PaperPanorama

Nuclear Experiment·nucl-ex

Wed·Jul 29, 2026

6 papers—1 primary·5 cross-listed

All6Primary1Cross-lists5
  1. 01

    Laser Spectroscopy of Thulium Isotopes Near the (N=82) Shell Closure: Nuclear Moment and Charge Radius of

    Jana Weyrich🇩🇪 · Kenneth van Beek🇩🇪 · Harshitbabu XXX🇧🇪 · Aayush Arya🇩🇪 · Sebastian Berndt🇩🇪 · Michael Block🇩🇪 · Alexandre Brizard🇫🇷 · Premaditya Chhetri🇩🇪 · Arno Claessens🇧🇪 · Christoph Emanuel Düllmann🇩🇪 · Rafael Ferrer🇧🇪 · Sarina Geldhof🇫🇷 and 24 other authors

    We report on resonance ionization laser spectroscopy measurements performed on both neutron-deficient and neutron-rich thulium () isotopes. Isotope shifts were determined for three atomic ground-state transitions at wavelengths of , , and in the isotopes , , , and . In addition, for the transition, measurements were extended to the isotope , and the hyperfine structure was partially resolved for all five isotopes. From the extracted hyperfine coupling constants, the nuclear magnetic dipole moment for , was determined. Furthermore, the measured isotope shifts enabled the extraction of the change in the mean-square nuclear charge radius for .

    nucl-ex1 citation
  2. 02

    Demonstration of 255-kV high-voltage generation with a Cavallo multiplier system

    S. M. Clayton🇺🇸 · T. M. Ito🇺🇸 · A. Jacobs🇨🇦 · A-T. Le · M. F. Makela🇺🇸 · C. M. O'Shaughnessy🇺🇸 · N. S. Phan🇺🇸 · E. Renner · T. A. Sandborn🇺🇸 · T. J. Schaub🇺🇸 · I. L. Smythe🇺🇸 · J. Surbrook🇺🇸 · M. A. Blatnik🇺🇸 · B. W. Filippone🇺🇸

    Many cryogenic precision measurements require large electric fields in environments where conventional high-voltage feedthroughs are impractical. To address this, we developed a Cavallo electrostatic multiplier designed for in situ high-voltage generation under such conditions. Here, we report a room-temperature demonstration of this device. Using a mechanically translated transfer electrode and a custom rotary field mill for noncontact voltage measurement, the system reached output voltages up to approximately from a DC-biased input voltage in approximately of SF. The charging curves are quantitatively described by a capacitance-based model once realistic electrode misalignment is included. Voltage-hold measurements show picoampere-scale leakage currents on long time scales, whereas operation near the maximum voltage is limited by transient discharge processes associated with electrode surface condition and local field enhancement, rather than by the intrinsic dielectric strength of the gas. These results demonstrate the Cavallo multiplier as a viable low-current, in situ high-voltage source and indicate that electrode surface preparation, alignment tolerances, and insulation performance are the principal requirements for reliable operation in future cryogenic implementations.

    ↳ physics.ins-dethep-exnucl-ex0 citations
  3. 03

    Femtoscopy Measurement with SRIT TPC in Radioactive BeamHeavy-ion Collisions

    Y. J. Wang🇨🇳 · C. K. Tam · Z. G. Xiao🇨🇳 · W. G. Lynch🇺🇸 · C. Y. Tsang🇺🇸 · J. Barney🇺🇸 · G. Jhang🇺🇸 · J. Estee🇺🇸 · M. B. Tsang · R. S. Wang🇨🇳 · M. Kaneko🇯🇵 · J. W. Lee🇰🇷 and 55 other authors

    Femtoscopy is a powerful tool for exploring the dynamic emitting structure in heavy-ion collisions, while radioactive beam heavy-ion collisions enable the investigation of nuclear matter under extreme isospin conditions. Here, we successfully perform femtoscopy measurements using the SRIT Time Projection Chamber (TPC). A dedicated correction scheme for track merging and splitting is proposed, which is well applicable to rectangular TPCs housed inside dipole magnets and effectively improves the reconstructed correlation functions at small relative momenta. Focusing on the proton-proton (p-p) correlation function in the 270 MeV/u system, we successfully apply the track merging and splitting correction; additionally, the TPC angular acceptance exhibits a negligible impact on the correlation function. A systematic uncertainty quantification framework is established. The experimental results of the p-p correlation function confirm the feasibility of the SRIT TPC for femtoscopy measurements and provide technical support for high-precision femtoscopy studies using rectangular TPCs in radioactive beam heavy-ion collisions.

    ↳ physics.ins-detnucl-ex0 citations
  4. 04

    Prompt Fission Neutron Spectra of 233U(n, F), 235U(n, F), 239Pu(n, F) and 240Pu(n,F)

    V.M. Maslov

    The prompt fission neutron spectra of fuel and fertile nuclei are of key importance for the safety/efficiency of nuclear reactors, deployed or next generation either. The newly measured prompt fission neutron spectra and revisited prompt fission neutron spectra data for 235U(n,f), 239Pu(n,f) and 240Pu(n,f) reactions strongly discard the actual prompt fission neutron spectra evaluated data provided in available evaluated neutron data libraries. The reasons for that are rather diverse. The newly measured prompt fission neutron spectra are of double time of flight type. Rather wide range of the incident neutron energies, for which the outgoing prompt fission neutrons are lumped, complicates a lot the prompt fission neutron spectra measured data fits via physical modelling, especially after the onset of the (n,xnf) reactions. In most cases the measured prompt fission neutron spectra at discrete incident neutron energies up to 20 MeV, as well as those measured with double time of flight technique were considered not correlated and their consistent analyses were almost never tried upon with rare exceptions.

    ↳ nucl-thnucl-ex0 citations
  5. 05

    Bound-state beta decay of tritium: Path to first observation and novel approach to direct neutrino mass measurement

    Evgeny Akhmedov🇩🇪 · Thierry Lasserre🇩🇪 · Ferenc Glück🇩🇪 · Alejandro Saenz🇩🇪

    Bound-state -decay of tritium, the process, in which the final-state electron is created in a bound atomic state of the produced atom instead of freely flying away, is predicted by the standard theory of weak interactions but has not been observed so far. We study the possibility of its experimental observation through the detection of photons from radiative decay of the excited atomic states of neutral populated by this process. We also propose a novel approach to direct neutrino mass measurement and sterile neutrino search based on accurate determination of the speed of the produced atoms through Doppler broadening of the emitted photon lines.

    ↳ hep-phhep-exnucl-exphysics.atom-ph0 citations
  6. 06

    Ab initio lattice calculation of nuclear magnetic dipole moments with systematic error quantifications

    Teng Wang🇨🇳 · Serdar Elhatisari🇹🇷 · Xu Feng🇨🇳 · Dean Lee🇺🇸 · Bing-Nan Lu🇨🇳 · Yuan-Zhuo Ma🇺🇸

    Nuclear magnetic moments are sensitive probes of nuclear structure. However, their accurate quantitative description poses significant challenges, demanding both accurate nuclear and electromagnetic interactions as well as rigorous control of algorithmic uncertainties. Here, we present the first systematic calculation of magnetic dipole moments for selected light nuclei and aluminum isotopes within nuclear lattice effective field theory (NLEFT), an \textit{ab initio} framework applicable to medium-mass and heavy nuclei. Our calculations employ a lattice next-to-next-to-next-to-leading-order (NLO) chiral interaction together with electromagnetic currents consistently derived up to the two-body level. To achieve controlled predictions, we incorporate recently developed NLEFT algorithms and perform a comprehensive assessment of algorithmic uncertainties. Within the estimated uncertainties, our results are in good overall agreement with experiment and demonstrate that two-body currents are essential for reproducing the observed magnetic moments. We further benchmark our predictions against other \textit{ab initio} calculations for light nuclei (). Our work establishes a solid foundation for \textit{ab initio} studies of electroweak observables using methods that scale efficiently to medium-mass and heavy nuclei while demonstrating state-of-the-art accuracy.

    ↳ nucl-thhep-latnucl-ex1 citation

Affiliations

first authorsco-authorsvia INSPIRE