Fri·Jan 17, 2025Friday·January 17, 2025

1. 01*

   Nuclear level density of ${}^{128}$Te from $(\mathrm{p},{\mathrm{p}}^{\prime }\gamma )$ scattering and complementary photonuclear data

   P.-A. Söderström🇩🇪 · A. Kuşoğlu🇹🇷 · S. Aogaki🇷🇴 · D. L. Balabanski🇷🇴 · S.-R. Ban · R. Borcea · M. Brezeanu · S. Calinescu · C. Costache🇷🇴 · R. Corbu · M. Cuciuc · A. Dhal🇷🇴 and 24 other authors

   We have extracted the nuclear level density of ${}^{128}$Te from a $(\mathrm{p},{\mathrm{p}}^{\prime }\gamma )$ scattering experiment using the large-volume \labr\ and \cebr\ detectors from ELI-NP at the 9~MV Tandem facilities at IFIN-HH. The decay data were normalised using photonuclear data, resulting in nuclear level densities without intrinsic model dependencies from the constant temperature or Fermi gas models. The deduced nuclear level density follows in between the expectations from these two models, but we observe a clear divergence from a microscopic model based on the Skyrme force.

   nucl-exPhys.Scripta(2025)·3 citations
2. 02*

   Extract neutron-neutron interaction strength and spatial-temporal dynamics of neutron emission from two-particle correlation function

   Dawei Si · Sheng Xiao · Zhi Qin · Yuhao Qin · Junhuai Xu · Baiting Tian · Boyuan Zhang · Haojie Zhang · Dong Guo · Yijie Wang · Xiaobao Wei · Yibo Hao and 16 other authors

   The neutron-neutron ($nn$) correlation function has been measured in 25 MeV/u ${}^{124}$Sn+${}^{124}$Sn reactions. Using the Lednický-Lyuboshitz approach, the $nn$ scattering length and effective range ($f_0^{nn}$, $d_0^{nn}$), as well as the reduced space-time size $R^{(0)}$ of the neutron emission source are simultaneously extracted as ($18.9_{-1.2}^{+1.3}$ fm, $1.9_{-1.0}^{+1.3}$ fm) and $4.12\pm 0.12$ fm, respectively. The measured $nn$ scattering length is consistent with the results obtained in the low-energy scattering ${}^2\mathrm{H}({\pi }^{-},\gamma )2n$, indicating heavy-ion collisions can serve as an effective approach for measuring $nn$ interactions and further investigating the charge symmetry breaking of nuclear force. The space-time size extracted from momentum-gated correlation functions exhibits clear dependence on the pair momentum, with $R^{(0)}=2.8\pm 0.1$ fm and $4.9\pm 0.2$ fm being determined for the high and low momentum neutrons, respectively.

   nucl-exPRL(2025)·25 citations
3. 03*

   Order-by-order uncertainties of nucleon-nucleon Wolfenstein amplitudes in chiral effective field theory

   B. McClung🇺🇸 · Ch. Elster🇺🇸 · D. R. Phillips🇺🇸

   Quantum mechanical invariance principles dictate the most general operator structure that can be present in the nucleon-nucleon (NN) interaction. Five independent operators appear in the on-shell NN amplitude together with five corresponding coefficient functions. The usual choice for these coefficient functions is known as the NN Wolfenstein amplitudes. We analyze the order-by-order convergence of each of the five NN Wolfenstein amplitudes predicted by a semi-local coordinate space potential implementation of chiral effective field theory ($\chi$EFT). We do this at laboratory kinetic energies between 25 and 200 MeV for both neutron-proton and proton-proton scattering. Our analysis uses the Gaussian-Process methods developed by the BUQEYE collaboration to describe the contributions of each $\chi$EFT order, and so yields truncation uncertainties for each Wolfenstein amplitude that are correlated across scattering angles. We combine information on the size of different orders in the EFT to infer the $\chi$EFT breakdown scale for each amplitude, finding, on average, ${\Lambda }_b$ between 750 and 800 MeV. With this choice of ${\Lambda }_b$, the EFT truncation uncertainties cover both higher-order results and empirical Wolfenstein amplitudes well for all orders other than the leading order.

   ↳ nucl-thnucl-exPRC(2025)·2 citations
4. 04*

   Visualization of quantum interferences in heavy-ion elastic scattering

   Kyoungsu Heo🇰🇷 · K. Hagino🇯🇵

   We investigate various interference effects in elastic scattering of the $\alpha +{}^{40}\text{Ca}$ system at $E_{\mathrm{lab}}=29$ MeV. To this end, we use an optical potential model and decompose the scattering amplitude into four components, that is, the near-side and the far-side components, each of which is further decomposed into the barrier-wave and the internal-wave components. Each component contributes distinctively to the angular distributions, revealing unique quantum interference patterns. We apply the Fourier transform technique to visualize these interference effects. By analyzing the images at specific scattering angles, we identify the positions and intensities of peaks corresponding to each interference component. This analysis offers insight into structural features of the angular distribution which are not apparent from the differential cross sections alone.

   ↳ nucl-thnucl-exPRC(2025)·2 citations
5. 05*

   Anomalous nuclear effects on ion charge state distribution in helium gas

   Sota Kimura · Michiharu Wada · Hiromitsu Haba · Hironobu Ishiyama · Toshitaka Niwase · Marco Rosenbusch🇩🇪 · Peter Schury

   The influence of isotope differences on ion charge state yield ratios has never been studied in detail, having been considered negligible. However, we have observed anomalous ion charge state distributions in the thermalization of energetic atomic ions in helium gas; the charge state distributions varied between not only isotopes but also between nuclear states within the same nuclide. The magnitude of the observed results suggests that this anomaly is a universal phenomenon that cannot be explained by the framework of the known isotope effects. Nuclear spin and deformation could be key to unraveling this, but the mechanisms remain an open question.

   ↳ physics.atom-phnucl-ex0 citations
6. 06*

   Scintillation and Timing Performance of a 3at% Yttrium-Doped Barium Fluoride Crystal

   Zeyu Huang🇨🇳 · Jing Zhang🇫🇷 · Shiming Zou · Mingkuan Yuan🇨🇳 · Jiawei Xu🇺🇸 · Xiyang Wang🇨🇳 · Shiqing Xie · Jinhui Chen🇨🇳 · Junfeng Chen🇨🇳 · Xiaolong Wang🇨🇳

   We report the scintillation and timing performance of a new developed 200 * 20 mm * 20 mm large size barium fluoride crystal doped with 3at% yttrium (BaF2:Y) to enhance the application for high time resolution. This doping effectively suppresses the slow scintillation component while maintaining most of the fast component, as confirmed by X-ray excited luminescence measurements. The BaF2:Y crystal demonstrated a transmittance of near 90% in the visible spectrum and a light response uniformity parameter of delta = (-2.74 +- 1.15)% when coupled with the tail end. The actual yttrium content varied from 2.1at% near the seed end to 3.7at% at the tail end. The assembled large BaF2:Y detector with silicon photomultipliers exhibited a time resolution of (82.2 +- 2.6) ps using constant fraction discrimination method in a cosmic ray test and (140.1 +- 3.8) ps using a low fixed threshold method in a beam test at Shanghai Synchrotron Radiation Facility with an 1.35 GeV electron beam. These results indicate the significant potential of BaF2:Y crystal for various applications, such as detectors for particle physics and nuclear physics.

   ↳ physics.ins-dethep-exnucl-exJINST(2025)·1 citation
7. 07*

   Simple and fast method for the analysis of ${}^{236}$U, ${}^{237}$Np, ${}^{239}$Pu and ${}^{240}$Pu from seawater samples by Accelerator Mass Spectrometry

   Mercedes López-Lora · Isabelle Levy · Elena Chamizo

   A simple and fast radiochemical procedure for the sequential extraction of U, Np and Pu from small-volume seawater samples ($<10$ L) is presented. The method has been developed and optimized for the final determination of ${}^{236}$U, ${}^{237}$Np, ${}^{239}$Pu and ${}^{240}$Pu by Accelerator Mass Spectrometry (AMS). It is based on the use of ${}^{242}$Pu as tracer for both Np and Pu isotopes. Samples are pre-concentrated by Fe(OH)${}_2$ co-precipitation. TEVA and UTEVA resins are used in a very simplified way for the final purification of the Pu+Np and U fractions, respectively. The radiochemical yields of the three elements have been investigated in detail by alpha spectrometry (AS) and gamma spectrometry (GS). The obtained results indicate high and robust chemical yields for the three elements and similar ones for Pu and Np. Furthermore, the use of ${}^{242}$Pu as tracer for ${}^{237}$Np is validated by analyzing a reference seawater sample (IAEA-443) by radiometric techniques. We demonstrated that, if chemicals are properly chosen, processed blank levels can be kept at the same level of the extremely low detection limits that can be achieved by AMS ($10^5-10^6$ atoms/sample). The procedure is finally applied for the study by AMS of a reference seawater sample from the Mediterranean Sea (IAEA-418).

   ↳ physics.app-phnucl-exTalanta(2019)·2 citations
8. 08*

   Monitoring lead-acid battery function using operando neutron radiography

   Jose Miguel Campillo-Robles · Damian Goonetilleke · Daniel Soler · Neeraj Sharma · Damian Martín Rodríguez🇪🇸 · Thomas Bücherl · Malgorzata Makowska · Pinar Türkilmaz · Volkan Karahan

   Investigating batteries while they operate allows researchers to track the inner electrochemical processes involved in working conditions. This study describes the first neutron radiography investigation of a lead-acid battery. A custom-designed neutron friendly lead-acid cell and casing is developed and studied operando during electrochemical cycling, in order to observe the activity within the electrolyte and at the electrodes. This experimental work is coupled with Monte Carlo simulations of neutron transmittance. Details of cell construction, data collection and data analysis are presented. This work highlights the potential of neutron imaging for tracking battery function and outlines opportunities for further development.

   ↳ physics.ins-detnucl-exJ.Power Sources(2019)·0 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.