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HERA (particle accelerator)
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==== HERMES ==== {{main|HERMES experiment}} The HERMES experiment in the HERA Hall East was operated from 1995 to 2007. HERA's longitudinally polarised electron beam was used to explore the [[Nucleon spin structure|spin structure of nucleons]]. For this purpose, the electrons were scattered at energies of 27.5 GeV at an internal gas target. This target and the detector itself were designed especially with a view to spin-polarised physics. The detector measured 3.5 m Γ 8 m Γ 5 m and weighed 400 tons.<ref name="HERA-point" />
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