PHYS01200804001 Sohrab Abbas - Homi Bhabha National Institute
PHYS01200804001 Sohrab Abbas - Homi Bhabha National Institute
PHYS01200804001 Sohrab Abbas - Homi Bhabha National Institute
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
CHAPTER 5<br />
High precision determination of the neutron coherent scattering length<br />
5.0 Introduction<br />
Neutron interferometry as alluded to earlier, affords the most precise determination of the coherent<br />
scattering length. Dynamical diffraction of neutrons in a single crystal enables splitting of the<br />
neutron wave amplitude into two coherently coupled subbeams separated by a few cm. Insertion of<br />
a sample into one of the beam paths introduces a phase shift proportional to the optical path<br />
neutrons<br />
H-detector<br />
sample<br />
Phase<br />
flag<br />
O-detector<br />
Fig.50 Our proposal depicting the phase measurement by recording the interferograms with the<br />
thick sample placed alternately in subbeams I and II of the symmetric LLL IFM.<br />
91