New limits on double-beta decay of Pt and Pt

F. A. Danevich; M. Hult; A. Junghans; D. V. Kasperovych; B. N. Kropivyansky; G. Lutter; G. Marissens; O. G. Polischuk; M. V. Romaniuk; H. Stroh; S. Tessalina; V. I. Tretyak; B. Ware

doi:10.1140/epjc/s10052-022-09989-1

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2022) 82: 29
https://doi.org/10.1140/epjc/s10052-022-09989-1

Regular Article - Experimental Physics

New limits on double-beta decay of $^{190}$ $^{190}$ Pt and $^{198}$ $^{198}$ Pt

F. A. Danevich¹^a, M. Hult², A. Junghans³, D. V. Kasperovych¹, B. N. Kropivyansky¹, G. Lutter⁴, G. Marissens², O. G. Polischuk¹, M. V. Romaniuk¹, H. Stroh², S. Tessalina⁵, V. I. Tretyak¹ and B. Ware⁵

¹ Institute for Nuclear Research of NASU, 03028, Kyiv, Ukraine
² European Commission, Joint Research Centre, Retieseweg 111, 2440, Geel, Belgium
³ Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328, Dresden, Germany
⁴ Department of Environmental Engineering, Technical University of Denmark, DTU Risø Campus, 4000, Roskilde, Denmark
⁵ John de Laeter Centre for Isotope Research, GPO Box U 1987, Curtin University, Bentley, WA, Australia

^a danevich@kinr.kiev.ua

Received: 2 September 2021
Accepted: 4 January 2022
Published online: 11 January 2022

Abstract

A search for double-beta decay of $^{190}$ $^{190}$ Pt and $^{198}$ $^{198}$ Pt with emission of $γ$ $\gamma$ -ray quanta was realized at the HADES underground laboratory with a 148 g platinum sample measured by two ultralow-background HPGe detectors over 8946 h. The isotopic composition of the platinum sample has been measured with high precision using inductively coupled plasma mass spectrometry. New lower limits for the half-lives of $^{190}$ $^{190}$ Pt relative to different channels and modes of the decays were set on the level of $lim T_{1 / 2} \sim 10^{14}$ $\lim T_{1/2}\sim 10^{14}$ – $10^{16}$ $10^{16}$ year. A possible exact resonant $0 ν K N$ $0\nu KN$ transition to the 1,2 1326.9 keV level of $^{190}$ $^{190}$ Os is limited for the first time as $T_{1 / 2} \geq 2.5 \times 10^{16}$ $T_{1/2} \ge 2.5 \times 10^{16}$ year. A new lower limit on the double-beta decay of $^{198}$ $^{198}$ Pt to the first excited level of $^{198}$ $^{198}$ Hg was set as $T_{1 / 2} \geq 3.2 \times 10^{19}$ $T_{1/2} \ge 3.2\times 10^{19}$ year, one order of magnitude higher than the limit obtained in the previous experiment.

© The Author(s) 2022

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