Nuclear Theory·nucl-th

Thursday·March 12, 2026

11 papers—4 primary·7 cross-listed

01
Insensitivity of the Coulomb breakup of halo nuclei to spectroscopic factors
Live-Palm Kubushishi · Pierre Capel
Exotic nuclear structures such as halos are mostly studied using reactions. In Coulomb breakup, the radioactive projectile dissociates through its interaction with a heavy target. Often, a spectroscopic factor for the core-halo structure is inferred from experimental data. In this work, we present a new calculation of the Coulomb breakup of the one-neutron halo nucleus $^{11}$ Be performed with a coupled-channel effective particle-rotor model of that nucleus, which accounts for the excitation of the $^{10}$ Be core. Changes in the spectroscopic factor have no effect on the cross sections when the asymptotic normalisation coefficient is fixed, hence confirming the insensitivity of Coulomb-breakup cross sections to spectroscopic factors.
nucl-thPLB(2026)·1 citation
02
Systematic study of superheavy nuclei within a microscopic collective Hamiltonian: Impact of quantum shape fluctuations
X. Q. Yang · R. Y. Hu · R. N. Mao · J. Xiang · Z. P. Li
The even-even superheavy nuclei with $104 ⩽ Z ⩽ 126$ and $N ⩽ 258$ have been investigated using a microscopic five-dimensional collective Hamiltonian (5DCH) based on constrained triaxial relativistic Hartree-Bogoliubov calculations with the PC-PK1 density functional. The 5DCH approach effectively captures the characteristic of isospin dependence of nuclear binding energies, two-nucleon separation energies, and $α$ -decay energies across isotopic chains and demonstrates consistent accuracy as $Z$ increases, underscoring the model's predictive power. The collective potentials, average quadrupole deformations, and characteristic collective observables: $E (2_{1}^{+})$ , $R_{42}$ , and $B (E 2; 2_{1}^{+} \to 0_{1}^{+})$ reveal a shape transition from well-prolate deformation around $N = 150$ and $N = 210$ to medium-deformed $γ$ -soft shape around $N = 176$ and $N = 246$ , and finally to a spherical shape near $N = 184$ and $N = 258$ for the isotopic chains with $104 ⩽ Z ⩽ 118$ . Oblate deformations are favored for $Z ⩾ 120$ isotopes around $N = 178$ . Remarkably, for a substantial range of transitional superheavy nuclei with $N ≳ 184$ and $N ≳ 240$ , no $0^{+}$ states bounded by the fission saddles are predicted within their very shallow potential wells due to quantum shape fluctuations (QSFs). Additionally, sharp variations predicted for two-neutron separation energies $S_{2 n}$ and $α$ -decay energies $Q_{α}$ at $N = 184$ and $258$ in mean-field calculations are significantly reduced and shifted to $N = 182$ and $256$ in the 5DCH calculations, which is caused by the rapid evolution of the dynamical correlation energies related to QSFs around the nuclear spherical shells.
nucl-thPLB(2026)·0 citations
03
Finite-Size Scaling of Net-Proton Cumulants in Heavy-Ion Collisions: Remarks on the Interpretation of a Recent Analysis
Roy A. Lacey (Department of Chemistry, Stony Brook University, Stony Brook, NY, USA)🇺🇸
Finite-size scaling (FSS) provides a framework for investigating the possible presence of a critical end point (CEP) in the QCD phase diagram using fluctuation observables measured in relativistic heavy-ion collisions. A recent analysis reported a finite-size scaling representation of a susceptibility constructed from net-proton cumulants and interpreted the resulting scaling behavior as evidence for a CEP near $μ_{B} \approx 625$ MeV \cite{FSSpaper}. This note examines several aspects of that scaling construction. These include identifying the pseudorapidity acceptance window with the physical system size used in the finite-size scaling relations, assessing the influence of acceptance-driven multiplicity scaling on the susceptibility used for the scaling analysis, and treating thermodynamic scaling fields in the scaling variable. These considerations clarify several issues relevant for the consistent implementation and interpretation of finite-size scaling analyses in heavy-ion collision experiments. Taken together, they indicate that the reported scaling behavior does not uniquely establish critical dynamics nor the presence of a CEP near $μ_{B} \approx 625$ MeV.
nucl-thhep-exhep-thnucl-ex1 citation
04
Radiative corrections to elastic electron-carbon scattering cross sections in comparison with experiment
D.H.Jakubassa-Amundsen🇩🇪
The influence of dispersion on the differential scattering cross section in the vicinity of the first diffraction minimum is revisited for collision energies between 200 and 450 MeV. Transient nuclear excitations in the giant resonance region with angular momentum L \leq 3 are taken into consideration within updated numerics. Moreover, the deviations of the nonperturbative QED corrections from the conventionally used smooth Born predictions are accounted for. A qualitative agreement with the measurements is only obtained for the lowest energy, while dispersion within the present model is too small at the higher energies.
nucl-th0 citations

Affiliations

first authorsco-authorsvia INSPIRE

Insensitivity of the Coulomb breakup of halo nuclei to spectroscopic factors

Systematic study of superheavy nuclei within a microscopic collective Hamiltonian: Impact of quantum shape fluctuations

Finite-Size Scaling of Net-Proton Cumulants in Heavy-Ion Collisions: Remarks on the Interpretation of a Recent Analysis

Radiative corrections to elastic electron-carbon scattering cross sections in comparison with experiment

Affiliations