The Majorana Demonstrator: Progress towards showing the feasibility of a tonne_scale 76Ge neutrinoless double_beta decay experiment

18th International Symposium on Particles Strings and Cosmology

Finnerty, P.^1,2 ; Aguayo, E.^3 ; Amman, M.^4 ; Avignone, F.T.^5,6 ; Barabash, A.S.^7 ; Barton, P.J.^8 ; Beene, J.R.^6 ; Bertrand, F.E.^6 ; Boswell, M.^9 ; Brudanin, V.^10 ; Busch, M.^2,11 ; Chan, Y.-D.^8 ; Christofferson, C.D.^12 ; Collar, J.I.^13 ; Combs, D.C.^2,14 ; Cooper, R.J.^6 ; Detwiler, J.A.^8 ; Doe, P.J.^15 ; Efremenko, Yu^16 ; Egorov, V.^10 ; Ejiri, H.^17 ; Elliott, S.R.^9 ; Esterline, J.^2,11 ; Fast, J.E.^3 ; Fields, N.^13 ; Fraenkle, F.M.^12 ; Galindo-Uribarri, A.^6 ; Gehman, V.M.^9 ; Giovanetti, G.K.^12 ; Green, M.P.^1,2 ; Guiseppe, V.E.^18 ; Gusey, K.^10 ; Hallin, A.L.^19 ; Hazama, R.^17 ; Henning, R.^12 ; Hoppe, E.W.^3 ; Horton, M.^12 ; Howard, S.^12 ; Howe, M.A.^1,2 ; Johnson, R.A.^15 ; Keeter, K.J.^20 ; Kidd, M.F.^9 ; Knecht, A.^15 ; Kochetov, O.^10 ; Konovalov, S.I.^7 ; Kouzes, R.T.^3 ; Laferriere, B.D.^3 ; Leon, J.^15 ; Leviner, L.E.^2,14 ; Loach, J.C.^8 ; Luke, P.N.^4 ; Macmullin, S.^1,2 ; Marino, M.G.^15 ; Martin, R.D.^8 ; Merriman, J.H.^3 ; Miller, M.L.^15 ; Mizouni, L.^3,5 ; Nomachi, M.^17 ; Orrell, J.L.^3 ; Overman, N.R.^3 ; Perumpilly, G.^18 ; Phillips, D.G.^2,14 ; Poon, A.W.P.^8 ; Radford, D.C.^6 ; Rielage, K.^9 ; Robertson, R.G.H.^15 ; Ronquest, M.C.^9 ; Schubert, A.G.^15 ; Shima, T.^17 ; Shirchenko, M.^10 ; Snavely, K.J.^1,2 ; Steele, D.^9 ; Strain, J.^1,2 ; Timkin, V.^10 ; Tornow, W.^2,11 ; Varner, R.L.^6 ; Vetter, K.^8,21 ; Vorren, K.^12 ; Wilkerson, J.F.^1,2,6 ; Yakushev, E.^10 ; Yaver, H.^4 ; Young, A.R.^2,14 ; Yu, C.-H.^6 ; Yumatov, V.^7

Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC, United States^1

Triangle Universities Nuclear Laboratory, Durham, NC, United States^2

Pacific Northwest National Laboratory, Richland, WA, United States^3

Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States^4

Department of Physics and Astronomy, University of South Carolina, Columbia, SC, United States^5

Oak Ridge National Laboratory, Oak Ridge, TN, United States^6

Institute for Theoretical and Experimental Physics, Moscow, Russia^7

Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States^8

Los Alamos National Laboratory, Los Alamos, NM, United States

(10) Joint Institute for Nuclear Research, Dubna, Russia

(11) Department of Physics, Duke University, Durham, NC, United States

(12) South Dakota School of Mines and Technology, Rapid City, SD, United States

(13) Department of Physics, University of Chicago, Chicago, IL, United States

(14) Department of Physics, North Carolina State University, Raleigh, NC, United States

(15) Center for Experimental Nuclear Physics and Astrophysics, Department of Physics, University of Washington, Seattle, WA, United States

(16) Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, United States

(17) Research Center for Nuclear Physics, Department of Physics, Osaka University, Ibaraki Osaka, Japan

(18) Department of Physics, University of South Dakota, Vermillion, SD, United States

(19) Centre for Particle Physics, University of Alberta, Edmonton AB, Canada

(20) Department of Physics, Black Hills State University, Spearfish, SD, United States

(21) Department of Nuclear Engineering, University of California, Berkeley, CA, United States^9

关键词: Active shielding;    Direct search;    Double beta decay;    Germanium detector;    Low background;    Neutrinoless double-beta decays;    Region of interest;    Research facilities;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/485/1/012042/pdf
DOI  :  10.1088/1742-6596/485/1/012042

来源: IOP

【 摘 要 】

The Majorana Demonstrator will search for the neutrinoless double-beta decay (0vββ) of the76Ge isotope with a mixed array of enriched and natural germanium detectors. The observation of this rare decay would indicate the neutrino is its own anti-particle, demonstrate that lepton number is not conserved, and provide information on the absolute mass-scale of the neutrino. The Demonstrator is being assembled at the 4850 foot level of the Sanford Underground Research Facility in Lead, South Dakota. The array will be contained in a low-background environment and surrounded by passive and active shielding. The goals for the Demonstrator are: demonstrating a background rate less than 3 t-1y-1in the 4 keV region of interest (ROI) surrounding the 2039 keV76Ge endpoint energy; establishing the technology required to build a tonne-scale germanium based double-beta decay experiment; testing the recent claim of observation of 0vββ [1]; and performing a direct search for light WIMPs (3-10 GeV/c2).