Programs in Physics & Physical Chemistry
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|Manuscript Title: A computer program for nuclear lifetimes measurements by DSAM using a self supporting target.|
|Authors: C. Morand, T.-U. Chan|
|Program title: DSAMER|
|Catalogue identifier: ABQM_v1_0|
Distribution format: gz
|Journal reference: Comput. Phys. Commun. 23(1981)393|
|Programming language: Fortran.|
|Computer: CDC 6600.|
|Operating system: NOS/BE 1.|
|RAM: 4K words|
|Word size: 60|
|Keywords: Nuclear physics, Gamma spectroscopy, Apparatus design, Nuclear physics, Gamma spectroscopy, Apparatus design, Nuclear level lifetimes, Doupler shift Attenuation method, Line shape fit, Nuclear stopping powers, Recoiling nuclei Velocity: Beta=one per cent.|
|Classification: 17.1, 17.4.|
Nature of problem:
DSAM for nuclear lifetime measurements needs accurate nuclear stopping powers. Using self supporting targets and known long-lived levels, DSAM satisfies that condition and thus provides rather good lifetime measurements.
For given lifetime and stopping powers, the line shape of the Doppler Doppler distorted gamma-ray is built up by taking into account successively the
- particle evaporation (n,p,alpha)
- slowing-down of the recoiling nuclei in the target,
- different feeding laws of the studied levels,
- energy response of the GeLi detector used (including solid angle correction).
The best fit of the experimental line is chosen by the chi-square criterion.
- Number of evaporated particles must be <=3, (2 alpha maximum), - range of lifetime measurements: 0.02 ps< tau < 5ps, - typical recoiling ions initial velocity : Beta =1%, typical nuclei mass and target: 50 < A < 80, typical target thickness: 1 mg/cmsq, - number of mixed gamma rays to be analyzed must be <=2.
About 1/2 s for one line-shape fit.
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