Absolute π±d differential cross sections and charge asymmetries have been measured at incident pion energies of 30 and 50 MeV, using an active target of scintillator plastic to detect recoil deuterons in coincidence with scattered pions. In addition, a small set of data at 65 MeV was collected for comparision with the results of an earlier experiment performed by this group. Measurements at 50 MeV from the earlier experiment are compared with the results of the present experiment.
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Absolute π±d differential cross sections and charge asymmetries have been measured at an incident pion energy of 65 MeV, using an active target of deuterated scintillator plastic to detect recoil deuterons in coincidence with scattered pions. Statistical and systematic uncertainties in the cross sections are each typically ±3%. The charge asymmetry is consistent with theoretical predictions.
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The differential cross section for scattering of pions on deuterons was measured at LAMPF at laboratory momenta of 343, 441, 539, and 637 MeVc, using an E−ΔE method to identify the recoil deuterons. Angles ranged from 40° to 160° in the center of mass system. The momentum resolution was σ=±3.5% and the angular resolution was ± 1.70° in the laboratory system. The experimental method is discussed, and results are presented and compared with other experimental data as well as with various theoretical calculations. [NUCLEAR REACTIONS H2(π,π); E=230,323,417,512 MeV. D2O, CD2 targets. Measured σ(θ), θ=40∘−160∘, Δθ=1.7∘, Δpp=3.5%.]
X ERROR D(THETA) = 1.7000 DEG.
X ERROR D(THETA) = 1.7000 DEG.
X ERROR D(THETA) = 1.7000 DEG.
Measurements of the differential cross sections for π−d elastic scattering in the backward angular region are presented. These measurements were made at thirteen incident-pion momenta ranging from 496 to 1050 MeV/c, over the center-of-mass angular range 148° to 177°. The experiment was performed at the LBL Bevatron. Experimental apparatus consisted of a liquid deuterium target and a double-arm spectrometer which included scintillation-counter hodoscopes. Center-of-mass differential cross sections were found to be generally smooth over the angular range covered and can be fitted with low-order polynomials. The extrapolated differential cross sections at 180° scattering angle were found to decrease rapidly with increasing momentum, with a prominent peak near 700 MeV/c and a shoulder near 900 MeV/c. These data are discussed in terms of existing models employing "d*" structures, and are compared with other similar measurements.
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FROM LEGENDRE POLYNOMIAL FIT TO D(SIG)/DOMEGA, USING VALUE AT THETA = 0 DEG OBTAINED BY ADDITION OF THE PI+ P AND PI- P FORWARD SCATTERING AMPLITUDES GIVEN BY DISPERSION RELATIONS.
The backward differential cross section for π−−d elastic scattering has been measured at incident momenta between 420 and 1160 MeV/c. The data show two bumps at around 670 and 1100 MeV/c, two dips near 630 and 980 MeV/c, and a break at 550 MeV/c. The result of a phenonomenological fit is consistent with the existence of three dibaryon resonances in this energy region. A theoretical calculation of Kanai et al. agrees well with the data below 800 MeV/c, but the agreement becomes worse above 800 MeV/c.
STATISTICAL ERRORS ONLY.
SMALLER ANGLE DATA NOT GIVEN IN THE PAPER.
The differential cross-section for π − d elastic scattering has been measured at 9.0, 13.0, and 15.2 GeV/ c for t -values up to 2.3 GeV 2 . The results are analysed by comparison with the Glauber scattering model.
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BEAM ERROR D(P)/P = 0.300 PCT.
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