PHYS01200804001 Sohrab Abbas - Homi Bhabha National Institute

3.4 Experimental 49
3.5 Results and Discussion 53
CHAPTER 4 First sub arcsec collimation of monochromatic neutron beam 59
4.0 Introduction 59
4.1 Bragg prism diffraction 60
4.2 Bragg prism design 63
4.3 Experimental 72
4.3.1 Bragg prism preparation 72
4.3.2 Expeiment 74
4.3.3 1st ever sub arcsec collimation 74
4.4 Applications of novel SUSANS set up 78
4.4.1 Super Ultra small angle neutron scattering (SUSANS) of a
protein sample 78
4.4.2 Coherence properties of the beam 81
4.4.3 Versatility of the instrument 85
4.5 Tightening the neutron collimation still further 89
CHAPTER 5 High precision determination of the neutron coherent scattering length 91
5.0 Introduction 91
5.1 Our proposal: Theory 92
5.1.1 Achieving high precision b c through optimisation of various parameters 99
5.1.2 Dual nondispersive phase shifter 102
5.2 EXPERIMENTAL 106
5.2.1 Recording of the interferograms 107
5.2.2 Data analysis 108