How neutron spins behave

Here D7 is shown in its spin-flip (SF) configuration.

• Unpolarised neutrons are reflected by the graphite monochromator.
• The incident neutron beam is polarised by the supermirror bender polariser.
• For measurement of SF cross-sections, the neutrons are spin flipped by the flipper.
  Flipper is turned off when measuring non spin-flip (NSF) cross-sections.
• The neutrons are reflected and also partially spin-flipped by the sample.
• The spin-up neutrons are transmitted and spin-down neutrons are absorbed the supermirror bender analyser before being detected.