https://doi.org/10.1051/epjconf/20100303006
Pionic Deuterium
1
Institut für Kernphysik, Forschungszentrum
Jülich, D–52425
Jülich,
Germany
2
Dept. of Physics, Coimbra University,
P-3000
Coimbra,
Portugal
3
Dept. of Materials Science and Engineering, University of
Ioannina, GR-45110
Ioannina,
Greece
4
Stefan Meyer Institut for Subatomic Physics, Austrian Academy
of Sciences, A-1090
Vienna,
Austria
5
Zentralabteilung für Elektronik, Forschungszentrum Jülich
GmbH, D-52425
Jülich,
Germany
6
Laboratoire Kastler Brossel, UPMC-Paris 6, ENS, CNRS; Case
74, 4 place
Jussieu, F-75005
Paris,
France
7
Laboratory for Particle Physics, Paul Scherrer
Institut, CH–5232
Villigen,
Switzerland
8
Dept. of Physics, Aveiro University,
P-3810
Aveiro,
Portugal
a present address: Dept. of Physics, Aveiro
University, P-3810 Aveiro, Portugal
b
corresponding author:
d.gotta@fz-juelich.de
c present address: Universitätsklinik für
Nuklearmedizin, Medizinische Universität Wien, 1090 Vienna, Austria
d present address: Inst. des NanoSciences de
Paris, CNRS UMR7588 and UMPC-Paris 6, F-75015 Paris, France
The strong interaction shift ε1sπD and broadening Γ1sπD in pionic deuterium have been remeasured with high statistics by means of the πD(3p − 1s) X-ray transition using the cyclotron trap and a high-resolution crystal πD πD spectrometer. Preliminary results are ε1sπD = (−2325 ± 31) meV (repulsive) and Γ1sπD(1171+23-49) meV which yields for the πD scattering length aπD = [−(24.8 ± 0.3) + i (6.3-0.3+0.1)] · 10−3 mπ−1. From the imaginary part the threshold parameter for pion production is determined to be α = (252−11+15) µb.
© Owned by the authors, published by EDP Sciences, 2010