The Majorana Demonstrator: Progress towards showing the feasibility of a tonne–scale<sup>76</sup>Ge neutrinoless double–beta decay experiment

Finnerty, P.; Aguayo, E.; Amman, M.; Avignone, F. T.; Barabash, A. S.; Barton, Paul; Beene, J. R.; Bertrand, F.; Boswell, M.; Brudanin, V.; Busch, M.; Christofferson, C. D.; Collar, J. I.; Combs, D. C.; Cooper, R.; Detwiler, J. A.; Doe, P. J.; Efremenko, Y. V.; Egorov, V.; Ejiri, H.; Elliott, S. R.; Esterline, J.; Fast, J. E.; Fields, N.; Fraenkle, F. M.; Galindo‐Uribarri, A.; Gehman, V. M.; Giovanetti, G. K.; Green, M P; Guiseppe, V. E.; Gusey, K.; Hallin, A. L.; Hazama, R.; Henning, R.; Hoppe, E. W.; Horton, Mark; Howard, S.; Howe, M. A.; Johnson, Rob; Keeter, K. J.; Kidd, M. F.; Knecht, A.; Kochetov, O.; Коновалов, С. И.; Kouzes, Richard T.; LaFerriere, B. D.; Leon, J.; Leviner, L. E.; Loach, J. C.; Luke, P.N.; MacMullin, S.; Marino, M. G.; Martin, R. D.; Merriman, J. H.; Miller, Michael L.; Mizouni, L.; Nomachi, M.; Orrell, J. L.; Overman, Nicole; Perumpilly, G.; Phillips, D. G.; Poon, A. W. P.; Radford, D. C.; Rielage, K.; Robertson, R. G. H.; Ronquest, M.; Schubert, A.; Shima, T.; Shirchenko, M.; Snavely, K. J.; Steele, D.; Strain, J.; Timkin, V.; Tornow, W.; Varner, R. L.; Vetter, K.; Vorren, K.; Wilkerson, J. F.; Yakushev, E.; Yaver, H.; Young, A. R.; Yu, C. H.; Yumatov, V.

doi:10.1088/1742-6596/485/1/012042

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…The Gerda [11] experiment in Europe and Majorana [12,13] in the USA, at different stages of development and using different experimental approaches, are the current state-of-the-art experiments to search for 0] in 76 Ge using germanium detectors. The process has a clear signature with a monoenergetic line in the observed energy spectrum at = 2039.061±0.007 keV [14], corresponding to the sum of the two electrons energies.…”

Section: Introductionmentioning

confidence: 99%

Status of the GERDA Experiment at the Laboratori Nazionali del Gran Sasso

Brugnera

Garfagnini

2013

Advances in High Energy Physics

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The Germanium Detector Array (Gerda) is a low background experiment at the Laboratori Nazionali del Gran Sasso (LNGS) of the INFN designed to search for the rare neutrinoless double beta decay (0νββ) of76Ge. In its first phase, high purity germanium diodes inherited from the former Heidelberg-Moscow and Igexexperiments are operated “bare” and immersed in liquid argon, with an overall background environment of 10−2 cts/(keV·kg·yr), a factor of ten better than its predecessors. Measurements on two-neutrino double beta decay (2νββ) givingT1/22ν=(1.88±0.10)×1021 yrand recently published background model and pulse shape performances of the detectors are discussed in the paper. A new result on0νββhas been recently published with a half-life limit on0νββdecayT1/20ν>2.1×1025 yr(90% C.L.). A second phase of the experiment is scheduled to start during the year 2014, after a major upgrade shutdown. Thanks to the increased detector mass with new designed diodes and to the introduction of liquid argon instrumentation techniques, the experiment aims to reduce further the expected background to about 10−3 cts/(keV·kg·yr) and to improve the0νββsensitivity to aboutT1/20ν>1.5×1026 yr(90% C.L.).

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Section: Introductionmentioning

confidence: 99%

Status of the GERDA Experiment at the Laboratori Nazionali del Gran Sasso

Brugnera

Garfagnini

2013

Advances in High Energy Physics

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“…CoGeNT employs germanium detectors to explore light-mass dark matter and as recently as 2011 has shown an energy threshold of 500 eV [2]. The MAJORANA DEMONSTRATOR will use an array of germanium detectors along with similar and improved technologies in order to perform a light WIMP search as well [3].…”

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confidence: 99%

Noise considerations for a very low threshold semiconductor detector system

Leon

Knecht

Miller³

et al. 2012

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)

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The search for dark matter motivates develo p ment of a semiconductor detector system with a very low noise threshold. The CoGeNT and MAJORANA p rojects both make use of hy p er-p ure Ge detectors and are in p rinci p le sensitive to the ionization signals p roduced by dark matter p articles scattering from Ge nuclei if sub-keV thresholds can be achieved.We describe p rogress toward mitigating noise on several fronts: the lIf noise that is inherent in ca p acitors and may also be p resent in the de p letion layer of pn junctions, and the aliasing noise that is endemic with FFTs taken digitally over a large frequency range.An o p erating front-end design with an ENC (equivalent noise charge) of 4.5 electrons RMS has been demonstrated.

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