
Accession Number : AD0654929
Title : NON LINEAR LEAST SQUARES COMPUTER ANALYSIS OF MOSSBAUER TRANSMISSION SPECTRA,
Corporate Author : ILLINOIS UNIV URBANA DEPT OF PHYSICS
Personal Author(s) : Chrisman,Bruce L. ; Tumolillo,Thomas A.
Report Date : MAR 1967
Pagination or Media Count : 64
Abstract : It is known that computer programs which utilize blind search and maximum slope methods to fit a nonlinear Nparameter function to experimental Mossbauer data are slow and unreliable, and if N is 'large,' say N > 10 they cannot be used. The Hartleymodified GaussNewton method for fitting nonlinear functions by least squares and was applied to the fitting of Mossbauer data. Using this modified GaussNewton method, computer running time was reduced by roughly a factor of 20, and it was possible to fit functions with as many as 30 parameters in a few minutes.
Descriptors : (*MOSSBAUER EFFECT, LEAST SQUARES METHOD), (*GAMMA RAY SPECTROSCOPY, COMPUTER PROGRAMS), EXPERIMENTAL DATA, NONLINEAR SYSTEMS, NUMERICAL ANALYSIS, FUNCTIONS(MATHEMATICS), FLOW CHARTING, SUBROUTINES
Subject Categories : Radiation and Nuclear Chemistry
Computer Programming and Software
Nuclear Physics & Elementary Particle Physics
Distribution Statement : APPROVED FOR PUBLIC RELEASE