Optimization of the first CUPID detector module

K. Alfonso (Virginia Polytechnic Institute and State University, Blacksburg, VA, USA; University of California, Los Angeles, CA, USA) ; A. Armatol (IRFU, CEA, Université Paris-Saclay, Saclay, France) ; C. Augier (Univ Lyon, Université Lyon 1, CNRS/IN2P3, IP2I-Lyon, Villeurbanne, 69622, France) ; F. Avignone (University of South Carolina, Columbia, SC, USA) ; O. Azzolini (INFN Laboratori Nazionali di Legnaro, Legnaro, Italy) ; et al. - Show all 177 authors

CUPID will be a next generation experiment searching for the neutrinoless double $$\beta $$ β decay, whose discovery would establish the Majorana nature of the neutrino. Based on the experience achieved with the CUORE experiment, presently taking data at LNGS, CUPID aims to reach a background free environment by means of scintillating Li $$_{2}$$ 2 $$^{100}$$ 100 MoO $$_4$$ 4 crystals coupled to light detectors. Indeed, the simultaneous heat and light detection allows us to reject the dominant background of $$\alpha $$ α particles, as proven by the CUPID-0 and CUPID-Mo demonstrators. In this work we present the results of the first test of the CUPID baseline module. In particular, we propose a new optimized detector structure and light sensors design to enhance the engineering and the light collection, respectively. We characterized the heat detectors, achieving an energy resolution of (5.9 ± 0.2) keV FWHM at the Q-value of $$^{100}$$ 100 Mo (about 3034 keV). We studied the light collection of the baseline CUPID design with respect to an alternative configuration which features gravity-assisted light detectors’ mounting. In both cases we obtained an improvement in the light collection with respect to past measures and we validated the particle identification capability of the detector, which ensures an $$\alpha $$ α particle rejection higher than 99.9%, fully satisfying the requirements for CUPID.

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          "value": "INFN Laboratori Nazionali del Gran Sasso, Assergi, AQ, Italy", 
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    {
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        {
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          "value": "Universit\u00e9 Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France", 
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    {
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        {
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          "value": "INFN Laboratori Nazionali del Gran Sasso, Assergi, AQ, Italy", 
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    {
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        {
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    {
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        {
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    {
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        {
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        {
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          "value": "INFN Laboratori Nazionali del Gran Sasso, Assergi, AQ, Italy", 
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    {
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        {
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          "value": "Universit\u00e9 Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France", 
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    {
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        {
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    {
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        {
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    {
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        {
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        {
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    {
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          "value": "INFN Laboratori Nazionali di Frascati, Frascati, Italy", 
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    {
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          "country": "Italy", 
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        {
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          "value": "Yale University, New Haven, CT, USA", 
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    {
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        {
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      ], 
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    {
      "categories": [
        "physics.ins-det", 
        "nucl-ex"
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      "value": "2202.06279"
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  "abstracts": [
    {
      "source": "Springer", 
      "value": "CUPID will be a next generation experiment searching for the neutrinoless double  $$\\beta $$  <math> <mi>\u03b2</mi> </math>   decay, whose discovery would establish the Majorana nature of the neutrino. Based on the experience achieved with the CUORE experiment, presently taking data at LNGS, CUPID aims to reach a background free environment by means of scintillating Li $$_{2}$$  <math> <msub> <mrow></mrow> <mn>2</mn> </msub> </math>    $$^{100}$$  <math> <msup> <mrow></mrow> <mn>100</mn> </msup> </math>  MoO $$_4$$  <math> <msub> <mrow></mrow> <mn>4</mn> </msub> </math>   crystals coupled to light detectors. Indeed, the simultaneous heat and light detection allows us to reject the dominant background of  $$\\alpha $$  <math> <mi>\u03b1</mi> </math>   particles, as proven by the CUPID-0 and CUPID-Mo demonstrators. In this work we present the results of the first test of the CUPID baseline module. In particular, we propose a new optimized detector structure and light sensors design to enhance the engineering and the light collection, respectively. We characterized the heat detectors, achieving an energy resolution of (5.9 \u00b1 0.2) keV FWHM at the Q-value of  $$^{100}$$  <math> <msup> <mrow></mrow> <mn>100</mn> </msup> </math>  Mo (about 3034 keV). We studied the light collection of the baseline CUPID design with respect to an alternative configuration which features gravity-assisted light detectors\u2019 mounting. In both cases we obtained an improvement in the light collection with respect to past measures and we validated the particle identification capability of the detector, which ensures an  $$\\alpha $$  <math> <mi>\u03b1</mi> </math>   particle rejection higher than 99.9%, fully satisfying the requirements for CUPID."
    }
  ], 
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Published on:
12 September 2022
Publisher:
Springer
Published in:
European Physical Journal C , Volume 82 (2022)
Issue 9
Pages 1-9
DOI:
https://doi.org/10.1140/epjc/s10052-022-10720-3
arXiv:
2202.06279
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

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