Document Details
Title:
CONDENSED MATTER RESEARCH AT LANSCE
Document Location:
Location - DOE/NNSA NUCLEAR TESTING ARCHIVE Address - P.O. Box 98521 City - Las Vegas State - NV Zip - 89193-8521 Phone - (702)794-5106 Fax - (702)862-4240 Email - NTA@NV.DOE.GOV
Document Type:
REPORT
Publication Date:
1990 Jan 31
Declassification Status:
Never classified
Document Pages:
0036
Accession Number:
NV0091600
Document Number(s):
LALP907
OpenNet Entry Date:
1994 Aug 27
OpenNet Modified Date:
2003 Sep 18
Description/Abstract:
THE MANUEL LUJAN, JR. NEUTRON SCATTERING CENTER (LANSCE) IS A PULSED S PALLATION NEUTRON SOURCE EQUIPPED WITH TIME-OF-FLIGHT SPECTROMETERS FO R CONDENSED-MATTER-SCIENCE RESEARCH. NEUTRON SCATTERING IS A POWERFUL TECHNIQUE FOR PROBING THE MICROSCOPIC PROPERTIES OF CONDENSE MATTER B ECAUSE THE ENERGIES AND THE WAVELENGHTS OF THERMAL NEUTRONS ARE CLOSEL Y MATCHED TO TYPICAL EXCITATION ENERGIES AND INTERATOMIC DISTANCES IN SOLIDS AND LIQUIDS. BECAUSE NEUTRON SCATTERING CROSS SECTIONS DO NOT VARY IN A SYSTEMATIC MANNER WITH THE ATOMIC NUMBER OF A SCATTERING NU CLEUS, NEUTRONS AND X-RAYS CAN PROVIDE COMPLEMENTARY STRUCTURAL INFORM ATION. THE ISOTOPIC DEPENDENCE OF NEUTRON-SCATTERING CROSS SECTIONS IS PARTICULARLY IMPORTANT IN BIOLOGICAL STUDIES BECAUSE BOTH HYDROGEN AN D DEUTERIUM SCATTER NEUTRONS STRONGLY BUT WITH DIFFERENT CROSS SECTION S. THE FACT THAT THE NEUTRON MAGNETIC MOMENT COUPLES TO UNPAIRED ELECT RONS IN A SCATTERING SAMPLE MAKES NEUTRONS AN IDEAL PROBE FOR MICROSCO PIC MAGNETIC PHENOMENA.