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  • Collective impact of higher-order deformations of target nuclei on the fusion dynamics of heavy-ion induced reactions
    2025, 49(6): 064110-064110-12. doi: 10.1088/1674-1137/adbace
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    Several studies on fusion reaction dynamics focused on the impact of quadrupole $\beta_2^{\pm}$ deformation. However, existing literature highlights the importance of the octupole $\beta_3^{\pm}$ and hexadecapole $\beta_4^{\pm}$ deformations associated with both the projectile and target nuclei. However, the collective influence of these deformations ($\beta_2$, $\beta_3$, and $\beta_4$) on the fusion reaction dynamics has not been examined explicitly. In this study, we investigated the collective influence of higher-order deformations up to $\beta_4$ on the barrier characteristics, in particular $V_B$, $R_B$, and $\hbar\omega$, and their impact on the fusion cross-sections of heavy-ion induced reactions in the mass range $163\leq{ {A}}\leq182$. The reactions were examined at both compact and elongated configurations of the deformed nuclei. Heavy ion-induced reactions, which consist of target nuclei with higher-order deformations up to $\beta_4$, reveal a notable alteration in the barrier characteristics $V_B$ and $R_B$, along with a significant change in orientation $\theta_i$ for both compact and elongated configurations. In addition, the incorporation of deformations up to $\beta_4$ and their corresponding orientations $\theta_i$ contributes to enhanced capture cross-sections $\sigma_{cap}$ as well as integrated cross-sections $\sigma_{int.}$, resulting in better agreement with experimental data for $^{16}{\rm{O}}$-induced reactions with $^{148}{\rm{Nd}}$, $^{149-150}{\rm{Sm}}$, and $^{32}{\rm{S}}$-induced reactions with $^{150}{\rm{Sm}}$. We conclude that the incorporation of deformations of all orders up to $\beta_4$ at their optimized compact and elongated configurations is essential because it provides better outcomes compared to the optimized configurations of $\beta_2$ and $\beta_3$ deformed nuclei.
  • Strong decays of the fully charmed tetraquark states with explicit P-waves via QCD sum rules
    2025, 49(6): 063108-063108-10. doi: 10.1088/1674-1137/adc081
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    We introduce a relative P-wave to construct the doubly charmed diquark $ (\widetilde{V}) $ vector. Therefore, scalar and tensor four-quark currents were constructed to investigate the decay widths of the fully charmed tetraquark states with $ J^{PC}=0^{++} $, $ 1^{+-} $ and $ 2^{++} $ via quantum chromodynamics (QCD) sum rules. We observed that the total width of the ground state $ \widetilde{V}\overline{\widetilde{V}} $-type scalar tetraquark state is compatible with that of the $ X(6552) $ within uncertainties, and the branching ratios are quite different from that of the first radial excitation of the $ A\bar{A} $-type scalar tetraquark state. Other predictions can be verified in future experiments to shed light on the nature of the fully charmed tetraquark states.
  • Electron-ion collision spectroscopy at the CRYRING@ESR electron cooler
    2025, 49(6): 064001-064001-9. doi: 10.1088/1674-1137/adbf81
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    Electron-ion collision spectroscopy at heavy-ion storage rings aims at precision measurements of resonance features that occur in the cross sections of electron collision processes such as electron-impact ionization of ions or electron-ion recombination. As part of the international Facility for Antiproton and Ion Research (FAIR) project, the low-energy ion storage ring CRYRING@ESR has been coupled with the heavy-ion accelerators operated by the GSI Helmholtz Center for Heavy-Ion Research in Darmstadt, Germany. This has created a new opportunity for stringent strong field quantum electrodynamics tests through electron-ion collision spectroscopy of heavy few-electron ions. The present contribution provides details of the electron-ion collision spectroscopy setup at CRYRING@ESR and associated data-analysis procedures along with first results for nonresonant and resonant recombination of berylliumlike lead ions. A recombination rate enhancement factor of 3.5 was observed for nonresonant recombination at zero electron-ion collision energy. For resonant recombination excellent agreement with recent theoretical results was obtained when these were shifted by 340 meV in energy.
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ISSN 1674-1137 CN 11-5641/O4

Original research articles, Ietters and reviews Covering theory and experiments in the fieids of

  • Particle physics
  • Nuclear physics
  • Particle and nuclear astrophysics
  • Cosmology
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