Revealing the secrets of composite helmets of ancient Japanese tradition

We present novel results from a non-invasive examination of two kabuto (helmets), made in Japan in the 17th century. Neutron-imaging experiments (radiography and tomography), carried out at the ICON and NEUTRA beamlines, operating at the neutron source SINQ (CH), have allowed to determine the inner metal structure and manufacturing techniques of these beautiful examples of past technology, revealing some otherwise invisible details.