Experimental Studies of Antiprotonic Atoms in Hydrogen and Helium.

In an experiment performed at Brookhaven National Laboratory the spectra of atomic x rays from stopped antiprotons in gaseous helium, liquid hydrogen, and gaseous hydrogen were measured. The measurements were performed at 1 atmosphere and 25(DEGREES)K for the gaseous target. In the case of He the L and M series of p were observed and relative intensities measured. However in hydrogen no x rays were observed and thus only an upper limit of the yields of the K series in liquid and gaseous hydrogen were calculated.