DIRECT ELECTRONIC DECAY OF THREE $pi$$sup 0$'S EMITTED FROM AN ANTINEUTRON ANNIHILATION STAR
Continuous search for antineutron annihilation events in an antiproton stack leads to the discovery of a star of 10 + 15n-bar. Of the fifteen shower particles of this star, twelve are identified as electrons and three as pions. A negative pion among the three comes to rest. The ten heavy prongs contain only evaporation protons. All the protons come to rest in the emulsion and each proton has a kinetic energy less than 15 Mev. Dividing the twelve electrons into three groups and assuming each group as the decay of pi /sup 0/ yields e/sup +/ + e/sup -/ + e/sup +/ + e/sup -/, one can evaluate the masses of the three pi / sup o/'s respectively, as (136 plus or minus 14), (135 plus or minus 14), and (136 plus or minus 13) Mev. The probability for the simultaneous decay of three ordinary pi /sup 0/'s is only 4 x 10/sup -14/. This event suggests the possibility of a new process for the production of electrons, e.g., the existence of a second pi /sup 0/. Considering the high multiplicity, the wide angular distribution and the right average energy of the pions as well as the total energy of the star, one concludes tbat this event is the result of an annhilation between an antineutron and a nucleon. A small-cell technique is Proposed for the measurement of the multiple scattering of the inclined minimum-ionizing tracks. (auth)
- Research Organization:
- Faculte des Sciences, Paris
- NSA Number:
- NSA-15-029900
- OSTI ID:
- 4836123
- Journal Information:
- Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B, Vol. Vol: (10), 20; Other Information: Orig. Receipt Date: 31-DEC-61
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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