Spin Correlation Coefficients in pp-->dpi+ from 350 to 400 MeV

Please contact the CEEM at (812) 855-5466 or bl-ceem-offuse@exchange.indiana.edu to obtain information contained in the documents below in an accessible format.

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. B. v. Przewoski et al., Phys. Rev. C61, 064604 (2000)



 Results:

                                                              

 350 MeV

 -------

 theta   (-A^b_y        Axx-Ayy    Axx+Ayy       Axz         Azz    Azz-Axx-Ayy

  cm      *A^t_y)^1/2

 37.5        .082        .379      -1.401       -.367       -.640        .761

             .119        .397        .272        .311        .253        .363

 42.5       -.112        .213      -1.372        .058       -.252       1.119

             .072        .234        .168        .173        .141        .215

 47.5       -.093        .112      -1.328       -.222       -.630        .698

             .054        .176        .125        .123        .100        .157

 52.5       -.176       -.033      -1.339        .030       -.508        .830

             .047        .158        .110        .112        .091        .140

 57.5       -.261       -.127      -1.582       -.079       -.479       1.103

             .055        .180        .129        .127        .104        .162

 62.5       -.279        .084      -1.421       -.252       -.575        .846

             .118        .383        .268        .269        .219        .331



 375 MeV

 -------

 theta   (-A^b_y        Axx-Ayy    Axx+Ayy       Axz         Azz    Azz-Axx-Ayy

  cm      *A^t_y)^1/2

 27.5       -.045        .046      -1.797       -.309       -.950        .846

             .086        .251        .165        .230        .243        .289

 32.5        .034        .165      -1.771       -.242       -.770       1.001

             .032        .095        .061        .084        .089        .107

 37.5       -.016        .040      -1.715       -.209       -.659       1.056

             .019        .059        .039        .048        .051        .064

 42.5       -.035       -.024      -1.656       -.298       -.658        .998

             .016        .048        .032        .037        .039        .050

 47.5       -.048        .103      -1.628       -.272       -.676        .952

             .015        .044        .029        .034        .036        .046

 52.5       -.104        .007      -1.666       -.178       -.643       1.023

             .015        .043        .029        .033        .035        .045

 57.5       -.139        .053      -1.634       -.148       -.603       1.031

             .018        .053        .035        .041        .043        .055

 62.5       -.198       -.027      -1.612       -.246       -.587       1.025

             .037        .107        .072        .086        .091        .114



 400 MeV

 -------

 theta   (-A^b_y        Axx-Ayy    Axx+Ayy       Axz         Azz    Azz-Axx-Ayy

  cm      *A^t_y)^1/2

 27.5       -.065        .192      -1.866       -.173       -.586       1.281

             .107        .329        .207        .268        .362        .413

 32.5        .025       -.128      -1.799       -.277       -.947        .852

             .057        .167        .115        .129        .174        .207

 37.5       -.021        .152      -1.680       -.221       -.697        .983

             .042        .127        .085        .099        .133        .156

 42.5       -.035        .160      -1.778       -.187       -.806        .972

             .034        .104        .069        .079        .107        .126

 47.5        .033        .055      -1.695       -.268       -.864        .831

             .025        .074        .049        .057        .077        .091

 52.5        .022        .052      -1.677       -.264       -.798        .879

             .023        .070        .047        .052        .071        .085

 57.5       -.063        .036      -1.741       -.335       -.869        .873

             .031        .092        .061        .069        .093        .110

 62.5       -.149       -.119      -1.607       -.225       -.357       1.251

             .065        .193        .130        .146        .197        .232





Last modified: December 21 1999
by B. v. Przewoski