液体ヘリウム中の反陽子のトラッピング

概要

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It is known that when antiprotons are implanted into liquid ^4He with a low energy of 5.6 MeV, a very small fraction 3.6% of them has an extraordinary long lifetime in the order of a few microseconds at the longest. This delayed fraction "q" should reflect the distribution of angular momentum l of f(l) with respect to a ^4He atom or the annihilation center of each. The present concern is whether f(l) is a statistical distribution or not, how does the interaction potential influence on f(l), and how small the q-value is. Taking into account the energy dissipation by means ofelectronic stopping power measured and an interaction potential derived by the Molecular Orbital theory, we simulate the classical trajectories of implanted into ^4He with an energy of 1MeV. We obtained three conclusions : The fraction of the statistical distribution was 68%. The interaction potential decisively determined the f(l). The delayed fraction was evaluated as q=3%.
岡山理科大学の論文