CWRU multiwire proportional counter readout system

Bevington, P. R.; Leskovec, R. A.

doi:10.1016/0029-554x(77)90278-6

Cited by 7 publications

(1 citation statement)

References 3 publications

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“…Elastic pp scattering was distinguished from background by detecting in coincidence both finalstate protons in multiwire proportional chambers (MWPC) 8 and requiring the precise angular correlation for two-body kinematics. The background was typically 0.5%, consisting mostly of quasielastic C(p,2p) with a small contribution from random coincidences.…”

Section: Etersmentioning

confidence: 99%

Polarization Analyzing PowerAy(θ)inppElastic Scattering at 643, 787, and 796 MeV

et al. 1978

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A full description of the detector characteristics and circuitry will be given in a separate publication. 12 J 0 Bo Hastings, J. Appl. Phys. 48 P 1576Phys. 48 P (1977. 13 J 0 A. Bearden, Phys. Rev" B237, 455 (1965).Data have been obtained for the polarization tering from near 30° to 90° (cm.) at 643, 787, typically ±0.003 with an overall normalization tent with existing phase-shift analyses.Below 400 MeV the proton-proton interaction proceeds essentially through the elastic channel with recent phase-shift analyses 1 indicating that the data are reasonably consistent. In the intermediate energy range from 400 MeV to 1 GeV considerable uncertainty still exists in our knowledge of the phase shifts. 2 ' 3 With the advent of a polarized ion source at the Clinton P. Anderson Meson Physics Facility (LAMPF), a program of experiments is underway to determine uniquely the proton-proton phase shifts at energies in the 400-to 800-MeV range to complement the recent impressive results appearing from TRIUMF. 4 This paper describes measurements of the polarization analyzing power A y (6) in pp elastic scattering that are almost an order of magnitude more precise than earlier data above 500 MeV. Figure 1 compares our polarization analyzing power measurements at 796 MeV with a calculation made by extrapolating from 750 to 800 MeV the energy-dependent phase-shift solution of MacGregor, Arndt, and Wright, paper XIII 2 (shown as a dashed line) and a calculation with the imaginary part of the 6(\D 2 ) increased by 30° (shown as a solid line). Although the fit is improved by analyzing power A y (0) in pp elastic scatand 796 MeV. Relative uncertainties are uncertainty of (?l u5 )%. Data are not consisthis change, in agreement with what we found in fitting our elastic scattering differential cross sections at this energy reported earlier, 5 this should only be taken as an indication of the large uncertainties in our knowledge of the phase shifts at this energy. Measurements at 643 MeV show a similar shape but the polarization analyzing power at the maximum is increased to 0.55. Figure 2 shows a plot of the polarization analyzing power near its maximum value [about 40° (c c m.)] as a function of proton energy in the intermediate range. Our three data points at 643, 787, and 796 MeV are generally consistent with, but much more precise than, previous data near these energies* The technique for measuring polarization analyzing power is well known. 7 In this experiment a beam of protons with transverse polarization up to 0.92 was obtained from the LAMPF accelerator and focused (typically 4 mm diam) onto a CH 2 target. Data were taken at three beam energies, two of which were measured by the High Resolution Spectrometer (HRS) to be 796± 2 and 787 ±2 MeV; the third energy was estimated to be 643± 4 MeV from accelerator operating param-384

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Section: Etersmentioning

confidence: 99%

Polarization Analyzing PowerAy(θ)inppElastic Scattering at 643, 787, and 796 MeV

et al. 1978

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Proton total reaction cross section measurements forCa40,44,48at 700 MeV

et al. 1979

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Proton total reaction cross sections for 700 MeV protons on ' ""Ca have been measured by detecting inelastically scattered particles at angles greater than 10' {lab). The measurements were performed with overall uncertainties of +6.2% and relative uncertainties of +2,5%%u&. These measurements yield the values of o z(' Ca) = 614 mb, cr"( Ca) = 643 mb, and cd( 'Ca) = 736 mb. .Matter radii differences A(44 -40) = (0.05+0.09)fm and 6(48 -40) = (0.36+0.09)fm were extracted based on a theoretical calculation which takes advantage of the geometrical nature of the cross section. The results are compared to other available measurements of total reaction cross sections on medium-weight nuclei at medium energies and to other determinations of the matter radii differences for the calcium isotopes. NUCLEAR STRUCTURE~4~4 Ca; measured proton total reaction cross sections, E=700 MeV. Deduced matter radii differences.

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