[en] The analyzing power A/sub N0/ of the pp→π⁺d reaction was measured to a statistical precision of better than +- 0.01 at incident proton beam energies of 375, 450, and 500 MeV, for center-of-mass angles from 20⁰ to 150⁰. The polarization-dependent differential cross sections were fit by associated Legendre functions (using published data for the shapes of the unpolarized differential cross sections). The energy dependence of the resulting b/sub k//sup N0/ coefficients were compared with existing data and theoretical expectations

[en] The angular distributions of the differential cross sections and analyzing powers are presented for the ¹²C(p,π⁺)¹³C( reaction leading to the ground state of ¹³C as well as some of the ¹³C( low-lying excited states. The analyzing powers for some of the transitions exhibit a considerable energy dependence while for other transitions they remain relatively unchanged, thus indicating a dynamic sensitivity of the analyzing power dependent on nuclear structure. Comparisons of theoretical predictions for A/sub N/0 and dsigma/dΩ, based on microscopic two-nucleon models, with our results indicate that substantial differences between theory and experiment still exist for A(p,π⁺)A+1 type of reactions

[en] The angular distributions of both the differential cross section and the analyzing power are presented for the sup10B(p,πsup+) sup11B reaction leading to the ground and first excited states of sup11B. The differential cross section shows very little angular structure or energy dependence, but the analyzing power exhibits a considerable energy dependence for both states. This dependence, similar to that observed for the sup12C(p,πsup+) sup13C reaction, may be a signature of the fact that single-particle final states are involved

[en] Analyzing power measurements of the p vector->tπ⁺ reaction are reported at incident proton energies of 277 and 500 MeV. The 277 MeV results span the angular range from 70⁰ to 130⁰ in the centre of mass while the two 500 MeV measurements at large angles were taken as a check of published results. With the angular distribution of the analyzing power at 277 MeV now known, it is possible to show that the energy dependence of the analyzing power exhibits characteristics closely resembling the shape and magnitude of the analyzing power distribution observed for 1p shell nuclei of similar excitation energies. (orig.)

[en] The angular distributions of both the differential cross-section and the analyzing power are presented for the ¹⁰B(p,π)¹¹B reaction leading to the ground and first excited states of ¹¹B. The differential cross-section shows very little angular structure or energy dependence, but the analyzing power exhibits a considerable energy dependence for both states. This dependence, similar to that observed for the ¹²C(p,π⁺)¹³C reaction, may be a signature of the fact that single-particle final states are involved

No abstract available

No abstract available

[en] Angular distributions of the differential cross sections for the pionic fission ⁶Li(π⁺,³He)³He have been measured at pion energies of 60 and 80 MeV. The differential cross section is found to decrease monotonically with cos²thetasup(*) and is compared with a theoretical prediction. (orig.)

[en] Angular distributions of the ⁶Li(π⁺,³He)³He differential cross section are presented for incident pion beam energies of 60, 80 and 100 MeV, together with a few values at 140 MeV. The results are compared with previously published data and two theoretical predictions. The 60, 80 and 100 MeV data, and previously published results for 15.4 MeV, were fit to Legendre polynomials. The fitted coefficients, which allow the energy dependence of the total and differential cross sections at a fixed c.m. angle to be determined, are also presented. These coefficients show the increasing importance of higher-order partial-waves with increasing pion energy. (orig.)

[en] The prototype test results of a high resolution charged particle tracking detector are reported. The detector is designed to measure vertex topologies of particles produced in the e⁺e^- collisions of the OPAL experiment at LEP. The OPAL vertex detector is a 1 m long, 0.46 m diameter cylindrical drift chamber consisting of an axial and stereo layer each of which is divided into 36 jet cells. A prototype chamber containing four axial and two stereo cells was studied using a pion test beam at CERN. The studies examined the prototype under a variety of operating conditions. An r-Φ resolution of 60 μm was obtained when the chamber was operated with argon (50%)-ethane (50%) at 3.75 bar, and when CO₂ (80%)-isobutane (20%) at 2.5 bar was used a 25 μm resolution was achieved. A z measurement using end-to-end time difference has a resolution of 3.5 cm. The details of these prototype studies are discussed in this paper. (orig.)