Showing 6 of 6 results
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 normalisation 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.
Elastic PI- P cross section for incident kinetic energy 43.3 MeV for the rotated target data. Errors shown are statistical only.
Elastic PI- P cross section for incident kinetic energy 43.3 MeV. Errors shown are statistical only.
Elastic PI- P cross section for incident kinetic energy 37.1 MeV. Errors shown are statistical only.
Elastic PI- P cross section for incident kinetic energy 32.0 MeV. Errors shown are statistical only.
Elastic PI- P cross section for incident kinetic energy 25.8 MeV. Errors shown are statistical only.
Elastic PI- P cross section for incident kinetic energy 19.9 MeV. Errors shown are statistical only.
Elastic PI+ P cross section for incident kinetic energy 43.3 MeV for the rotated target data. Errors shown are statistical only.
Elastic PI+ P cross section for incident kinetic energy 43.3 MeV. Errors shown are statistical only.
Elastic PI+ P cross section for incident kinetic energy 37.1 MeV. Errors shown are statistical only.
Elastic PI+ P cross section for incident kinetic energy 32.0 MeV. Errors shown are statistical only.
Elastic PI+ P cross section for incident kinetic energy 25.8 MeV. Errors shown are statistical only.
Elastic PI+ P cross section for incident kinetic energy 19.9 MeV. Errors shown are statistical only.
Analyzing powers of pion-proton elastic scattering have been measured at PSI with the Low Energy Pion Spectrometer LEPS as well as a novel polarized scintillator target. Angular distributions between 40 and 120 deg (c.m.) were taken at 45.2, 51.2, 57.2, 68.5, 77.2, and 87.2 MeV incoming pion kinetic energy for pi+ p scattering, and at 67.3 and 87.2 MeV for pi- p scattering. These new measurements constitute a substantial extension of the polarization data base at low energies. Predictions from phase shift analyses are compared with the experimental results, and deviations are observed at low energies.
Analyzing power for PI+ P elastic scattering at incidient kinetic energy 87.2 MeV from the data set 1.
Analyzing power for PI+ P elastic scattering at incidient kinetic energy 68.4 MeV from the data set 1.
Analyzing power for PI+ P elastic scattering at incidient kinetic energy 57.2 MeV from the data set 1.
Analyzing power for PI+ P elastic scattering at incidient kinetic energy 51.2 MeV from the data set 2.
Analyzing power for PI+ P elastic scattering at incidient kinetic energy 45.2 MeV from the data set 2.
Analyzing power for PI+ P elastic scattering at incidient kinetic energy 87.2 MeV from the data set 3.
Analyzing power for PI+ P elastic scattering at incidient kinetic energy 77.2 MeV from the data set 3.
Analyzing power for PI+ P elastic scattering at incidient kinetic energy 68.6 MeV from the data set 3.
Analyzing power for PI+ P elastic scattering at incidient kinetic energy 57.3 MeV from the data set 3.
Analyzing power for PI- P elastic scattering at incidient kinetic energy 87.2 MeV from the data set 3.
Analyzing power for PI- P elastic scattering at incidient kinetic energy 67.3 MeV from the data set 3.
Analyzing powers for πp elastic scattering at bombarding energies below the Δ(1232) resonance were measured at TRIUMF using the CHAOS spectrometer and a polarized spin target. This work presents π− data at six incident energies of 57, 67, 87, 98, 117, and 139 MeV, and a single π+ data set at 139 MeV. The higher energy measurements cover an angular range of 72°<~θc.m.<~180° while the lower energies were limited to 101°<~θc.m.<~180°. There is a high degree of consistency between this work and the predictions of the VPI/GWU group’s SM95 partial wave analysis.
Analysing power measurements for a 139 GeV PI+ beam (standard track).
Analysing power measurements for a 139 GeV PI- beam (standard track).
Analysing power measurements for a 117 GeV PI- beam (standard track).
Analysing power measurements for a 98 GeV PI- beam (standard track).
Analysing power measurements for a 87 GeV PI- beam (standard track).
Analysing power measurements for a 87 GeV PI- beam (short track).
Analysing power measurements for a 67 GeV PI- beam (standard track).
Analysing power measurements for a 67 GeV PI- beam (short track).
Analysing power measurements for a 57 GeV PI- beam (short track).
Analyzing powers for πp elastic scattering were measured using the CHAOS spectrometer at energies spanning the Δ(1232) resonance. This work presents π+ data at the pion kinetic energies 117, 130, 139, 155, 169, 180, 193, 218, 241, and 267 MeV and π− data at 87, 117, 193, and 241 MeV, covering an angular range of 50°<~θc.m.<~180° at the higher energies and 90°<~θc.m.<~180° at the lower energies. Unique features of the spectrometer acceptance were employed to reduce systematic errors. Single-energy phase shift analyses indicate the resulting S11 and S31 phases favor the results of the SM95 phase shift analysis over that of the older KH80 analysis.
Measurement of the PI+ analysing power at 117 MeV.. The data were collected in the conventional mode and may be independently floated within the systematic error.
Measurement of the PI+ analysing power at 139 MeV.. The data were collected in the conventional mode and may be independently floated within the systematic error.
Measurement of the PI- analysing power at 87 MeV.. The data were collected in the conventional mode and may be independently floated within the systematic error.
Measurement of the PI- analysing power at 117 MeV.. The data were collected in the conventional mode and may be independently floated within the systematic error.
Measurement of the PI+ analysing power at 117 MeV.. This is the first group of data taken at the same target polarization. The data should not be floated independently from others from table 2.
Measurement of the PI+ analysing power at 130 MeV.. This is the first group of data taken at the same target polarization. The data should not be floated independently from others from table 2.
Measurement of the PI+ analysing power at 139 MeV.. This is the first group of data taken at the same target polarization. The data should not be floated independently from others from table 2.
Measurement of the PI+ analysing power at 155 MeV.. This is the first group of data taken at the same target polarization. The data should not be floated independently from others from table 2.
Measurement of the PI+ analysing power at 169 MeV.. This is the first group of data taken at the same target polarization. The data should not be floated independently from others from table 2.
Measurement of the PI+ analysing power at 139 MeV.. This is the second group of data taken at the same target polarization. The data should not be floated independently from others in table 3.
Measurement of the PI+ analysing power at 169 MeV.. This is the second group of data taken at the same target polarization. The data should not be floated independently from others in table 3.
Measurement of the PI+ analysing power at 180 MeV.. This is the second group of data taken at the same target polarization. The data should not be floated independently from others in table 3.
Measurement of the PI+ analysing power at 193 MeV.. This is the second group of data taken at the same target polarization. The data should not be floated independently from others in table 3.
Measurement of the PI+ analysing power at 218 MeV.. This is the second group of data taken at the same target polarization. The data should not be floated independently from others in table 3.
Measurement of the PI+ analysing power at 241 MeV.. This is the second group of data taken at the same target polarization. The data should not be floated independently from others in table 3.
Measurement of the PI+ analysing power at 267 MeV.. This is the second group of data taken at the same target polarization. The data should not be floated independently from others in table 3.
Measurement of the PI- analysing power at 193 MeV.. This is the third group of data taken at the same target polarization. The data should not be floated independently from others in table 4.
Measurement of the PI- analysing power at 241 MeV.. This is the third group of data taken at the same target polarization. The data should not be floated independently from others in table 4.
We present results from a high momentum resolution measurement of the π − p elastic differential cross section near the η production threshold. By analysing the cusp discontinuity in the elastic cross section we deduce the non-spin-flip elastic amplitude and compare it with solutions from phase-shift analyses.
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Measurements are reported of the differential cross section for the reaction π − +p→ ω +n from threshold to a final-state c.m. momentum P ∗ of 200 MeV /c . The previously reported fall in total cross section σ/P ∗ below about 100 MeV/ c is again seen. The differential cross section remains close to isotropic over the entire range. A paralle experiment on the variation in the elastic differential cross section across the threshold shows evidence of this threshold. The elastic data cover a range of incident moments from 1010 to 1180 MeV/ c in steps of 5 MeV/ c .
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