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Projectile-charge dependence of quasi-free-electron bremsstrahlung

Journal Article · · Phys. Rev. A; (United States)
; ; ; ;

Continuum x rays induced by bombardments of a Be target with 20.14-MeV/amu protons and /sup 3/He/sup 2 +/ ions have been measured with a Si(Li) detector in the direction of 90/sup 0/ with respect to the incident beam. Difference in the x-ray--production cross sections multiplied by the x-ray energy h..omega.. )h..omega.. x (sigma/sub h/(h..omega..)/4-sigma/sub p/(h..omega..))) and ratio of the cross sections R(h..omega..) (equivalentsigma/sub h/(h..omega..)/4sigma/sub p/(h..omega..)) for the proton and /sup 3/He/sup 2 +/-ion impact, where sigma/sub h/(h..omega..) and sigma/sub p/(h..omega..) are the x-ray--production cross sections for proton and /sup 3/He/sup 2 +/-ion impact, respectively, were obtained as a function of the x-ray energy. Both the difference and the ratio show peaks in the region where the x-ray energy is equal to the relative kinetic energy between the projectile and the inner-shell electron to be scattered by the projectile. From the comparison with a theory of quasi-free-electron bremsstrahlung based on the impulse approximation, it is found that this peak corresponds to the maximum of the velocity-distribution function of the inner-shell electron. Furthermore, the contribution of radiative electron-capture process in the case of proton and /sup 3/He/sup 2 +/ impact is clearly found.

Research Organization:
Cyclotron and Radioisotope Center, Tohoku University, 980 Sendai, Japan
OSTI ID:
5908976
Journal Information:
Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 27:4; ISSN PLRAA
Country of Publication:
United States
Language:
English

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Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALKALINE EARTH METALS
ALPHA PARTICLES
BARYONS
BERYLLIUM
BREMSSTRAHLUNG
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY DEPENDENCE
FERMIONS
HADRONS
ION COLLISIONS
IONIZING RADIATIONS
METALS
NUCLEONS
PROTONS
RADIATIONS
WAVELENGTHS
X RADIATION