Phonon-mediated crystal detectors with metallic film coating capable of rejecting α and β events induced by surface radioactivity

被引：11

作者：

Bandac, I. C. ^{[1
]}

Barabash, A. S. ^{[2
]}

Berge, L. ^{[3
]}

Bourgeois, Ch. ^{[3
]}

Calvo-Mozota, J. M. ^{[1
]}

Carniti, P. ^{[4
]}

Chapellier, M. ^{[3
]}

deCombarieu, M. ^{[5
]}

Dafinei, I. ^{[6
]}

Danevich, F. A. ^{[7
]}

Dumoulin, L. ^{[3
]}

Ferri, F. ^{[5
]}

Giuliani, A. ^{[3
]}

Gotti, C. ^{[4
]}

Gras, Ph. ^{[5
]}

Guerard, E. ^{[3
]}

Ianni, A. ^{[8
]}

Khalife, H. ^{[3
]}

Konovalov, S. I. ^{[2
]}

Loaiza, P. ^{[3
]}

Madhukuttan, M. ^{[3
]}

deMarcillac, P. ^{[3
]}

Mariam, R. ^{[3
]}

Marnieros, S. ^{[3
]}

Marrache-Kikuchi, C. A. ^{[3
]}

Martinez, M. ^{[9
,10
]}

Nones, C. ^{[5
]}

Olivieri, E. ^{[3
]}

Pessina, G. ^{[4
]}

Poda, D. V. ^{[3
]}

Redon, Th. ^{[3
]}

Scarpaci, J. -A. ^{[3
]}

Tretyak, V. I. ^{[7
]}

Umatov, V. I. ^{[2
]}

Zarytskyy, M. M. ^{[7
]}

Zolotarova, A. S. ^{[3
]}

机构：

[1] Lab Subterraneo Canfranc, Canfranc Estacion 22880, Spain

[2] Natl Res Ctr, Kurchatov Inst, Inst Theoret & Expt Phys, Moscow 117218, Russia

[3] Univ Paris Saclay, CNRS, IN2P3, IJCLab, F-91405 Orsay, France

[4] INFN, Sez Milano Bicocca, I-20126 Milan, Italy

[5] Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France

[6] INFN, Sez Roma, I-00185 Rome, Italy

[7] NASU, Inst Nucl Res, UA-03028 Kiev, Ukraine

[8] INFN, Lab Nazl Gran Sasso, I-67100 Assergi, AQ, Italy

[9] Univ Zaragoza, Fdn ARAID, Zaragoza 50009, Spain

[10] Univ Zaragoza, Ctr Astroparticulas & Fis Altas Energias, Zaragoza 50009, Spain

来源：

APPLIED PHYSICS LETTERS | 2021年 / 118卷 / 18期

基金：

欧洲研究理事会; 新加坡国家研究基金会;

关键词：

LOW-TEMPERATURE DETECTORS; QUASI-PARTICLE; DECAY; PERFORMANCE; BOLOMETERS; LI2MOO4; SEARCH;

D O I：

10.1063/5.0050124

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Phonon-mediated particle detectors based on single crystals and operated at millikelvin temperatures are used in rare-event experiments for neutrino physics and dark-matter searches. In general, these devices are not sensitive to the particle impact point, especially if the detection is mediated by thermal phonons. In this Letter, we demonstrate that excellent discrimination between interior and surface beta and alpha events can be achieved by coating a crystal face with a thin metallic film, either continuous or in the form of a grid. The coating affects the phonon energy downconversion cascade that follows the particle interaction, leading to a modified signal shape for close-to-film events. An efficient identification of surface events was demonstrated with detectors based on a rectangular 20 x 20 x 10 mm(3) Li2MoO4 crystal coated with a Pd normal-metal film (10nm thick) and with Al-Pd superconductive bi-layers (100nm-10nm thick) on a 20x20mm(2) face. Discrimination capabilities were tested with U-238 sources emitting both alpha and beta particles. Surface events are identified for energy depositions down to millimeter-scale depths from the coated surface. With this technology, a substantial reduction of the background level can be achieved in experiments searching for neutrinoless double-beta decay.

引用

页数：6

共 1 条

[1] Phonon-mediated decay of an atom in a surface-induced potential
Le Kien, Fam
Gupta, S. Dutta
Hakuta, K.
PHYSICAL REVIEW A, 2007, 75 (06):

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