Detectors on Left HRS

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Page under construction (July 2021)

Goals and Purpose for L-HRS during the SBS era.

Used for the HCAL calibration. Want to measure the HCAL detector efficiency by using pi+ production in gamma p -> pi+ n, as well as ep-> e' p. The pion on L-HRS is a tag for a neutron. It is a single arm trigger. It needs to be clean to 0.5% level or know the contamination on similar level. We need to remove the proton and positron backgrounds. The L-HRS is also needed for the next hypernuclear experiments (E12-15-008, E12-20-013) in hall A.



Gas Cerenkov

Pion Rejector

A1 Aerogel information

Performance in 2018 ....

A1 analysis examples in 2018 .... .... ....

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