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, G. Gosta, F. Camera, S. Riboldi, N. Blasi, A. Bracco, S. Brambilla, B. Million - In: Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2014 IEEE[s.l] : IEEE, 2016 Mar 10. - ISBN 9781479960972. - pp. 1-4 (( convegno IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC tenutosi a Seattle nel 2014 [10.1109/NSSMIC.2014.7431201].

Measurement of β - decay continuum spectrum of 138La

A. Giaz
Primo
;
F. Camera;S. Riboldi;A. Bracco;
2016-03-10

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.
Nuclear and High Energy Physics; Radiology, Nuclear Medicine and Imaging
Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
Settore ING-INF/01 - Elettronica
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/461932
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