Fri·Aug 2, 2024Friday·August 2, 2024

1. 01*

   The art of modeling nuclear reactions with weakly bound nuclei: status and perspectives

   A.M. Moro🇪🇸 · J. Casal🇮🇹 · M. Gomez-Ramos🇪🇸

   We give an overview of the theoretical description of nuclear reactions involving weakly-bound nuclei. Some of the more widespread reaction formalisms employed in the analysis of these reactions are briefly introduced, including various recent developments. We put special emphasis on the continuum-discretized coupled-channel (CDCC) method and its extensions to incorporate core and target excitations as well as its application to three-body projectiles. The role of the continuum for one-nucleon transfer reactions is also discussed. The problem of the evaluation of inclusive breakup cross sections is addressed within the Ichimura-Austern-Vincent (IAV) model. Other methods, such as those based on a semiclasical description of the scattering process, are also briefly introduced and some of their applications are discussed and a brief discussion on topics of current interest, such as nucleon-nucleon correlations, uncertainty evaluation and non-locality is presented.

   ↳ nucl-thnucl-exEPJA(2025)·11 citations
2. 02*

   An alternative way to decipher the nature of the doubly charmed tetraquark $T_{cc}(3875{)}^{+}$: its antiparticle $T_{\bar{c}\bar{c}}(3875{)}^{-}$ photoproduction off nuclei near threshold

   E. Ya. Paryev🇷🇺

   We study the inclusive photoproduction of $T_{\bar{c}\bar{c}}(3875{)}^{-}$ mesons (which are the antiparticles of the doubly charmed tetraquarks $T_{cc}(3875{)}^{+}$ discovered recently by the LHCb Collaboration) from nuclei in the near-threshold energy region within the nuclear spectral function approach by considering incoherent direct ($\gamma p(n)\to D^{+}(D^0)T_{\bar{c}\bar{c}}(3875{)}^{-}{\Lambda }_c^{+}$) photon--nucleon $T_{\bar{c}\bar{c}}(3875{)}^{-}$ creation processes as well as five possible different scenarios for their internal structure with the main goal of clarifying the possibility to decipher this structure (and, hence, that of $T_{cc}(3875{)}^{+}$) in photoproduction via integral and differential observables. We calculate the absolute and relative excitation functions for $T_{\bar{c}\bar{c}}(3875{)}^{-}$ production off ${}^{12}$C and ${}^{184}$W target nuclei at near-threshold photon beam energies of 30--38 GeV, the absolute differential cross sections for their production off these target nuclei at laboratory polar angles of 0${}^{\circ }$--10${}^{\circ }$ as well as the A and momentum dependences of the relative (transparency ratios) cross sections for $T_{\bar{c}\bar{c}}(3875{)}^{-}$ production at photon energy of 35 GeV within the adopted scenarios for the $T_{\bar{c}\bar{c}}(3875{)}^{-}$ meson intrinsic structure. We demonstrate that the absolute and relative observables considered show a certain sensitivity to these scenarios. Therefore, the measurement of such observables in future experiments at the proposed high-luminosity electron-ion colliders EIC and EicC in the US and China in the near-threshold energy region might shed light on the $T_{cc}(3875{)}^{+}$ internal structure.

   ↳ hep-phhep-exnucl-exnucl-thInt.J.Mod.Phys.A(2024)·3 citations
3. 03*

   Pairing phase transition in the odd-A nuclei: identification and classification

   Yumeng Wang🇨🇳 · Yuhang Gao🇯🇵 · Lang Liu

   The investigation into the pairing phase transition in the odd-A nucleus 161Dy utilizes a sophisticated blend of covariant density functional theory and the shell-model-like approach. It is discerned that variations in thermodynamic quantities at the critical temperature do not exclusively align with pairing phase transitions. The presence of an S-shaped heat capacity curve, often interpreted as an indication of such transitions, does not offer a definitive confirmation. Additional factors, including the blocking effect, can modify the heat capacity curve and impede the transition process. The pairing phase transition in 161Dy, occurring around 0.7 to 1.0 MeV, is unequivocally characterized as a first-order transition. Furthermore, an exploration into the impact of varying strengths of pairing correlations on these transitions reveals a nonlinear relationship, adding complexity to the transition dynamics.

   ↳ nucl-thnucl-exCPC(2024)·2 citations
4. 04*

   Subspace-projected multireference covariant density functional theory

   X. Zhang🇨🇳 · C. C. Wang🇨🇳 · C. R. Ding🇨🇳 · J. M. Yao🇨🇳

   Multireference density functional theory (MR-DFT) has been a pivotal method for studying nuclear low-lying states and neutrinoless double-beta ($0\nu \beta \beta$) decay. However, quantifying their theoretical uncertainties has been a significant challenge due to the computational demands. This study introduces a subspace-projected covariant density functional theory (SP-CDFT), which efficiently emulates MR-CDFT calculations for nuclear low-lying states. This approach leverages the eigenvector continuation method combined with the quantum-number projected generator coordinate method, based on a relativistic energy density functional (EDF). We apply SP-CDFT to investigate the correlations among the physical quantities of nuclear matter, nuclear low-lying spectroscopy, and the nuclear matrix elements (NMEs) of $0\nu \beta \beta$ decay in the two heaviest candidate nuclei. Our findings reveal generally strong correlations between the NMEs of $0\nu \beta \beta$ decay and the excitation energy of the $2_1^{+}$ state, as well as the $E2$ transition strength, although these correlations vary significantly among nuclei. This work also paves the way for refining nuclear EDF parameters using spectroscopic data.

   ↳ nucl-thcond-mat.str-elhep-phnucl-exPRC(2025)·10 citations

* 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.