L{sub 1}-L{sub 3} Coster-Kronig yield for elements with 70{<=}Z{<=}81

Journal Article · Mon Mar 01 00:00:00 EST 2004 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.69.032501· OSTI ID:20640845

Sharma, Manju; Singh, Prem; Mehta, D; Singh, Nirmal ^[1]; Puri, Sanjiv ^[2]

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1. Department of Physics, Panjab University, Chandigarh 160 014 (India)
2. Department of Physics, SLIET, Longowal 148 106 (India)

The L{sub 1}-L{sub 3} Coster-Kronig (CK) yield f{sub 13} for the {sub 70}Yb, {sub 71}Lu, {sub 74}W, {sub 75}Re, {sub 79}Au, {sub 80}Hg, and {sub 81}Tl elements was deduced using measured intensities of the L{alpha} x rays emitted following decay of the L{sub i}-subshell (i=1,2,3) vacancies produced in widely different proportions by the 59.54 keV {gamma} rays (B{sub L{sub 1}}<E{sub inc}<B{sub K}) and the Ge/Se/Rb K x rays (B{sub L{sub 3}}<E{sub K{alpha}}<B{sub L{sub 2}},B{sub L{sub 1}}{sub L{sub 2}}<E{sub K{beta}}<B{sub K}); where B{sub KLi} is the K-shell/L{sub i}-subshell binding energy of the target element. An energy-dispersive x-ray fluorescence set up, involving photon sources consisting of a {sup 241}Am annular source in the direct and secondary excitation modes along with the Ge/Se/RbCl secondary exciter and a Si(Li) detector, was used for the measurements. The measured f{sub 13} yields for {sub 70}Yb, {sub 71}Lu, and {sub 74}W are found to agree with the values based on the relativistic Dirac-Hartree-Slater (RDHS) calculations, while those for {sub 79}Au, {sub 80}Hg, and {sub 81}Tl are lower by {approx}20%. The measured f{sub 13} yields exhibit a jump from 0.354(24) for {sub 74}W to 0.450(27) for {sub 75}Re compared to that from 0.352 to 0.640 as predicted by the RDHS calculations due to onset of the intense L{sub 1}-L{sub 3}M{sub 5} CK transition.

• OSTI ID: 20640845
• Journal Information: Physical Review. A, Vol. 69, Issue 3; Other Information: DOI: 10.1103/PhysRevA.69.032501; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
AMERICIUM 241
BINDING ENERGY
COSTER-KRONIG TRANSITIONS
DECAY
EXCITATION
FLUORESCENCE
GAMMA RADIATION
GOLD
K SHELL
KEV RANGE
LI-DRIFTED SI DETECTORS
LUTETIUM
MERCURY
PHOTONS
RELATIVISTIC RANGE
RHENIUM
RUBIDIUM CHLORIDES
THALLIUM
TRANSITION RADIATION
TUNGSTEN
VACANCIES
X RADIATION
X-RAY SPECTRA
YIELDS
YTTERBIUM