1 AMS ACTIVITIES IN JAPAN ANDAROUND THE WORLD. Following the first success of accelerator mass spectrometry (AMS) in detecting ^14C by Muller in 1977, its technique was rapidly embraced by the low energy nuclear physi...1 AMS ACTIVITIES IN JAPAN ANDAROUND THE WORLD. Following the first success of accelerator mass spectrometry (AMS) in detecting ^14C by Muller in 1977, its technique was rapidly embraced by the low energy nuclear physicists with encouragement from several archaeologists, biologists and environmental scientists.Subsequently, several smaller and not so smallel ectrostatic tandem accelerators have been resurrected as AMS machines, and many nuclear physics laboratories have commenced their AMS research program. In parallel, a number of new facilities which are dedicated to the AMS studies have been constructed. Up to now, more than 40 AMS laboratories are active around the world (Fig. 1). 4 AMS laboratories are actively operating in China. 8 AMS laboratories which are working in Japan are listed in Table 1. In this talk, I will look briefly at the development of the field, will survey its current status, especially the effort of the Japanese group, and will mention about the future.展开更多
LECR3 (Lanzhou ECR ion source No.3) is a high performance Electron Cyclotron Resonance ion source designed for atomic physics research. It was designed and fabricated in 2000, and after about one year's commission...LECR3 (Lanzhou ECR ion source No.3) is a high performance Electron Cyclotron Resonance ion source designed for atomic physics research. It was designed and fabricated in 2000, and after about one year's commissioning, it was used to deliver multiply charged ion beams for the successive atomic physics experimental terminals. This source is a double-frequency heating ion source. It was designed running at 10 GHz or 14.展开更多
We have systematically investigated the X-rays emission of hollow atoms (HA) which formed in the interaction of highly charged ions with a variety of solid surfaces at the atomic physics experimental setup of IMP. The...We have systematically investigated the X-rays emission of hollow atoms (HA) which formed in the interaction of highly charged ions with a variety of solid surfaces at the atomic physics experimental setup of IMP. The X-ray spectra were measured by Si(Li) detectors with effective energy ranging from 1 keV to 60 keV. The results show that, the X-ray emission from the formed HA is closely correlated with the charge state of the projectile ions, and weakly correlated with the velocity of the projectile ions. For example, it was found that when Ar^18+ ions interact with Be-target, the yield of K X-ray with character energy of 3.0 keV is 7.2×10^-3 per ion, which is two times and 5 order of magnitude higher than those in the interactions of Ar^17+ and Ar^16+ ions respectively. When Ar15+ ions interact with the same targets, the Argon K X-ray would be too feeble to be detected. The X-ray yield with single ion in this experiment can be represented by the following equation,展开更多
文摘1 AMS ACTIVITIES IN JAPAN ANDAROUND THE WORLD. Following the first success of accelerator mass spectrometry (AMS) in detecting ^14C by Muller in 1977, its technique was rapidly embraced by the low energy nuclear physicists with encouragement from several archaeologists, biologists and environmental scientists.Subsequently, several smaller and not so smallel ectrostatic tandem accelerators have been resurrected as AMS machines, and many nuclear physics laboratories have commenced their AMS research program. In parallel, a number of new facilities which are dedicated to the AMS studies have been constructed. Up to now, more than 40 AMS laboratories are active around the world (Fig. 1). 4 AMS laboratories are actively operating in China. 8 AMS laboratories which are working in Japan are listed in Table 1. In this talk, I will look briefly at the development of the field, will survey its current status, especially the effort of the Japanese group, and will mention about the future.
文摘LECR3 (Lanzhou ECR ion source No.3) is a high performance Electron Cyclotron Resonance ion source designed for atomic physics research. It was designed and fabricated in 2000, and after about one year's commissioning, it was used to deliver multiply charged ion beams for the successive atomic physics experimental terminals. This source is a double-frequency heating ion source. It was designed running at 10 GHz or 14.
文摘We have systematically investigated the X-rays emission of hollow atoms (HA) which formed in the interaction of highly charged ions with a variety of solid surfaces at the atomic physics experimental setup of IMP. The X-ray spectra were measured by Si(Li) detectors with effective energy ranging from 1 keV to 60 keV. The results show that, the X-ray emission from the formed HA is closely correlated with the charge state of the projectile ions, and weakly correlated with the velocity of the projectile ions. For example, it was found that when Ar^18+ ions interact with Be-target, the yield of K X-ray with character energy of 3.0 keV is 7.2×10^-3 per ion, which is two times and 5 order of magnitude higher than those in the interactions of Ar^17+ and Ar^16+ ions respectively. When Ar15+ ions interact with the same targets, the Argon K X-ray would be too feeble to be detected. The X-ray yield with single ion in this experiment can be represented by the following equation,
