Observation of hard scattering in photoproduction at HERA
Physics Letters B 297:3-4 (1992) 404-416
Abstract:
We report a study of electron proton collisions at very low Q2, corresponding to virtual photoproduction at centre of mass energies in the range 100-295 GeV. The distribution in transverse energy of the observed hadrons is much harder than can be explained by soft processes. Some of the events show back-to-back two-jet production at the rate and with the characteristics expected from hard two-body scattering. A subset of the two-jet events have energy in the electron direction consistent with that expected from the photon remnant in resolved photon processes. © 1992.A measurement of σtot (γp) at S = 210 GeV
Physics Letters B 293:3-4 (1992) 465-477
Abstract:
The total photoproduction cross section is determined from a measurement of electroproduction with the ZEUS detector at HERA. The Q2 values of the virtual photons are in the range 10-7Influence of cavity configuration on the pulse energy of a high-pressure molecular fluorine laser
Applied Physics B Photophysics and Laser Chemistry 55:1 (1992) 54-59
Abstract:
We report an investigation of a high-pressure molecular fluorine laser operating at 158 nm. Several cavity configurations were studied, including one employing a roof prism as the high reflector. A maximum VUV pulse energy of 237 mJ, corresponding to a specific output of 3.3 J/1 was obtained when the laser was operated as a double-ended device. With single-ended operation the largest output energy was 176 mJ at a specific output of 2.5 J/1. © 1992 Springer-Verlag.Determination of the gain coefficient of an no iaser at 218 nm
Journal of Physics D: Applied Physics 25:4 (1992) 593-596