Preprint

First observation of single beta decay of $^{96}$Zr

A. S. BarabashNational Research Centre "Kurchatov Institute" , Moscow , 123182 , RussiaS. EvseevLaboratory of Nuclear Problems , Joint Institute for Nuclear Research , 6 Joliot-Curie , Dubna , 141980 , RussiaD. FilosofovLaboratory of Nuclear Problems , Joint Institute for Nuclear Research , 6 Joliot-Curie , Dubna , 141980 , RussiaYu. M. GavrilyukA. M. GangapshevInstitute for Nuclear Research of the Russian Academy of Sciences , 7a Prospect 60-letiya Oktyabrya , Moscow , 117312 , RussiaN. GorshkovLaboratory of Nuclear Problems , Joint Institute for Nuclear Research , 6 Joliot-Curie , Dubna , 141980 , RussiaV. KazalovS. KazartsevLaboratory of Nuclear Problems , Joint Institute for Nuclear Research , 6 Joliot-Curie , Dubna , 141980 , RussiaT. KhussainovLaboratory of Nuclear Problems , Joint Institute for Nuclear Research , 6 Joliot-Curie , Dubna , 141980 , RussiaV. V. KuzminovInstitute for Nuclear Research of the Russian Academy of Sciences , 7a Prospect 60-letiya Oktyabrya , Moscow , 117312 , RussiaA. LubashevskiyDmitry PonomarevS RozovLaboratory of Nuclear Problems , Joint Institute for Nuclear Research , 6 Joliot-Curie , Dubna , 141980 , RussiaN. TemerbulatovaInstitute of Nuclear Physics of theS. VasilyevE. A. YakushevLaboratory of Nuclear Problems , Joint Institute for Nuclear Research , 6 Joliot-Curie , Dubna , 141980 , RussiaV. I. UmatovNational Research Centre "Kurchatov Institute" , Moscow , 123182 , Russia

2026

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Annotatsiya

The single beta decay of $^{96}$Zr has been detected for the first time using a 211 cm$^3$ low-background HPGe detector and an external source consisting of two samples of enriched zirconium (atomic fraction of $^{96}$Zr is 88.28%, total mass is 140.65 g). During the search for the $β$ decay of $^{96}$Zr, the $β$ decay of the daughter nucleus $^{96}$Nb to the excited states of $^{96}$Mo has been observed. The $γ$-ray cascade produced by the $^{96}$Mo nucleus while de-exciting to the ground state has been detected with the HPGe detector. The experiment has been carried out at the Baksan Neutrino Observatory. It has produced 12625.34 h of data. The half-life of the single beta decay of $^{96}$Zr is measured to be $T_{1/2} = [2.27^{+0.53}_{-0.36}(stat) \pm 0.27(syst)]\times10^{20}$ yr.

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DOI: 10.48550/arxiv.2605.18344

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