Experiments and theory of 138La radioactive decay

We measured with unprecedented accuracy key features of the 138La radioactive decays as β particle energy distribution from 0.5keV to the end-point and ratios of electron capture probabilities PL/PK, PM/PK and PM/PL. This was achieved by making use of LaBr3:Ce and CeBr3 scintillator detectors. The a...

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Bibliographic Details
Published in:Applied radiation and isotopes 2016-02, Vol.108, p.30-34
Main Authors: Quarati, F.G.A., Dorenbos, P., Mougeot, X.
Format: Article
Language:English
Subjects:
Computer Science
Electron capture probability ratios
Exchange effect
La-138
Modeling and Simulation
Nuclear Experiment
Physics
Q value
β spectrum
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Summary:We measured with unprecedented accuracy key features of the 138La radioactive decays as β particle energy distribution from 0.5keV to the end-point and ratios of electron capture probabilities PL/PK, PM/PK and PM/PL. This was achieved by making use of LaBr3:Ce and CeBr3 scintillator detectors. The advantage of the presented technique relies on the double role of LaBr3:Ce as source of 138La and detector medium resulting in a relatively efficient counting statistics and unaltered β energy detection. The experimental results are compared to advanced computational techniques and significant deviation is found below 20keV with the computational spectrum showing a 5% excess of β particle relative to the experimental spectrum at 10keV. •138La radioactive decays have been detected using LaBr3:Ce and CeBr3 scintillators.•Beta energy distribution and electron capture probabilities for K, L and M measured.•Experimental results are compared with advanced computational technique.•A revised value of the beta end-point is proposed.
ISSN:0969-8043
1872-9800
DOI:10.1016/j.apradiso.2015.11.080