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cupid_pub:the_cupid_experiment [2021/05/22 20:23] benato [The Detector] |
cupid_pub:the_cupid_experiment [2021/06/04 08:31] (current) benato [The Experiment] |
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| |{{ cupid_pub:double_beta.png?330 }} |{{ cupid_pub:screenshot_20210522_144702.jpeg?330 }}| | |{{ cupid_pub:double_beta.png?330 }} |{{ cupid_pub:screenshot_20210522_144702.jpeg?330 }}| | ||
| - | |Decay scheme of 2νββ (top) and 0νββ decay (bottom). The two processes share the same parent and daughter nucleus, but differ for the number of emitted partiles, and consequently their energy.|The measurable sum electron spectrum is a continuum for 2νββ decay, and an excess at Q<sub>ββ</sub> for 0νββ decay.| | + | |Decay scheme of 2νββ (top) and 0νββ decay (bottom). The two processes share the same parent and daughter nucleus, but differ for the number of emitted particles, and consequently their energy.|The measurable sum electron spectrum is a continuum for 2νββ decay, and an excess at Q<sub>ββ</sub> for 0νββ decay.| |
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| Thus, CUPID will not only change the crystal, but also the candidate isotope. The reason for this choice is twofold: | Thus, CUPID will not only change the crystal, but also the candidate isotope. The reason for this choice is twofold: | ||
| on the one hand, Li<sub>2 </sub>MoO<sub>4</sub> is a scintillating material with a particle-dependent light yield, | on the one hand, Li<sub>2 </sub>MoO<sub>4</sub> is a scintillating material with a particle-dependent light yield, | ||
| - | on the other hand the candidate isotpe <sup>100</sup>Mo has a Q-value of 3034 keV | + | on the other hand the candidate isotope <sup>100</sup>Mo has a Q-value of 3034 keV |
| (compared to 2527 keV of <sup>130</sup>Te), which lies above most of the γ background from environmental radioactivity. Special attention is paid to the minimization of the radioactive contamination levels of all employed materials. Using the information from the predecessor experiments CUORE, [[https://cupid-0.lngs.infn.it/|CUPID-0]], and [[https://cupid-mo.mit.edu|CUPID-Mo]], the projected background at Q<sub>ββ</sub> is expected to be at the level of 10<sup>-4</sup> counts/keV/kg/yr. | (compared to 2527 keV of <sup>130</sup>Te), which lies above most of the γ background from environmental radioactivity. Special attention is paid to the minimization of the radioactive contamination levels of all employed materials. Using the information from the predecessor experiments CUORE, [[https://cupid-0.lngs.infn.it/|CUPID-0]], and [[https://cupid-mo.mit.edu|CUPID-Mo]], the projected background at Q<sub>ββ</sub> is expected to be at the level of 10<sup>-4</sup> counts/keV/kg/yr. | ||
| - | + | CUPID-Mo has robustly demonstrated that Li<sub>2</sub>MoO<sub>4</sub> scintillating bolometers | |
| + | meet the requirement for CUPID. CUPID-Mo was an array of 20 elements that took data until 2020 in the Modane underground laboratory in France, as a follow-up of the LUMINEU project. | ||
| + | It has shown the maturity reached by the proposed CUPID technology and the high standard of the Li<sub>2</sub>MoO<sub>4</sub> detectors in terms of energy resolution, α/β rejection capabilities, internal radiopurity, and overall reproducibility of the results. | ||
Last modified: le 2021/05/22 20:23
