Line shape analysis of the 60 keV M�ssbauer resonance in237Np: Interference effects

Asch, L.; Potzel, W.; Kalvius, G. M.; Spirlet, J.C.; Müller, W.

doi:10.1007/bf01021714

Cited by 13 publications

(5 citation statements)

References 23 publications

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“…8) (Fig. 21), which is consistent with the value reported for instance in Np02 (0D = 270Κ [5] 2) For a given sample, the relative spectral areas depend on the age, i.e. on the extent of self-irradiation defect accumulation proceeding during storage at 300 K. The proportion of the Np 4+ valence state increases from typically 32 to 45 % at the expense of the Np s + component (Fig.…”

Section: Radiation Effects In Actinide Materials After Effects Osupporting

confidence: 87%

“…The latter is defined by two independent parameters, i.e. the principal component = -- 5 ) and the asymmetry £ δ Z parameter (η = (q^ -q^ ) / q^), e is the charge of the proton; F(o) is the electrostatic potential at the nucleus. Within each nuclear level involved in the resonance, the hamiltonian of quadrupole interaction is written in a reference system of principal axes:…”

Section: Information Accessible To Mössbauer Spectroscopymentioning

confidence: 99%

“…With such methods, low temperature spectra can be accumulated over comparatively short durations hour) or else measurements can be preformed with small resonance intensity as encountered in temperature-dependent investigations up to nearly room temperature. For precise data analysis, and in particular in the case of unresolved hfi, the existence of a dispersion modification of the Lorentzian absorption lineshape must be considered [5].…”

Section: Reported Resonancesmentioning

confidence: 99%

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Mössbauer Spectroscopy in Actinide Research

Friedt¹

1983

Radiochimica Acta

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Actinide compounds /Mössbauer spectroscopy /Electronic structure /Crystal structure /Magnetism L Introduction Π. Information accessible to Mössbauer spectroscopy ΙΠ. Mössbauer spectroscopy in the actinide elements 1. Introduction 2. Reported resonances 3. Other possibilities IV.Electionic configuration, bonding and magnetic properties 1. Introductory survey of theoretical concepts 2. Chemical information from isomer shift data 3. Chemical information from electric field gradient data 4. Chemical information from magnetic hyperfine data V. Structural information: Crystallographic and magnetic phase transitions and structures VI. Radiation effects in actinide materials: After-effects of nuclear decays and of nuclear reactions; self-irradiation effects VII. Conclusions AbstractThe principles and possibilities of Mössbauer spectroscopy in actinide compounds are reviewed. A survey of applications of chemical character to problems of electronic structure, bonding properties, magnetism and phase transitions is given in order to illustrate the possibilities of Mössbauer spectroscopy. In particular, the recently very active problem of the elucidation of the type of phase transition occurring at low temperature in Np0 2 (~ 25 K) and Am0 2 ( ~ 10K) is discussed on the basis of recent experimental results using the 23 'Np and "'Am Mössbauer resonances. Problems connected with after-effects of nuclear decays, radiation damage and self-irradiation effects are emphasized with the aid of a series of new experimental results.

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Section: Radiation Effects In Actinide Materials After Effects Osupporting

confidence: 87%

Section: Information Accessible To Mössbauer Spectroscopymentioning

confidence: 99%

Section: Reported Resonancesmentioning

confidence: 99%

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Mössbauer Spectroscopy in Actinide Research

Friedt¹

1983

Radiochimica Acta

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“…They have studied the effect of absorber thickness and polarization of the absorber. Other investigations on line shapes include the effect of an external periodic perturbation of ultrasonic frequency on a source (316), the effect of the dispersion parameter in high precision data of 237Np Móssbauer spectroscopy (14), and the effect of inelastic scattering of the order-parameter fluctuation near phase transitions (346).…”

Section: Spectral Analysismentioning

confidence: 99%

“…Moser et al (222) obtained high pressure spectra of 151Eu and 119Sn in EuS and EuSe, observing the change with pressure of the Curie temperature. Nikolaev et al (233) determined the magnetic fields at Fe and Sn in FeSn2 up to 14 kbar. Both isotopes have similar T and p dependence.…”

Section: Catalysts and Surfacesmentioning

confidence: 99%