Emission of 8Li, 9Li and 8B Fragments from Stars Produced by 4.3 Gev π−-Mesons in Nuclear Emulsion
1960 年 15 巻 10 号 p. 1753-1759
詳細
1960 年 15 巻 10 号 p. 1753-1759
9.300 stars with more than 5 black prongs were examined to study 8Li, 9Li and 8B fragments emitted from these stars. Thus, we found 90 examples of hammer tracks produced by 8Li or 8B fragments, 11 examples of tracks produced by 9Li→9Be+e−→4He+4He+n+e− and the one by 9Li→9Be+e−→5He+4He+e−.
The experimental result of angular distribution, energy distribution, and frequency of emission of these fragments are given. Comparison is made between the experimental result and the prediction of evaporation theory on the frequency of emission of these fragments. The effect of the 8B fragments on the estimation of the Coulomb barrier of the residual nucleus for 8Li fragment is discussed.
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