Enhanced Isomer Population via Direct Irradiation of Solid-Density Targets Using a Compact Laser-Plasma Accelerator.

• Tác giả: Lee A Bernstein, Joshua Brown, Qiang Chen, Eric H Esarey, Cameron G R Geddes, Robert E Jacob, Tobias Ostermayr, Dieter H G Schneider, Carl B Schroeder, Speero M Tannous, Jeroen van Tilborg
• Ngôn ngữ: eng
• Ký hiệu phân loại: 304.6 Population
• Thông tin xuất bản: United States : Physical review letters , 2025
• Bộ sưu tập: NCBI
• ID: 474017

Tóm tắt

 Excitation of long-lived states in bromine nuclei using a tabletop laser-plasma accelerator providing pulsed (<
 100  fs) electron beams provided a sensitive probe of γ strength and level densities in the nuclear quasicontinuum and may indicate angular momentum coupling through electron-nuclear interactions. Solid-density active LaBr_{3} targets absorb real and virtual photons up to 35±2.5  MeV and deexcite through γ cascade into different states. A factor of 4.354±0.932 enhancement of the ^{80}Br^{m}/^{80}Br^{g} isomeric ratio was observed following electron irradiation, as compared to bremsstrahlung. Additional angular momentum transfer could possibly occur through nuclear-plasma or electron-nuclear interactions enabled by the ultrashort electron beam. Further investigation of these mechanisms could have far-reaching impact including decreased storage of long-term nuclear waste and an improved understanding of heavy element formation in astrophysical settings.