Experimental Determination of the Branching Ratios ~ and 27 at Rest

The branching ratios of p/5 annihilations into the neutral final states 2n ~ n~ and 27 are mea- sured by stopping antiprotons in liquid hydrogen. They are B2~o=(2.06+_0.14 )x 10 -4 , B~o~=(1.74 _+0.22) x 10 -s, and B~< 1.7 x 10 -6 (95% c.1.).