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Manuscript Title: CAPMULT, the counting efficiency for electron capture by a KLMN four- shell model.
Authors: G. Galiano Casas, A. Grau Carles, A. Grau Malonda
Program title: CAPMULT
Catalogue identifier: ADBH_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 87(1995)432
Programming language: Fortran.
Computer: IBM AT 80386.
Operating system: MS-DOS 3.30 and higher.
RAM: 22K words
Word size: 32
Keywords: Nuclear physics, Activity detection, Electron capture, Counting efficiency, Liquid scintillation, Klmn-shell model.
Classification: 17.6.

Nature of problem:
The computation of the liquid scintillation counting efficiency for electron capture nuclides (EC) requires the determination of the atomic pathways that follow the capture of one electron by the nucleus. The large number of different ways of atomic rearrangement in the daughter nuclide makes necessary the use of shell models in which subshells are averaged. A KLM three-shell model involves only 22 pathways, but it is inaccurate for nuclides of high atomic numbers. We propose a more advanced model with 262 pathways in which N-shell is included.

Solution method:
The determination of the probabilities and effective energies for all pathways requires the prior evaluation of their analytical expressions. Since the number of expressions is large for a KLMN-model, we achieve all these expressions by using a computer program.

We average L, M and N subshells. We do not consider the atomic rearrangement for N and outer shells.

Running time:
The test run requires about 4 minutes on an IBM AT.