Fri·Jul 25, 2025Friday·July 25, 2025

1. 01*

   Production of Iodine Isotopes via Ultra-intense Laser Driven Photonuclear Reactions

   Weifu Yin🇺🇸 · Tongjun Xu · Guoqiang Zhang · Putong Wang🇨🇳 · Yihang Zhang🇨🇳 · Yufeng Dong🇮🇹 · Xiangai Deng🇨🇳 · Youjing Wang🇨🇳 · Zhiguo Ma🇨🇳 · Changbo Fu🇨🇳 · Kai Zhao🇨🇳 · Fenghua Qiao🇨🇳 and 14 other authors

   The investigation and production of proton-rich iodine isotopes predominantly rely on conventional accelerator-based methods, typically requiring prolonged irradiation periods to measure or achieve quantifiable yields for isotopic isolation. Bremsstrahlung radiation sources generated by high-power laser-plasma-accelerated electron beams with ultrahigh charge (tens of nanocoulombs) bombarding high-Z targets demonstrate extraordinary photon flux characteristics. An electron beam with a total charge of approximately 47.7 nC (E${}_e$ $>$ 10.4 MeV) was generated in our experiment by focusing a ultra-intense laser pulse onto a deuterium gas jet. Laser-driven bremsstrahlung was employed to induce ${}^{127}I$$(\gamma ,xn)$ ($x$ = 1,3,4,6-8), and the product yields and the corresponding flux-weighted average cross sections are reported. Our results demonstrate production of medical isotopes, with average yields of ${}^{124}$I and ${}^{123}$I at approximately $9.83\pm 0.45\times 10^5$/shot and $2.81\pm 0.11\times 10^5$/shot, respectively. This method, utilizing high-power lasers to generate bremsstrahlung radiation, shows significant potential for medical applications and opens new avenues for studying photonuclear processes in astrophysical contexts.

   nucl-ex0 citations
2. 02*

   Probing Spin and Lifetime Correlations in Entangled Hyperon-AntiHyperon Pairs

   Aihong Tang🇺🇸

   Quantum entanglement has now been demonstrated in several hadronic systems, revealing that non-classical spin correlations survive even through the strong-interaction hadronization process. To date, however, all studies have focused exclusively on angular observables, leaving the possibility untouched that quantum coherence might also influence the decay times of entangled partners. In this work we propose data-driven tests of spin-lifetime and lifetime-lifetime correlations for Lambda-antiLambda pairs produced in high-energy collisions. By examining the opening-angle distribution in slices of Delta t, constructing a pair-wise spin-lifetime correlator, and testing a simple lifetime-lifetime covariance, we search for deviations from independent exponential decay that align with known spin correlations. Observation of nonzero lifetime correlations would compel a reassessment of how entanglement manifests in decaying systems, revealing hitherto unexplored temporal coherence.

   nucl-exhep-exhep-phnucl-thPLB(2025)·6 citations
3. 03*

   Re-examination of fusion hindrance in astrophysical ${}^{12}$C+${}^{12}$C and ${}^{12}$C+${}^{13}$C reactions

   Kotaro Uzawa · Kouichi Hagino🇯🇵

   To determine the energy dependence of fusion cross sections at extremely low energies is crucial for various astrophysical processes. In the previous study by Jiang et al. [Phys. Rev. C75, 015803 (2007)], it was concluded that fusion cross sections for the ${}^{12}$C+${}^{12}$C system rapidly drop off as the energy decreases. We here re-examine this hindrance phenomenon. While the previous study fitted the logarithmic slope $L(E)$ of fusion cross sections with a function of $L(E)=A+B/E^n$ and searched the optimum value of $A$ and $B$ with $n=1.5$, we refit the data with the same function for $L(E)$ but by releasing the restriction on $n$. We find that the optimum values of $n$ significantly deviates from $n=1.5$, resulting in the absence of hindrance of fusion cross sections both in the ${}^{12}$C+${}^{12}$C and the ${}^{12}$C+${}^{13}$C systems.

   ↳ nucl-thastro-ph.SRnucl-exPRC(2025)·3 citations
4. 04*

   Three-dimensional position reconstruction of orthogonal-strip planar high-purity germanium detectors using maximum likelihood estimation

   Qiuli Zhang🇨🇳 · Peng Zhang🇨🇳 · Wenhhan Dai🇨🇳 · Mingxin Yang🇨🇳 · Yang Tian🇨🇳 · Ming Zeng🇨🇳 · Hao Ma · Zhi Zeng🇨🇳

   Orthogonal-strip planar high-purity germanium (HPGe) detectors can reconstruct three-dimensional (3D) positions of photon interactions through analysis of parameters extracted from multiple charge signals. The conventional method independently reconstructs positions in each dimension using amplitude-based parameters, leading to noise sensitivity and systematic biases. In this study, we propose a multi-parameter-joint reconstruction method based on maximum likelihood estimation (MLE) which establishes a mapping between pulse shape parameters and corresponding 3D positions. To mitigate the effects of electronic noise, we employ integral-based parameters. The reconstruction performance was evaluated using pulse shape simulations. For 100 keV photons under 1 keV root-mean-square (RMS) electronic noise, the maximum Z reconstruction bias was reduced from 0.4 mm to 0.02 mm in the central region and from 2 mm to 0.15 mm near the electrodes. The maximum reconstruction bias in the X/Y directions was reduced from 0.4 mm to 0.016 mm. Furthermore, the use of integral-based parameters mitigated the rapid degradation of resolution under high-noise conditions. The achieved position resolution ranged from 0.07 mm to 0.16 mm in the Z directions and from 0.07 mm to 0.44 mm in the X/Y direction. This method offers a promising approach to 3D position reconstruction with HPGe detectors for applications such as medical imaging and gamma-ray astronomy.

   ↳ physics.ins-detnucl-exJINST(2025)·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.