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Abstract: Building on the successful experience in operating the DarkSide-50 detector,the DarkSide Collaboration is going to construct DarkSide-20k, a direct WIMPsearch detector using a two-phase Liquid Argon Time Projection Chamber (LArTPC)with an active (fiducial) mass of 23 t (20 t). The DarkSide-20k LArTPC will bedeployed within a shield/veto with a spherical Liquid Scintillator Veto (LSV)inside a cylindrical Water Cherenkov Veto (WCV). Operation of DarkSide-50demonstrated a major reduction in the dominant $^{39}$Ar background when usingargon extracted from an underground source, before applying pulse shapeanalysis. Data from DarkSide-50, in combination with MC simulation andanalytical modeling, shows that a rejection factor for discrimination betweenelectron and nuclear recoils of $gt3times10^9$ is achievable. This, alongwith the use of the veto system, is the key to unlocking the path to largeLArTPC detector masses, while maintaining an 'instrumental background-free'experiment, an experiment in which less than 0.1 events (other than$nu$-induced nuclear recoils) is expected to occur within the WIMP searchregion during the planned exposure. DarkSide-20k will have ultra-lowbackgrounds than can be measured in situ. This will give sensitivity toWIMP-nucleon cross sections of $1.2times10^{-47}$ cm$^2$ ($1.1times10^{-46}$cm$^2$) for WIMPs of $1$ TeV$/c^2$ ($10$ TeV$/c^2$) mass, to be achieved duringa 5 yr run producing an exposure of 100 t yr free from any instrumentalbackground. DarkSide-20k could then extend its operation to a decade,increasing the exposure to 200 t yr, reaching a sensitivity of$7.4times10^{-48}$ cm$^2$ ($6.9times10^{-47}$ cm$^2$) for WIMPs of $1$TeV$/c^2$ ($10$ TeV$/c^2$) mass.

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From: Andrew Renshaw PhD [view email]

In this content, we’re going to talk about free Visa Credit Card Generator tool & the process to use it. Visa Credit Card Generator. Nowadays, it has become effortless and convenient to generate Visa Credit Card numbers entirely using fake details which include fake name, house address, phone number, expiry date and security details like the 3- digit security code which is also known as CVV.
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[v1]Tue, 25 Jul 2017 18:31:41 UTC (15,911 KB)
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