K. Freitag
University of Bonn
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Featured researches published by K. Freitag.
European Physical Journal A | 1980
P. Herzog; K. Freitag; M. Reuschenbach; H. Walitzki
The 48.7 m111mCd activity was implanted in Zn and Be single crystals which were soldered to the cold finger of a dilution refrigerator and kept below 0.2 K during implantation. Subsequent nuclear orientation experiments allowed the determination of the quadrupole interaction frequencyvQ of the 11/2− isomeric state of111Cd in Zn and Be as −139 (15) MHz and +43(16) MHz respectively. With these results we derive the quadrupole moment of the 5/2+ 245 keV level of111Cd including sign asQ = +0.83(13) b and the sign of the electric field gradient for Cd in Be. The half-life of111mCd was redetermined as 48.67 (6) m.
Nuclear Instruments and Methods | 1978
P. Herzog; H.-R. Folle; K. Freitag; A. Kluge; M. Reuschenbach; E. Bodenstedt
A system for low temperature nuclear orientation studies is presented where the sample can be prepared by in situ implantation of ions from an isotope separator into a host lattice at temperatures <0.5 K. The special construction of the cryostat necessary for this purpose as well as the beam line from the isotope separator to the cryostat are described in detail. A description of the data acquisition arrangement appropriate to the experiments planned is given. The cooling characteristics of the refrigerator under different operating conditions are discussed. A first successful nuclear magnetic resonance experiment on oriented 197mHg implanted in situ at T<0.5 K is reported.
European Physical Journal A | 1983
P. Herzog; H. Walitzki; K. Freitag; H. Hildebrand; K. Schlösser
Abstract205,207Po have keen implanted with an isotope separator on-line into cold host matrices of Fe, Ni, Zn and Be. Nuclear magnetic resonance of oriented207Po has been observed in Fe and Ni, of205Po in Fe. The resonance frequencies for zero external field are
Nuclear Physics | 1993
B. Ackermann; H. Baltzer; C. Ensel; K. Freitag; V. Grafen; C. Günther; P. Herzog; J. Manns; M. Marten-Tölle; U. Müller; J. Prinz; I. Romanski; R. Tolle; J. deBoer; N. Gollwitzer; H.J. Maier
Materials Science and Engineering B-advanced Functional Solid-state Materials | 1999
E. Alves; M.F. da Silva; J.G. Marques; J. C. Soares; K. Freitag
\begin{gathered} v_L (^{207} Po\underline {Fe} ) = 575.08(20)MHz \hfill \\ v_L (^{207} Po\underline {Ni} ) = 160.1(8)MHz \hfill \\ v_L (^{205} Po\underline {Fe} ) = 551.7(8)MHz. \hfill \\ \end{gathered}
European Physical Journal B | 1986
P. Herzog; U. Dämmrich; K. Freitag; C. D. Herrmann; K. Schlösser
Hyperfine Interactions | 1975
E. N. Kaufmann; K. Krien; J. C. Soares; K. Freitag
From the dependence of the resonance frequency on external magnetic field theg-factor of207Po was derived as
Hyperfine Interactions | 1975
J. C. Soares; K. Krien; K. Freitag
Hyperfine Interactions | 1975
K. Krien; J. C. Soares; K. Freitag; R. Vianden; A.G. Bibiloni
g(^{207} Po) = + 0.31(22).
Hyperfine Interactions | 1999
J. Bartels; K. Freitag; J.G. Marques; J.C. Soares; R. Vianden