Pion Rescattering Correction to the Decay Rate of Hyper-Triton

Abstract

The pionic decay rate of the hyper-triton is calculated, including pion rescattering effect. It is shown, that this effect is as important as the effect of the Pauli principle previously discussed by several authors.~l. 3 >, ' l The agreement with the observed decay rate is satis­ factory. ~ L Introduction Recently, the accuracy of observed decay rates of light hyper-nuclei have been greatly improved/l and detailed discussion of them has become possible. Among various decay modes, the pionic decay is the most important one for light elements. The observed decay rates are usually much different from that of the free A-hyperon, and this suggests the importance of the effects of neigh­ bouring nucleons. The most important of them will be due to the Pauli principle, and this has already been discussed by several authors. 2 J,:JJ, 4 l The purpose of this paper is to investigate another interesting effect, namely, that of the rescattering of the emitted pion by neighbouring nucleons, in the case of the hyper-triton. The reason why we choose the hyper-triton is as fol·· lows . . 1) Its non-pionic decay is very rare