Zobrazeno 1 - 10
of 26
pro vyhledávání: '"U. Karfunkel"'
Publikováno v:
Hyperfine Interactions. 112:193-196
Metal inclusions in synthetic MDAS diamond grits were investigated by Mossbauer spectroscopy as a function of the grit size. The larger grit sizes show a nicely developed sextet, which collapses to a paramagnetic singlet with decreasing grit size. Th
Publikováno v:
Hyperfine Interactions. 94:2355-2360
The physical changes occurring at 475 °C in an Nb and Al stabilized stainless steel containing 38 wt.% Cr have been studied by Mossbauer spectroscopy. The specimen started to decompose when held at 475 °C. Decomposition still continues after 500 ho
Autor:
H. Pollak, U. Karfunkel
Publikováno v:
Hyperfine Interactions. 77:235-254
Mossbauer data at various temperatures down to 4.6 K, together with wet chemical analysis and neutron activation analysis, enabled us to determine the site occupancies of iron and magnesium, and the ratio of the recoil-free fractions of ferric and fe
Autor:
H. Pollak, U. Karfunkel
Publikováno v:
physica status solidi (b). 180:67-72
A new approach to the analysis of Mossbauer spectra for garnets with mixed valence iron is made. Values for the recoil-free fraction ratios are extracted and a more acceptable approximation procedure is obtained for the derivation of the Fe(3+)/Fe(2+
Publikováno v:
Physica Status Solidi (a). 134:67-76
Crocidolite is a fibrous variety of riebeckite which is a member of the amphibole family of minerals. A careful alignment of the fibres parallel to one another from a specimen of Cape blue crocidolite forms a pseudo single crystal. The Mossbauer spec
Publikováno v:
Materials Science and Engineering: B. 11:243-248
Secondary-electron emission used to characterize the band structure of diamond is found to verify the electronic structure of and homoepitaxial and polycrystalline films grown by low pressure chemical vapour deposition (LPCVD) on various silicon subs
Publikováno v:
Radiation Effects and Defects in Solids. 116:233-252
This contribution examines the influence of nitrogen impurity on the radiation detecting properties of synthetic diamonds. The relatively low sensitivity of the commonly available synthetic diamonds, when used as dosimeters/detectors, is attributed t
Autor:
U. Karfunkel, M. C. Stemmet
Publikováno v:
Lettere Al Nuovo Cimento Series 2. 18:287-290
HunY et al. (~) introduced a paramctr izat ion system for the description of angularcorrelation measurements following (d, py) str ipping reactions. Although it was mainly used in the context of spin-independent distorted-wave Born approximation (DWB
Autor:
U. Karfunkel, M.C. Stemmet
Publikováno v:
Nuclear Instruments and Methods. 130:527-531
A new method is described by which the measurement of the absolute particle-gamma angular correlation function is made possible. It is used to derive the distortion parameter λ in stripping reactions. The method involves measurements restricted to t
Publikováno v:
Nuclear Physics A. 136:145-152
The attenuated Doppler-shift method has been used to measure the lifetimes of the first two excited states in 29 P produced in the 28 Si(p, γ) reaction. The measurements were analysed using theoretical stopping cross sections. Values of 285±80 fs a