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Sergeenkov, Yu.V.
Proceedings of the 9th International Symposium on Capture gamma-ray spectroscopy and related topics. Vol.11997
Proceedings of the 9th International Symposium on Capture gamma-ray spectroscopy and related topics. Vol.11997
AbstractAbstract
[en] The distribution of energies of low-lying levels of odd-A nuclei from Ag to Ba is analysed. It is shown that this distribution for most levels considered has a discrete character with parameter of multiplicity lying in the range 20-50 keV which varies from nucleus to nucleus. (author)
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Molnar, G.L.; Belgya, T.; Revay, Zs. (eds.); [506 p.]; ISBN 963-7775-55-2;
; 1997; p. 278-279; Springer; Budapest (Hungary); Capture gamma-ray spectroscopy and related topics; Budapest (Hungary); 8-12 Oct 1996; 2 refs.

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[en] We present a detailed Moessbauer study of a series of Au and Pt particles in the size range from 1 to 17 nm. All measured spectra can be explained consistently with a refined model, in which the Moessbauer isomer shift varies in the inner core of a small metallic particle due to size effects. The large surface/volume ratio makes surface effects, like screening of considerable importance and even the so-called quantum-size effect may have an influence. The size evolution of the electronic properties of the particles is also discussed
Source
International conference on the applications of the Moessbauer effect (ICAME); Garmisch (Germany); 29 Aug - 3 Sep 1999; Copyright (c) 2000 Kluwer Academic Publishers; Country of input: International Atomic Energy Agency (IAEA)
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[en] 197Au Moessbauer spectra from Au/TM (TM = Fe, Co, Ni) multilayers consist mainly of two components. One component shows a large hyperfine magnetic field due to the hybridization at the interface between Au and ferromagnetic layers. The other component is nonmagnetic arising from the middle part of the Au layers. From the fractional area of the magnetic components in each spectrum, the Au atoms in 0.4 nm Au layers are perturbed by the Fe and Ni layers, and Co layers perturb 0.3 nm Au layers at the interface
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Copyright (c) 1998 Kluwer Academic Publishers; Country of input: International Atomic Energy Agency (IAEA)
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Devarani Devi, Ksh.; Gargari, S.; Joshi, R.
Proceedings of the seventh DAE-BRNS Indian particle accelerator conference: book of abstracts2015
Proceedings of the seventh DAE-BRNS Indian particle accelerator conference: book of abstracts2015
AbstractAbstract
[en] A low energy negative ion implanter facility had been developed at IUAC. The typical ion energies of this facility are in the range of 30 KeV to 200 KeV. It is capable of delivering ion species having masses "1H to "1"9"7Au. The facility is equipped with a sputter base negative ion source namely MC- SNICS (multi cathode -source of negative ion by cesium sputtering) placed on a high voltage platform (200 kV) for generating negative ion beams. The beam line essentially consists of a negative ion source, an accelerating column, focusing devices such as electrostatic quadruple triplets, an analyzer magnet for selecting the particular ion beam as well as transporting in a particular direction and finally, an ion implantation chamber. The analyzer magnet has a maximum rigidity, R =mE/Z"2 of 34 (where m- mass in a.m.u., E- energy in MeV, Z- charge state) thereby, it restricts the energies of the higher mass ions at 150 keV. The ion beam optics for this facility was calculated using GIOS and GICOSY software codes. The control system used for its operation is indigenously developed. The optimized or minimum ion beam spot size obtained is 5 mm x 5 mm (but, variable with ion energy and mass). An electrostatic scanner placed in front of the implantation chamber allows a uniform ion implantation on the samples of sizes up to 15 mm x 15 mm. The facility is in regular operation for ion implantation purposes especially for material science experiments. (author)
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Mathew, Jose V.; Singh, Sudheer Kumar; Gupta, Shrikrishna (Ion Accelerator Development Division, Bhabha Atomic Research Centre, Mumbai (India)) (comps.); Bhabha Atomic Research Centre, Mumbai (India); Indian Society for Particle Accelerators, New Delhi (India); 352 p; 2015; p. 209; InPAC-2015: 7. DAE-BRNS Indian particle accelerator conference; Mumbai (India); 21-24 Dec 2015
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Herber, R.H.; Stoeckler, H.A.
Applications of the Moessbauer effect in chemistry and solid-state physics1966
Applications of the Moessbauer effect in chemistry and solid-state physics1966
AbstractAbstract
[en] As with the k-capture, γ-emission decay of 57Co, the chemical consequences of the isomeric decay of 119Snm can be investigated by the techniques of Moessbauer spectroscopy. The de-excitation of the 245-d 11/2-state occurs by the emission of 65.3-keV (M4) and 23.8-keV (M1-E2) γ-radiation in cascade. Three major chemical effects of nuclear transformations that can be investigated by Moessbauer techniques are: (a) consequences of the 118Sn(n, γ)119Snm process and effects of the concomitant γ-radiation during pile exposure; (b) recoil effects accompanying the M4 decay; and (c) effects of internal conversion of the M4 decay. These effects have been studied in stannic oxide metallic (grey) tin, and tetraphenyl tin, each labelled with the nuclide 119Sn111
Source
International Atomic Energy Agency, Vienna (Austria); Technical reports series; No. 50; 267 p; Mar 1966; p. 226-227; IAEA; Vienna (Austria); Panel on applications of the applications of the Moessbauer effect in chemistry and solid-state physics; Vienna (Austria); 26-30 Apr 1965; Since this paper has been published in Chemical Effects of Nuclear Transformations II, IAEA, Vienna (1965) 403, only the abstract is printed.
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Zhao, J. Y.; Toellner, T. S.; Hu, M. Y.; Sturhahn, W.; Alp, E. E.; Shen, G. Y.; Mao, H. K.
Argonne National Lab., IL (United States). Funding organisation: US Department of Energy (United States)2001
Argonne National Lab., IL (United States). Funding organisation: US Department of Energy (United States)2001
AbstractAbstract
No abstract available
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7 Sep 2001; [vp.]; SRI 2001: Synchrotron Radiation Instrumentation Conference; Madison, WI (United States); 22-24 Aug 2001; W-31-109-ENG-38; Available from Rev. Sci. Instrum. 73(3): 1608-10 Mar. 2002
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[en] With the aim of calibrating Moessbauer spectroscopic measurements, the electric-field gradient and electron contact density is calculated on the Sn nuclear position in a number of Sn compounds representing all kinds of chemical bonding in solids. The full-potential linear-muffin-tin-orbitals method with the local-density approximation for exchange and correlation effects is used. By comparison with experimental 119Sn Moessbauer data the calibration constants relating measured isomer shifts and quadrupole splittings to the electron contact density and the electric-field gradient, respectively, are derived. The difference between the mean square radius of the 119Sn Moessbauer nucleus in its excited isomeric and ground states is found to be Δ left-angle r2 right-angle=(0.0072±0.0002) fm2, while the quadrupole moment of the excited 119Sn(24 keV,3/2+) nuclear state is obtained as |Q|=(12.8±0.7) fm2. The larger database considered and the use of a more accurate band-structure calculational scheme than in earlier works makes these numbers more accurate and provides improved calibration for Moessbauer spectroscopy. copyright 1997 The American Physical Society
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[en] Highlights: • A new nuclear quadrupole moment value is determined for xenon. • Four-component calculations with the recently developed RPF-4Z sets are used. • This is indicated as the reference value based on the high level calculations done. This study provides a new determination of the nuclear electric quadrupole moment (NQM) for 131Xe, which is achieved by the molecular method. Dirac-Coulomb Coupled Cluster calculations with a Gaunt correction (DC+G-CC) of electric field gradients (EFGs) and experimental nuclear quadrupole coupling constants of six molecular systems (XeH+, XeCuF, XeCuCl, XeAgF, XeAgCl and XeAuF) were considered. The best NQM obtained by our DC+G-CCSD-T EFGs was −114.6(1.1) mbarn, which is recommended as the new reference value for this nuclide given the high level electron structure calculations done here.
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S0009261416305966; Available from http://dx.doi.org/10.1016/j.cplett.2016.08.031; Copyright (c) 2016 Elsevier B.V. All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Goossens, A.; Craje, M. W. J.; Kraan, A. M. van der; Zwijnenburg, A.; Makkee, M.; Moulijn, J. A.; Grisel, R. J. H.; Nieuwenhuys, B. E.; Jongh, L. J. de, E-mail: a.goossens@iri.tudelft.nl2002
AbstractAbstract
[en] We report on a 197Au Moessbauer study of several types of supported gold catalysts. Differences in particle size show up in the Moessbauer spectra by a change in the relative weight of the spectral contribution of the surface atoms. The presence of ionic gold in active gold catalysts is not observed. The spectra can be interpreted in terms of bulk-like contributions from the inner-core atoms plus contributions from the outermost atoms at the surface of the particles.
Source
Copyright (c) 2002 Kluwer Academic Publishers; Country of input: International Atomic Energy Agency (IAEA)
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Saxena, Sunil; Wong-Foy, Annjoe; Moule, Adam J.; Seeley, Juliette A.; McDermott, Robert; Clarke, John; Pines, Alexander
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (United States). Funding organisation: USDOE Director, Office of Science. Office of Basic Energy Studies. Division of Materials Sciences (United States)2001
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (United States). Funding organisation: USDOE Director, Office of Science. Office of Basic Energy Studies. Division of Materials Sciences (United States)2001
AbstractAbstract
No abstract available
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LBNL--47909; AC03-76SF00098; Journal Publication Date: Aug. 22, 2001
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