PaperPanorama

Nuclear Experiment·nucl-ex

Mon·Sep 14, 2026

6 papers—1 primary·5 cross-listed

All6Primary1Cross-lists5
  1. 01

    Results on U(n,f) isotopic fission yields using prompt and delayed gamma rays at the FIPPS spectrometer of the ILL

    T. Materna · P. Herran · M. Ballu · Q. Poirier · A. Letourneau · D. Doré · L. Thulliez · C. Michelagnoli · F. Kandzia · Y. H. Kim · U. Köster · O. Litaize · O. Sérot · A. Chebboubi

    We present preliminary results from a measurement campaign conducted with the FIPPS -ray spectrometer at the ILL using an active target made of U dissolved in a liquid scintillator. Prompt rays were used to extract absolute, independent isotopic fission yields. We obtained yields for a selected set of well-produced even-even nuclei from the U(n,f) reaction and compared them with JEFF-3.3 evaluated data. This included the doubly magic nucleus Sn, for which we observed a pronounced deficit (about a factor 7) with respect to JEFF-3.3. Using the FIFRELIN fission fragment de-excitation code, we interpreted this discrepancy as evidence that Sn is mainly produced in its ground state at scission or after neutron evaporation. Delayed rays recorded in the same experiment were also analysed. No deviation was found in the beta decay of Sn compared to the nuclear database. However, an excess of about a 40% was found in the decay of Kr, which may originate from an overestimated ground-state feeding of Rb in the evaluated data.

    nucl-ex
  2. 02

    Radiative corrections to weak interaction processes

    Chien-Yeah Seng

    The search for physics beyond the Standard Model in low-energy weak interaction processes requires a precise knowledge of the Standard Model background at tree- and loop-level. In many such cases, radiative corrections represent one of the major sources of theory uncertainty due to the non-perturbative structures of nucleon or nuclei. In this review, I discuss several modern strategies based on dispersion relation, lattice gauge theory and nuclear many-body calculations to pin down the hadronic and nuclear uncertainties in the radiative corrections to low-energy weak interaction processes such as beta decays and parity-violating electron-nucleus scattering.

    ↳ hep-phhep-exhep-latnucl-ex+1
  3. 03

    Tensor-polarized twist-3 distribution function of spin-1 deuteron

    S. Kumano · Kenshi Kuroki

    We investigate the twist-2 and twist-3 tensor-polarized partonic structures of the spin-1 deuteron. Using the operator product expansion with local operators, we derive a Wandzura-Wilczek (WW)-like twist-2 relation between the tensor-polarized twist-2 quark distribution and the twist-3 distribution , together with a Burkhardt-Cottingham (BC)-like sum rule. The local-operator formalism makes the Lorentz structure and rotational invariance manifest and provides useful constraints on the twist-3 sector. We then use a phenomenological parametrization of the twist-2 distribution , constrained by HERMES data on the deuteron structure function at , to quantitatively estimate the twist-3 distribution within the WW approximation. The resulting has a shape and magnitude comparable to those of , indicating that subleading-twist effects may be relevant for future experiments at relatively low . In this contribution, we summarize the theoretical derivation of the WW-like relation and BC-like sum rule and present a phenomenological estimate of the tensor-polarized twist-3 quark distribution in the deuteron.

    ↳ hep-phhep-exhep-latnucl-ex+1
  4. 04

    Quantum convolutional neural network for predicting nuclear charge radii

    Jinzhe Wu · Jianping Zhao · Tianshuai Shang · Yanhua Lu · Yundong Wang · Jian Li · Haozhao Liang

    Quantum machine learning has the potential to become a new tool for understanding complex nuclear structures. In this work, we apply a hybrid quantum convolutional neural network (QCNN) to nuclear charge-radius prediction for the first time, aiming to explore the feasibility of quantum machine learning in nuclear-physics data analysis. Based on a classical convolutional neural network (CNN) framework, a small variational quantum convolutional filter is introduced as a quantum feature map to extract local correlations on the nuclear chart. The QCNN shows promising predictive accuracy and training stability, and provides a reliable description of the charge-radius evolution along several representative isotopic chains. These results support further investigation of quantum convolutional architectures for nuclear-structure data analysis.

    ↳ nucl-thnucl-ex
  5. 05

    An integrated readout system for parallel-plate avalanche counter and multi-wire drift chamber at HIAF-HIRIBL

    E. Q. Liu · T. S. Huang · Z. X. Ma · Z. P. Sun · L. Li · H. J. Ong · H. Wang · S. Terashima · L. M Duan · H. R Yang · Y. Qian · F. S. Shi and 5 other authors

    A newly developed, highly-integrated multi-channel front-end readout system -- FEAM-256 -- is presented for use with position-sensitive gaseous detectors, including parallel-plate avalanche counters (PPACs) and multi-wire drift chambers (MWDCs). The system's position resolution was characterized using both an source and cosmic-ray muons. Intrinsic position resolutions of 320 m for the PPAC, and 424 m for the MWDC were achieved. Designed specifically for integration into the data-acquisition infrastructure at the High-Rigidity radioactive Ion Beam Line (HIRIBL) of China's High Intensity heavy-ion Accelerator Facility (HIAF), FEAM-256 enables seamless incorporation of PPAC and MWDC detectors into the HIRIBL experimental setup.

    ↳ physics.ins-detnucl-ex
  6. 06

    Microscopic description of spin distributions in multinucleon tranfer reactions

    Kotaro Koga · Kazuyuki Sekizawa

    Background: The generation of spin distributions in fission fragments has attracted substantial interest in recent years and its mechanism is becoming clear alongside the refined description with microscopic theories. In contrast, the microscopic origin of spin distributions in reaction products remain largely unexplored. Methods: Three-dimensional TDHF calculations are performed for multinucleon transfer processes in the reaction at using the Skyrme SLy5 energy density functional. To obtain spin distributions in each transfer channel, the particle-number projection (PNP) and the angular-momentum projection (AMP) are simultaneously achieved for a reaction product. Results: By performing PNP+AMP for TDHF wave functions after collisions, spin-dependent transfer cross sections are calculated for projectile-like fragments (PLFs). From the results, we find that abundant spin distributions can be obtained from the TDHF wave functions. For one-nucleon addition and removal channels, the calculated spin values agree well with those of single-particle states in the - and -shell, respectively. Moreover, for a-few-nucleon transfer channels, we show that the obtained spin distributions can be well explained by combinations of total angular momenta of those single-particle states. Furthermore, as the number of transferred nucleons increases, we find that the calculated spin distributions exhibit a smooth singly-peaked shape with a long tail as a function of , which resembles that of empirical spin distributions for thermally equilibrated fragments. An exploratory calculation for induced fission of Pu is also carried out, obtaining similar results as in multinucleon transfer reactions. (shorted due to the arXiv's word limit)

    ↳ nucl-thnucl-ex