Influence of neutrons and γ-rays in the Fréjus underground laboratory on the NEMO experiment
Nucl. Instr. and Meth. in Phys. Res. A457 (2001) pp. 487-498
To be sensitive to an effective Majorana neutrino mass, 〈mν〉,
on the order of 0.1 eV, the NEMO 3
double beta (ββ(0ν)) decay experiment
requires precise knowledge and control of the backgrounds.
The effect of neutrons and γ-rays from the Fréjus underground laboratory
(LSM, Laboratoire Souterrain de Modane)
has been studied during 10 700 h of data collection.
The data were taken with a NEMO 2 prototype detector
using different shield configurations.
Monte Carlo calculations with GEANT/MICAP code
and a new library of γ-rays from neutron captures are presented.
The implied consequences for the NEMO 3 detector
which is under construction are discussed.
The neutrinoless double beta decay background induced by
neutrons and γ-rays within the LSM will be suppressed
to the very suitable level of 0.1 event in a life time of
five years given the appropriate shield and magnetic field.
Cite article as:
. NEMO Collaboration, "Influence of neutrons and γ-rays in the Fréjus underground laboratory on the NEMO experiment", Nucl. Instr. and Meth. in Phys. Res. A457 (2001) pp. 487-498 (2001)