Decay and capture of slow mesons in dielectrics.

摘要: Conversi, Pancini and Piccioni1, others2, observed decay electrons from positive mesons coming to rest in solids of either light or heavy elements. For negative mesons, however, were found elements only ; for it is generally assumed that are captured by atomic nuclei before they can decay. The absence capture be understood as being due the influence Coulomb repulsion3 its has led Fermi, Teller Weisskopf4 conclusion interaction between much weaker than was hitherto. These authors show takes less 10-12 sec. a meson reach an energy about 1,000 eV., where velocity equal outer orbits, is, 108 cm./sec. They then consider quickly loses remaining energy, reaching K-orbit nucleus It should 10-18 if current ideas correct. In doing so have, considerably overestimated transfer slow electrons5. present communication reasons given believing dielectrics time required longer estimated Fermi et al., but would very difficult decide theoretical considerations whether this may same order ( 2 106 sec.).