Fri·Nov 28, 2025Friday·November 28, 2025

1. 01*

   Wavelet analysis of monopole strength in highly deformed ${}^{24}$Mg

   A. Bahini🇿🇦 · V. O. Nesterenko🇷🇺 · P. von Neumann-Cosel🇩🇪 · P.-G. Reinhard🇩🇪 · J. Carter🇿🇦 · N. A. Ashurko🇷🇺 · R. Neveling🇿🇦 · A. Repko🇸🇰 · I. T. Usman🇿🇦

   Experimental data on $\alpha$-particle inelastic scattering for monopole excitations in ${}^{24}$Mg in the excitation-energy region $E_{\mathrm{x}}$$=$$9$$-$$25$ MeV, obtained at the iThemba Laboratory for Accelerator Based Sciences (iThemba LABS), have been analyzed within a fully self-consistent quasiparticle random-phase approximation (QRPA) framework using two Skyrme parametrizations. A good overall agreement with the experimental data is achieved, particularly with the SkP${}^{\delta }$ force, which corresponds to a low nuclear incompressibility of $K_{\infty }$$=$$202$ MeV. Extraction of energy scales, by means of wavelet analysis, characterizing the observed fine structure of the isoscalar giant monopole resonance (ISGMR) as well as the low-energy region $10$$-$$18$ MeV of the deformation-induced monopole-quadrupole coupling (MQC) in order to investigate the damping mechanism contributing to their decay widths. Characteristic energy scales are extracted from the fine structure using continuous wavelet transforms. The experimental results are compared to QRPA calculations employing the Skyrme parameterizations SkP${}^{\delta }$ and SVbas. A significant, if not decisive, impact of the MQC strength on the wavelet power spectra is observed across the entire excitation-energy range of $10$$-$$24$ MeV. Wavelet features derived from the QRPA and from unperturbed two-quasiparticle (2qp) monopole strengths are compared. The results demonstrate that the residual interaction plays a key role in reproducing realistic wavelet powers and characteristic energy scales. Overall, a continuous range of scales $\delta E$$=$$200$$-$$1000$ keV is obtained rather than distinct isolated scales. The deformation softness of ${}^{24}$Mg is found to significantly influence both the monopole strength distribution and the wavelet characteristics.

   nucl-exnucl-thPRC(2026)·0 citations
2. 02*

   Does the suppression shown at LHC in O-O collisions follow the systematics obtained for A-A collisions ?

   M.Petrovici🇷🇴 · A.Pop🇷🇴

   In this paper we present to what extent recent experimental results obtained for ${\pi }^0$ suppression in O-O collisions at $\sqrt{s_{NN}}$=5.36 TeV fit into the systematics for much heavier systems. The systematics with which the comparison is made was published a few years ago \cite{Pet_1} in terms of charged particles suppression $R_{AA}$ as a function of $⟨N_{part}⟩$ and $⟨d{N}_{ch}/d\eta ⟩$. The values of $R_{AA}$ at $⟨d{N}_{ch}/d\eta ⟩$ and $⟨N_{part}⟩$ experimentally measured and estimated by Glauber MC, respectively, for O-O collisions are in good agreement with the systematics obtained for A-A collisions.

   nucl-exnucl-th0 citations
3. 03*

   Influence of ${}^{13}$C on proton-induced ${}^{13}$N production from natural carbon target

   Tomasz Matulewicz🇵🇱 · Izabela Skwira-Chalot🇵🇱

   Two recent measurements of ${}^{12}$C(p,$\gamma$)${}^{13}$N reaction on natural carbon were performed by detecting ${\beta }^{+}$ decay of ${}^{13}$N residue. It is argued that the measurements at energies above the ${}^{13}$C(p,n)${}^{13}$N reaction threshold of 3.24 MeV proton kinetic energy can be interpreted as a consequence of 1.06\% admixture of ${}^{13}$C isotope in natural carbon, as the cross section for ${}^{13}$N production raised by 3 orders of magnitude with respect to the measurements of ${}^{12}$C(p,$\gamma$)${}^{13}$N at lower energies.

   nucl-exActa Phys.Polon.B(2025)·0 citations
4. 04*

   Topological production of charmonia with event-shape engineering in $pp$ collisions at $\sqrt{s}=13$ TeV using PYTHIA8

   Aswathy Menon Kavumpadikkal Radhakrishnan🇮🇳 · Suraj Prasad🇮🇳 · Neelkamal Mallick🇮🇳 · Raghunath Sahoo🇮🇳

   The production of heavy quarks (charm and beauty) in high-energy hadronic and nuclear collisions provides an excellent testing ground for the theory of strong interactions and validates models based on quantum chromodynamics (QCD). In this work, prompt and nonprompt production of $J/\psi$ in $pp$ collisions at $\sqrt{s}=13$ TeV are studied as a function of transverse spherocity using PYTHIA8. $J/\psi$ is reconstructed via its electromagnetic decay to dielectrons and dimuons, in mid- and forward-rapidity, respectively. Transverse spherocity, an event shape observable, is used to distinguish hard QCD events from the softer, isotropic ones. In PYTHIA8, the production of $J/\psi$ can be influenced by the average number of multiple parton interactions ($⟨N_{\mathrm{mpi}}⟩$), owing to the underlying events (UE), which have a dominant contribution to particle production at lower transverse momentum. Since transverse spherocity is correlated to $⟨N_{\mathrm{mpi}}⟩$, this can serve as an experimentally accessible tool for event selection to study the underlying QCD processes influencing the prompt and nonprompt $J/\psi$ production. This study reveals the correlation between heavy-flavor production dynamics and topological event selection in $pp$ collisions using PYTHIA8, whose relevance awaits experimental validation.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2026)·1 citation
5. 05*

   Characterizing the Neutron Skin of ${}^{48}$Ca Through Collective Flow at the CERN Large Hadron Collider

   Andreas Vitsos · Leonora Misciattelli Mocenigo Soranzo · You Zhou

   The recently developed ``imaging-by-smashing" technique has emerged as a powerful approach to connect final-state collective flow phenomena in ultra-relativistic nuclear collisions with the intrinsic structure of the colliding nuclei. While most efforts have focused on constraining nuclear shape properties such as deformation and triaxiality, less attention has been given to the neutron skin, primarily in heavy nuclei such as ${}^{208}$Pb. In this work, a novel study of the neutron-skin thickness in ${}^{48}$Ca is presented, based on comparative analyses of ${}^{48}$Ca+${}^{48}$Ca and ${}^{40}$Ca+${}^{40}$Ca collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV. Simulations within the AMPT framework are employed to investigate the impact of varying neutron-skin thicknesses $\Delta r_{np}$ for ${}^{48}$Ca on collective flow observables, including anisotropic flow coefficients and mean transverse momentum ($[p_{\mathrm{T}}]$) fluctuations. The triangular flow $v_3$, quadrangular flow $v_4$, as well as the variance and skewness of $[p_{\mathrm{T}}]$ fluctuations, display notable sensitivity to $\Delta r_{np}$. These findings indicate that calcium-isotope runs at the LHC could provide an independent and complementary approach to constraining $\Delta r_{np}$, with the potential to help resolve the current tension between PREX and CREX measurements.

   ↳ nucl-thnucl-exEPJC(2026)·1 citation

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.