Studies on photon interaction around the K-edge of some rare-earth elements

Mallikarjuna, M. L.; Gowda, Shivalinge; Gowda, Ramakrishna; Umesh, T. K.

doi:10.1016/s0969-806x(02)00260-8

Cited by 38 publications

(23 citation statements)

References 8 publications

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“…Also, in the same table, the experimental upper and lower total attenuation cross sections are given along with the theoretical values of Scofield [35], WinXCOM [36] and the experimental values of Mallikarjuna et al [23]. A good agreement can be noticed among the present values of the upper and lower total attenuation cross section and the Scofield [35], WinXCOM [36] and the experimental values of Mallikarjuna et al [23].…”

Section: Resultssupporting

confidence: 69%

“…In Table 4, the experimental values of the K shell absorption jump ratio and jump factor are compared with the theoretically calculated values of Scofield [35] and WinXCOM [36], and with given earlier experimental values of Mallikarjuna et al [23], Ertuğrul et al [10], Budak et al [11] and Polat et al [18]. The determined values of absorption jump ratio and jump factor are lower than the theoretical values [35][36] and the other experimental values [23,10,11,18]. It is found that the obtained values of r K and J K are in good agreement with the theoretically calculated as well as the other experimental values within experimental uncertainties.…”

Section: Resultsmentioning

confidence: 99%

“…The determined K shell total attenuation cross sections at the K edge for each sample are given in Table 4 along with the theoretical values and the experimental values of the Mallikarjuna et al [23]. Also, in the same table, the experimental upper and lower total attenuation cross sections are given along with the theoretical values of Scofield [35], WinXCOM [36] and the experimental values of Mallikarjuna et al [23].…”

Section: Resultsmentioning

confidence: 99%

“…The oscillator strength g K indicates the number of electrons capable of oscillating with the natural frequency of the atom. Measurement of total interaction cross sections can also yield valuable information regarding the oscillator strengths [23]. The K shell oscillator strength is the probability of transition of the K shell electrons to all permissible states.…”

Section: Introductionmentioning

confidence: 99%

“…The K shell oscillator strength is the probability of transition of the K shell electrons to all permissible states. The total attenuation cross section of rare earth elements in a narrow good geometry in the energy range 6-85 keV were measured by Mallikarjina et al [23]. They were derived the K shell photo effect cross sections at the K edge τ K , the oscillator strength g K and the K jump ratio r K of the elements La, Ce, Pr, Nd, Sm, Gd, Dy, Ho and Er from total attenuation cross section.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Determination of K shell absorption parameters for some lanthanides using the X-ray attenuation method

2015

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The total attenuation cross section at the K edge, absorption jump ratio, jump factor, Davisson-Kirchner ratio and oscillator strength parameters for the K shell were determined by measuring the total attenuation cross sections around the K edge for Pr, Nd 2 O 3 and Sm. The measurements were performed in a secondary excitation geometry using the Kα 2 , Kα 1 , Kβ 1 and Kβ 2 X-rays (in the region from 31.817 to 55.293 keV) from different secondary source targets excited by the 59.54 keV γ-photons from an 241 Am annular source. It is the first time that the Davisson-Kirchner ratio values have been determined for present samples. The experimental results were compared with the theoretically calculated and other available experimental results.

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Section: Resultssupporting

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Determination of K shell absorption parameters for some lanthanides using the X-ray attenuation method

2015

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Dispersion corrections to the forward Rayleigh scattering amplitudes around the L‐shell of tantalum and lead

Gowda

Umesh

2006

X-Ray Spectrometry

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Dispersion corrections to the forward Rayleigh scattering amplitudes of tantalum and lead in the photon energy range 6.4–24.14 keV were determined by a numerical evaluation of the dispersion integral that relates them through the optical theorem to the photoelectric cross‐sections. The photoelectric cross‐sections were extracted by subtracting the coherent and incoherent scattering contribution from the measured total attenuation cross‐section, using a high‐resolution, high‐purity germanium detector in a narrow‐beam good geometry setup. The real part of the dispersion correction to which the relativistic corrections calculated by Kissel and Pratt (S‐matrix approach) or Creagh and McAuley (multipole corrections) have been included are in better agreement with the available theoretical values than those values to which the relativistic corrections calculated by Cromer and Liberman (dipole corrections) are added. Copyright © 2006 John Wiley & Sons, Ltd.

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Anomalous scattering factors of some rare earth elements evaluated using photon interaction cross-sections

et al. 2003

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The real and imaginary parts, f ¼´E µ and f ¼¼´E µ of the dispersion corrections to the forward Rayleigh scattering amplitude (also called anomalous scattering factors) for the elements La, Ce, Pr, Nd, Sm, Gd, Dy, Ho and Er, have been determined by a numerical evaluation of the dispersion integral that relates them through the optical theorem to the photoeffect cross-sections. The photoeffect cross-sections are derived from the total attenuation cross-section data set experimentally determined using high resolution high purity germanium detector in a narrow beam good geometry set-up for these elements in the photon energy range 5 to 1332 keV and reported earlier by the authors. Below 5 keV, Scofield's photoeffect cross-sections compiled in XCOM program have been interpolated and used. Simple formulae for f ¼¼ in terms of atomic number and energy have also been obtained. The data cover the energy region from 6 to 85 keV and atomic number Z from 57-68. The results obtained are found to agree fairly well with the other available data.

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Studies on photon interaction around the K-edge of some rare-earth elements

Cited by 38 publications

References 8 publications

Determination of K shell absorption parameters for some lanthanides using the X-ray attenuation method

Determination of K shell absorption parameters for some lanthanides using the X-ray attenuation method

Dispersion corrections to the forward Rayleigh scattering amplitudes around the L‐shell of tantalum and lead

Anomalous scattering factors of some rare earth elements evaluated using photon interaction cross-sections

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