Complete event-by-event alpha/gamma (beta) separation in a full-size TeO2 CUORE bolometer by Neganov-Luke-magnified light detection

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A90072%2F18%3A00344164" target="_blank" >RIV/68407700:90072/18:00344164 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevC.97.032501" target="_blank" >https://doi.org/10.1103/PhysRevC.97.032501</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevC.97.032501" target="_blank" >10.1103/PhysRevC.97.032501</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Complete event-by-event alpha/gamma (beta) separation in a full-size TeO2 CUORE bolometer by Neganov-Luke-magnified light detection

Popis výsledku v původním jazyce

In the present work, we describe the results obtained with a large (approximate to 133 cm(3)) TeO2 bolometer, with a view to a search for neutrinoless double-beta decay (0 nu beta beta) of Te-130. We demonstrate an efficient alpha-particle discrimination (99.9%) with a high acceptance of the 0 nu beta beta signal (about 96%), expected at approximate to 2.5 MeV. This unprecedented result was possible thanks to the superior performance (10-eV rms baseline noise) of a Neganov-Luke-assisted germanium bolometer used to detect a tiny (70-eV) light signal from the TeO2 detector, dominated by gamma(beta)-induced Cherenkov radiation but exhibiting also a clear scintillation component. The obtained results represent a major breakthrough toward the TeO2-based version of the CUORE Upgrade with Particle IDentification (CUPID), a ton-scale cryogenic 0 nu beta beta experiment proposed as a followup to the Cryogenic Underground Observatory for Rare Events (CUORE) project with particle identification. The CUORE experiment recently began a search for neutrinoless double-beta decay of Te-130 with an array of 988 125-cm(3) TeO2 bolometers. The lack of alpha discrimination in CUORE makes alpha decays at the detector surface the dominant background component, at the level of approximate to 0.01 counts/(keV kg y) in the region of interest. We show here, for the first time with a CUORE-size bolometer and using the same technology as CUORE for the readout of both heat and light signals, that surface alpha background can be fully rejected.

Název v anglickém jazyce

Complete event-by-event alpha/gamma (beta) separation in a full-size TeO2 CUORE bolometer by Neganov-Luke-magnified light detection

Popis výsledku anglicky

In the present work, we describe the results obtained with a large (approximate to 133 cm(3)) TeO2 bolometer, with a view to a search for neutrinoless double-beta decay (0 nu beta beta) of Te-130. We demonstrate an efficient alpha-particle discrimination (99.9%) with a high acceptance of the 0 nu beta beta signal (about 96%), expected at approximate to 2.5 MeV. This unprecedented result was possible thanks to the superior performance (10-eV rms baseline noise) of a Neganov-Luke-assisted germanium bolometer used to detect a tiny (70-eV) light signal from the TeO2 detector, dominated by gamma(beta)-induced Cherenkov radiation but exhibiting also a clear scintillation component. The obtained results represent a major breakthrough toward the TeO2-based version of the CUORE Upgrade with Particle IDentification (CUPID), a ton-scale cryogenic 0 nu beta beta experiment proposed as a followup to the Cryogenic Underground Observatory for Rare Events (CUORE) project with particle identification. The CUORE experiment recently began a search for neutrinoless double-beta decay of Te-130 with an array of 988 125-cm(3) TeO2 bolometers. The lack of alpha discrimination in CUORE makes alpha decays at the detector surface the dominant background component, at the level of approximate to 0.01 counts/(keV kg y) in the region of interest. We show here, for the first time with a CUORE-size bolometer and using the same technology as CUORE for the readout of both heat and light signals, that surface alpha background can be fully rejected.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10304 - Nuclear physics

Projekt

—

Návaznosti

—

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

PHYSICAL REVIEW C

ISSN

2469-9985

e-ISSN

2469-9993

Svazek periodika

97

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

0-4

Kód UT WoS článku

000427113500001

EID výsledku v databázi Scopus

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