Thermal Neutron Scattering Cross Section Measurements of Heavy

Thermal Neutron Scattering Cross Section Measurements of Heavy Water 2014 CAP Congress Sudbury, Ontario 2014 -06 -19 • G. Li (AECL) • G. Bentoumi (AECL) • L. Li (AECL) • B. Sur (AECL) • Z. Tun (NRC- CNBC) UNRESTRICTED / ILLIMITÉ

Cross Section Total cross section Differential Double Differential UNRESTRICTED / ILLIMITÉ

Neutrons in the Reactor UNRESTRICTED / ILLIMITÉ 3

Super-Critical Water Reactor (SCWR) up to 650 ℃ SCWR up to 350 ℃ Picture courtesy of I. L. Pioro UNRESTRICTED / ILLIMITÉ 4

Triple Axis Spectrometer AECL - OFFICIAL USE ONLY / À USAGE EXCLUSIF - EACL 5

Triple Axis Spectrometer Picture courtesy of J. Root(CNBC) UNRESTRICTED / ILLIMITÉ 6

: Total Cross Section Sample Detector Beam UNRESTRICTED / ILLIMITÉ 7

: Total Cross Section AECL 2013 UNRESTRICTED / ILLIMITÉ 8

Normalization by Vanadium target sample UNRESTRICTED / ILLIMITÉ Vanadium 9

Normalization Equation Scattering Law Representation of : momentum transfer equivalent; UNRESTRICTED / ILLIMITÉ : energy transfer equivalent

AECL 2013 UNRESTRICTED / ILLIMITÉ 11

AECL 2013 UNRESTRICTED / ILLIMITÉ

Summary Achievements: Reproduced the measurements of • • • Issues: Multiple scattering Plans: • Simulations using Geant 4 and MCNP • Going to supercritical conditions UNRESTRICTED / ILLIMITÉ 14