Background study of the AMoRE-pilot experiment

Agrawal, A.; Alenkov, V.V.; Aryal, P.; Beyer, J.; Bhandari, B.; Boiko, R.S.; Boonin, K.; Buzanov, O.; Byeon, C.R.; Chanthima, N.

doi:10.1016/j.astropartphys.2024.102991

Background study of the AMoRE-pilot experiment

AMoRE

Collaboration

Jan 15, 2024

Published in:

Astropart.Phys. 162 (2024) 102991

Published: May 23, 2024

e-Print:

2401.07476 [nucl-ex]

DOI:

10.1016/j.astropartphys.2024.102991 (publication)

Experiments:

AMORE

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Abstract: (Elsevier B.V.)

We report a study on the background of the Advanced Molybdenum-Based Rare process Experiment (AMoRE), a search for neutrinoless double beta decay (

0 ν β β

) of ¹⁰⁰Mo. The pilot stage of the experiment was conducted using

\sim

1.9 kg of

^{48 depl}

Ca

^{100}

MoO

_{4}

crystals at the Yangyang Underground Laboratory, South Korea, from 2015 to 2018. We compared the measured

β / γ

energy spectra in three experimental configurations with the results of Monte Carlo simulations and identified the background sources in each configuration. We replaced several detector components and enhanced the neutron shielding to lower the background level between configurations. A limit on the half-life of

0 ν β β

decay of ¹⁰⁰Mo was found at

T_{1 / 2}^{0 ν} \geq 3.0 \times 1 0^{23}

years at 90% confidence level, based on the measured background and its modeling. Further reduction of the background rate in the AMoRE-I and AMoRE-II are discussed.

Neutrino
Neutrinoless double beta decay
Majorana neutrino
Low temperature detector
AMoRE
Molybdenum-100
double-beta decay: (0neutrino)
n: shielding
numerical calculations: Monte Carlo
background

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