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Unformatted text preview: The Use of Neutron scattering in Bio-Physics Ramesh Paudyal Department of Physics University of Cincinnati Cincinnati, Ohio 45221 November 28, 2001 Abstract Method of neutron scattering has proven to be the most important a unique technique for elucidating the structure and dynamics of matter. In this paper, small angle neutron scattering experiment most often used in Bio- Physics research has been discussed. 1 A neutron is one of the fundamental spin 1 2 neutral particle that make up matter. Neutron was identified in 1930s that resides in the nuclues of a typical atom along with proton. The magnetic moment of neutron is -1.913 nuclear magneton. The compositon of neutron is very high, that is more than the half of all visible matter present in the universe. The pioneering work of neutron scattering was performed by Wollan and Shull in 1946. Neutron Scattering is one of a unique and powerful tool to charatercize the structure of matter. In 1994, the Nobel prize for physics was awarded to Shull and Bert Brockhouse for showing where are atoms and what atoms do. Neutron scattering provides new information those cant be obtained from other techniques such as x-ray diffraction, electron microscope and optical spectroscopies at an atomic level as well as the chemical and physical properties of matter. The most promising advances in materials science and other fields of science have been explained by research using neutron scattering technique such as high temprature supercon- ductor, plastic polymers, new magnetic materials, amorphous semiconductor used in solar cells, medicine and biology. It will be particularly valuable for studies in nano technology and nano science. Properties of Neutron 1. The de Brogile wavelength of the neutron is given the relation, = h p , p = hk = mv The de Brogile wavelength of thermal neutrons is comparble to atomic spacings. The energy of a neutron is purely kinetic energy because the neutron has a finite mass (m n = 1.673 10- 27 kg), E = mv 2 2 = k B T, E(mev) = 81 . 799 2 h = 6 . 626 10- 34 Js , v = velocity of neutrons ( measured...
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This note was uploaded on 01/08/2012 for the course PHYSICS 707 taught by Professor Electrodynamics during the Fall '11 term at LSU.
- Fall '11