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'Time Differential Perturbed Angular Correlations TDPAC' in keywords
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2000 (3)
1996 (1)
1Author    T. ButzRequires cookie*
 Title    Nuclear Quadrupole Interactions Studied by Time Differential Perturbed Angular Correlations of y-Rays  
 Abstract    This paper gives an elementary introduction to time differential perturbed angular correlation of y-rays emitted from excited nuclei with particular reference to nuclear quadrupole interactions. We start with a comparison to other techniques such as nuclear quadrupole resonance and the Mössbauer effect, quote all necessary formulae, describe a typical spectrometer, list suitable iso-topes, and finally give some examples for modern applications. 
  Reference    Z. Naturforsch. 51a, 396—410 (1996); received December 12 1995 
  Published    1996 
  Keywords    Nuclear quadrupole interactions, Time differential perturbed angular correlations (TDPAC), TDPAC: theory, spectrometers, isotopes, Mercury compounds, Tungsten compounds 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0396.pdf 
 Identifier    ZNA-1996-51a-0396 
 Volume    51 
2Author    M. Marszałek, Jerzy Grębosz, Jacek Jaworski, Zbigniew Stachura, Mirosław Ziębliński, Bernd Sulkio-ClefpRequires cookie*
 Title    The 8-Parameter List Mode for 7-7 Perturbed Angular Correlation Measurements  
 Abstract    A new TDPAC spectrometer which is based on the principle of event by event data acquisition (list mode) in order to reduce a background, avoid systematic errors and increase efficiency of the setup is described. The principal demand on the new spectrometer is the simultaneous measurement of all events containing the time and energy signals of the four detectors appearing in a preset common time window. For this purpose an 8-parameter list mode data acquisition system has been developed. 
  Reference    Z. Naturforsch. 55a, 74—78 (2000); received September 11 1999 
  Published    2000 
  Keywords    Time Differential Perturbed Angular Correlations (TDPAC), Spectrometers, List Mode, Event by Event, Data Acquisition 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0074.pdf 
 Identifier    ZNA-2000-55a-0074 
 Volume    55 
3Author    N. Ulbrich, W. Tröger, T. Butz, P. Blaha, Nukleare FestkörperphysikRequires cookie*
 Title    Investigation of the Negative Thermal Expansion of ZrW 2 O g  
 Abstract    The negative thermal expansion in ZrW 2 0 8 was investigated on a microscopic scale by temperature dependent measurements of the electric field gradients at the nuclear probe 187 W (ß~) 187 Re using time differential perturbed angular correlation spectroscopy. Two distinct nuclear quadrupole interactions I VJ? cl l= 18.92(4) • 10 21 V/m 2 , q Rcl = 0.0 and I V5 e2 l = 4.55(2) • 10 21 V/m 2 , r? Re2 = 0.053(3) were observed at 295 K, which are assigned to the two crystallographically distinct W0 4 tetrahedra of the room temperature structure. Ab initio calculations of electron densities and electric field gradients with 1:7 Re-impurities using the full potential linearized augmented plane wave package WIEN97 yield the electric field gradients VJ? C| = 12.63 • 10 21 V/m 2 ,7y Rcl = 0.0 and vJ? e2 =4.90 • 10 21 V/m 2 , rj Re2 =0.0. The observed temperature dependence of the nuclear quadrupole interactions agrees well with the structu-ral phase transition at 428 K observed by neutron and x-ray diffraction. Our experiments corroborate the suggested mechanism of coupled librations of rigid Zr0 6 octahedra and W0 4 tetrahedra, which is an alternative description of transverse vibrations of oxygen atoms in Zr-O-W bonds, for the negative thermal expansion in ZrW 2 0 8 . 
  Reference    Z. Naturforsch. 55a, 301—310 (2000); received October 28 1999 
  Published    2000 
  Keywords    ZrW 2 0 8, Negative Thermal Expansion, Phase Transition, Time Differential Perturbed Angular Correlation (TDPAC), Hyperfine Spectroscopy 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0301.pdf 
 Identifier    ZNA-2000-55a-0301 
 Volume    55 
4Author    Z. Z. Akselrod, D. V. Filossofov, J. Buša, T. Bušova, O. I. Kochetov, N. A. Lebedev, A. F. Novgorodov, V. N. Pavlov, A. V. Salamatin, E. N. Shirani, V. V. TimkinRequires cookie*
 Title    Cd Time Differential Perturbed Angular Correlation Studies of High Specific Activity m In-Aqueous Solutions  
 Abstract    Time-differential PAC measurements have been made using the high specific activity of 111 In, both in aqueous solutions of the C10~ 4 , NO~ 3 and CP at pH values between 1.0 and 9 and temperatures between 186 and 293 K. 
  Reference    Z. Naturforsch. 55a, 151—154 (2000); received August 23 1999 
  Published    2000 
  Keywords    "'in, m Cd, High Specific Activity, Nuclear Quadrupole Interaction (NQI), Time Differential Perturbed Angular Correlation (TDPAC) 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0151.pdf 
 Identifier    ZNA-2000-55a-0151 
 Volume    55