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A detection of-rays from Mkn 421 at energies above 1 TeV is reported, based on observations made in December 1994-May 1995 with the rst two HEGRA Cherenkov telescopes. From the image analysis, 111 excess gamma candidates are obtained from the 26 h Telescope #1 (CT1) dataset (signiicance 4.0) and 218 from the 41 h Telescope #2 (CT2) dataset (signiicance 4.2)(More)
A detection of TeV γ-rays from Mkn 501 is reported , based on observations made between March and August 1996 with the first HEGRA Cherenkov telescope (CT1). From the image analysis, 351 excess candidate γ-ray events are obtained from the 147 h dataset. The statistical significance of the excess is 5.2 σ. The average excess rate is 2.4 ± 0.5 h −1 above the(More)
Evolution in orientation space of copper upon plastic deformation showing the development of coarse grains into texture as measured with synchrotron high energy X-rays. The color coded intensity distribution on the 111 Debye-Scherrer ring is plotted as a function of azimuthal angle and time respectively along the horizontal and vertical axis. The background(More)
Nanolaminates such as the M(n + 1)AX(n) (MAX) phases are a material class with ab initio derived elasticity tensors published for over 250 compounds. We have for the first time experimentally determined the full elasticity tensor of the archetype MAX phase, Ti(3)SiC(2), using polycrystalline samples and in situ neutron diffraction. The experimental elastic(More)
A search for gamma-ray bursts (GRBs) above 20 TeV within the eld of view (1 sr) of the HEGRA AIROBICC Cherenkov array (29 N, 18 W, 2200 m a.s.l.) has been performed using data taken between March 1992 and March 1993. The search is based on an all sky survey on four time scales, 10 seconds, 1 minute, 4 minutes, and 1 hour. No evidence for TeV-emission has(More)
A novel 2 detector geometry for small-angle neutron scattering (SANS) applications is presented and its theoretical performance evaluated. Such a novel geometry is ideally suited for a SANS instrument at the European Spallation Source (ESS). Motivated by the low availability and high price of 3 He, the new concept utilizes gaseous detectors with 10 B as the(More)
The full triaxial stress state within individual particles in a monodisperse spherical granular assembly has been measured. This was made possible by neutron imaging and computed tomography combined with neutron diffraction strain measurement techniques and associated stress reconstruction. The assembly in question consists of 549 precision steel ball(More)
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