Target and projectile K x-ray production by 100, 160, and 200 MeV Nb collisions with thick solid targets
نویسنده
چکیده
2014 Target and projectile K x-ray cross-sections produced in collisions of Nb projectiles with a series of targets (Zt = 6 68) are reported for energies of 100, 160 and 200 MeV. Various K-vacancy production theories were tested over this broad range including electron promotion with vacancy sharing (molecular model), direct excitation (ECPSSR theory), modified binary encounter approximation (BEA), as well as some semi-empirical recipes. For most of the collision systems investigated the molecular model is found to be the dominant mechanism for K-vacancy production in both projectile and target. For highly asymmetric collisions, the ECPSSR calculations are found to be within a factor of two of the data for the lightest targets (C, Al), but fail for the heaviest targets. J. Phys. France 51 (1990) 735-745 15 AVRIL 1990,
منابع مشابه
Molecular Orbital Effects in Near-symmetric Collisions of 10 A MeV Heavy Ions with Solid Targets
Cross sections for target atom K vacancy production have been measured recently, using solid targets of Cu, Mo, Ag, Sn, Sm, and Ta bombarded by 10 A MeV beams of H, Ne, Ar, Cr, Kr, Xe, and Bi [1]. It was found that the target K x-ray production cross section becomes enhanced as the target atomic number Z2 approaches the atomic number Z1 of the projectile. The purpose of the work presented here ...
متن کاملSpectroscopic Investigation of Heavy Ion Stopping Processes in Solids
The experiments were aimed to receive a space resolved information on the projectile and target K-shell radiation caused by inelastic collisions of fast heavy ions penetrating extended targets. Ca projectiles with the energies of 5.9 and 11.4 MeV/u were stopped in different media: quartz, CaF2 and porous SiO2 aerogels. X-ray emission from the ion beam target interaction zone were registered by ...
متن کاملComputer simulation techniques to design Xenon-124 solid target for iodine-123 production
Background: Iodine-123 (123I) is regarded as one of the best radionuclides for in vivo medical studies using single-photon emission computed tomography (SPECT) due to its suitable physical property. Materials and Methods: To design a new system in order to replace cryogenically solidified xenon target by the gas one, some necessary calculations are needed to be done such as finding the excitati...
متن کاملState-Selective Electron Capture Studied for U90+ Ions in Collisions with Gaseous Targets
In relativistic collisions involving high-Z projectiles and heavy target atoms, non-radiative electron capture (NRC) is a very important charge exchange process [1], a process mediated by three-body interaction. In general, a precise theoretical treatment of this process is very difficult to achieve since the Coulomb field of the fast moving projectile leads to distortions of the atomic target ...
متن کاملTargetry for cyclotron production of no-carrier-added cadmium-109 from natAg(p,n)109Cd reaction
Background: Solid targets that consist of powder and electrodeposited targets are used commonly to produce radionuclides by accelerators. Since silver is easily electrodeposited in cyanide baths and has a very excellent thermal conductivity, the electrodeposited target is preferable to produce 109Cd. To avoid cracking or peeling of the target during bombardment, it should have a level surface a...
متن کامل