Speaker
Dr
Alexander Barabash
(NIC «Kurchatov Institute» - ITEP, B. Cheremushkinskaya 25, 117218 Moscow, Russia)
Description
Triple beta decay of 150Nd to the ground and excited states of 150Eu and quadruple beta decay of 150Nd to the excited states of 150Gd have been studied using a 400 cm3 low-background HPGe detector and an external source consisting of 3046 g of natural Nd2O3 powder. A half-life limit for the quadruple beta decay to the 01+ state of 150Gd was found to be T1/2 (0ν+4ν) > 8.7x10^20 yr (90% C.L.). This is ~ 5 times more strong limit than previous result [Phys. Rev. C 98 (2018) 055501]. For other (0ν+4ν) transitions to the 2_1^+, 3_1^-, 4_1^+, 2_2^+ and 2_3^+ excited states limits for the first time have been obtained at the level of ∼ 6.1-9.5x10^20 yr (90% C.L.). We report here also the results for the first search for triple beta decay to the ground and excited final states of 150Eu. We find no evidence of this decay and set lower limits on the half-life in the range T1/2 (0ν+3ν) > (0.04-4.8)x10^20 yr (90% C.L.). Possible future experiments with more higher sensitivity are discussed.
Primary author
Dr
Alexander Barabash
(NIC «Kurchatov Institute» - ITEP, B. Cheremushkinskaya 25, 117218 Moscow, Russia)
Co-authors
Prof.
Abdellatife Nachab
(Département de physique, Faculté Poly-disciplinaire de Safi, Université Cadi Ayyad, Route Sidi Bouzid BP 4162, 46000 Safi, Morocco)
Dr
Philippe Hubert
(CENBG, Université de Bordeaux, CNRS/IN2P3, F-33175 Gradignan, France)
Dr
Vladimir Umatov
(NIC «Kurchatov Institute» - ITEP, B. Cheremushkinskaya 25, 117218 Moscow, Russia)
