| Autor: |
Michel, Thilo, Gleixner, Thomas, Durst, Jürgen, Filipenko, Mykhaylo, Geißelsöder, Stefan |
| Předmět: |
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| Zdroj: |
Advances in High Energy Physics; 2013, p1-20, 20p |
| Abstrakt: |
We investigated the potential of the energy resolving hybrid pixel detector Timepix contacted to a CdTe sensor layer for the search for the neutrinoless double-beta decay of 116Cd. We found that a CdTe sensor layer with 3mm thickness and 165 μm pixel pitch is optimal with respect to the effective Majorana neutrino mass (mββ) sensitivity. In simulations, we were able to demonstrate a possible reduction of the background level caused by single electrons by approximately 75% at a specific background rate of 10-3 counts/(kg × keV × yr) at a detection efficiency reduction of about 23% with track analysis employing random decision forests. Exploitation of the imaging properties with track analysis leads to an improvement in sensitivity to mββ by about 22%. After 5 years of measuring time, the sensitivity to mββ of a 420 kg CdTe experiment (90% 116Cd enrichment) would be 59 meV on a 90% confidence level for a specific single-electron background rate of 10-3 counts/(kg × keV × yr). The α-particle background can be suppressed by at least about six orders of magnitude. The benefit of the hybrid pixel detector technology might be increased significantly if drift-time difference measurements would allow reconstruction of tracks in three dimensions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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