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We report the results of the investigation of 18 500 frames of π+p interactions in the Brookhaven 20-in. bubble chamber at an incident energy of 900 MeV. It is found that single-pion production proceeds almost entirely through formation of the N33* isobar. The production mechanism of the N33* is analyzed in terms of its spin density matrix. Comparison is made with Stodolsky and Sakurai's ρ-exchange model and with the absorptive peripheral model.

1 data table

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Interaction of Positive Pions with Hydrogen at 600 MeV

Newcomb, Peter C.A. ;

Phys.Rev. 132 (1963) 1283-1292, 1963.

Inspire Record 47245 DOI 10.17182/hepdata.26734

The Berkeley 15-in. hydrogen bubble chamber was used to investigate π+−p interactions at 600 MeV. There were 1738 good events, of which 71.9±0.8% were elastic. Partial waves up to at least D52 are required to fit the elastic angular distribution. The inelastic events were almost entirely single-pion production. The ratio (p+0)(n++) was found to be 5.5±0.8 which agrees well with 4.9 predicted by the (32, 32) pion-nucleon isobar model of Olsson and Yodh. It is also consistent with 6.5 predicted by Sternheimer and Lindenbaum. The pion momentum spectra and the π−π Q-value distributions also support the Olsson and Yodh model. Thus the (32, 32) pion-nucleon isobar is apparently the principal mechanism for single-pion production at 600 MeV. Angular distributions for the single-pion-production data are presented.

1 data table

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Inelastic scattering of 390 MeV $\pi^+$ mesons from protons

Grigor'ev, E.L. ; Mitin, N.A. ;

Sov.Phys.JETP 10 (1960) 1123-1124, 1960.

Inspire Record 1498642 DOI 10.17182/hepdata.75443

None

1 data table

Table 1

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Mesure de la polarisation du proton de recul dans la diffusion élastique pi+- p entre 550 et 1025 MeV

Yonnet, Jacques ;

CNRS-A-O-4171, 1970.

Inspire Record 1187688 DOI 10.17182/hepdata.1304

None

6 data tables

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MEASUREMENT OF DIFFERENTIAL CROSS-SECTIONS OF pi+ p AND pi- p ELASTIC SCATTERING IN THE REGION 425-MeV TO 640-MeV

Gordeev, V.A. ; Koptev, V.P. ; Kruglov, S.P. ; et al.

Sov.J.Nucl.Phys. 29 (1979) 339, 1979.

Inspire Record 132291 DOI 10.17182/hepdata.1059

None

12 data tables

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Elastic pi+-p and p-p Scattering at 1.23 Bev/c

Roellig, L.O. ; Glaser, D.A. ;

Phys.Rev. 116 (1959) 1001-1007, 1959.

Inspire Record 944991 DOI 10.17182/hepdata.736

Elastic π+−p scattering at 1.1 Bev and elastic p−p scattering at 582 Mev have been measured using a propane bubble chamber. On the basis of 661 identified π+−p elastic scatterings found in the scanning of 1.726×106 cm of pion track, the total elastic cross section is found to be 12.3±1.2 mb. The differential cross section is rather isotropic at large angles and exhibits a strong peak for small forward scattering angles. If the forward peak is interpreted as diffraction scattering according to the optical model, the data are best fitted by a proton with a π+−p interaction radius, R=(0.99−0.11+0.13)×10−13 cm and an opacity, O=0.70−0.07+0.06. The total cross section for p−p elastic scattering at 582 Mev was found to be 24.2±1.6 mb on the basis of 2442 elastic scatterings observed in the scanning of 3.000×106 cm of proton track. Both differential and total p−p cross sections are in excellent agreement with the results of counter experiments in this energy region.

2 data tables

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Measures of the differential effective sections $\pi ±p$ to 410 MeV and 490 MeV forwards

Banner, M. ; Detoeuf, J.F. ; Fayoux, M.L. ; et al.

Nuovo Cim.A 50 (1967) 431-448, 1967.

Inspire Record 1185325 DOI 10.17182/hepdata.896

Measurements of π±p elastic differential cross-sections have been performed in the forward direction, using a missing-mass spark chamber spectrometer. The films have been seanned by an automatic apparatus. A phase-shift analysis of the experimental data has been done, leading to three solutions. Various experiments are proposed in order to resolve the ambiguities.

4 data tables

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