分类: 物理学 >> 核物理学 提交时间: 2023-10-09
摘要: Photonuclear reactions using a laser Compton scattering (LCS) gamma source provide a new method forproducing radioisotopes for medical applications. Compared with the conventional method, this method has theadvantages of a high specific activity and less heat. Initiated by the Shanghai Laser Electron Gamma Source(SLEGS), we conducted a survey of potential photonuclear reactions, (, n), (, p), and (, ) whose cross#2;sections can be measured at SLEGS by summarizing the experimental progress. In general, the data are rareand occasionally inconsistent. Therefore, theoretical calculations are often used to evaluate the production ofmedical radioisotopes. Subsequently, we verified the model uncertainties of the widely used reaction codeTALYS-1.96, using the experimental data of the 100Mo(, n) 99Mo, 65Cu(, n) 64Cu, and 68Zn(, p) 67Cu reac#2;tions.
分类: 光学 >> 量子光学 提交时间: 2023-02-19
摘要: Focusing electromagnetic field to enhance the interaction with matter has been promoting researches and applications of nano electronics and photonics. Usually, the evanescent-wave coupling is adopted in various nano structures and materials to confine the electromagnetic field into a subwavelength space. Here, based on the direct coupling with confined electron oscillations in a nanowire, we demonstrate an extreme localization of microwave field down to 10$^{-6}\lambda$. A hybrid nanowire-bowtie antenna is further designed to focus the free-space microwave to this deep-subwavelength space. Detected by the nitrogen vacancy center in diamond, the field intensity and microwave-spin interaction strength are enhanced by 2.0$\times$10$^{8}$ and 1.4$\times$10$^{4}$ times, respectively. Such an extreme concentration of microwave field will further promote integrated quantum information processing, sensing and microwave photonics in a nanoscale system.