Short range correlated nucleon pairs can explain enhanced sub-threshold production of strange and charmed hadrons in proton-nucleus collisions, with the SRC tail raising yields by up to 10^3 versus a Fermi gas.
Deep sub-threshold $\Xi^-$ production in Ar+KCl reactions at 1.76A GeV
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abstract
We report first results on a deep sub-threshold production of the doubly strange hyperon $\Xi^-$ in a heavy-ion reaction. At a beam energy of 1.76A GeV the reaction Ar+KCl was studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. A high-statistics and high-purity $\Lambda$ sample was collected, allowing for the investigation of the decay channel $\Xi^- \to \Lambda \pi^-$. The deduced $\Xi^-/(\Lambda+\Sigma^0)$ production ratio of $(5.6 \pm 1.2 ^{+1.8}_{-1.7})\cdot 10^{-3}$ is significantly larger than available model predictions.
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The influence of nuclear short range correlations on sub-threshold particle production in proton-nucleus collisions
Short range correlated nucleon pairs can explain enhanced sub-threshold production of strange and charmed hadrons in proton-nucleus collisions, with the SRC tail raising yields by up to 10^3 versus a Fermi gas.