title: Reprint of experiments and theory of (138)La radioactive decay.
abstract: We measured with unprecedented accuracy key features of the (138)La 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 (138)La 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.
authors: AP, RST, FAME, Delft University of Technology, Mekelweg 15, 2629JB Delft, The Netherlands; Gonitec BV, J. Bildersstraat 60, 2596EJ, Den Haag, The Netherlands. Electronic address: f.g.a.quarati@tudelft.nl.
authors: F G A
authors: FGA
authors: Quarati
authors: AP, RST, FAME, Delft University of Technology, Mekelweg 15, 2629JB Delft, The Netherlands.
authors: P
authors: P
authors: Dorenbos
authors: CEA, LIST, Laboratoire National Henri Becquerel, Bât. 602 PC111, CEA-Saclay 91191 Gif-sur-Yvette Cedex, France.
authors: X
authors: X
authors: Mougeot
keywords: Electron capture probability ratios; Exchange effect; La-138; Q value; β spectrum