PaperPanorama

Nuclear Experiment·nucl-ex

Fri·Oct 2, 2026

4 papers—1 primary·3 cross-listed

All4Primary1Cross-lists3
  1. 01

    Thick-target Yield of Cu(Ga Near Threshold and Implications for Nuclear Medicine, Deep Underground Detector Backgrounds, and Nucleosynthesis

    Zach Meisel · Gula Hamad · Kristyn Brandenburg · Carl R. Brune · Don E. Carter · Joseph Derkin · Yenuel Jones-Alberty · Tom N. Massey · Doug Soltesz · Shiv K. Subedi · Alexander V. Voinov

    We report thick target yields of from energies 6.5--8~MeV measured via neutron-counting at the Edwards Accelerator Laboratory at Ohio University. Our results agree with prior results based on single-foil irradiations, while disagreeing with thick-target yields inferred from stacked-foil irradiations by up to an order of magnitude. Based on comparisons of our and prior measurements to Hauser-Feshbach calculations, we estimate the thick-target yield for from =14~MeV impinging on 100\%-enriched copper () is 161~MBq/Ah (for He), which is in agreement with the current IAEA estimate of 156~MBq/Ah. At 8~MeV, where radioimpurity-free production of could be realized with a natural copper target, our yield estimate is nearly 4 lower than the IAEA estimate. We find that the cross section estimates presently employed for neutrino and dark matter detector backgrounds and the astrophysical reaction rate recently recommended for nucleosynthesis calculations are in agreement with our measurement results.

    nucl-ex
  2. 02

    Full-event anomaly detection for new physics searches at the Electron-Ion Collider

    Dimitrios Athanasakos · Sebastian Grieninger · Hongkai Liu · Tymothy Mangan · Felix Ringer · Robert Szafron

    The future Electron-Ion Collider (EIC) will offer new opportunities to search for physics beyond the Standard Model. We study resonant anomaly detection using machine learning and the full particle content of an event. We consider a new neutral gauge boson and a heavy neutral lepton as illustrative signals with different electron-jet topologies. Weakly supervised learning uses this event information to enhance the sensitivity of an invariant-mass search without identifying individual signal events during training. Comparisons with high-level observables show that the electron kinematics account for an important part of the separation, while correlations among the particles provide further sensitivity. We also construct a conditional full-event generator by adapting a model pretrained on LHC jets to produce EIC background events. A scan over signal fractions demonstrates substantial signal enhancement using the learned background reference, providing a proof of concept for this approach at the EIC. Finally, we consider a fully unsupervised graph autoencoder that provides modest signal enhancement but retains sensitivity at signal fractions too small for effective weak supervision. Our results motivate full-event anomaly detection as part of the EIC physics program and identify directions for developing methods suited to its distinct kinematics.

    ↳ hep-phhep-exnucl-exnucl-th+1
  3. 03

    The JO&Minna Framework: A Method to Interpret Depth Profiles of Activation

    Edil Mustafin

    A novel analytical framework, designated as the JO\&Minna method, is presented for interpreting the depth profiles of residual activation induced by heavy-ion beams in thick structural materials. By combining the limiting fragmentation and factorization principles, the JO-factor formalism rigorously links the spatial distribution of projectile-like fragments to the range derivatives and electronic stopping powers. Furthermore, the Minna procedure establishes a mathematical link via profile differentiation and convolution analysis to reconstruct the original energy spectrum and energy spread of the fragments from the measured activity profiles. The methodology is benchmarked using experimental data for production from irradiation in aluminum, demonstrating a reliable and straightforward approach for extracting fragment production kinematics and energy distributions in accelerator materials research.

    ↳ physics.acc-phnucl-ex
  4. 04

    Confronting dynamics with kaonic atom measurements within a novel unitary framework

    Albert Feijoo · Àngels Ramos · Juan Torres-Rincon

    We study the low-energy interaction of negative kaons with deuterons using chiral interaction models (OR and BCN) as input. The three-body amplitude is constructed within the Fixed-Center Approximation to the Faddeev equations, where the unitary constraints missing in the conventional approach are formally implemented with the incorporation of coherent multiple-scattering processes. The unitary procedure is extended to coupled channels including charge-exchange processes, as well as isospin-breaking effects through the use of physical particle masses. This provides a consistent description of the low-energy amplitude and allows for the determination of the scattering length and the effective range. The resulting framework is then used to assess the compatibility of the BCN interaction model with the recent SIDDHARTA-2 measurements of kaonic hydrogen and kaonic deuterium through a bootstrap analysis. The procedure leads to a readjustment of the BCN parameterization which produces visible effects in several isospin-sensitive scattering observables, hence highlighting the additional information provided by the new kaonic-atom measurements to better constrain the poorly known isovector component of the interaction.

    ↳ hep-phhep-exnucl-exnucl-th