Tue·Nov 11, 2025Tuesday·November 11, 2025

1. 01*

   Experimental review on the chiral magnetic effect in relativistic heavy ion collisions

   Wei Li🇺🇸 · Qiye Shou🇨🇳 · Fuqiang Wang🇺🇸

   The chiral magnetic effect (CME) refers to a predicted phenomena in quantum chromodynamics that manifests as a charge separation along an external magnetic field, driven by an imbalance of quark chirality. Searches for the CME has been carried out by azimuthal particle correlations in relativistic heavy ion collisions where such a chirality imbalance is anticipated and a strong magnetic field is created in the initial stage. No conclusive experimental evidence on the CME has been established so far because of large background contributions to azimuthal correlation observables. We review the status of the experimental search for the CME, covering the observables used, the techniques to mitigate backgrounds, and the strengths and limitations of various experimental approaches, and outline a future prospect of the CME search in high-energy nuclear collisions.

   nucl-exhep-exhep-phnucl-thEur. Phys. J. Spec. Top. (2026)·6 citations
2. 02*

   Microscopic study of low-lying states in odd-mass nuclei for atomic electric dipole moment searches

   E. F. Zhou · J. M. Yao🇨🇳

   We present a microscopic study of the low-lying states of five odd-mass nuclei of particular interest for experimental searches of atomic electric dipole moments (EDMs): ${}^{129}$Xe, ${}^{199}$Hg, ${}^{225}$Ra, ${}^{229}$Th, and ${}^{229}$Pa. The analysis is performed within the recently developed multi-reference covariant density functional theory (MR-CDFT), which incorporates symmetry restoration and configuration mixing based on self-consistent mean-field solutions. The calculated energy spectra and electromagnetic observables of these nuclei are reasonably well reproduced without introducing any parameters beyond those of the underlying universal relativistic energy density functional. The results demonstrate the reliability of MR-CDFT in describing the structure of these nuclei and in providing essential input on nuclear Schiff moments relevant to ongoing EDM searches.

   ↳ nucl-thnucl-exphysics.atom-ph6 citations
3. 03*

   Ultracold neutron energy spectrum and storage properties from magnetically induced spin depolarization

   N. J. Ayres🇨🇭 · G. Ban🇫🇷 · G. Bison🇨🇭 · K. Bodek🇵🇱 · V. Bondar🇨🇭 · T. Bouillaud🇫🇷 · D. Bowles🇺🇸 · G. L. Caratsch🇨🇭 · E. Chanel🇨🇭 · W. Chen🇨🇭 · P.-J. Chiu🇨🇭 · C. B. Crawford🇺🇸 and 44 other authors

   We present a novel method for extracting the energy spectrum of ultracold neutrons from magnetically induced spin depolarization measurements using the n2EDM apparatus. This method is also sensitive to the storage properties of the materials used to trap ultracold neutrons, specifically, whether collisions are specular or diffuse. We highlight the sensitivity of this new technique by comparing the two different storage chambers of the n2EDM experiment. We validate the extraction by comparing to an independent measurement for how this energy spectrum is polarized through a magnetic-filter, and finally, we calculate the neutron center-of-mass offset, an important systematic effect for measurements of the neutron electric dipole moment.

   ↳ hep-exhep-phnucl-exPRL(2026)·1 citation
4. 04*

   From Commissioning to Precision Data-Taking: Resolving Operational Challenges in the Nab Detector Systems

   L. J. Broussard🇺🇸 · H. Acharya🇺🇸 · R. Alarcon🇺🇸 · S. Baeßler🇺🇸 · M. Benoit🇺🇸 · K. Borah🇺🇸 · C. L. Britton🇺🇸 · E. Brown🇺🇸 · J. Choi🇺🇸 · S. Clymer🇺🇸 · C. Crawford🇺🇸 · N. Ericson🇺🇸 and 27 other authors

   Our understanding of the weak mixing of quarks, described by the Cabibbo Kobayashi Maskawa (CKM) matrix, currently presents an anomaly. Thanks to major strides in both theory and experiment, improved precision in determinations of the first row of matrix elements has revealed disagreement with the expectation of unitarity. The Nab experiment at the Spallation Neutron Source is designed to precisely extract the first matrix element $V_{ud}$ and shed light on experimental tensions within the neutron beta decay dataset. Nab's asymmetric spectrometer allows coincident reconstruction of the decay proton and electron energies, which will be used to determine the electron-neutrino correlation coefficient, and thus (with the neutron lifetime) determine $V_{ud}$. This unique approach has provided a more comprehensive view of neutron beta decay, including a first observation of the full momentum phase space of the decay above detector thresholds and limits on exotic neutron states. Recent upgrades to the Nab detector system have improved the robustness and stability of the detector performance in terms of proton detection efficiency, noise performance, and detector segment availability, setting the stage for high precision physics data-taking.

   ↳ physics.ins-detnucl-exEPJ Web Conf.(2026)·0 citations
5. 05*

   Reference Quadrupole Moments of Transition Elements from Lamb Shifts in Muonic Atoms

   S. Rathi🇮🇱 · K. von Schoeler🇨🇭 · P. Indelicato🇫🇷 · B. Ohayon🇮🇱

   We present a novel method for accurately measuring the absolute electric quadrupole moments of light transition elements $(23\le Z\le 30)$. Our approach is based on performing precision muonic x-ray spectroscopy of the $2s-2p$ manifold, which is also referred to as the Lamb shift. These transitions are too weak to be detected with dispersive methods and too overlapping to be resolved by solid-state detectors. Here, we propose the use of cryogenic microcalorimeters, which possess high efficiency and excellent energy resolution in the relevant energy regime, coupled with state-of-the-art theoretical calculations. We demonstrate the feasibility of this approach by performing extensive calculations and realistic simulations. In this way, we establish that the uncertainty in the absolute moment, which is transferred to the quadrupole moments of all isotopes in the chain, could be reduced by up to an order of magnitude within a day of measurement. These precise reference quadrupole moments serve as valuable inputs for nuclear structure studies and for benchmarking state-of-the-art quantum chemistry calculations in open-shell elements.

   ↳ physics.atom-phnucl-exPRL(2026)·3 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.