THE ISOMER SHIFT VALUES OF IMPLANTED /<sup>133</sup>Xe/<sup>133</sup>Cs IN VARIOUS HOSTS

Dézsi, I.; Coussement, R.; Langouche, Guido; Pattyn, Hugo; Reintsema, S. R.; Rossum, M. Van; Bruyn, J.

doi:10.1051/jphyscol:19792200

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“…From the systematic isomer-shift studies on 133 Cs, it is unlikely to find isomer shifts larger than ϩ0.1 mm/s with respect to a CsCl absorber. [1][2][3]11 Moreover, Campbell, Montet, and Perlow 12 have shown that the quadrupole splitting e 2 qQ ex (Q ex ϭ Ϫ0.22 barn͒ of the 81 keV ͑ 5/2 ϩ ) state in 133 Cs is not negligible; it can be measured by Mössbauer spectroscopy for sufficiently large field gradients. Thus, the line at positive velocity in the spectrum belongs to a quadrupole triplet which has a reasonable isomer shift.…”

Section: Experimental Results and Data Analysismentioning

confidence: 99%

Calibration and interpretation of Mössbauer isomer shift of the 81-keV transition in133Cs

et al. 1998

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Radioactive 133 Xe was implanted into five host materials ͑Al, V, Cr, Rh, Mo͒ by means of an isotope separator. Internal conversion electron spectra of the 81-keV transition in 133 Cs were measured with an iron-free magnetic spectrometer and Mössbauer spectra were recorded independently. From the correlation between the weighted-mean Mössbauer isomer shifts and the intensity ratios of (Oϩ P)-shell to N 1 -shell conversion electrons, the change of the nuclear charge radius of the 81-keV transition in 133 Cs was deduced to be ⌬R/Rϭϩ(1.5Ϯ0.5)ϫ10 Ϫ4 for a uniform charge distribution of Rϭ1.2ϫA 1/3 fm or, equivalently, ⌬͗r 2 ͘ ϭϩ(6.6Ϯ2.4)ϫ10 Ϫ3 fm 2 . This calibration makes it possible to reasonably interpret the extremely high isomer shifts observed in some refractory metals implanted with 133 Xe, where we take into consideration an increase in s-electron density originated from a decrease in the shielding effect on the s electrons by a removal of the 5 p electron from the Cs impurity atom, which is attributed to the broadening of the valence band with compression and the resulting increase in overlap between the host and the impurity valence bands.

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Section: Experimental Results and Data Analysismentioning

confidence: 99%

Calibration and interpretation of Mössbauer isomer shift of the 81-keV transition in133Cs

et al. 1998

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“…Three more experiments can be quoted to support this assignment. First, an implantation of 133Xe in pyrolytic graphite yields a single absorption line at 0.03 ± 0.05 mm/s [47]. Moreover, we have performed a hot implantation of 133Xe at 1014 at/cin2 and 600°C; we also did a room temperature implantation at the same dose, followed by thermal annealing in vacuo « 2 x 10-' torr) at 1 100 OC.…”

Section: Laser and Thermal Annealing Of Te-implantedmentioning

confidence: 99%