非极化自旋态对~（12）C（d，2 He）反应双质子自旋相关测量的影响
Effect of the unpolarized spin state in spin-correlation measurement of two protons produced in the 12C(d,2He) reaction
摘要：
本文讨论了非极化态在~（12）C（d，~ 2 He）反应产生的$^1S_0$双质子态自旋相关测量中的影响。我们证明了在非极化态的存在下，当态的纯度小于$ \sim \verb+70%+$时，贝尔不等式的最大破坏低于经典极限.特别地，对于KVI实验，贝尔不等式的违反应该由纯$^1S_0$态的因子$\sim\verb+10%+$修正.
英文摘要：
In this note we discuss the effect of the unpolarized state in the spin-correlation measurement of the $^1S_0$ two-proton state produced in 12C(d,2He) reaction at the KVI, Groningen. We show that in the presence of the unpolarized state the maximal violation of the CHSH-Bell inequality is lower than the classical limit if the purity of the state is less than $ \sim \verb+70%+$. In particular, for the KVI experiment the violation of the CHSH-Bell inequality should be corrected by a factor $\sim\verb+10%+$ from the pure $^1S_0$ state.
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