Elsevier

Nuclear Physics A

Volume 404, Issue 1, 1 August 1983, Pages 29-50
Nuclear Physics A

Comparison of polarization and analyzing power for the 9Be(p, n)9B reaction

https://doi.org/10.1016/0375-9474(83)90412-8Get rights and content

Abstract

A recent Lane model of the 9Be + nucleon system raised the question of differences between the polarization P(θ) and the analyzing power A(θ) in (p, n) reactions between mirror nuclei. Since these two observables are identical under exact charge symmetry, observation of a difference would indicate the breaking of this symmetry, probably by the Coulomb interaction. This paper describes the techniques for measurements of P(θ) and A(θ) in (p, n) reactions, with an emphasis on the elimination of systematic errors and the determination of background contributions. Measurements of both observables were made for the 9Be(p, n0)9B reaction at several angles for energies from 3 to 10 MeV. The results are combined with previous measurements to develop data sets for a comprehensive comparison of P(θ) and A(θ). Previous A(θ) values agree well with the present measurements, while most of the earlier P(θ) data are shown to be in error. Our data show that there do exist sizeable differences between P(θ) and A(θ) at energies from Ep = 5–7 MeV. The existence of such differences in light nuclear systems is consistent with recent shell-model calculations for the 11B(p, n0)11C reaction.

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    • Cited by (0)

    †††

    Supported in part by the US Department of Energy.

    †

    Now at Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

    ††

    On leave from the Physikalisches Institut, Universität Tübingen, Tübingen, West Germany; supported in part by the Deutsche Forschungsgemcinschaft.

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