Affiliations: Department of Physics, Faculty of Arts and Sciences,
Ağrı İbrahim Çeçen University,
Ağrı, Turkey | Department of Physics, Faculty of Sciences,
Atatürk University, Erzurum, Turkey
Note: [] Corresponding author: I. Han,
Department of Physics, Faculty of Arts and Sciences,
Ağrı İbrahim Çeçen University, 04100 Ağrı, Turkey. Tel.: +90 4422314083; Fax: +90
4422360948; E-mail: [email protected], [email protected]
Abstract: L_{3}-subshell alignment of Th and U ionized by
59.5 keV photons has been investigated by evaluating the angular dependence of
L_{i} (i=l, α, η, β and γ) X-ray lines.
The angular dependence measurements were performed by measuring the
fluorescence cross section, σ_{Li} (i=1, η,
α, β and γ) and
σ_{Ll}/σ_{Lγ},
σ_{Lη}/σ_{Lγ },
σ_{Lα}/σ_{Lγ }
and σ_{Lβ}/σ_{Lγ}
ratios at different angles. It was observed from the measurements that
L_{i} (i=l and α) X rays for the
L_{3}-subshell depended on the emission angle and had an
anisotropic spatial distribution. On the other hand, there was no dependence of
emission angle and any significant anisotropy for other L X rays. The both Ll
and Lα X-rays originate from the filling of vacancies in states
L_{3}-subshell with J =3/2. The results of measurements
indicate that the L_{3}-subshell vacancy states with J = 3/2
are aligned, whereas L_{1}, and L_{2}
vacancy states with J =1/2 are non-aligned. Integral cross-sections for the
L_{i} (i=l, η, α, β and γ) X-rays and L
subshell fluorescence yields ω_{i} (i= 1, 2 and 3)
were also determined and results were compared with theoretically calculated
values and results of others and fairly good correspondence was observed.
