinate method, combined with the in-medium similarity renormalization group (IMSRG), is employed to compute their low-lying states. This approach reasonably reproduces the coexistence of weakly and strongly deformed states at comparable energies, and allows us to track the emergence of the $N = 20$ island of inversion through the continuous IMSRG evolution of the chiral Hamiltonian. Our results indicate that the ground state of $^{33}$ Mg with spin-parity $3/ 2^{-}$ is predominantly a strongly deformed configuration with $K^{π} = 3/ 2^{-}$ , while the lowest $7/ 2^{-}$ state is predicted to be a shape isomer, consisting of a mixture of weakly deformed configurations with different $K$ values. The results highlight the essential roles of both dynamical and static collective correlations in reproducing the ordering of nuclear states with distinct shapes.
nucl-thnucl-exPLB(2025)·15 citations

Affiliations

first authorsco-authorsvia INSPIRE

Exploring the ϕ-α interaction via femtoscopic study

Evolution of strangeness and hyperons in quarkyonic matter

Possibility of quantum Hall effect in dense quark matter environments: A chiral model approach

Ab initio nuclear shape coexistence and emergence of island of inversion around N=20

Affiliations

Exploring the $ϕ - α$ interaction via femtoscopic study

Ab initio nuclear shape coexistence and emergence of island of inversion around $N = 20$