Lowering the Energy Threshold of the CUORE Experiment: Benefits in the Surface Alpha Events Reconstruction
- PDF / 1,598,567 Bytes
- 10 Pages / 439.37 x 666.142 pts Page_size
- 107 Downloads / 178 Views
Lowering the Energy Threshold of the CUORE Experiment: Benefits in the Surface Alpha Events Reconstruction Comparison Between Optimum Trigger and Derivative Trigger Performance in the Search for 0ˇˇ Alice Campani, et al. [full author details at the end of the article] Received: 8 October 2019 / Accepted: 25 May 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract CUORE is a tonne-scale cryogenic experiment located at the Laboratori Nazionali del Gran Sasso that exploits bolometric technique to search for neutrinoless double beta decay of 130 Te . Thanks to its very low background and large mass, CUORE is also a powerful tool to study a broad class of phenomena, such as solar axions and WIMP scattering. The ability to conduct such sensitive searches crucially depends on the energy threshold, which has to be kept as low as possible. In this contribution, we show how the trigger algorithm affects the sensitivity to low-energy phenomena and the interpretation of the energy spectrum. In particular, we focus on the impact that the trigger algorithm has on the identification of the coincidence events among different crystals and, consequently, on the reconstruction of the background. Keywords Neutrinoless double beta decay · Trigger algorithms · Digital signal processing · Bolometers for dark matter research
1 CUORE Experiment Neutrinoless double beta decay ( 0𝜈𝛽𝛽 [1]) is a rare, second-order nuclear transition in which an initial nucleus (A, Z) decays to a member (A, Z + 2) of the same isobaric multiplet with the simultaneous emission of two electrons. In the attempt to investigate the nature of the 0𝜈𝛽𝛽 various theoretical possibilities were considered; however, the general interest has remained focused on the neutrino mass mechanism. 0𝜈𝛽𝛽 is forbidden by the Standard Model and explicitly violates the lepton number by two units. Its observation would thus prove that the lepton number is not a conserved quantity, and it would also provide us with precious information on the neutrino mass nature and scale. The experimental signature of 0𝜈𝛽𝛽 is a S. J. Freedman: Deceased.
13
Vol.:(0123456789)
Journal of Low Temperature Physics
monoenergetic peak at the Q-value of the decay, considering the summed energy spectrum of the two emitted electrons. The candidate isotopes that could undergo 0𝜈𝛽𝛽 are even–even nuclei for which single beta decay is energetically forbidden. The Cryogenic Underground Observatory for Rare Events (CUORE) is an experiment located at the LNGS, Italy, searching for the 0𝜈𝛽𝛽 of 130Te. This isotope has the highest natural isotopic abundance (34.2% [2]) among the nuclei of interest. CUORE exploits the bolometric technique to get a high resolution around the 0𝜈𝛽𝛽 Q-value ( ∼ 2527.5 keV [3]). The detector consists of an array of 988 naturalTeO2 cubic crystals [4], for a total active mass of 742 kg ( ∼ 206 kg of 130Te). A bolometer is a sensitive calorimeter that measures the energy deposited by a particle interaction via increase in the temperature of the absorber. E
Data Loading...
