Fri·Mar 21, 2025Friday·March 21, 2025

1. 01*

   Neutrinoless $\beta \beta$ decay in the interacting boson model based on the nuclear energy density functionals

   Kosuke Nomura🇯🇵

   The neutrinoless $\beta \beta$ ($0\nu \beta \beta$) decay nuclear matrix elements (NMEs) are calculated in the interacting boson model (IBM), which is based on the nuclear energy density functional (EDF) theory. The Hamiltonian of the IBM that gives rise to the energies and wave functions of the ground and excited states of $0\nu \beta \beta$ decay emitting isotopes and corresponding final nuclei is determined by mapping the self-consistent mean-field deformation-energy surface obtained with a given EDF onto the corresponding bosonic energy surface. The transition operators are formulated using the generalized seniority scheme, and the pair structure constants are determined by the inputs provided by the self-consistent calculations. The predicted values of the $0\nu \beta \beta$-decay NMEs with the nonrelativistic and relativistic EDFs are compared with those resulting from different many-body methods. Sensitivities of the predicted NMEs to the model parameters and assumptions are discussed.

   ↳ nucl-thnucl-exPRC(2025)·3 citations
2. 02*

   Precision cross-sections for advancing cosmic-ray physics and other applications: a comprehensive programme for the next decade

   D. Maurin🇫🇷 · L. Audouin🇫🇷 · E. Berti🇮🇹 · P. Coppin🇨🇭 · M. Di Mauro🇮🇹 · P. von Doetinchem🇺🇸 · F. Donato🇮🇹 · C. Evoli🇮🇹 · Y. Génolini🇫🇷 · P. Ghosh🇺🇸 · I. Leya🇨🇭 · M. J. Losekamm🇩🇪 and 23 other authors

   Cosmic-ray physics in the GeV-to-TeV energy range has entered a precision era thanks to recent data from space-based experiments. However, the poor knowledge of nuclear reactions, in particular for the production of antimatter and secondary nuclei, limits the information that can be extracted from these data, such as source properties, transport in the Galaxy and indirect searches for particle dark matter. The Cross-Section for Cosmic Rays at CERN workshop series has addressed the challenges encountered in the interpretation of high-precision cosmic-ray data, with the goal of strengthening emergent synergies and taking advantage of the complementarity and know-how in different communities, from theoretical and experimental astroparticle physics to high-energy and nuclear physics. In this paper, we present the outcomes of the third edition of the workshop that took place in 2024. We present the current state of cosmic-ray experiments and their perspectives, and provide a detailed road map to close the most urgent gaps in cross-section data, in order to efficiently progress on many open physics cases, which are motivated in the paper. Finally, with the aim of being as exhaustive as possible, this report touches several other fields -- such as cosmogenic studies, space radiation protection and hadrontherapy -- where overlapping and specific new cross-section measurements, as well as nuclear code improvement and benchmarking efforts, are also needed. We also briefly highlight further synergies between astroparticle and high-energy physics on the question of cross-sections.

   ↳ astro-ph.HEhep-exnucl-exnucl-thPhys.Rept.(2026)·23 citations
3. 03*

   Acceptance dependence of factorial cumulants, long-range correlations, and the antiproton puzzle

   Adam Bzdak🇵🇱 · Volker Koch🇺🇸 · Volodymyr Vovchenko🇺🇸

   We analyze joint factorial cumulants of protons and antiprotons in relativistic heavy-ion collisions and point out that they obey the scaling ${\hat{C}}_{nm}^{p,\bar{p}}\propto ⟨N_p{⟩}^n⟨N_{\bar{p}}{⟩}^m$ as a function of acceptance when only long-range correlations are present in the system, such as global baryon conservation and volume fluctuations. This hypothesis can be directly tested experimentally without the need for corrections for volume fluctuations. We show that if correlations among protons and antiprotons are driven by global baryon conservation and volume fluctuations only, the equality ${\hat{C}}_2^p/⟨N_p{⟩}^2={\hat{C}}_2^{\bar{p}}/⟨N_{\bar{p}}{⟩}^2$ holds for large systems created in central collisions. We point out that the experimental data of the STAR Collaboration from phase I of RHIC beam energy scan are approximately consistent with the scaling ${\hat{C}}_{nm}^{p,\bar{p}}\propto ⟨N_p{⟩}^n⟨N_{\bar{p}}{⟩}^m$, but the normalized antiproton correlations are stronger than that of protons, $-{\hat{C}}_2^{\bar{p}}/⟨N_{\bar{p}}{⟩}^2>-{\hat{C}}_2^p/⟨N_p{⟩}^2$. Existing theoretical baselines, based on global baryon conservation and volume fluctuations, cannot explain the data, to which we refer as the antiproton puzzle. We also discuss high-order factorial cumulants which can be measured with sufficient precision within phase II of RHIC-BES.

   ↳ nucl-thhep-phnucl-exPRC(2025)·9 citations
4. 04*

   Impact of UC2, UC, UBC and UB2 target compositions on the release of fission products

   Julien Guillot · Brigitte Roussiere · Sandrine Tusseau-Nenez · Isabelle Deloncle · Martin Humenny · Matthieu Lebois · Jean-Francois Ledu · Jerome Roques · Francois Brisset

   The release properties of 4 targets (UC2, UC, UBC, UB2) were measured for 11 elements (Kr, Sr, Ru, Sn, Sb, Te, I, Cs, Ba, La, and Ce) using an off-line technique. The crystal packing fraction and the size of the studied element play a key role in the release process. However, physicochemical properties are also involved, notably melting and boiling points in vacuum and the minimal oxidation state. Principal component analysis was used to investigate the interrelationships between the physicochemical properties of fission products (from Fe to Dy) and the observed releases, thereby enabling predictions to be made about the release properties of the four crystallic configurations for elements that are inaccessible in off-line experiments.

   ↳ cond-mat.mtrl-scinucl-exNuclear Instruments and Methods in Physic…
5. 05*

   Measurement of the ${}^{40}$Ar(e,e${}^{\prime }$) elastic scattering cross section with a novel gas-jet target

   M. Littich🇩🇪 · L. Doria🇩🇪 · P. Brand🇩🇪 · P. Achenbach🇩🇪 · S. Aulenbacher🇩🇪 · S. Bacca🇩🇪 · J.C. Bernauer🇺🇸 · M. Biroth🇩🇪 · D. Bonaventura🇩🇪 · D. Bosnar🇭🇷 · M. Christmann🇩🇪 · E. Cline🇺🇸 and 26 other authors

   We report on a measurement of elastic electron scattering on argon performed with a novel cryogenic gas-jet target at the Mainz Microtron accelerator MAMI. The luminosity is estimated with the thermodynamical parameters of the target and by comparison to a calculation in distorted-wave Born approximation. The cross section, measured at new momentum transfers of 1.24 fm${}^{-1}$ and 1.55 fm${}^{-1}$ is in agreement with previous experiments performed with a traditional high-pressure gas target, as well as with modern ab-initio calculations employing state-of-the-art nuclear forces from chiral effective field theory. The nearly background-free measurement highlights the optimal properties of the gas-jet target for elements heavier than hydrogen, enabling new applications in hadron and nuclear physics.

   ↳ physics.ins-detnucl-exEPJA(2025)·0 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.