Facility for the measurement of proton polarization in nuclear reactions

doi:10.1016/0029-554X(79)90669-4

Nuclear Instruments and Methods

Volume 159, Issues 2–3, 15 February 1979, Pages 413-419

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Abstract

A polarimetry facility based on high resolution and high efficiency silicon polarimeters with on-line particle identification is described. It has proven its capability to measure polarizations in ( $^{3} He, p$ ) reaction with cross section levels of 40 μb/sr.

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A new polarimetry facility has been set up. The four polarimeters used in different geometries are equipped with silicon or carbon analyzers. Extreme care has been taken to cancel out false asymmetries from apparatus misalignments. To that purpose, an automatic beam centering system has been built, two polarimeters are always run simultaneously on both sides of the beam at symmetric angles and geometric means are performed on data reduction. The installation is described in detail and data analysis and calibration runs are presented and discussed.
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Facility for the measurement of proton polarization in the range 50-70 MeV
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A proton polarimetry facility based on silicon analyzers combined with high-purity germanium detectors is described. The scattering efficiency is 1.5 × 10⁻⁵ at 60 MeV with an effective analyzing power of 0.71 and the energy resolution is about 300 keV fwhm. The facility has succeeded in measuring the depolarization in p⁻¹³C elastic scattering separated clearly from inelastic events. In order to use a silicon detector as an analyzer target, measurements of cross sections and analyzing powers have been performed at proton energies of 65, 60, 55, 50 and 45 MeV.
Asymétrie du temps: Polarisation et pouvoir d'analyse dans les réactions nucléaires
1983, Nuclear Physics, Section A
Measurements of the proton polarization in the reactions ⁷Li(³He, $p$ )⁹Be and ⁹Be(³He, $p$ )¹¹B and of the analyzing powers of the inverse reactions, initiated by polarized protons at the same c.m. energies, show significant differences which imply the failure of the polarization-analyzing-power theorem and, prima facie, of time-reversal invariance in these reactions. The reaction ²H(³He, $p$ )⁴He and its inverse have also been investigated and show some smaller differences. A discussion of the instrumental asymmetries is presented.

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^☆: Work supported in part by the AECB and the NRC of Canada and by the Ministery of Education of Québec.

^†: Present address, Laboratoire de Physique Nucléaire, Université de Montréal, Montréal, Qué, Canada.

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Facility for the measurement of proton polarization in nuclear reactions☆

Abstract

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Nucl. Phys.

Nucl. Phys.