The transverse spin correlations Axx and Ayy in the np-> d pi^0 reaction have been measured for the first time in quasi-free kinematics at the COSY-ANKE facility using a polarised deuteron beam incident on a polarised hydrogen cell target. The results obtained for neutron energies close to 353 MeV and 600 MeV are in good agreement with the partial wave analysis of data on the isospin-related pp-> d pi^+ reaction, though the present results cover also the small-angle region, which was largely absent from these data.
@article{arxiv.1307.4950,
title = {First measurements of spin correlations in the np -> d pi^0 reaction},
author = {V. Shmakova and D. Mchedlishvili and S. Dymov and T. Azaryan and S. Barsov and D. Chiladze and R. Engels and R. Gebel and B. Gou and K. Grigoryev and M. Hartmann and A. Kacharava and V. Komarov and P. Kulessa and A. Kulikov and V. Kurbatov and N. Lomidze and B. Lorentz and G. Macharashvili and S. Merzliakov and M. Mikirtytchiants and S. Mikirtytchiants and M. Nioradze and H. Ohm and D. Prasuhn and F. Rathmann and V. Serdyuk and H. Seyfarth and H. Ströher and M. Tabidze and S. Trusov and D. Tsirkov and Yu. Uzikov and Yu. Valdau and C. Wilkin},
journal= {arXiv preprint arXiv:1307.4950},
year = {2013}
}