Data on the production of antiprotons at an angle of 40° in the laboratory system in collisions of 50-GeV protons with C, Al, Cu, and W nuclear targets have been obtained in the SPIN experiment (IHEP, Protvino, Russia). Invariant cross sections have been measured at transverse momenta up to p_T ≈ 2.6 GeV/c. The an-alysis of the momentum spectra has shown that multinucleon (multiquark) configurations inside a nucleus are involved in the production of antiprotons.

中文翻译：

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50GeV质子束与原子核碰撞40°角高横向动量反质子的产生特征

SPIN 实验（俄罗斯普罗特维诺高能物理研究所）获得了实验室系统中 50 GeV 质子与 C、Al、Cu 和 W 核靶碰撞时以 40° 角产生反质子的数据。在高达 p _T ≈ 2.6 GeV/ c的横向动量下测量了不变横截面。动量谱分析表明，原子核内的多核子（多夸克）构型参与了反质子的产生。