Tue·Sep 30, 2025Tuesday·September 30, 2025

1. 01*

   Study of the interaction between $\Xi$ baryons and light mesons via femtoscopy at the LHC

   ALICE Collaboration

   Meson-baryon systems with strangeness content provide a unique laboratory for investigating the strong interaction and testing theoretical models of hadron structure and dynamics. In this work, the measured correlation functions for oppositely charged $\Xi -\mathrm{K}$ and $\Xi -\pi$ pairs obtained in high-multiplicity pp collisions at $\sqrt{s}=13$ TeV at the LHC are presented. For the first time, high-precision data on the $\Xi -\mathrm{K}$ interaction are delivered at small relative momenta. The scattering lengths, extracted via the Lednický-Lyuboshits expression of the pair wavefunction, indicate a repulsive and a shallow attractive strong interaction for the $\Xi -\mathrm{K}$ and $\Xi -\pi$ systems, respectively. The $\Xi (1620)$ and $\Xi (1690)$ states are observed in the $\Xi -\pi$ correlation function and their properties, mass and width, are determined. These measurements are in agreement with other available results. Such high-precision data can help refine the understanding of these resonant states, provide stronger constraints for chirally motivated potentials, and address the key challenge of describing the coupled-channel dynamics that may give rise to molecular configurations.

   nucl-exhep-exPLB(2026)·3 citations
2. 02*

   Overview on Efforts for a Second Detector at the Electron-Ion Collider (EIC)

   Jihee Kim🇺🇸

   The Electron-Ion Collider (EIC) will provide a unique experimental platform to explore the properties of gluons in nucleons and nuclei, offering new insights into their structure and dynamics. The EIC community has outlined a detailed physics program and the demanding detector requirements in a comprehensive detailed document. The primary general-purpose detector, ePIC, is designed to support a broad range of physics studies. However, there is strong community support for a second detector at the EIC to further enhance the scientific capabilities of the facility. A second detector would provide cross-checks and systematic controls for potential discoveries, while incorporating complementary technologies to address physics measurements that may be underrepresented by ePIC. In particular, it would improve forward detector acceptance at low transverse momentum ($p_T$) and enable more precise measurements in exclusive, diffractive, and tagging physics. This talk will provide a general overview of the second detector and outline its potential capabilities, highlighting key areas of the physics program it could enhance.

   nucl-exhep-exPoS(2025)·1 citation
3. 03*

   Decay study of the most neutron-deficient Zn isotopes with the Warsaw Optical TPC detector

   A. Kubiela🇵🇱 · D.-S. Ahn🇯🇵 · H. Baba🇯🇵 · A. Bezbakh · A.A. Ciemny🇵🇱 · W. Dominik🇵🇱 · N. Fukuda🇯🇵 · A. Giska🇵🇱 · R. Grzywacz🇺🇸 · V. Guadilla🇪🇸 · Y. Ichikawa · Z. Janas🇵🇱 and 24 other authors

   Results of decay studies of nuclei in the vicinity of 54Zn, which is the most neutron-deficient isotope of zinc and undergoes ground-state two-proton radioactivity (2p), are presented. The measurements were performed with a gaseous time projection chamber with optical readout which allowed us to record tracks of protons emitted in the decays. A new method of data analysis was used to reconstruct energies and emission angles of low-energy protons that were stopped within the active volume of the chamber. Half-lives and branching ratios for \b{eta}-delayed proton emission channels were determined for 56Zn, 55Zn, and 55Cu. The \b{eta}-delayed emission of two protons for 55Zn was observed for the first time. Five events of 2p radioactivity of 54Zn were detected and reconstructed. The distribution of the opening angle between momenta of the two protons is consistent with the findings published in [Ascher et al. PRL 107, 102502 (2011)]. The combination of all results suggests a flat angular distribution, in contrast to the one measured for 45Fe.

   nucl-exPRC(2026)·1 citation
4. 04*

   Ab initio study of island of inversion in odd-$A$ nuclei: Structure of ${}^{31,33}$Mg

   Subhrajit Sahoo🇮🇳 · Praveen C. Srivastava🇮🇳

   We study the $N=20$ island of inversion region in the odd-$A$ Ne and Mg isotopes from the fundamental nuclear forces based on chiral two- and three-nucleon potentials. The state-of-the-art \textit{ab initio} valence space in medium similarity renormalization method was used for this purpose. Our study focuses on the evolution of single-particle states and discusses their transition into the island of inversion through particle-hole excitations across the $N=20$ shell gap. The computed low-lying states and magnetic moments are in good agreement with the experimental data. We presented the rotational band structures, established via $E2$ transitions, in ${}^{31}$Mg and ${}^{33}$Mg, which emerge from both normal and intruder configurations at low excitation energies. Our results suggest the presence of weak, moderate, and strongly prolate-deformed configurations at low energy in both isotopes. The present work offers valuable insights into the configurations and shapes of low-lying states in nuclei within the island of inversion, enhancing our understanding of the structures of exotic nuclei from first principles.

   ↳ nucl-thnucl-exPRC(2025)·5 citations
5. 05*

   Resonance Contributions to Radiative Corrections in Charged-Current Elastic (Anti)Neutrino-Nucleon Scattering at GeV Energies

   Oleksandr Tomalak🇨🇳

   We present the first evaluation of virtual resonance contributions to the charged-current (anti)neutrino-nucleon elastic scattering at GeV energies, focusing on the dominant $\Delta (1232)$ resonance. We approximate the vector part of the $N\to \Delta$ transition by the leading magnetic dipole term. Our results for the cross-section corrections at fixed neutrino energy indicate the permille-level contribution of resonance intermediate states to the elastic and radiative scattering cross sections. This calculation exhibits the expected infrared behavior of the invariant amplitudes and unpolarized cross sections. Our findings provide important insights into inelastic excitations in the charged-current (anti)neutrino-nucleon elastic scattering at GeV energies.

   ↳ hep-phnucl-exnucl-thPLB(2026)·2 citations
6. 06*

   Uncertainties with low-resolution nuclear forces

   Tom Plies🇩🇪 · Matthias Heinz🇺🇸 · Achim Schwenk🇩🇪

   Low-resolution nuclear Hamiltonians, obtained from chiral effective field theory (EFT) and softened using renormalization group techniques, have been very successful in nuclear structure theory. The associated EFT truncation uncertainty for these potentials is difficult to quantify. We use singular value decompositions of low-resolution nuclear forces to obtain an operator basis to study Hamiltonian uncertainties for these potentials. We perform Bayesian inference for the singular values and three-body low-energy constants, the free parameters of nuclear Hamiltonians in our framework, using likelihoods based on nucleon-nucleon phase shifts and triton observables to account for the EFT truncation uncertainties in these quantities. Validating our inference, we find good reproduction of input uncertainties for low-energy phase shifts and three-nucleon observables. On the other hand, uncertainties for higher-energy phase shifts are systematically underestimated, which we attribute to limitations of the singular value decomposition and neglected correlations between phase shifts at different energies. We propagate the resulting distribution of Hamiltonians forward to predictions for ground-state properties of ${}^{24,28}$O and ${}^{48}$Ca, comparing against other state-of-the-art nuclear structure predictions. Our approach makes it possible to account for EFT uncertainties when using low-resolution potentials, which is important for many ongoing studies in exotic nuclei.

   ↳ nucl-thnucl-exPRC(2026)·6 citations
7. 07*

   Precision calculation of ${}^3$He$(\alpha ,\gamma {)}^7$Be for solar physics

   Ratna Khadka🇺🇸 · Ling Gan🇺🇸 · Renato Higa🇺🇸 · Gautam Rupak🇺🇸

   We calculate the cross section for radiative capture ${}^3$He$(\alpha ,\gamma {)}^7$Be at next-to-next-to-leading order (NNLO). At this order of perturbation, momentum dependent two-body currents make their first appearance. We provide a model-independent construction of these currents from gauge and Galilean invariance, where the general framework for constructing higher-order two-body currents in low-energy effective field theories becomes evident. The ${}^3$He$(\alpha ,\gamma {)}^7$Be astrophysical S-factor $S_{34}(0)=0.564_{-0.015}^{+0.17}$ keV b is obtained from a Bayesian analysis at NNLO, with an additional nominal theoretical uncertainty $\pm 0.017$ keV b of 3%.

   ↳ nucl-thastro-ph.SRnucl-exPLB(2026)·1 citation
8. 08*

   New insights from the flavor dependence of quark transverse momentum distributions in the pion

   Lorenzo Rossi🇮🇹 · Alessandro Bacchetta🇮🇹 · Matteo Cerutti🇫🇷 · Marco Radici🇮🇹

   We update our previous extraction of transverse momentum distributions of unpolarized quarks in the pion by implementing a more comprehensive description of theoretical uncertainties and, for the first time, by exploring possible differences among quark flavors. We extract such distributions from all available data for unpolarized pion-nucleus Drell-Yan processes, where the cross section is differential in the transverse momentum of the final lepton pair. The cross section involves transverse momentum distributions in the nucleon, that we consistently take from our previous studies.

   ↳ hep-phhep-exnucl-exnucl-thPLB(2026)·7 citations
9. 09*

   ELIGANT-TN -- ELI Gamma Above Neutron Threshold: The Thermal Neutron setup

   P.-A. Söderström🇯🇵 · D. L. Balabanski🇷🇴 · M. Cuciuc · D. M. Filipescu · I. Gheorghe · A. Kuşoğlu🇹🇷 · C. Matei · D. Testov · S. Aogaki🇷🇴 · H. T. Aslani · L. Capponi🇬🇧 · D. Choudhury🇳🇱 and 17 other authors

   Here we present the thermal neutron counter from the ELI Gamma Above Neutron Threshold setup at the Extreme Light Infrastructure - Nuclear Physics. We describe the mechanical design of the setup, the properties of the ${}^3$He gas counters, and the hardware data-acquisition electronics and software digital signal processing. The performance of the complete detector array is demonstrated via Geant4 and MCNP simulations, and measurements with typical neutron sources. The analysis procedure for experimental measurements are outlined with a in-beam test experiment with an $\alpha$ beam to measure the ${}^{13}\mathrm{C}(\alpha ,{\mathrm{n}}_0){}^{16}\mathrm{O}$ cross-section branching ratios.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2026)·1 citation
10. 10*

    The SWEET project: probing sugar crystals for direct dark matter searches

    A. Bento🇵🇹 · F. Casadei🇩🇪 · E. Cipelli🇩🇪 · S. Di Lorenzo🇮🇹 · F. Dominsky🇩🇪 · P. V. Guillaumon🇮🇹 · D. Hauff🇩🇪 · A. Langenkaemper🇩🇪 · M. Mancuso🇩🇪 · B. Mauri🇩🇪 · C. Moore🇩🇪 · F. Petricca🇩🇪 · F. Proebst🇩🇪 · M. Zanirato🇩🇪

    Several experiments searching for direct dark matter interactions aim to achieve unprecedented sensitivity to sub-GeV/c${}^2$ dark matter masses through elastic scattering with nuclei in various target crystals at cryogenic temperatures. Hydrogen-rich materials, such as organic compounds, are promising candidates for the detection of sub-GeV/c${}^2$ dark matter due to favourable kinematics. In this paper, we present for the first time results obtained with a sugar-based phonon detector employing sucrose crystals (${\mathbf{C}}_{12}{\mathbf{H}}_{22}{\mathbf{O}}_{11}$), capable of particle detection with associated scintillation light.

    ↳ physics.ins-detnucl-ex1 citation
11. 11*

    Response of wavelength-shifting and scintillating-wavelength-shifting fibers to ionizing radiation

    W. Bae🇺🇸 · J. Cesar🇺🇸 · K. Chen🇨🇳 · J. Cho🇺🇸 · D. Du🇺🇸 · J. Edgar🇺🇸 · W. Earthman · O. M. Falana · M. Gajda🇺🇸 · C. Hurlbut · M. Jackson · K. Lang🇺🇸 and 14 other authors

    We report results of characterizing the response and light transport of wavelength-shifting (WLS) and scintillating-wavelength-shifting (Sci-WLS) fibers under irradiation by radioactive $\alpha$, $\beta$, and $\gamma$ sources. Light yield and light transmission were measured for the WLS fiber BCF-91A from Saint-Gobain and for a new Sci-WLS fiber EJ-160 from Eljen Technology. The two variants with different fluor mixtures, EJ-160I and EJ-160II, exhibited approximately five and seven times higher light yield than BCF-91A, respectively, while their attenuation lengths were 3.80\,m for BCF-91A, 4.00\,m for EJ-160I, and 2.50\,m for EJ-160II.

    ↳ physics.ins-dethep-exnucl-exJINST(2026)·2 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.