The production of ultra-pure raw material is a crucial step to ensure the required background level in rare event searches. In this work, we establish an innovative technique developed to produce high-purity (99.999%) granular zinc. We demonstrate the effectiveness of the refining procedure by measuring the internal contaminations of the purified zinc with a high-purity germanium detector at the Laboratori Nazionali del Gran Sasso. The total activity of cosmogenic activated nuclides is measured at the level of a few mBq/kg, as well as limits on naturally occurring radionuclides are set to less than mBq/kg. The excellent radiopurity of the zinc sample allows us to search for electron capture with positron emission and neutrinoless double electron capture of Zn-64, setting the currently most stringent lower limits on their half-lives, T-1/2(epsilon beta+) >2.7 x 10(21) year (90% CI), and T-1/2(0 nu 2 epsilon) >2.6 x 10(21) year (90% CI), respectively.

Bellini, F., Beretta, M., Cardani, L., Carniti, P., Casali, N., Celi, E., et al. (2021). Search for double beta-decay modes of Zn-64 using purified zinc. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 81(2) [10.1140/epjc/s10052-021-08918-y].

Search for double beta-decay modes of Zn-64 using purified zinc

Carniti, P;Chiesa, D;Clemenza, M;Gironi, L;Gotti, C;Pattavina, L;Pessina, G;Previtali, E;
2021

Abstract

The production of ultra-pure raw material is a crucial step to ensure the required background level in rare event searches. In this work, we establish an innovative technique developed to produce high-purity (99.999%) granular zinc. We demonstrate the effectiveness of the refining procedure by measuring the internal contaminations of the purified zinc with a high-purity germanium detector at the Laboratori Nazionali del Gran Sasso. The total activity of cosmogenic activated nuclides is measured at the level of a few mBq/kg, as well as limits on naturally occurring radionuclides are set to less than mBq/kg. The excellent radiopurity of the zinc sample allows us to search for electron capture with positron emission and neutrinoless double electron capture of Zn-64, setting the currently most stringent lower limits on their half-lives, T-1/2(epsilon beta+) >2.7 x 10(21) year (90% CI), and T-1/2(0 nu 2 epsilon) >2.6 x 10(21) year (90% CI), respectively.
Articolo in rivista - Articolo scientifico
double beta decay, radioactivity
English
2021
81
2
106
open
Bellini, F., Beretta, M., Cardani, L., Carniti, P., Casali, N., Celi, E., et al. (2021). Search for double beta-decay modes of Zn-64 using purified zinc. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 81(2) [10.1140/epjc/s10052-021-08918-y].
File in questo prodotto:
File Dimensione Formato  
10281-401021_VoR.pdf

accesso aperto

Tipologia di allegato: Publisher’s Version (Version of Record, VoR)
Licenza: Creative Commons
Dimensione 479.49 kB
Formato Adobe PDF
479.49 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/401021
Citazioni
  • Scopus 5
  • ???jsp.display-item.citation.isi??? 3
Social impact