Comparative Geant4 benchmark of CEvNS recoil observables in germanium, argon, and xenon targets
New Physics: Sae Mulli, cilt.76, sa.8, ss.638-648, 2026 (Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 76 Sayı: 8
- Basım Tarihi: 2026
- Doi Numarası: 10.3938/npsm.76.638
- Dergi Adı: New Physics: Sae Mulli
- Derginin Tarandığı İndeksler: Scopus
- Sayfa Sayıları: ss.638-648
- Anahtar Kelimeler: CEvNS, Geant4, Neutrino, Particle
- Çukurova Üniversitesi Adresli: Evet
Özet
Coherent elastic neutrino–nucleus scattering (CEvNS) is a low-energy neutral-current process in which a neutrino interacts coherently with an entire nucleus and produces a nuclear recoil. In this work, a Geant4-based implementation of CEvNS recoil generation is developed for three representative target nuclei: germanium, argon, and xenon. The CEvNS interaction is introduced through a user-defined discrete process based on the Standard Model differential cross section and the Helm nuclear form factor. The incident electron-neutrino energy is sampled according to a decay-at-rest Michel spectrum, and a unified high-statistics Monte Carlo configuration is used for all target materials. The generated events are analyzed with ROOT to obtain recoil-energy spectra, scattering-angle distributions, differential cross-section weights, and the dependence of the Helm form factor on recoil energy. The results show the expected target-dependent hierarchy: argon produces the largest recoil-energy scale and broadest angular distribution, xenon produces the lowest recoil-energy scale and the strongest finite-size suppression, and germanium exhibits an intermediate response. These trends provide a numerical validation of the implemented CEvNS recoil-generation procedure and demonstrate the role of nuclear mass and coherence loss in shaping recoil-level observables. The study establishes a reproducible computational benchmark for comparative CEvNS recoil analysis, which can be extended in future work to include absolute flux normalization, detector response, quenching, thresholds, finite resolution, backgrounds, and experiment-specific event-selection criteria.