L-subshell ionization of Ce, Nd, and Lu by 4-10-MeV C ions

Journal Article · Mon Aug 15 04:00:00 EDT 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.72.022729· OSTI ID:20718149

Lapicki, G ^[1]; Mandal, A C ^[2]; Santra, S; Mitra, D; Sarkar, M; Bhattacharya, D; Sen, P ^[3]; Sarkadi, L ^[4]; Trautmann, D ^[5]

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1. Department of Physics, East Carolina University, Greenville, North Carolina 27858 (United States)
2. Department of Physics, University of Burdwan, Burdwan 713104 (India)
3. Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064 (India)
4. Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI) H-4001, Debrecen, Pf. 51 (Hungary)
5. Institute fuer Theoretische Physik, Universitaet Basel, Klingelbergstrasse 82, CH-4056 Basel (Switzerland)

Ll,L{alpha},L{beta},L{gamma},L{gamma}{sub 1+5},L{gamma}{sub 2+3},L{gamma}{sub 4+4=} {sup '} x-ray production cross sections of {sub 58}Ce, {sub 60}Nd and {sub 71}Lu induced by 4-, 6-, 8-, and 10-MeV carbon ions were measured. For Lu, L{gamma}{sub 2+3} is separated from L{gamma}{sub 2+3+6} after revision of the technique of Datz et al. so that L{gamma}{sub 1+5} was used instead of L{gamma}{sub 1}, the L{gamma}{sub 4+4{sup '}}/L{gamma}{sub 1+5} ratio was corrected for multiple ionization, and uncertainties in L{gamma}{sub 4+4{sup '}} were incorporated in the fitting process. L-subshell ionization cross sections were extracted as a weighted average from two combinations of these cross sections, {l_brace}L{alpha},L{gamma}{sub 1+5},L{gamma}{sub 2+3}{r_brace} and {l_brace}L{alpha},L{gamma}{sub 1+5},L{gamma}{r_brace}. It is shown that, to within a few percent, the first of these two combinations results in the identical cross sections as this weighted average. Within 10%, permutations of different sets of single-hole atomic parameters yielded the same ionization cross sections. These cross sections are typically within 15% and at most 35% of the cross sections obtained with atomic parameters that were altered in two different ways for multiple ionization. Extracted subshell and total L-shell ionization cross sections as well as Ce and Nd data of Braziewicz et al. are compared with the ECPSSR theory of Brandt and Lapicki that accounts for the energy-loss (E), Coulomb-deflection (C), perturbed-stationary-state (PSS) and relativistic (R) effects. These measurements are also compared with the ECPSSR theory after its corrections--in a separated and united atom (USA) treatment, and for the intrashell (IS) transitions with the factors of Sarkadi and Mukoyama normalized to match L-shell cross section with the sum of L-subshell cross sections--as well as with the similarly improved semiclassical approximation of Trautmann. For Ce and Nd, the agreement of the extracted ionization cross sections with these theories is poor for L{sub 1} and good for L{sub 2}, L{sub 3}, and total L shell ionization. For the L{sub 2} subshell, this agreement is better for Ce and Nd than for Lu. The ECPSSR theory corrected for the USA and IS effects is surprisingly good for the L{sub 1}-subshell ionization of Lu, while at 4 MeV a similarly corrected semiclassical approximation is in excellent agreement with L{sub 2} and L{sub 3} data but overestimates the L{sub 1} measurement by almost a factor of 2.

• OSTI ID: 20718149
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 72; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
CARBON IONS
CATIONS
CERIUM
CORRECTIONS
INNER-SHELL IONIZATION
ION-ATOM COLLISIONS
L SHELL
LUTETIUM
MEV RANGE
NEODYMIUM
PERTURBATION THEORY
RELATIVISTIC RANGE
SEMICLASSICAL APPROXIMATION
X RADIATION