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Manuscript Title: EMI2, the counting efficiency for electron capture by a KL1L2L3M model.
Authors: A. Grau Malonda, A. Grau Carles, P. Grau Carles, G. Galiano Casas
Program title: EMI2
Catalogue identifier: ACPU_v2_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 123(1999)114
Programming language: Fortran.
Computer: IBM with 80386 processor.
Operating system: MS-DOS.
RAM: 30K words
Word size: 32
Keywords: Atomic physics, Experiment, Radioactivity, Liquid scintillation, Counting, Electron capture, Coster-kronig emission.
Classification: 2.3.

Nature of problem:
The standardization of electron capture (EC) nuclides in liquid scintillation detectors is never 100 per cent efficient, depending on several factors such as ionization or chemical quench. A complete description of the EC process is not possible to achieve due to the large number of involved atomic rearrangement pathways. In the first version of the program EMI, an oversimplified KLM model of only 22 pathways was applied. However, a better accuracy in the standardizations, especially for nuclides of low atomic numbers, requires one to include Coster-Kronig transitions, and therefore Li-subshells.

Solution method:
The atomic rearrangement process for the KL1L2L3M model is described by a set of 264 different equations. This number suggests the convenience of a code for computing all equations.

We assume that the five M subshells are averaged. The atomic rearrangement for M and higher shells is not considered.

Running time:
The test run requires about 15 s on a Pentium II PC.