PaperPanorama

Nuclear Experiment·nucl-ex

Wed·Jul 22, 2026

5 papers—1 primary·4 cross-listed

All5Primary1Cross-lists4
  1. 01

    Negative-parity high-spin structure of 105Pd

    B. Kruzsicz🇭🇺 · D. Sohler🇭🇺 · J. Timár🇭🇺 · I. Kuti🇭🇺 · Q. B. Chen🇨🇳 · S. Q. Zhang🇨🇳 · J. Meng🇨🇳 · P. Joshi🇬🇧 · R. Wadsworth🇬🇧 · K. Starosta🇨🇦 · A. Algora🇪🇸 · P. Bednarczyk🇵🇱 and 17 other authors

    Negative-parity medium- and high-spin structure of the nucleus 105Pd was studied through the 96Zr(13C,4n)105Pd reaction at incident energies of 51 and 58 MeV, using the EUROBALL IV gamma-ray spectrometer in conjunction with the DIAMANT charged particle array. New bands have been observed and the previously reported bands have been extended to higher energies and spins. Altogether six decoupled bands with E2 transitions and one strongly coupled band with M1 + E2 transitions have been observed. The observed energy spectra and B(M1)/B(E2) ratios are compared with results of quantum particle rotor model calculations. Based on these comparisons, quasiparticle configurations can be assigned to two newly observed decoupled bands as well as to the strongly coupled band. The previously emerged possible interpretation for the third decoupled band as a two-phonon wobbling excitation lacks support. The observations indicate possible gamma-band nature for this band. The strongly coupled band, consistently with the absence of another observed strongly coupled band in this experiment, does not exhibit chirality.

    nucl-exPRC(2025)·1 citation
  2. 02

    Ultra-peripheral Collisions

    Jesus Guillermo Contreras🇨🇿 · Spencer Robert Klein🇺🇸

    Photons in ultra-peripheral collisions of heavy ions (and protons) can be used for a variety of physics purposes - for studies of nuclear structure at low Bjorken, as probes of beyond-standard-model physics at the highest possible photon energies, and to explore new regimes of quantum mechanics via interferometry between two photon sources that share no common origin. This review will present the origins of photons in ultra-peripheral collisions and discuss the important physics that is being done with these photons, with particular emphasis on those on the energy frontier for photon physics.

    ↳ hep-exhep-phnucl-exnucl-th0 citations
  3. 03

    Nonlinear collective flow reveals the breakdown of quadrupole--hexadecapole scaling in heavy ion collisions

    Hadi Mehrabpour🇨🇳 · Zahra Sheibani🇮🇷 · Li Yan🇨🇳 · Chunjian Zhang🇨🇳 · Abolfazl Mirjalili🇮🇷

    Determining the role of intrinsic hexadecapole deformation () in nuclear structure remains a long-standing challenge. Relativistic heavy-ion collisions provide a unique opportunity to address this problem by converting the initial nuclear geometry into the collective motion of the quark--gluon plasma (QGP). Using event-by-event viscous hydrodynamic simulations of ultra-central U+U collisions at GeV, we investigate whether higher-order collective flow can isolate the contribution of and test the correlation. We demonstrate that information carried by the sign of survives the QGP evolution and is enhanced through nonlinear hydrodynamic response: the fourth-order flow harmonic acquires its topology dependence predominantly from the linear response, whereas the sensitivity of the sixth-order harmonic originates almost entirely from nonlinear mode coupling. As a consequence, the nonlinear response coefficient cleanly separates the intrinsic nuclear topologies. These results establish the sign of as an experimentally accessible signature of deviations from the quadrupole--hexadecapole correlation, demonstrating that higher-order collective flow provides a direct probe of nuclear multipole structure while revealing how nonlinear QGP dynamics encode subtle higher-order geometric information into final-state observables.

    ↳ nucl-thhep-exhep-phnucl-ex1 citation
  4. 04

    Quarkyonic Stars with Strangeness

    Jin-Biao Hu🇳🇱 · Jun-Ting Ye🇨🇳 · Si-Pei Wang🇳🇱 · Rui Wang🇳🇱 · Zhen Zhang🇳🇱 · Lie-Wen Chen🇨🇳

    We propose an extension of the quarkyonic matter framework that includes , , and quarks and the full baryon octet. Within this extended framework, we impose beta-equilibrium between baryons and leptons, while determining the quark fractions from the constituent quark contents of baryons. The hadronic sector of octet baryons is described by a recently developed density, momentum and isospin dependent effective interaction based on the N3LO Skyrme pseudopotential, whereas quarks and leptons are treated as free particles. We find that the quarkyonic mechanism can obviously reduce the critical density for hyperon appearance in neutron stars due to the fact that the nucleons are displaced to higher momentum states in quarkyonic matter and their chemical potentials rise accordingly. Furthermore, the quarkyonic mechanism can significantly stiffen the equation of state of hyperon star matter and thereby enhance the hyperon star maximum mass, thus helping to mitigate the hyperon puzzle.

    ↳ nucl-thastro-ph.HEhep-phnucl-ex0 citations
  5. 05

    Temperature fluctuations in a realistic Polyakov-loop extended Nambu--Jona-Lasinio Model along the freeze-out line

    He Liu🇨🇳 · Peng Wu🇨🇳 · Hong-Ming Liu🇨🇳 · Peng-Cheng Chu🇨🇳

    We extend and reparameterize the Polyakov--Nambu--Jona-Lasinio (PNJL) model to reproduce lattice simulation data at zero baryon chemical potential and to position its critical endpoint (CEP) within the BES-II experimental energy range. Using this realistic PNJL model, we investigate the behavior of the second-order temperature cumulant along the freeze-out line, aiming to understand the non-monotonic energy dependence of the two-particle transverse momentum correlation observed by the STAR Collaboration. Our results show a distinct dip structure in near the CEP and the first-order phase boundary on the phase diagram. Along the experimentally extracted freeze-out line, the dip minimum occurs around 7.7 GeV, and its trend is consistent with that observed by STAR, suggesting that the non-monotonic dependence of may be related to the CEP. Our results also indicate that cumulant ratios such as or eliminate the influence of initial volume fluctuations and may better reveal the underlying critical fluctuations. Further verification could be pursued through hydrodynamic or transport simulations that incorporate critical dynamics. These results and predictions might provide an a priori theoretical basis for future experimental measurements of higher-order event-mean transverse momentum fluctuations.

    ↳ nucl-thnucl-ex0 citations

Affiliations

first authorsco-authorsvia INSPIRE