Letter: Left in a spin

From Ron Barnes

Anil Ananthaswamy’s excellent article on separating a neutron from its spin left me greatly puzzled (26 July, p 32).

Is a neutron without its spin still a neutron, I wonder, or is it something else?

Watlington, Norfolk, UK

The editor replies:

• The question is a really good one. The honest answer is that this is so new nobody has a name for a neutron without a spin, or indeed a spin without a neutron.