A method for effectively generating long-lived Moessbauer photons and methods for proving the associated ;Moessbauer effects are reported. For the first time, we observed resonant propagation and resonant absorption o...A method for effectively generating long-lived Moessbauer photons and methods for proving the associated ;Moessbauer effects are reported. For the first time, we observed resonant propagation and resonant absorption of 40-keV Moessbauer photons emitted from ^103Rh through （γ, γ′） process excited by bremsstrahlung. This is a new efficient way to generate long-lived isomer （〉 1ms） for Moessbauer spectroscopy with sufficient brilliance. An abnormally large ratio of resonant absorption between horizontal and vertical directions indicates horizontal trapping- of Moessbauer photons and anisotropic Mbssbauer emission, which can be attributed to gravitational effect on the ^103Rh Moessbauer isomer with extremely narrow 10^-19eV linewidth.展开更多
A series of completely sealed standing-wave (SW) accelerator guides was developed and installed on 3,4, 6, 9 and 14 MeV home-made electron linacs for medical and industrial uses. In the development of these SW guides,...A series of completely sealed standing-wave (SW) accelerator guides was developed and installed on 3,4, 6, 9 and 14 MeV home-made electron linacs for medical and industrial uses. In the development of these SW guides, various subjects, including particle dynamics, microwave properties etc, were studied. The fsctors influencing the transverse motion were considered analytically and using a simulation code, TRSV. The problem of electron backbombardment in SW linac was analyzed by a 3-dimensional trace code, SB. Simultaneously decreasing the length of the first cavity and the injection voltage can reduced the electron backbombarding power. The code PPDW based on equivalent circuit theory was developed to analyze many microwave characteristics of arbitrarily composed coupled cavity chains. This research contributed to the successful development of the 3, 4, 6, 9 and 14MeV SW accelerator guides. For example, in the recently developed 14MeV SW guide, the beam passes smoothly through a 1.45 m long guide with a beamhole (diameter of 7 mm) without using a focusing solenoid.展开更多
文摘A method for effectively generating long-lived Moessbauer photons and methods for proving the associated ;Moessbauer effects are reported. For the first time, we observed resonant propagation and resonant absorption of 40-keV Moessbauer photons emitted from ^103Rh through （γ, γ′） process excited by bremsstrahlung. This is a new efficient way to generate long-lived isomer （〉 1ms） for Moessbauer spectroscopy with sufficient brilliance. An abnormally large ratio of resonant absorption between horizontal and vertical directions indicates horizontal trapping- of Moessbauer photons and anisotropic Mbssbauer emission, which can be attributed to gravitational effect on the ^103Rh Moessbauer isomer with extremely narrow 10^-19eV linewidth.
文摘A series of completely sealed standing-wave (SW) accelerator guides was developed and installed on 3,4, 6, 9 and 14 MeV home-made electron linacs for medical and industrial uses. In the development of these SW guides, various subjects, including particle dynamics, microwave properties etc, were studied. The fsctors influencing the transverse motion were considered analytically and using a simulation code, TRSV. The problem of electron backbombardment in SW linac was analyzed by a 3-dimensional trace code, SB. Simultaneously decreasing the length of the first cavity and the injection voltage can reduced the electron backbombarding power. The code PPDW based on equivalent circuit theory was developed to analyze many microwave characteristics of arbitrarily composed coupled cavity chains. This research contributed to the successful development of the 3, 4, 6, 9 and 14MeV SW accelerator guides. For example, in the recently developed 14MeV SW guide, the beam passes smoothly through a 1.45 m long guide with a beamhole (diameter of 7 mm) without using a focusing solenoid.
