The LaBr3:Ce scintillator offers the unique opportunity to study the β- radioactive decay of 138La, that is a 2nd order unique forbidden transition. The 138La isotope is one of the rarest isotopes on earth (it is present as 0.09% in natural Lanthanum) and because of its extremely long lifetime, of the order of 1011 years, large amounts of 138La are needed for the measurement of the β- decay spectrum. In literature, only one experimental measurement is present and the results are not reproduced by the standard nuclear theory. A second measurement of the β- continuum is presented in this work. For this measurement, two LaBr3:Ce scintillators (3″ × 3″) and two different experimental techniques were used. The shape of the β- continuum spectrum, measured down to the energy of 2-3 keV, is found to be identical to the one previously measured and published. On the other side, it is different from the theoretical published spectrum in particular below 75 keV.

Measurement of β - decay continuum spectrum of 138La

A. Giaz;
2016-01-01

Abstract

The LaBr3:Ce scintillator offers the unique opportunity to study the β- radioactive decay of 138La, that is a 2nd order unique forbidden transition. The 138La isotope is one of the rarest isotopes on earth (it is present as 0.09% in natural Lanthanum) and because of its extremely long lifetime, of the order of 1011 years, large amounts of 138La are needed for the measurement of the β- decay spectrum. In literature, only one experimental measurement is present and the results are not reproduced by the standard nuclear theory. A second measurement of the β- continuum is presented in this work. For this measurement, two LaBr3:Ce scintillators (3″ × 3″) and two different experimental techniques were used. The shape of the β- continuum spectrum, measured down to the energy of 2-3 keV, is found to be identical to the one previously measured and published. On the other side, it is different from the theoretical published spectrum in particular below 75 keV.
2016
Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2014 IEEE
9781479960972
IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC
Seattle
2014
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/2101590
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