New search for double electron capture in 106Cd decay with the TGV-2 spectrometer

Briançon, Ch.; Brudanin, V.; Egorov, V.; Jose, J. M.; Klimenko, A.; Kovalı́k, A.; Rosov, S. V.; Rukhadze, E.; Rukhadze, N. I.; Salamatin, A. V.; Timkin, V.; Fajt, L.; Hodák, R.; Šimkovic, F.; Shitov, Yu.; Špavorová, M.; Štekl, I.; Yakushev, E.

doi:10.1134/s1063778815060058

Cited by 7 publications

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“…It is worth noting that the double electron capture is strongly suppressed respect to the other processes. Limits have been set for the neutrinoless double electron capture of 36 Ar by the GERDA experiment [49] and for various isotopes and processes from germanium gamma spectroscopy of different materials [50,51,52,53,54,55]. Typically, DBD occurs between ground states; as in even-even nuclei these states have spin and parity 0 + , the transition 0 + → 0 + is always possible, but transitions to low-lying excited states can also occur if they are kinematically allowed.…”

Section: The Double Beta Decay Processmentioning

confidence: 99%

Double beta decay experiments at Canfranc Underground Laboratory

Cebrián

2020

Progress in Particle and Nuclear Physics

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The first activities of the Canfranc Underground Laboratory ("Laboratorio Subterráneo de Canfanc", LSC) started in the mid-eighties in a railway tunnel located under the Spanish Pyrenees; since then, it has become an international multidisciplinary facility equipped with different services for underground science. The research activity at LSC is about Astroparticle Physics, dark matter searches and neutrino Physics; but also activities in Nuclear Astrophysics, Geophysics, and Biology are carried out. The investigation of the neutrinoless double beta decay has been one of the main research lines of LSC since the beginning. Many unknowns remain in the characterization of the basic neutrino properties and the study of this rare decay process requiring Physics beyond the Standard Model of Particle Physics can shed light on the lepton number conservation, the nature of the neutrinos as Dirac or Majorana particles and the absolute scale and ordering of the masses of the three generations. Here, the double beta decay searches performed at LSC for different emitters and following very different experimental approaches will be reviewed: from the very first experiments in the laboratory including the successful IGEX ("International Germanium EXperiment") for 76 Ge, which released very stringent limits to the effective neutrino mass at the time, to the present NEXT experiment ("Neutrino Experiment with a Xenon Time-Projection Chamber") for 136 Xe and future project CROSS ("Cryogenic Rare-event Observatory with Surface Sensitivity") for 130 Te and 100 Mo, both implementing innovative detector technologies to discriminate backgrounds. For the neutrinoless double beta decay channel and at 90% C.L., IGEX derived a limit to the half-life of 76 Ge of T 0ν 1/2 > 1.57 × 10 25 y while the corresponding expected limits are T 0ν 1/2 > 1.0 × 10 26 y for 136 Xe from NEXT-100 (for an exposure of 500 kg•y) and T 0ν 1/2 > 2.8×10 25 y for 100 Mo from CROSS (for 5 y and 4.7 kg of isotope). Activities related to double beta decays searches carried out in other underground laboratories have also been developed at LSC and will be presented too, like the operation of the BiPo-3 detector for radiopurity measurements of thin sheets with very high sensitivity. For each one of these experiments, the concept, the experimental setups and relevant results will be discussed.

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Section: The Double Beta Decay Processmentioning

confidence: 99%

Double beta decay experiments at Canfranc Underground Laboratory

Cebrián

2020

Progress in Particle and Nuclear Physics

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Experimental aspects of geoneutrino detection: Status and perspectives

Smirnov

2019

Progress in Particle and Nuclear Physics

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Neutrino geophysics, the study of the Earth's interior by measuring the fluxes of geologically produced neutrino at its surface, is a new interdisciplinary field of science, rapidly developing as a synergy between geology, geophysics and particle physics. Geoneutrinos, antineutrinos from longlived natural isotopes responsible for the radiogenic heat flux, provide valuable information for the chemical composition models of the Earth. The calculations of the expected geoneutrino signal are discussed, together with experimental aspects of geoneutrino detection, including the description of possible backgrounds and methods for their suppression. At present, only two detectors, Borexino and KamLAND, have reached sensitivity to the geoneutrino. The experiments accumulated a set of ∼190 geoneutrino events and continue the data acquisition. The detailed description of the experiments, their results on geoneutrino detection, and impact on geophysics are presented. The start of operation of other detectors sensitive to geoneutrinos is planned for the near future: the SNO+ detector is being filled with liquid scintillator, and the biggest ever 20 kt JUNO detector is under construction. A review of the physics potential of these experiments with respect to the geoneutrino studies, along with other proposals, is presented. New ideas and methods for geoneutrino detection are reviewed.

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