Measurement of the strong interaction parameters in antiprotonic deuterium

Antiprotonic deuterium K(alpha) X-rays were seen for the first time. Their analysis resulted in spin-averaged 1s strong interaction parameters, namely - 1050 +/- 250 eV (repulsive) for the Is shift and 1100 +/- 750 eV for the Is width. The large errors are mainly due to low statistics, In addition, values for the K(alpha)/L(alpha) and L(total)/L(alpha) yields at low pressure (20 mbar) were obtained: 0.005 +/- 0.003 and 1.34 +/- 0.05. Furthermore, a 2p mean absorption width of 80 less than or equal to Gamma(2p) less than or equal to 350 meV was deduced. The results for the Is ground state are somewhat surprising. especially the narrow 1s width which is similar to the spin-averaged antiprotonic hydrogen Is width. However, our 1s width is in agreement with low-energy scattering data [A. Zenoni et al., Phys. Lett. B 461 (1999) 413] (see preceding paper). (C) 1999 Elsevier Science B.V. All rights reserved.