Measurement of Spin Correlation coefficients in \vec p \vec p --> d pi^+

Details Measurement of Spin Correlation coefficients in \vec p \vec p --> d pi^+ Measurement of Spin Correlation coefficients in \vec p \vec p --> d pi^+

1999-12-16

arxiv.org/abs/nucl-ex/9912008v1

Phys.Rev. C61 (2000) 064604

Physics

Nuclear Physics

Nuclear Experiment

6 pages, 1 figure

Scientific paper

10.1103/PhysRevC.61.064604

The spin correlation coefficent combinations A_{xx}+A_{yy} and A_{xx}-A_{yy}, the spin correlation coefficients A_{xz} and A_{zz}, and the analyzing power were measured for \vec p \vec p --> d pi^+ between center-of-mass angles 25 deg \leq \theta \leq 65 deg at beam energies of 350.5, 375.0 and 400.0 MeV. The experiment was carried out with a polarized internal target and a stored, polarized beam. Non-vertical beam polarization needed for the measurement of A_{zz} was obtained by the use of solenoidal spin rotators. Near threshold, only a few partial waves contribute, and pion s- and p-waves dominate with a possible small admixture of d-waves. Certain combinations of the observables reported here are a direct measure of these d-waves. The d-wave contributions are found to be negligible even at 400.0 MeV.

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