New limits on 2 ɛ , ɛ β + and 2 β + decay of 136Ce and 138Ce with deeply purified cerium sample

A search for double electron capture ( 2 ɛ ), electron capture with positron emission ( ɛ β + ), and double positron emission ( 2 β + ) in 136Ce and 138Ce was realized with a 465 cm3 ultra-low background HP Ge γ spectrometer over 2299 h at the Gran Sasso underground laboratory. A 627 g sample of cer...

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Bibliographic Details
Published in:The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2017-01, Vol.53 (8), p.1-8
Main Authors: Belli, P, Bernabei, R, Boiko, R S, Cappella, F, Cerulli, R, Danevich, F A, Incicchitti, A, Kropivyansky, B N, Laubenstein, M, Mokina, V M, Polischuk, O G, Tretyak, V I
Format: Article
Language:English
Subjects:
Beta decay
Cerium isotopes
Cerium oxides
Electron capture
Emission
Isotopes
Liquid-liquid extraction
Positron emission
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Summary:A search for double electron capture ( 2 ɛ ), electron capture with positron emission ( ɛ β + ), and double positron emission ( 2 β + ) in 136Ce and 138Ce was realized with a 465 cm3 ultra-low background HP Ge γ spectrometer over 2299 h at the Gran Sasso underground laboratory. A 627 g sample of cerium oxide deeply purified by liquid-liquid extraction method was used as a source of γ quanta expected in double β decay of the cerium isotopes. New improved half-life limits were set on different modes and channels of double β decay of 136Ce and 138Ce at the level of T 1 / 2 > 10 17 - 10 18 yr.
ISSN:1434-6001
1434-601X
DOI:10.1140/epja/i2017-12360-0