Author/Authors :
adib, m. atomic energy authority - nrc - reactor physics department, Egypt , habib, n. atomic energy authority - nrc - reactor physics department, Egypt , bashter, i. i. zagazig university - faculty of science - physics department, Egypt , morcos, h. atomic energy authority - nrc - reactor physics department, Egypt , el-mesiry, m. s. atomic energy authority - nrc - reactor physics department, Egypt , saleh, a. higher technological institute, Egypt
Abstract :
A formula is given that permits the calculation of the neutron transmission through bulk imperfect single crystals as a function of wavelength at both room and liquid nitrogen temperatures. The formula takes into consideration the crystal structure type and the orientation of its cutting plane w. r. t. the incident neutron beam direction. The reflecting power of the Bragg reflections from the allowed (hkl) planes, are calculated, assuming that the bulk single-crystal consists of thin layers where, the extensions inside each layer are negligible. A computer code BISCF written in FORTRAN-77, has been developed to carry out the required calculations for cubic and hexagonal closed packing (HCP) crystal structure types. An overall agreement is indicated between the experimental neutron transmission data and the calculated ones. Such agreement justifies the applicability of the computer code.
Keywords :
Cu , Zn MgO imperfect single , crystals , neutron transmission
