Argonne PowerPoint Presentation - Spallation Neutron Source

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Neutrons and Neutron Sources James Chadwick discovered the neutron in 1932. In 1936 Mitchel & Powers and Halban & Preiswerk first demonstrated coherent neutron diffraction in (Bragg scattering by crystal lattice planes) as an exercise in wave mechanics. The possibility of using the scattering of neutrons as a probe of materials developed after 1945 with the availability of copious quantities of slow neutrons from reactors. Fermi's group used Bragg scattering to measure nuclear crosssections at early Argonne reactors. The neutron is a weakly interacting, non-perturbing probe with simple, wellunderstood coupling to atoms and spins. The scattering experiment tells you about the sample not the probe. 98-6245 uc/vlb 2
Neutrons and Neutron Sources-cont’d A reactor moderates the neutrons produced in the fission chain reaction resulting in a Maxwellian energy distribution peaked at T (300K). “Thermal” neutrons: 98-6243 uc/rfg 3
Page 1: Neutron Sources for Materials Resea
Page 5 and 6: How do we produce neutrons? Fission
Page 7 and 8: Neutrons: Where do they come from?
Page 9 and 10: Neutrons: Where do they come from?
Page 11 and 12: Types of Neutron Sources The Instit
Page 13 and 14: Types of Neutron Sources-cont’d L
Page 15 and 16: How Do Moderators Work? Steady sour
Page 17 and 18: How Do Moderators Work? Pulsed sour
Page 19 and 20: Spallation-Evaporation Production o
Page 21 and 22: Types of Neutron Sources-cont’d P
Page 23 and 24: History The Materials Testing Accel
Page 25 and 26: MTA-cont’d Cutaway View of Linear
Page 27 and 28: Pulsed Spallation Neutron Source Co
Page 29 and 30: The Spallation Neutron Source The
Page 31 and 32: SNS Moderator Intensities and Pulse
Page 33: End of Presentation Thank you! 33

Argonne PowerPoint Presentation - Spallation Neutron Source

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