A Counter with Selective Efficiency for Recording the Recoilless γ-Rays of Sn119

Mitrofanov, K.P.; Illarionova, N. V.; Shpinel, V.S.

doi:10.1007/978-1-4899-4848-9_3

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…This value is close to 1.47 , advanced in [5], where a heuristic approach has been given based the calculation of the transmission integral. Also in [5], experiments are presented where this narrowing was confirmed using 119 Sn. More recently this narrowing has been observed [6] again with 119 Sn.…”

Section: Solution Of the Equationssupporting

confidence: 60%

Enhanced resolution in Mössbauer spectroscopy

Odeurs

Hoy

Labbé

2000

J. Phys.: Condens. Matter

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Using a resonant detector in Mössbauer spectroscopy can result in a spectral linewidth that is 1.46 , where is the linewidth of the excited-state nuclear level. As is well known, the minimum linewidth obtained in conventional Mössbauer experiments is 2 . The quantum mechanical calculation using a nuclear resonant detector, which predicts this result, is presented. The fundamental equations describing the system are solved by means of perturbation theory in the frequency domain. The model system is taken to consist of a source nucleus, an absorber nucleus, and the resonant-detector nucleus. As noted, the minimum linewidth obtained in a Mössbauer spectrum taken under these conditions is found to be appreciably smaller than the linewidth obtained in a conventional Mössbauer set-up. Thus the conversion-electron, resonant-detector scheme may be used to advantage in experiments requiring the highest possible energy resolution.

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Section: Solution Of the Equationssupporting

confidence: 60%

Enhanced resolution in Mössbauer spectroscopy

Odeurs

Hoy

Labbé

2000

J. Phys.: Condens. Matter

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“…One has to keep in mind that with this special setup of the resonant detector, the minimum experimental linewidth is the convential Mössbauer linewith of 2⌫ 0 -hence it is not lowered to 1.47⌫ 0 as is the usual case when measuring with a resonant detector. 13 This is caused by the fact that the detector is not used in resonance but rather as a very selective counter for the radiation coming from the 119 Sn Mössbauer transition.…”

Section: Methodsmentioning

confidence: 99%

Extreme lowering of the Debye temperature of Sn nanoclusters embedded in thermally grownSiO2by low-lying vibrational surface modes

et al. 2004

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The formation and dynamical behavior of Sn clusters embedded in amorphous, thermally grown SiO 2 layers, formed by ion implantation, is monitored through 119 Sn Mössbauer spectroscopy. We observe an extreme decrease of the cluster Debye temperature D for samples annealed at 800°C in a reducing atmosphere. We show with a model, based on classical elasticity theory, that this lowering can be explained by a decrease of the surface vibrational modes when a Sn microcrystal is embedded in a SiO 2 matrix.

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“…Hence, one has to take into account perturbations of the line shape due to the secondary (and eventually higher order) fields [4,5]. Therefore additional contribution to the line shape emerges and it resembles similar effects observed by using resonant detectors in the transmission geometry [3,[6][7][8] except dispersion terms, the latter being absent in the transmission geometry for the low energy M1 transitions. Some part of the secondary (and higher order) resonant field is coherent with the original field coming from the external source [9][10][11].…”

Section: Introductionmentioning

confidence: 73%

“…However high precision transmission data exhibit usually slightly broader external lines (1,6) in comparison with the pair (2,5), and the latter pair is often slightly broader than the innermost pair (3,4). This effect is due to the finite primary beam divergence.…”

Section: Case Of Metallic Ironmentioning

confidence: 99%

Secondary Radiation Field Effects for the CEM Spectra

2010

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The secondary resonant radiation field and resonant absorption thickness effects on the Conversion Electron Mössbauer Spectroscopy spectra are analyzed for highly enriched resonant targets. It is shown that secondary field effect is important for the thick α-Fe foil enriched in the resonant isotope. Even for the polycrystalline sample traces of the coherent resonant field have been detected as the distortion of lines. Secondary field is discussed in detail. Suitable approximations to treat spectra originating from targets with significant resonant thickness developing secondary field composed of the incoherent and coherent parts are introduced. Finally, the formalism is applied to the high quality spectrum recorded for the enriched iron foil and correlation between contribution due to the secondary field and experimental line shape is investigated.

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A Counter with Selective Efficiency for Recording the Recoilless γ-Rays of Sn119

Cited by 4 publications

References 3 publications

Enhanced resolution in Mössbauer spectroscopy

Enhanced resolution in Mössbauer spectroscopy

Extreme lowering of the Debye temperature of Sn nanoclusters embedded in thermally grownSiO2by low-lying vibrational surface modes

Secondary Radiation Field Effects for the CEM Spectra

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