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A calculation of the energy lost by antiprotons stopping in water shows that the radiation transferred is localized within 1 mm of the stopping point. This "focusing" of the radiation is mainly due to heavily ionizing particles emitted from the nuclei on which the annihilation takes place. At present antiproton beams for medical purposes may not be cost effective compared to other charged particle beams, but the sharpness of their radiation transfer combined with antiprotonic radiography are highly attractive and unique features that may invite special applications.

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The purpose of this note is to report the existence of marked departures from phase space in the effective-mass distributions for the H7i and KK states. We present evidence that, in about 25% of the events observed, the HTT state results from the decay of a resonant state (H ) with a mass of 1535 MeV and a full width of <35 MeV. The observed anomaly in the KK effectivemass distribution is possibly open to different interpretations. If we assume it to be due to the decay of a resonant state K*, we find that M# * = 1020 MeV, and that it has a full width of 20 MeV. However, it may also be possible to explain the effect as due to S-wave KK scattering. These results, as well as preliminary evidence concerning the properties of the E and K , are discussed below.The data for this experiment were obtained in an exposure of the BNL 20-in. hydrogen bubble chamber at the Brookhaven AGS. Details of the exposure and beam have been previously discussed. 1 Data were obtained both at 2.24 and 2.5 BeV/c. The sample reported on here consists of 79 HTT and 37 KK combinations from the following production modes:All events were measured and analyzed using the BNL TRED-KECK system. Except for Reaction (Id), 2 we believe the contamination from other topologically similar event types to be negligible. H°+7TH°+77

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