L- and M-shell x-ray production cross sections of neodymium, gadolinium, holmium, ytterbium, gold, and lead by 25-MeV carbon and 32-MeV oxygen ions

Thesis/Dissertation · Thu Jan 01 00:00:00 EST 1987

OSTI ID:6989722

Andrews, III, M C

L- and M-shell x-ray production cross sections were measured for thin solid targets of neodymium, gadolinium, holmium, ytterbium, gold, and lead by 25-MeV /sup 12/C/sup q+/ (q = 4,5,6) and by 32-MeV /sup 16/O/sup q+/ (q = 5,7,8). The cross sections were determined from measurements made with thin targets (<2.5 ..mu..g/cm/sup 2/). For projectiles with one or two K-shell vacancies, the target x-ray production cross sections were found to be enhanced over those for projectiles without a K-shell vacancy. The sum of direct ionization to the continuum (DI) plus electron capture (EC) to the L, M, N... shells and EC to the K shell of the projectile were extracted from the data. The results are compared to the predictions of first Born theories, i.e., plane-wave Born approximation for DI and Oppenheimer-Brinkman-Kramers formula of Nikolaev for EC and to the ECPSSR approach that accounts for energy loss and Coulomb deflection of the projectile as well as for relativistic and perturbed stationary states of inner-shell electrons.

• Research Organization: North Texas State Univ., Denton (USA)
• OSTI ID: 6989722
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
GADOLINIUM
ION COLLISIONS
GOLD
HOLMIUM
ION-ATOM COLLISIONS
X-RAY SPECTRA
LEAD
NEODYMIUM
YTTERBIUM
CARBON IONS
CROSS SECTIONS
MEV RANGE 10-100
OXYGEN IONS
ATOM COLLISIONS
CHARGED PARTICLES
COLLISIONS
ELEMENTS
ENERGY RANGE
IONS
METALS
MEV RANGE
RARE EARTHS
SPECTRA
TRANSITION ELEMENTS
640304* - Atomic
Molecular &amp; Chemical Physics- Collision Phenomena