Experimental study of CSB force in N-d scatterings at 12 MeV

Abstract

An angular distribution of the analyzing power A(sub y) of neutron-deuteron scattering at 12 MeV was measured in the center of mass angular range from 59.8 deg to 146.5 deg to study the Charge Symmetry Breaking (CSB) in the P-state nucleon-nucleon (NN) reaction. The experimental method and preliminary results have been described elsewhere. The statistical accuracy of A(sub y) was about 1.5 percent around the maximum. The difference in A(sub y) maxima between n-d and p-d scattering, Delta A(sub Nd), was extracted to study CSB of N-N interaction. The Delta A(sub Nd) value of 0.0083 +/- 0.0028 at 12 MeV was obtained, which was slightly smaller than that derived from the Triangle University National Laboratory (TUNL) data. This small value of Delta A(sub Nd) was still higher than that by the approximate Coulomb calculation.

中性子重水素散乱の12MeVでアナライジングパワーA(sub y)の角運動量を重心系で59.8度から146.5度の範囲で、P状態核子核子反応における荷電対称性の破れ(CSB)を研究する目的で測定した。実験方法や予備的結果については他の記事に記述している。また、A(sub y)の統計的誤差はその最大値の近傍で1.5%程度であった。中性子重水素散乱と陽子重水素散乱の間でのA(sub y)の極大値の差ΔA(sub y)を核子核子相互作用の荷電対称性の破れを研究する目的で求めた。12MeVでΔA(sub y)の値、0.0083±0.0028を得たが、これはトライアングル大学国立研究所でのデータから求められた値よりやや小さい値を示している。また、この小さなΔA(sub y)の値でも近似的クーロン計算によって得られる値よりまだ高い。