[en] The international A2 Collaboration makes experiments with real photons at MAMI. First partly preliminary results are presented in this and other contributions to this workshop. (author)

[en] Reports results of search for electron neutrino induced cascades observed by the Amanda detector. Discusses detector signature and observable limits for observable cascades

[en] The RELAP5/MOD3.2 computer program has been used to analyze a series of tests investigating heat-transfer from a partly uncovered VVER-1000 core in the KS test facility at the Russian Research Center ''Kurchatov Institute'' (RRC-KI). The analysis documented represents VVER Standard Problem 4 in Joint Project 6, which is the investigation of Computer Code Validation for Transient Analysis of RBMK and VVER Reactors, between the United States and Russian International Nuclear Safety Centers. The experiment facility and data, RELAP5 nodalization, and results are shown for one of the six tests defined in Standard Problem 4. Only part of the data was analyzed due to our conclusion that the available experimental data is not sufficient to allow the modeling of the actual experiment sequence. The experiment initial conditions were reached through a series of transient processes, about which no quantitative information was available. This has required the modeling of an arbitrary computational transient, with the goal of reaching initial conditions similar to those observed during the experiment. The use of an arbitrary transient introduces many degrees of freedom in the analysis, i.e. initial computational values that influence the entire sequence of events, including the loop behavior during the experiment time window. Reasonable agreement between RELAP5 and the experiment data can be obtained by manipulating a number of initial computational values, including the liquid level in the fuel assembly model, the liquid level in the annular region, the quality of the saturated vapor in the voided loop regions, etc. Our study has focused on exploring the sensitivity of results to changes in these initial values which are not based on experimental information, but are selected with the goal of matching the experimentally observed behavior during the experiment time window. We have shown that changes in several initial arbitrary values can lead to similar changes in the calculated loop behavior. Other parameters exist which can directly influence the calculated results, which have been only minimally explored, or have not been explored at all due to lack of time. Because we are not modeling the entire sequence of events which led to the initial experiment conditions, it is not possible to assume that by matching a limited set of measured parameters at the beginning of the experiment time window we have reproduced all the initial actual conditions. We conclude that the analysis of these experiments, while providing a useful demonstration of the RELAP5 capabilities to describe the experimental sequence of events, cannot be used to draw quantitative conclusions about the adequacy of specific RELAP5 models

[en] Report of search for likely point sources for neutrinos observed by the Amanda detector. Places intensity limits on observable point sources. This paper describes the search for astronomical sources of high-energy neutrinos using the AMANDA-B10 detector, an array of 302 photomultiplier tubes, used for the detection of Cherenkov light from upward traveling neutrino-induced muons, buried deep in ice at the South Pole. The absolute pointing accuracy and angular resolution were studied by using coincident events between the AMANDA detector and two independent telescopes on the surface, the GASP air Cherenkov telescope and the SPASE extensive air shower array. Using data collected from April to October of 1997 (130.1 days of livetime), a general survey of the northern hemisphere revealed no statistically significant excess of events from any direction. The sensitivity for a flux of muon neutrinos is based on the effective detection area for through-going muons. Averaged over the Northern sky, the effective detection area exceeds 10,000 m² for E_μ ∼ 10 TeV. Neutrinos generated in the atmosphere by cosmic ray interactions were used to verify the predicted performance of the detector. For a source with a differential energy spectrum proportional to E_ν^-2 and declination larger than +40^o, we obtain E² (dN_ν/dE) (le) 10^-6 GeV cm^-2 s^-1 for an energy threshold of 10 GeV

[en] The 100% duty factor electron accelerator MAMI (Mainzer Mikrotron) has gone into operation. First experiments with quasi-monochromatic real photons have been performed. First results, mostly preliminary, are presented. (orig.)

[en] Half a century of experimental nuclear physics is reviewed by looking at the evolution of some experiments, mostly starting with abstracts from APS meetings in 1950. The main topics reviewed are photonuclear reactions, photon absorption and scattering, photoproduction reactions and elastic electron scattering. (K.A.)

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[en] Short communications only

[en] The accelerator MAMI (Mainzer Mikrotron) with its excellent beam properties and its duty factor of 100% allows to apply coincidence techniques in intermediate energy nuclear physics, which has led to a variety of results with high precision. The real photon collaboration (A2) uses energy tagged bremsstrahlung photons with energies Up to 800 MeV. We have results on total photon absorption (proton, deuteron, ³He and U) on Compton scattering (proton, ⁴He and ¹²C) and on meson production, especially on π⁰ - and η-photoproduction. Double pion production on the proton and the deuteron was measured. The two and three body breakup of ³He was investigated as well as the reactions (γ, NN) and (γ, π^±N) on complex nuclei, etc. Some results are shown and discussed. (author)