arXiv subjects

Xingjian Lv

Publications and source records attributed to Xingjian Lv.

3 recordsLinked to original sources

arXiv2026

A Telescope System for Charge and Position Measurement of High Energy Nuclei

A high-granularity telescope system with a large sensitive area and low material budget has been developed for high-energy heavy ion beam tests. The telescope consists of nine layers of silicon microstrip detectors (SSDs), whose performance was validated through a heavy ion beam test at the CERN SPS. A hybrid machine learning algorithm is proposed to address the challenges of nuclear charge measurement with SSDs. The system achieves a spatial resolution of $\mathcal{O}(1) \,$\SI{}{\micro\metre} and a charge resolution better than 0.16 charge units for nuclei from $Z = 1$ to $Z = 29$, with a sensitive area of $8 \times 8 \, \mathrm{cm}^2$. To the best of our knowledge, this represents the most precise charge and spatial resolution simultaneously achieved by a silicon telescope to date.

physics.ins-det↗

arXiv2025

A Silicon Microstrip Detector for Power-Limited and Large Sensitive Area Applications

A silicon microstrip detector (SSD) has been developed to have state of the art spatial resolution and a large sensitive area under stringent power constraints. The design incorporates three floating strips with their bias resistors inserted between two aluminum readout strips. Beam test measurements with the single sensor confirmed that this configuration achieves a total detection efficiency of $99.8 \, \%$ and spatial resolution $7.6 \, \mathrm{μm}$ for MIPs. A double-$η$ algorithm was developed to optimize hit position reconstruction for this SSD. The design can be adapted for large area silicon detectors.

physics.ins-det↗

arXiv2025

Discrete treatment of inverse Compton scattering: implications on parameter estimation in gamma-ray astronomy

In gamma-ray astronomy and cosmic-ray physics, the continuous approximation of inverse Compton scattering (ICS) is widely adopted to model the evolution of electron energy. However, when the initial electron energy approaches $\sim100$ TeV, the discrete nature of ICS becomes prominent, and the energy of evolved electrons should be considered as a broad distribution rather than a deterministic value. By simulating the evolution paths of individual electrons under ICS, we capture this discrete nature and demonstrate that when the electron injection spectrum exhibits a high-energy cutoff, the correct discrete treatment yields a higher cutoff energy in the evolved spectrum compared to the continuous approximation. Applying the discrete ICS treatment to interpret the gamma-ray spectrum of the Geminga pulsar halo measured by HAWC, we find that the inferred cutoff energy of the injection spectrum is correspondingly lower than that derived using the continuous approximation at a $95\%$ confidence level. This suggests that the systematic bias introduced by the approximation has exceeded the measurement precision. We also expect the application of the discrete ICS correction in the PeV regime using the ultra-high-energy gamma-ray source 1LHAASO J1954+2836u as a case study, pointing out that adopting the continuous approximation may considerably overestimate the electron acceleration capability of the source.

astro-ph.HE↗