https://doi.org/10.1140/epjc/s10052-018-6295-x
Regular Article - Experimental Physics
Final results on 
double beta decay to the ground state of 
from the NEMO-3 experiment
1
IPHC, ULP, CNRS/IN2P3, 67037, Strasbourg, France
2
LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405, Orsay, France
3
NRC “Kurchatov Institute”, ITEP, 117218, Moscow, Russia
4
UCL, London, WC1E 6BT, UK
5
University of Manchester, Manchester, M13 9PL, UK
6
JINR, 141980, Dubna, Russia
7
National Research Nuclear University MEPhI, 115409, Moscow, Russia
8
Aix Marseille Université, CNRS, CPPM, 13288, Marseille, France
9
Idaho National Laboratory, Idaho Falls, ID, 83415, USA
10
CENBG, Université de Bordeaux, CNRS/IN2P3, 33175, Gradignan, France
11
University of Texas at Austin, Austin, TX, 78712, USA
12
LPC Caen, ENSICAEN, Université de Caen, CNRS/IN2P3, 14050, Caen, France
13
LAPP, Université de Savoie, CNRS/IN2P3, 74941, Annecy-le-Vieux, France
14
Institute of Experimental and Applied Physics, Czech Technical University in Prague, 12800, Prague, Czech Republic
15
University of Warwick, Coventry, CV4 7AL, UK
16
Osaka University, 1-1 Machikaneyama Toyonaka, Osaka, 560-0043, Japan
17
Saga University, Saga, 840-8502, Japan
18
Laboratoire Souterrain de Modane, 73500, Modane, France
19
FMFI, Comenius University, 842 48, Bratislava, Slovakia
20
LSCE, CNRS, 91190, Gif-sur-Yvette, France
21
Imperial College London, London, SW7 2AZ, UK
22
Institut Universitaire de France, 75005, Paris, France
23
Jyväskylä University, 40351, Jyväskylä, Finland
24
MHC, South Hadley, MA, 01075, USA
25
Institute for Nuclear Research, Kyiv, 03028, Ukraine
26
Charles University in Prague, Faculty of Mathematics and Physics, 12116, Prague, Czech Republic
27
Present address: Boston University, Boston, MA, 02215, USA
* e-mail: jmott@hep.ucl.ac.uk
Received:
17
June
2018
Accepted:
28
September
2018
Published online:
11
October
2018
Using data from the NEMO-3 experiment, we have measured the two-neutrino double beta decay (
) half-life of 
Se as 
y under the single-state dominance hypothesis for this nuclear transition. The corresponding nuclear matrix element is 
. In addition, a search for neutrinoless double beta decay (
) using 0.93 kg of Se observed for a total of 5.25 y has been conducted and no evidence for a signal has been found. The resulting half-life limit of 
for the light neutrino exchange mechanism leads to a constraint on the effective Majorana neutrino mass of 
, where the range reflects nuclear matrix element values from different calculations. Furthermore, constraints on lepton number violating parameters for other mechanisms, such as right-handed currents, majoron emission and R-parity violating supersymmetry modes have been set.
© The Author(s), 2018
