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 04:00:00 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
• Country of Publication: United States
• Language: English

Related Subjects

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