He-like ions are the simplest atomic system where the electron-electron interactions can be studied without any disturbance by further correlations. For heavy atomic systems the structure and dynamics differ significa...He-like ions are the simplest atomic system where the electron-electron interactions can be studied without any disturbance by further correlations. For heavy atomic systems the structure and dynamics differ significantly from those of light ions, and in this relativistic domain the current or magnetic interactions play an展开更多
Radiative Electron Capture (REC) and Non-radiative Electron Capture (NRC) are two main processes in relativistic ion-atom collisions, and the cross sections for REC and NRC processes are strongly dependent on target-Z...Radiative Electron Capture (REC) and Non-radiative Electron Capture (NRC) are two main processes in relativistic ion-atom collisions, and the cross sections for REC and NRC processes are strongly dependent on target-Z~[1]. For high-Z ions and relativistic collisions there are scarce experimental information on state-展开更多
Precision mass measurements of neutron-deficient 152Sm projectile fragments were conducted in 2005 at theFRS-ESR facility at GSI Helmholtz centre[1, 2], employing the time-resolved Schottky Mass Spectrometry[3]. A new...Precision mass measurements of neutron-deficient 152Sm projectile fragments were conducted in 2005 at theFRS-ESR facility at GSI Helmholtz centre[1, 2], employing the time-resolved Schottky Mass Spectrometry[3]. A newmass evaluation method has been developed in the data analysis. The systematic error in the mass determinationwas significantly reduced with the new method[4].Exotic nuclei, produced by projectile fragmentation of a 615 AMeV 152Sm primary beam in a 4.009 g/cm2beryllium target, were transmitted and B-separated by the fragment separator FRS and then injected and storedin the experimental storage ring ESR. In ESR the electron-cooling process was continuously applied to the storedions. To first order approximation, the revolution-frequencies (f) of the stored ions in the ESR are related to theirvelocities (v) and mass-to-charge ratios (m=q) of the ions in rest frame:展开更多
Recently, there has been great interest in the linear polarization of photons produced by radiative electron capture (REC, the time reversed photoionization in ion-atom collisions). No such data are available for the ...Recently, there has been great interest in the linear polarization of photons produced by radiative electron capture (REC, the time reversed photoionization in ion-atom collisions). No such data are available for the high-Z regime till now. By using high efficiency by by a new generation of segmented germanium detectors that have energy as well as position resolution this field can be investigated experimentally. The展开更多
The study of structure of few-electron heavy ions is of important interest due to the strong field effects. Helium-like ions are the simplest atomic multi-body systems. A considerable improved precision has been made ...The study of structure of few-electron heavy ions is of important interest due to the strong field effects. Helium-like ions are the simplest atomic multi-body systems. A considerable improved precision has been made in both theory and experiments recently. The experiment exploits the radiative recombination (RR) transitions into the vacant 1 s shell of bare and H-like ions. In this process, the energy carried by the emitted photon is the energy difference between the initial and final electron state, hω=Ekin+EB. For bare展开更多
K-shell ionization for Li-like uranium ions in collisions with a N2 target was performed at the ESR storage ring. We found surprisingly that in such close encounters the 2 s electron remain almost unaffected by the co...K-shell ionization for Li-like uranium ions in collisions with a N2 target was performed at the ESR storage ring. We found surprisingly that in such close encounters the 2 s electron remain almost unaffected by the collisions. A dedicated experimental study was conducted by using Li-like uranium ions at an initial energy of 378 MeV/u in order to manifest the situation. In Fig.1 a typical spectrum is shown registered by a Ge(i)展开更多
For the heaviest and simplest atomic system resonant transfer and excitation involving the innermost shell shave been investigated . We measured for H-like U^91.+ projectiles the KLjLj-RTE Using a H(2) gas target prov...For the heaviest and simplest atomic system resonant transfer and excitation involving the innermost shell shave been investigated . We measured for H-like U^91.+ projectiles the KLjLj-RTE Using a H(2) gas target providing the narrowest possible Compton profile for atomically confined quasi-free target electrons. We studied the emission patterns of the cascade decay of doubly excited He-like U90^+ ions where the first hypersatellite (Kαi-H) and the second satellite (Kαi′-S) transitions are energetically separated . Although the REC cascadecontributions to the satellite lines (Kαi′-S) dominate, the RTE contributions could be isolated. In particular,the hypersatellite (Kαi-H) transitions are free of REC contributions - neglecting possible small interference effects.展开更多
文摘He-like ions are the simplest atomic system where the electron-electron interactions can be studied without any disturbance by further correlations. For heavy atomic systems the structure and dynamics differ significantly from those of light ions, and in this relativistic domain the current or magnetic interactions play an
文摘Radiative Electron Capture (REC) and Non-radiative Electron Capture (NRC) are two main processes in relativistic ion-atom collisions, and the cross sections for REC and NRC processes are strongly dependent on target-Z~[1]. For high-Z ions and relativistic collisions there are scarce experimental information on state-
文摘Precision mass measurements of neutron-deficient 152Sm projectile fragments were conducted in 2005 at theFRS-ESR facility at GSI Helmholtz centre[1, 2], employing the time-resolved Schottky Mass Spectrometry[3]. A newmass evaluation method has been developed in the data analysis. The systematic error in the mass determinationwas significantly reduced with the new method[4].Exotic nuclei, produced by projectile fragmentation of a 615 AMeV 152Sm primary beam in a 4.009 g/cm2beryllium target, were transmitted and B-separated by the fragment separator FRS and then injected and storedin the experimental storage ring ESR. In ESR the electron-cooling process was continuously applied to the storedions. To first order approximation, the revolution-frequencies (f) of the stored ions in the ESR are related to theirvelocities (v) and mass-to-charge ratios (m=q) of the ions in rest frame:
文摘Recently, there has been great interest in the linear polarization of photons produced by radiative electron capture (REC, the time reversed photoionization in ion-atom collisions). No such data are available for the high-Z regime till now. By using high efficiency by by a new generation of segmented germanium detectors that have energy as well as position resolution this field can be investigated experimentally. The
文摘The study of structure of few-electron heavy ions is of important interest due to the strong field effects. Helium-like ions are the simplest atomic multi-body systems. A considerable improved precision has been made in both theory and experiments recently. The experiment exploits the radiative recombination (RR) transitions into the vacant 1 s shell of bare and H-like ions. In this process, the energy carried by the emitted photon is the energy difference between the initial and final electron state, hω=Ekin+EB. For bare
文摘K-shell ionization for Li-like uranium ions in collisions with a N2 target was performed at the ESR storage ring. We found surprisingly that in such close encounters the 2 s electron remain almost unaffected by the collisions. A dedicated experimental study was conducted by using Li-like uranium ions at an initial energy of 378 MeV/u in order to manifest the situation. In Fig.1 a typical spectrum is shown registered by a Ge(i)
文摘For the heaviest and simplest atomic system resonant transfer and excitation involving the innermost shell shave been investigated . We measured for H-like U^91.+ projectiles the KLjLj-RTE Using a H(2) gas target providing the narrowest possible Compton profile for atomically confined quasi-free target electrons. We studied the emission patterns of the cascade decay of doubly excited He-like U90^+ ions where the first hypersatellite (Kαi-H) and the second satellite (Kαi′-S) transitions are energetically separated . Although the REC cascadecontributions to the satellite lines (Kαi′-S) dominate, the RTE contributions could be isolated. In particular,the hypersatellite (Kαi-H) transitions are free of REC contributions - neglecting possible small interference effects.
