[en] Full text: The concept of spontaneous breaking of the Chiral Symmetry of QCD allows predictions for simple meson-meson and meson-nucleon interactions. The CHAOS detector at TRIUMF, Vancouver was designed to make measurements of π-π and π-N interactions to test these predictions. This talk will summarize CHAOS tests of chiral symmetry predictions and other measurement of pion induced reactions. The ground state of the QCD Vacuum results from Spontaneously Broken chiral symmetry. Noethers theorem says that such spontaneously broken symmetry requires the existence of massless Goldstone Bosons. In QCD these are identified as the pions and kaons of the 0^- meson octet. With this it is possible to make specific predictions for π-π and π-N interactions at low energy. The CHAOS detector was constructed at TRIUMF in order to make measurements to test these predictions for these and other pion induced reactions. In particular we have made measurements of the X scattering lengths from the πp → ππN reaction, measurements of analyzing powers for πN elastic scattering at low energy, measurements of πAππX reactions, high sensitivity searches for d' dibaryon and most recently measurements of πN elastic scattering in the Coulomb-Nuclear interference region. This talk will summarise the high points of the CHAOS Physics program

[en] Full text: The concept of spontaneous breaking of the Chiral Symmetry of QCD allows predictions for simple meson-meson and meson-nucleon interactions. The CHAOS detector at TRIUMF, Vancouver was designed to make measurements of ππ and π-N to test these predictions. This talk will summarize CHAOS tests of chiral symmetry predictions and other measurement of pion induced reactions. The ground state of the QCD Vacuum results from Spontaneously Broken chiral symmetry. Noethers theorem says that such spontaneously broken symmetry requires the existence of massless Goldstone Bosons. In QCD these are identified as the pions and kaons of the 0^- meson octet. With this it is possible to make specific predictions for ππ and π-N interactions at low energy. The CHAOS detector was constructed at TRIUMF in order to make measurements to test these predictions for these and other pion induced reactions. In particular we have made measurements of the π-π scattering lengths from the πp→ππN reaction, measurements of analyzing powers for πN elastic scattering at low energy, measurements of πA→ππX reactions, high sensitivity searches for d' dibaryon and most recently measurements of πN elastic scattering in the Coulomb-Nuclear interference region. This talk will summarise the high points of the CHAOS Physics program

[en] The paper discusses the performances of a versatile computerized system developed at the Microanalytical Research Centre of the Melbourne University, for handling multiparameter data that may arise from a variety of experiments - nuclear, accelerator mass spectrometry, microprobe elemental analysis or 3-D microtomography. Some of the most demanding requirements arise in the application of microprobes to quantitative elemental mapping and to microtomography. A system to handle data from such experiments had been under continuous development. It has been reprogramed to run on a DG DS7540 workstation. The whole system of software has been rewritten, greatly expanded and made much more powerful and faster, by use of modern computer technology - a VME bus computer with a real-time operating system and a RISC workstation running UNIX and the X-window environment

[en] Proton induced x-ray emission analyse tomography (PIXET) was used to provide 3-D images of elemental composition of a collection of flyash particles (NBS 1366 standard flyash) held in cyanoacrylate matrix. It is emphasized that in order to apply PIXET to trace elements it is necessary to drastically increase the data collection rate so that the required statistics per pixel can be achieved in a reasonable time. The most direct way to achieve this is to increase the X-ray detection efficiency. 6 refs., 2 figs

[en] Short communication

[en] Recent moves in Ion Beam Microanalysis towards the use of a rapidly growing number of very high resolution, low current and single ion techniques has led to the need for high demagnification and greatly improved beam quality. There is also a move to apply Microbeams at higher energies and with heavier ions. This also puts demands on the focusing system and beam control. This paper describes the recent development of 2-stage lens systems to be applied here and overseas, both at very high resolution and at high energies with heavy ions. It looks at new ion beam analysis applications of such ion microprobes. 8 refs., 1 tab., 1 fig

[en] Full text: The Australian Experimental High Energy Physics Group is heavily involved in the construction, operation and data analysis of the BELLE experiment now collecting data at KEK in Japan. The Standard Model of Particle Physics predicts that there will be sizable CP violating effects in some rare decays of B mesons. The primary aim of the BELLE experiment is to search for this CP violation in the B meson system. If we find such processes it will be only the second time such effects have been found in nature. In addition the richness of the predicted effects in the B meson system enable stringent tests of the Standard Model in this to-now un-explored region. To do this the BELLE experiment exploits the high luminosity KEKB accelerator in Japan. This collides 8.0GeV e^- with 3.5GeV e⁺ particles at luminosities above 2.0xl0³³cm²sec^-1. The interaction point of the accelerator is surrounded by the sophisticated BELLE detector which employs state of the hardware to perform vetexing, tracking, momentum and energy measurements along with particle identification for all long lived charged and neutral particles (except neutrinos). This presentation will introduce the main features of the BELLE experiment along with initial results for CP violation, B mixing and rare B decays

[en] The pion production reaction π⁺→π⁺π^± on ⁴⁵Sc was studied at incident pion energies of T_π⁺=240, 260, 280, 300, and 320 MeV. The experiment was performed using the M11 pion-channel at TRIUMF, and multiparticle events, (π⁺,π⁺π^±) and (π⁺,π⁺π^±p), were detected with the CHAOS spectrometer. Results are reported in the form of both differential and total cross sections, and are compared to theoretical predictions and the reaction phase space. The present investigation of the T-dependence of the π⁺A→π⁺π^±A' reaction complements earlier examinations of the A-dependence of the reaction, which was measured using ²H, ⁴He, ¹²C, ¹⁶O, ⁴⁰Ca, and ²⁰⁸Pb targets at ∼280 MeV. Some general properties of the pion-induced pion production reaction in nuclear matter will be presented, based on the combined results of the two studies

[en] We report a measurement of the inclusive electron energy spectrum for charmed semileptonic decays of B mesons in a 140 fb^-1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e⁺e^- collider. We determine the first four moments of the electron energy spectrum for threshold values of the electron energy between 0.4 and 2.0 GeV. In addition, we provide values of the partial branching fraction (zeroth moment) for the same electron threshold energies, and independent measurements of the B⁺ and B⁰ partial branching fractions at 0.4 GeV and 0.6 GeV electron threshold energies. We measure the independent B⁺ and B⁰ partial branching fractions with electron threshold energies of 0.4 GeV to be ΔB(B⁺→X_ceν)=(10.79±0.25(stat.)±0.27(sys.))% and ΔB(B⁰→X_ceν)=(10.08±0.30(stat.)±0.22(sys.))%. Full correlations between all measurements are evaluated

[en] Differential cross sections for pi- p and pi+ p elastic scattering were measured at five energies between 19.9 and 43.3 MeV. The use of the CHAOS magnetic spectrometer at TRIUMF, supplemented by a range telescope for muon background suppression, provided simultaneous coverage of a large part of the full angular range, thus allowing very precise relative cross section measurements. The absolute normalization was determined with a typical accuracy of 5 %. This was verified in a simultaneous measurement of muon proton elastic scattering. The measured cross sections show some deviations from phase shift analysis predictions, in particular at large angles and low energies. From the new data we determine the real part of the isospin forward scattering amplitude