Wed·May 29, 2024Wednesday·May 29, 2024

1. 01*

   Data-driven background model for the CUORE experiment

   CUORE Collaboration: D. Q. Adams🇺🇸 · C. Alduino🇺🇸 · K. Alfonso🇺🇸 · F. T. Avignone III🇺🇸 · O. Azzolini🇮🇹 · G. Bari🇮🇹 · F. Bellini🇮🇹 · G. Benato🇮🇹 · M. Beretta🇺🇸 · M. Biassoni🇮🇹 · A. Branca🇮🇹 · C. Brofferio🇮🇹 and 105 other authors

   We present the model we developed to reconstruct the CUORE radioactive background based on the analysis of an experimental exposure of 1038.4 kg yr. The data reconstruction relies on a simultaneous Bayesian fit applied to energy spectra over a broad energy range. The high granularity of the CUORE detector, together with the large exposure and extended stable operations, allow for an in-depth exploration of both spatial and time dependence of backgrounds. We achieve high sensitivity to both bulk and surface activities of the materials of the setup, detecting levels as low as 10 nBq kg${}^{-1}$ and 0.1 nBq cm${}^{-2}$, respectively. We compare the contamination levels we extract from the background model with prior radio-assay data, which informs future background risk mitigation strategies. The results of this background model play a crucial role in constructing the background budget for the CUPID experiment as it will exploit the same CUORE infrastructure.

   nucl-exastro-ph.IMphysics.ins-detPRD(2024)·27 citations
2. 02*

   $J/\psi$ photoproduction: threshold to very high energy

   Lin Tang🇨🇳 · Yi-Xuan Yang🇨🇳 · Zhu-Fang Cui🇨🇳 · Craig D. Roberts🇨🇳

   A reaction model for $\gamma +p\to J/\psi +p$ photoproduction, which exposes the $c\bar{c}$ content of the photon in making the transition $\gamma \to c\bar{c}+\mathbb{P}\to J/\psi$ and couples the intermediate $c\bar{c}$ system to the proton's valence quarks via Pomeron ($\mathbb{P}$) exchange, is used to deliver a description of available data, viz. both differential and total cross sections from near threshold, where data has newly been acquired, to invariant mass $W\approx 300$GeV. The study suggests that it is premature to link existing $\gamma +p\to J/\psi +p$ data with, for instance, in-proton gluon distributions, the quantum chromodynamics trace anomaly, or pentaquark production. Further developments in reaction theory and higher precision data are necessary before the validity of any such connections can be assessed.

   ↳ hep-phhep-exhep-latnucl-ex+1PLB(2024)·15 citations
3. 03*

   Development of a real-time beam profile monitor for GeV photons and its application in accelerator facilities

   Ryoko Kino🇯🇵 · Sho Nagao🇯🇵 · Takeru Akiyama🇯🇵 · Hiroyuki Fujioka🇯🇵 · Tomomasa Fujiwara🇯🇵 · Tatsuhiro Ishige🇯🇵 · Kosuke Itabashi🇯🇵 · Shunsuke Kajikawa🇯🇵 · Masashi Kaneta🇯🇵 · Masaya Mizuno🇯🇵 · Satoshi N. Nakamura🇯🇵 · Kotaro Nishi🇯🇵 and 6 other authors

   A real-time beam profile monitoring system is proposed for GeV photon beams at the BM4 beamline of the Mikamine site, Research Center for Accelerator and Radioisotope Science (RARiS; previously known as ELPH) at Tohoku University. This monitoring system enhances the capability to monitor the entire beamline by incorporating newly developed beam profile monitors (BPMs) for upstream and midstream sections, in addition to the existing high-speed BPM used for downstream monitoring. This paper reports on the detection mechanisms of the newly developed BPMs and the actual measurement results obtained using the integrated beam monitoring system. The new BPMs are composed of plastic scintillation fibers and silicon photomultipliers, enabling high-precision, real-time measurements. Data acquisition utilizes streaming TDC, a firmware commonly employed in the J-PARC Hadron-hall, allowing real-time detection of high-intensity photon beams with count rates reaching several tens of MHz. With sufficient statistical data, the BPM achieved a 1-s beam-profiling accuracy of 10 {\mu}m. The proposed BPM system serves as a valuable resource for future physics experiments at the BM4 photon beamline and will significantly contribute to ongoing accelerator research endeavors.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2025)·0 citations
4. 04*

   Construction of continuous collective energy landscapes for large amplitude nuclear many-body problems

   Paul Carpentier🇫🇷 · Nathalie Pillet🇫🇷 · Denis Lacroix🇫🇷 · Noel Dubray🇫🇷 · David Regnier🇫🇷

   Several protocols are proposed to build continuous energy surfaces of many-body quantum systems, regarding both energy and states. The standard variational principle is augmented with constraints on state overlap, ensuring arbitrary precision on continuity. As an illustration, the lowest energy and excited state paths relevant for the ${}^{240}$Pu asymmetric fission are studied. The scission is clearly signed, with a neutron excess in the neck, the ultimate glue before its rupture. Our approach can potentially connect any couple of Hilbert space states, which opens up new horizons for various applications.

   ↳ nucl-thnucl-exPRL(2024)·12 citations
5. 05*

   Impact of the radial profile of atomic nuclei on observables in high-energy collisions

   Zhengxi Yan🇺🇸 · Jun Xu🇨🇳 · Jiangyong Jia🇺🇸

   In heavy-ion phenomenology, the nucleon density distribution in colliding nuclei is commonly described by a two-parameter Woods-Saxon (WS) distribution. However, this approach overlooks the detailed radial structure in the density distribution that arises from the quantal filling patterns of neutrons and protons. These fine structures, as estimated by the Skyrme-Hartree-Fock density functional, cause slight deviations in heavy-ion observables from the WS baseline, which cannot be captured by simply readjusting the WS parameters. These deviations depend on centrality and observable but often exhibit similar shapes for different nuclei. To fully exploit the exceptional sensitivity of isobar collisions to nuclear structure, such fine structures should be considered.

   ↳ nucl-thhep-phnucl-exPRC(2024)·1 citation
6. 06*

   Neutron Data Evaluation of 243Am

   V.M Maslov · V.G. Pronyaev🇦🇹 · N.A. Tetereva · K.I. Zolotarev

   The diverse measured data base of n+243Am was evaluated using a statistical theory and genera-lized least squares codes. Consistent description of total, capture and fission measured data provides an important constraint for the inelastic scattering cross section. Important constraints for the measured capture cross section in the 0.15-300 keV energy range come from the average radiative and neutron S0 and S1 strength functions. The evaluated inelastic cross sections of available evaluations are in severe disagreement, predicted change of the inelastic cross section shape at En ~1.5 MeV is attributed to the sharp increase of the level density of the residual odd-even nuclide 241Am due to the onset of three-quasi-particle excitations. The influence of exclusive (n, xnf) pre-fission neutrons on prompt fission neutron spectra (PFNS) and (n, xn) spectra is modelled. Contributions of emissive/non-emissive fission and exclusive spectra of (n, xnf) reactions are defined by a consistent description of the 241Am(n, F), 241Am(n, 2n). Data file is at https://www-nds.iaea.org/minskact/data/original/za095243

   ↳ nucl-thnucl-ex0 citations
7. 07*

   Ab-initio electroweak corrections to superallowed $\beta$ decays and their impact on $V_{ud}$

   Vincenzo Cirigliano🇺🇸 · Wouter Dekens🇺🇸 · Jordy de Vries🇳🇱 · Stefano Gandolfi🇺🇸 · Martin Hoferichter🇨🇭 · Emanuele Mereghetti🇺🇸

   Radiative corrections are essential for an accurate determination of $V_{ud}$ from superallowed $\beta$ decays. In view of recent progress in the single-nucleon sector, the uncertainty is dominated by the theoretical description of nucleus-dependent effects, limiting the precision that can currently be achieved for $V_{ud}$. In this work, we provide a detailed account of the electroweak corrections to superallowed $\beta$ decays in effective field theory (EFT), including the power counting, potential and ultrasoft contributions, and factorization in the decay rate. We present a first numerical evaluation of the dominant corrections in light nuclei based on Quantum Monte Carlo methods, confirming the expectations from the EFT power counting. Finally, we discuss strategies how to extract from data the low-energy constants that parameterize short-distance contributions and whose values are not predicted by the EFT. Combined with advances in ab-initio nuclear-structure calculations, this EFT framework allows one to systematically address the dominant uncertainty in $V_{ud}$, as illustrated in detail for the ${}^{14}$O $\to$ ${}^{14}$N transition.

   ↳ nucl-thhep-exhep-lathep-ph+1PRC(2024)·42 citations
8. 08*

   Radiative corrections to superallowed $\beta$ decays in effective field theory

   Vincenzo Cirigliano🇺🇸 · Wouter Dekens🇺🇸 · Jordy de Vries🇳🇱 · Stefano Gandolfi🇺🇸 · Martin Hoferichter🇨🇭 · Emanuele Mereghetti🇺🇸

   The accuracy of $V_{ud}$ determinations from superallowed $\beta$ decays critically hinges on control over radiative corrections. Recently, substantial progress has been made on the single-nucleon, universal corrections, while nucleus-dependent effects, typically parameterized by a quantity ${\delta }_{\text{NS}}$, are much less well constrained. Here, we lay out a program to evaluate this correction from effective field theory (EFT), highlighting the dominant terms as predicted by the EFT power counting. Moreover, we compare the results to a dispersive representation of ${\delta }_{\text{NS}}$ and show that the expected momentum scaling applies even in the case of low-lying intermediate states. Our EFT framework paves the way towards ab-initio calculations of ${\delta }_{\text{NS}}$ and thereby addresses the dominant uncertainty in $V_{ud}$.

   ↳ hep-phhep-exhep-latnucl-ex+1PRL(2024)·42 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.