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First direct search for 2ε and εβ+ decay of 144Sm and 2β- decay of 154Sm.

Authors :
Belli, P.
Bernabei, R.
Boiko, R. S.
Cappella, F.
Caracciolo, V.
Cerulli, R.
Danevich, F. A.
Di Marco, A.
Incicchitti, A.
Kropivyansky, B. N.
Laubenstein, M.
Nisi, S.
Poda, D. V.
Polischuk, O. G.
Tretyak, V. I.
Source :
European Physical Journal A -- Hadrons & Nuclei; Nov2019, Vol. 55 Issue 11, p1-8, 8p
Publication Year :
2019

Abstract

The first direct search for the double electron capture ( 2 ε ) and the electron capture with positron emission ( ε β + ) in <superscript>144</superscript>Sm to the ground state and to the excited levels of <superscript>144</superscript>Nd was realized by measuring --over 1899h-- a 342g sample of highly purified samarium oxide (Sm<subscript>2</subscript>O<subscript>3</subscript>) with the ultra-low background HP-Ge γ spectrometer GeCris (465cm<superscript>3</superscript>) at the STELLA facility of the Gran Sasso National Laboratory (LNGS). No effect was observed and half-life limits were estimated at the level of T 1 / 2 ∼ (0. 1 - 1. 3) × 10 20 yr (90% C.L.). Moreover, for the first time half-life limits of the double beta ( 2 β - ) decay of <superscript>154</superscript>Sm to several excited levels of <superscript>154</superscript>Gd have been set; they are at the level of T 1 / 2 ∼ (0. 06 - 8) × 10 20 yr (90% C.L.). [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
14346001
Volume :
55
Issue :
11
Database :
Complementary Index
Journal :
European Physical Journal A -- Hadrons & Nuclei
Publication Type :
Academic Journal
Accession number :
140934331
Full Text :
https://doi.org/10.1140/epja/i2019-12911-3