Wed·May 17, 2023Wednesday·May 17, 2023

1. 01*

   Final results from the CUPID-Mo $0\nu \beta \beta$ experiment

   Toby Dixon🇫🇷

   CUPID-Mo is a demonstrator experiment for the next generation $0\nu \beta \beta$ experiment CUPID. It consisted of an array of 20 Lithium Molybdate (LMO) cryogenic calorimeters with 20 Ge LDs for a dual readout of heat and light. In this proceeding, we describe the final results of CUPID-Mo. We show CUPID-Mo reached performances compatible with or close to the CUPID goals. We describe the new limits on double beta decays to both ground and excited states. In addition, we present the results of a detailed background model of the experimental data, leading to a measurement of the lowest ever background index for a bolometric $0\nu \beta \beta$ experiment.

   nucl-ex0 citations
2. 02*

   Measurement of Spin-Density Matrix Elements in $\rho (770)$ Production with a Linearly Polarized Photon Beam at $E_{\gamma }=8.2-8.8\text{GeV}$

   GlueX Collaboration: S. Adhikari🇦🇲 · F. Afzal🇩🇪 · C. S. Akondi🇺🇸 · M. Albrecht🇺🇸 · M. Amaryan🇺🇸 · V. Arroyave🇺🇸 · A. Asaturyan🇦🇲 · A. Austregesilo🇺🇸 · Z. Baldwin🇺🇸 · F. Barbosa🇺🇸 · J. Barlow🇺🇸 · E. Barriga🇺🇸 and 140 other authors

   The GlueX experiment at Jefferson Lab studies photoproduction of mesons using linearly polarized $8.5\text{GeV}$ photons impinging on a hydrogen target which is contained within a detector with near-complete coverage for charged and neutral particles. We present measurements of spin-density matrix elements for the photoproduction of the vector meson $\rho$(770). The statistical precision achieved exceeds that of previous experiments for polarized photoproduction in this energy range by orders of magnitude. We confirm a high degree of $s$-channel helicity conservation at small squared four-momentum transfer $t$ and are able to extract the $t$-dependence of natural and unnatural-parity exchange contributions to the production process in detail. We confirm the dominance of natural-parity exchange over the full $t$ range. We also find that helicity amplitudes in which the helicity of the incident photon and the photoproduced $\rho (770)$ differ by two units are negligible for $-t<0.5{\text{GeV}}^2/c^2$.

   nucl-exhep-exPRC(2023)·27 citations
3. 03*

   Scientific Opportunities at the ARIEL Electron Linac

   Jan Bernauer🇺🇸 · Ross Corliss🇺🇸 · Susan Gardner🇺🇸 · Michael Hasinoff🇨🇦 · Rituparna Kanungo🇨🇦 · Jeffery Martin🇨🇦 · Richard Milner🇺🇸 · Katherine Pachal🇨🇦 · Toshimi Suda🇯🇵 · Stanley Yen🇨🇦

   This paper gives an overview of the scientific opportunities at the ARIEL electron accelerator identified in open discussion at the workshop, including applications in hadron structure, astrophysical processes, tests of quantum electrodynamics, dark matter and other BSM physics, and material science.

   nucl-exJ.Phys.Conf.Ser.(2022)·1 citation
4. 04*

   Demonstration of neutrinoless double beta decay searches in gaseous xenon with NEXT

   NEXT Collaboration: P. Novella🇪🇸 · M. Sorel🇪🇸 · A. Usón🇪🇸 · C. Adams🇺🇸 · H. Almazán🇬🇧 · V. Álvarez🇪🇸 · B. Aparicio🇪🇸 · A.I. Aranburu🇪🇸 · L. Arazi🇮🇱 · I.J. Arnquist🇺🇸 · F. Auria-Luna🇪🇸 · S. Ayet🇩🇪 and 102 other authors

   The NEXT experiment aims at the sensitive search of the neutrinoless double beta decay in ${}^{136}$Xe, using high-pressure gas electroluminescent time projection chambers. The NEXT-White detector is the first radiopure demonstrator of this technology, operated in the Laboratorio Subterráneo de Canfranc. Achieving an energy resolution of 1% FWHM at 2.6 MeV and further background rejection by means of the topology of the reconstructed tracks, NEXT-White has been exploited beyond its original goals in order to perform a neutrinoless double beta decay search. The analysis considers the combination of 271.6 days of ${}^{136}$Xe-enriched data and 208.9 days of ${}^{136}$Xe-depleted data. A detailed background modeling and measurement has been developed, ensuring the time stability of the radiogenic and cosmogenic contributions across both data samples. Limits to the neutrinoless mode are obtained in two alternative analyses: a background-model-dependent approach and a novel direct background-subtraction technique, offering results with small dependence on the background model assumptions. With a fiducial mass of only 3.50$\pm$0.01 kg of ${}^{136}$Xe-enriched xenon, 90% C.L. lower limits to the neutrinoless double beta decay are found in the T${}_{1/2}^{0\nu }>5.5\times 10^{23}-1.3\times 10^{24}$ yr range, depending on the method. The presented techniques stand as a proof-of-concept for the searches to be implemented with larger NEXT detectors.

   nucl-exhep-exphysics.ins-detJHEP(2023)·48 citations
5. 05*

   Global spin alignment of vector mesons and strong force fields in heavy- ion collisions

   Jinhui Chen🇨🇳 · Zuo-Tang Liang🇨🇳 · Yu-Gang Ma🇨🇳 · Qun Wang🇨🇳

   A perspective for the Global spin alignment of vector mesons and strong force fields in heavy-ion collisions is provided in this short report.

   ↳ nucl-thhep-phnucl-exSci.Bull.(2023)·42 citations
6. 06*

   Statistical approach of nuclear multifragmentation with realistic nuclear equation of state

   S. Mallik🇮🇳

   In this work, Canonical Thermodynamical model for nuclear multifragmentation has been updated with realistic nuclear equation of state. Mass distribution, intermediate mass fragment multiplicity as well as isospin sensitive observables have been investigated with semi-microscopic approach of determining nuclear binding and excitation energies. Production of neutron rich isotopes as well as isoscaling and isobaric yield ratio parameters have been significantly modified due to inclusion of this realistic nuclear equation of state.

   ↳ nucl-thnucl-exPRC(2023)·4 citations
7. 07*

   Ultrastable optical, XUV and soft-x-ray clock transitions in open-shell highly charged ions

   Chunhai Lyu🇩🇪 · Christoph H. Keitel🇩🇪 · Zoltán Harman🇩🇪

   Highly charged ions (HCIs) are insensitive to external perturbations and are attractive for the development of ultrastable clocks. However, only a few HCI candidates are known to provide optical clock transitions. In this Letter, we show that, as a result of strong relativistic effects, there are more than 100 suitable optical HCI clock candidates in more than 70 elements. Their transitions are embedded in the fine-structure splitting of the $n{d}^4$, $n{d}^5$ and $n{d}^6$ ground-state configurations with $n=3,4,5$ being the principal quantum numbers. The corresponding high multipolarity transitions in these ions have lifetimes and quality factors many orders of magnitude longer and larger, respectively, than those in state-of-the-art clocks. Their polarizabilities are also orders of magnitude smaller, rendering them more stable against external electromagnetic fields. Furthermore, within the same electronic configurations, the clock transitions in heavy ions scale up to the XUV and soft-x-ray region, thus enable the development of clocks based on shorter wavelengths. The existence of multiple clock transitions in different charge states of a single element, as well as in a whole isoelectronic sequence, would significantly enrich the detection of fine-structure constant variations, the search for new physics and the test of nuclear theories via high-precision spectroscopy.

   ↳ physics.atom-phnucl-exnucl-thphysics.opticsCommun.Phys.(2025)·13 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.