Programs in Physics & Physical Chemistry
|[Licence| Download | New Version Template] abmn_v1_0.gz(14 Kbytes)|
|Manuscript Title: ANNA: an interactive program for analysis of one-dimensional pulse- height spectra.|
|Authors: P.A. Assimakopoulos, S. Kossionides|
|Program title: ANNA|
|Catalogue identifier: ABMN_v1_0|
Distribution format: gz
|Journal reference: Comput. Phys. Commun. 11(1976)37|
|Programming language: Fortran.|
|Operating system: ADSS-15, KM15 V5A.|
|RAM: 16K words|
|Word size: 18|
|Peripherals: magnetic tape.|
|Keywords: Nuclear physics, Analysis, Gamma-ray, Charged particle, Stripping, Peak analysis, Gaussian fit, Background fit, General experiment.|
Nature of problem:
The program is an aid in the analysis of one-dimensional nuclear data (e.g. gamma-ray spectra). It can however be used in all cases, where histogram-type data with Poisson Statistics is analyzed.
Interactive computation is employed. A portion of the data is displayed on a CRT-screen, the area of interest is indicated with the lightpen and various processing commands are executed by changing the state of the ACCUMULATOR SWITCHES. A log of all operations and results is printed on the teletype. Commands already programmed are: Control of I/O, polynomial fit to background, centroid and area of peaks, multiple (1 to 3) gaussian fit. The correct statistical errors are computed and printed along with the parameter values.
A symmetric gaussian is fitted to the data. Thus, fits to multiple peaks with high and low energy tails should be accepted with some caution.
The program is designed to run on a PDP-15 computer with the minimum of peripheral equipment, notably without a card reader or lineprinter - as is usually the case for such computers employed mainly for on-line data acquisition. (If however a lineprinter is available it can be readily employed by assigning prior to execution I/O device #2 to the lineprinter. In such a case a complete log of the operations will be kept on the lineprinter). Due to this restriction the source program is available in the form of a DECTape. The DECTape contains all source (SRC) and Binary (BIN) programs, as well as the appropriate XCT and XCU files, compiled under the CHAIN system for single-command execution. The source program is also available as a card deck.
The program is interactive and runs until stopped by the user/operator. The longest single operation recorded up to now was a double gaussian fit to a structure extending over 128 channels which took four minutes (five iterations).
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