Measurement of spin correlation coefficients in p(vector sign)p(vector sign){yields}d{pi}{sup +}
- Department of Physics and Cyclotron Facility, Indiana University, Bloomington, Indiana 47405 (United States)
- University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)
The spin correlation coefficent combinations A{sub xx}+A{sub yy} and A{sub xx}-A{sub yy}, the spin correlation coefficients A{sub xz} and A{sub zz}, and the analyzing power were measured for p(vector sign)p(vector sign){yields}d{pi}{sup +} between center-of-mass angles 25 degree sign {<=}{theta}{<=}65 degree sign 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. Nonvertical beam polarization needed for the measurement of A{sub 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. (c) 2000 The American Physical Society.
- OSTI ID:
- 20216928
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 61, Issue 6; Other Information: PBD: Jun 2000; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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