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20 April 2024

» arxiv » 1109.4154

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Depth Requirements for a Tonne-scale 76Ge Neutrinoless Double-beta Decay Experiment
MAJORANA Collaboration ; E. Aguayo ; F. T. Avignone III ; H. O. Back ; A. S. Barabash ; M. Bergevin ; F. E. Bertrand ; M. Boswell ; V. Brudanin ; M. Busch ; Y-D. Chan ; C. D. Christofferson ; J. I. Collar ; D. C. Combs ; R. J. Cooper ; J. A. Detwiler ; P. J. Doe ; Yu. Efremenko ; V. Egorov ; H. Ejiri ; S. R. Elliott ; J. Esterline ; J. E. Fast ; N. Fields ; P. Finnerty ; F. M. Fraenkle ; V. M. Gehman ; G. K. Giovanetti ; M. P. Green ; V. E. Guiseppe ; K. Gusey ; A. L. Hallin ; R. Hazama ; R. Henning ; A. Hime ; E. W. Hoppe ; M. Horton ; S. Howard ; M. A. Howe ; R. A. Johnson ; K. J. Keeter ; M. E. Keillor ; C. Keller ; J. D. Kephart ; M. F. Kidd ; A. Knecht ; O. Kochetov ; S. I. Konovalov ; R. T. Kouzes ; B. D. LaFerriere ; B. H. LaRoque ; J. Leon ; L. E. Leviner ; J. C. Loach ; S. MacMullin ; M. G. Marino ; R. D. Martin ; D. -M. Mei ; J. H. Merriman ; M. L. Miller ; L. Mizouni ; M. Nomachi ; J. L. Orrell ; N. R. Overman ; D. G. Phillips II ; A. W. P. Poon ; G. Perumpilly ; G. Prior ; D. C. Radford ; K. Rielage ; R. G. H. Robertson ; M. C. Ronquest ; A. G. Schubert ; T. Shima ; M. Shirchenko ; K. J. Snavely ; V. Sobolev ; D. Steele ; J. Strain ; K. Thomas ; V. Timkin ; W. Tornow ; I. Vanyushin ; R. L. Varner ; K. Vetter ; K. Vorren ; J. F. Wilkerson ; B. A. Wolfe ; E. Yakushev ; A. R. Young ; C. -H. Yu ; V. Yumatov ; C. Zhang ;
Date:	19 Sep 2011
Abstract:	Neutrinoless double-beta decay experiments can potentially determine the Majorana or Dirac nature of the neutrino, and aid in understanding the neutrino absolute mass scale and hierarchy. Future 76Ge-based searches target a half-life sensitivity of >10^27 y to explore the inverted neutrino mass hierarchy. Reaching this sensitivity will require a background rate of <1 count tonne^-1 y^-1 in a 4-keV-wide spectral region of interest surrounding the Q value of the decay. We investigate the overburden required to reach this background goal in a tonne-scale experiment with a compact (copper and lead) shield based on Monte Carlo calculations of cosmic-ray background rates. We find that, in light of the presently large uncertainties in these types of calculations, a site with an underground depth >~5200 meters water equivalent is required for a tonne-scale experiment with a compact shield similar to the planned 40-kg MAJORANA DEMONSTRATOR. The required overburden is highly dependent on the chosen shielding configuration and could be relaxed significantly if, for example, a liquid cryogen and water shield, or an active neutron shield were employed. Operation of the MAJORANA DEMONSTRATOR and GERDA detectors will serve to reduce the uncertainties on cosmic-ray background rates and will impact the choice of shielding style and location for a future tonne-scale experiment.
Source:	arXiv, 1109.4154
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