Pionic Deuterium

nucl-ex

/ Authors

Th. Strauch, F. D. Amaro, D. F. Anagnostopoulos, P. B"\uhler, D. S. Covita, H. Gorke, D. Gotta, A. Gruber, A. Hirtl, P. Indelicato

and 9 more authors

E. -O. Le Bigot, M. Nekipelov, J. M. F. dos Santos, Ph. Schmid, S. Schlesser, L. M. Simons, M. Trassinelli, J. F. C. A. Veloso, J. Zmeskal

/ Abstract

The strong interaction shift and broadening in pionic deuterium have been remeasured with high statistics by means of the (3p-1s) X-ray transition using the cyclotron trap and a high-resolution crystal spectrometer. Preliminary results are (-2325+/-31) meV (repulsive) for the shift and (1171+23/-49} meV for the width, which yields precise values for the pion-deuteron scattering length and the threshold parameter for pion production.