[en] Our present understanding of the ΔS=0 hadronic weak interaction is based on a series of high precision experiments in the two-nucleon system and light nuclei which isolate the weak interaction via its parity violating signature. At low energy, the link between parity nonconserving (PNC) observables and the standard electroweak theory is via a set of weak meson-nucleon coupling constants which are predicted using a quark model of the physical hadrons. One striking feature that emerges is that the isovector pion coupling, which is almost entirely carried by neutral currents at the quark level, is strongly suppressed relative to theoretical predictions. At higher energy, a surprisingly large PNC asymmetry in p-p scattering has been found at 6 GeV/c. Direct QCD-based calculations which explain the data have been the subject of recent theoretical debate. New measurements at energies of 5 GeV and higher are needed to confirm the effect and guide theoretical efforts. With the availability of polarized proton beams at higher energy, as recently achieved at Brookhaven and planned for the KAON facility in Canada, the prospect for performing such experiments is very good. (orig.)

[en] This paper reviews the present status of parity violation measurements in p-p scattering. Low and intermediate energy results are interpreted in terms of the weak meson exchange model. The longitudinal analyzing power angular distribution contains important physics at intermediate energy. Preparations for a unique measurement of A_z(Θ) at 230 MeV, in progress at TRIUMF, is discussed

[en] Sources of intrinsic detector noise for ionization chambers operated in dc mode, suitable for parity violation measurements in proton-proton scattering at intermediate and high energy, are discussed. Measurements of the intrinsic noise factor for axial and transverse-field parallel plate ionization chambers used in high-precision proton beam current measurements at TRIUMF are reported. (2 refs., 3 figs.)

[en] A brief summary of the 'Symmetries' sessions are given. Speakers reported on experimental tests of Charge Symmetry, Parity and Time Reversal violation and their theoretical interpretation, spanning a wide range of energy scales and experimental techniques. 17 refs., 2 figs

[en] Our present understanding of the ΔS=0 hadronic weak interaction is based on a collection of high precision experiments in the two-nucleon system and light nuclei, which isolate the weak interaction via its parity-violating signature. The weak nucleon-nucleon interaction at low and intermediate energies is described in terms of a meson exchange model involving π, ρ and ω mesons, with one strong and one weak vertex. Experiments have yielded significant but incomplete information on weak meson-nucleon couplings, which are in qualitative agreement with predictions based on the standard model, although the pion coupling is much weaker than expected. Studies of the p+p system have provided the most significant constraints on weak meson-nucleon couplings to date, through measurements of the helicity dependence of elastic scattering (A_z); new results at low energy, plus the outcome of an intermediate energy experiment in progress at TRIUMF, will have significant impact on our knowledge of the weak nucleon-nucleon interaction. The present status of theory and experiment will be reviewed, with emphasis on experimental techniques and interpretation in the context of the standard model

[en] Sources of intrinsic detector noise for ionization chambers operated in d.c. current mode, suitable for parity violation measurements in p^→-p scattering at intermediate and high energy are discussed. Measurements of the intrinsic noise factor for axial- and transverse-field parallel plate ionization chambers used in high-precision proton beam current measurements at TRIUMF are reported. (author)

[en] In my view, the parallel sessions on ''Symmetries'' were amongst the most stimulating sessions of this conference. Speakers reported on experimental tests of Charge Symmetry, Parity, and Time Reversal violation and their theoretical interpretation, spanning a wide range of energy scales and experimental techniques. I hope that this brief summary will whet the reader's appetite to explore the many contributed papers which follow

[en] This report presents the proceedings of the Symposium/Workshop on Parity Violation in Hadronic systems which was held on May 28 and May 29, 1987 at TRIUMF. The program consisted of nine major presentations plus four short papers. The purpose of the Symposium/Workshop was to discuss the status of parity violation in hadronic systems and come to an assessment of this sub-discipline of nuclear science

[en] The circular polarization of the 1.081 MeV γ rays from /sup 18/F has been measured to be (1.7 +- 5.8) x 10/sup -4/. /sup 18/F was produced by a 4.05 MeV ³He⁺ beam impinging on a recirculating water target with a thin entrance window. The circular polarization was measured with four magnetic transmission polarimeters, each backed by a 150 cm³ n-type Ge detector. A fast data acquisition system limited overall peak losses to 30% at a count rate of 60 kHz per detector. Supplementary experiments were carried out to investigate the sensitivity of the circular polarization measurement to systematic variations of beam position and intensity. These effects were found to be negligible relative to the statistical uncertainty. The experimental result is interpreted in terms of an isovector parity-nonconserving matrix element between the chemical bond0⁺,T = 1,1.042 MeV> and chemical bond0^-,T = 0,1.081 MeV> states in /sup 18/F that is dominated by the weak pion exchange contribution. The present result for the weak pion-nucleon coupling strength is chemical bondf/sub π/¹chemical bond = (0.4/sub -0.4//sup +1.4/) x 10/sup -7/, which is significantly smaller than recent theoretical predictions based on the Weinberg-Salam model

[en] The interactions of matter are governed by four basic forces: the strong force, responsible for the existence of nucleons and nuclei; the electromagnetic force, responsible for the existence of atoms and molecules; the weak force which gives rise to particle and nuclear decays; and the gravitational force responsible for the motion of the stars and the planets. In the presence of the strong interaction, the weak interaction is usually completely masked, being only 10^-7 as strong. However, the weak interaction has a unique property that permits its effects to be identified even against such a large background. The weak interaction does not preserve mirror symmetry, i.e., for the weak force a particular process is not independent of the choice of coordinate system (left-handed or right-handed). This unique signature is referred to as parity violation. What can be learned from measurements of parity violation in proton-proton scattering? (author)