Publications database

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2017-07-20
13:39
[PUBDB-2017-08063] Journal Article

On the Peak Profiles in Energy-Dispersive Powder X-ray Diffraction with Synchrotron Radiation
ddc:540
The peak profiles of standard reference materials have been investigated with energy-dispersive X-ray diffraction at a synchrotron source. Keeping the detector dead time below 2%, the peak profiles were essentially pure Gaussians independent of energy in the range investigated. [...]
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2017-07-20
13:30
[PUBDB-2017-08062] Journal Article
; ; ; et al
X-ray absorption fine structure of rare earth doped (La,Sr)$_2$CuO$_4$
Physica / C 299(3-4), 191 - 196 (1998) [10.1016/S0921-4534(98)00020-3]  GO
ddc:530
The local structure around the Cu atoms in rare earth (RE) doped (La,Sr)2CuO4 has been studied by means of measuring the X-ray absorption fine structure (XAFS) at the Cu K-edge. On the local scale the tilting angle of the oxygen octahedra surrounding a Cu atom depends on the Sr and RE content. [...]
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2017-07-20
13:29
[PUBDB-2017-08061] Journal Article
; ; ; et al
Epitaxial clusters studied by synchrotron X-ray diffraction and scanning tunneling microscopy
ddc:530
Nanoscale clusters are often formed during heteroepitaxial crystal growth. Misfit between the lattice parameter of the substrate and the adsorbate stimulates the formation of regular clusters with a characteristic size. [...]
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2017-07-20
13:27
[PUBDB-2017-08060] Journal Article
; ; ; et al
The structure of molten ZnCl$_2$
ddc:660
High energy photon diffraction measurements on molten ZnCl2 have been carried out in the temperature range 623–853 K. The momentum transfer range covered is 0.15 Å−1<Q<21.6 Å−1. [...]
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2017-07-20
13:16
[PUBDB-2017-08058] Journal Article
; ; ; et al
Excitonic and recombination processes in CaWO$_4$ and CdWO$_4$ scintillators under synchrotron irradiation
ddc:530
Excitation spectra of intrinsic (IL) and extrinsic luminescence (EL) from CaWO4 and CdWO4 crystals, measured using synchrotron radiation (4–30 eV) at 8 K, have been analysed. In CaWO4 the IL (2.9 eV) is efficiently excited by photons of 5.5–7.0 eV at the creation of molecular excitons. [...]
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2017-07-20
13:13
[PUBDB-2017-08057] Journal Article
; ; ; et al
Observation of nano-dewetting structures
epl 40(6), 655 - 660 (1997) [10.1209/epl/i1997-00519-4]  GO
ddc:530
We have studied the dewetting of thin polymer films (polystyrene) on top of different silicon substrates. With diffuse X-ray scattering and scanning-force microscopy a high in-plane resolution was achieved. [...]
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2017-07-20
12:55
DBCoverage [PUBDB-2017-08054] Report/Journal Article

Half Integer Charged Hadrons From Higher Dimensions?
[DESY-85-122] ddc:530
Certain embeddings of the low energy SU(3) C × SU(2) L × U(1) Y gauge group within the higher dimensional symmetry lead to exotic chiral generations in addition to a number of standard generations. An example is studied, leading to an anomaly free chiral exotic generation consisting of quarks with electric charge + 1 6 and − 5 6 , the corresponding antiquarks and addition integer charged leptons. [...]
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2017-07-20
12:52
DBCoverage [PUBDB-2017-08052] Report/Journal Article
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Kaluza-Klein Solutions With Noncompact Internal Spaces
[BUTP-85-21-BERN] ddc:530
Einstein's equations with a cosmological constant in arbitrary dimensions admit solutions with unobservable internal space and flat four-dimensional space. Internal space is non-compact, has finite volume and admits a compact group of symmetries. [...]
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2017-07-20
12:49
DBCoverage [PUBDB-2017-08051] Report/Journal Article

Correlations and Static Energies in the Standard Higgs Model
[DESY-85-005] ddc:530
Correlations in the W-boson and Higgs boson channels and the static energy of an external SU(2) doublet charge pair are investigated by Monte Carlo calculations in the SU(2) lattice gauge theory with a scalar Higgs doublet field. The mass ratio m W / m H and the shape of the static potential are used to obtain information on the renormalization group trajectories in the three-dimensional coupling constant space. [...]
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2017-07-20
12:48
[PUBDB-2017-08050] Report/Journal Article

Volume Dependence of the Energy Spectrum in Massive Quantum Field Theories. 1. Stable Particle States
[DESY-85-144] ddc:530
Due to polarization effects, the massM of a stable particle in a quantum field theory enclosed in a large (space-like) box of sizeL and periodic boundary conditions in general differs from its infinite volume valuem. AsL increases, the finite size mass shift Δm =M−m goes to zero exponentially with a rate, which depends on the particle considered and on the spectrum of light particles in the theory. [...]
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