Measurement of alpha-sticking probability in muon catalyzed dt fusion by X-ray method at RIKEN-RAL muon facility

Abstract

At the RIKEN (Institute of Physical and Chemical Research)-RAL (Rutherford-Appleton Laboratory) Muon facility, K(sub alpha) X ray yield per fusion for muon catalyzed fusion in solid or liquid D-T (Deuterium-Tritium) mixture were measured as a function of tritium concentration. The muon to alpha sticking probability omega(sub s) was determined from the measured results by using calculated values of the number of X-rays emitted from (mu alpha)(+) recoil ions. The obtained value was compared with omega(sub s) determined from the muon loss probability obtained from neutron measurement. The omega(sub s) in the dt fusion determined from neutron measurement is around 0.45 percent. While, K(sub alpha) X ray yield per fusion in dt fusion was 0.24 percent. The omega(sub s) converted from this value was between 0.45 and 0.56 percent depending on the calculation selected. It could be concluded the both neutron and X-ray measurements show omega(sub s) values below or around 0.50 percent, which were significantly smaller than the theoretical values of around 0.60 percent.

RIKEN(理化学研究所)-RAL(ラザフォード・アップルトン研究所)ミューオン施設において、固体または液体のd-t(重水素-3重水素)混合物におけるミュー粒子触媒dt核融合で、核融合あたりのK(subα)X線収量をトリチウム濃度の関数として測定した。測定結果を基に、(μα)(+)反跳イオンから放出されるX線量の計算値を用いて、ミュー粒子のα粒子への付着確率ω(sub s)を求めた。また、中性子の測定から得たミュー粒子損失確率により求めたω(sub s)と比較した。中性子測定から求めたdt融合における付着確率ω(sub s)は、約0.45%であった。一方、dt融合からの1融合当たりのX線収量は0.24%となり、この値を有効ミュー粒子付着確率ω(sub s)に換算すると、選んだ計算値に依存して0.45?0.56%になった。中性子およびX線測定から得たω(sub s)は、共に約0.50%またはそれ以下となり、理論値の約0.60%よりかなり小さいと結論できる。