The Majorana Parts Tracking Database

Abgrall, N.; Aguayo, E.; Avignone, F. T.; Barabash, A. S.; Bertrand, F. E.; Brudanin, V.; Busch, M.; Byram, D.; Caldwell, A.; Christofferson, C. D.; Combs, D. C.; Cuesta, C.; Detwiler, J. A.; Doe, P. J.; Efremenko, Yu.; Egorov, V.; Ejiri, H.; Elliott, S. R.; Esterline, J.; Fast, J. E.; Finnerty, P.; Fraenkle, F. M.; Galindo-Uribarri, A.; Giovanetti, G. K.; Goett, J.; Green, M. P.; Gruszko, J.; Guiseppe, V. E.; Gusev, K.; Hallin, A. L.; Hazama, R.; Hegai, A.; Henning, R.; Hoppe, E. W.; Howard, S.; Howe, M. A.; Keeter, K. J.; Kidd, M. F.; Kochetov, O.; Коновалов, С. И.; Kouzes, Richard T.; LaFerriere, B. D.; Leon, J.; Leviner, L. E.; Loach, J. C.; MacMullin, J.; Martin, R. D.; Meijer, S. J.; Mertens, S.; Miller, Michael L.; Mizouni, L.; Nomachi, M.; Orrell, J. L.; O’Shaughnessy, C.; Overman, Nicole; Petersburg, R.; Phillips, D. G.; Poon, A. W. P.; Pushkin, K.; Radford, D. C.; Rager, J.; Rielage, K.; Robertson, R. G. H.; Romero-Romero, E.; Ronquest, M.; Shanks, B.; Shima, T.; Shirchenko, M.; Snavely, K. J.; Snyder, N.; Soin, A.; Suriano, A. M.; Tedeschi, D. J.; Thompson, J.; Timkin, V.; Tornow, W.; Trimble, J. E.; Varner, R. L.; Vasilyev, S.; Vetter, K.; Vorren, K.; White, B. R.; Wilkerson, J. F.; Wiseman, C.; Xu, W.; Yakushev, E.; Young, A. R.; Yu, C.‐H.; Yumatov, V.; Zhitnikov, I.

doi:10.1016/j.nima.2015.01.001

Cited by 16 publications

(12 citation statements)

References 15 publications

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“…The parts tracking database used to monitor cosmogenic exposure and inventory is described in [30]. Each module is equipped with a system to deploy a 228 Th line source into the shield for periodic (∼weekly) calibrations.…”

Section: Introductionmentioning

confidence: 99%

Search for neutrinoless double- β decay in Ge76 with 26 kg yr of exposure from the Majorana Demonstrator

Alvis¹,

Arnquist²,

Avignone³

et al. 2019

Phys. Rev. C

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133

129

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The Majorana Collaboration is operating an array of high purity Ge detectors to search for the neutrinoless double-beta decay of 76 Ge. The Majorana Demonstrator consists of 44.1 kg of Ge detectors (29.7 kg enriched to 88% in 76 Ge) split between two modules constructed from ultra-clean materials. Both modules are contained in a low-background shield at the Sanford Underground Research Facility in Lead, South Dakota. We present updated results on the search for neutrinoless double-beta decay in 76 Ge with 26.0 ± 0.5 kg-yr of enriched exposure. With the Demonstrator's unprecedented energy resolution of 2.53 keV FWHM at Q ββ , we observe one event in the region of interest with 0.65 events expected from the estimated background, resulting in a lower limit on the 76 Ge neutrinoless double-beta decay half-life of 2.7 × 10 25 yr (90% CL) with a median sensitivity of 4.8 × 10 25 yr (90% CL). Depending on the matrix elements used, a 90% CL upper limit on the effective Majorana neutrino mass in the range of 200-433 meV is obtained. The measured background in the low-background configurations is 11.9 ± 2.0 counts/(FWHM t yr).

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Section: Introductionmentioning

confidence: 99%

Search for neutrinoless double- β decay in Ge76 with 26 kg yr of exposure from the Majorana Demonstrator

Alvis¹,

Arnquist²,

Avignone³

et al. 2019

Phys. Rev. C

Self Cite

133

129

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show abstract

“…In addition, a zone-refining facility was established adjacent to the ORTEC, Inc. detector production facility and a ten-minute drive from the Cherokee Caverns, which allowed convenient underground storage of the Ge between processing steps. Finally, each part was tracked through its history with a detailed database [93]. These procedures resulted in significant reductions in the low energy background, especially tritium β-decay, and opened the door to searching for other physics.…”

Section: The Majorana Experimentsmentioning

confidence: 99%

The Search for Double Beta Decay With Germanium Detectors: Past, Present, and Future

Avignone

Elliott

2019

Front. Phys.

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“…Water based lubricants were the only cutting fluids used if necessary along with deionized water. All parts generated were uniquely tracked through machining, cleaning and assembly by a custom-built database [5] tracking any piece back to the original mandrel and bath chemistry for quality control. Located inside the Demonstrator detector room at the Davis campus is a dedicated clean wet laboratory operating at better standards than the outer laboratory space.…”

Section: Contamination Controlmentioning

confidence: 99%

Contamination control and assay results for the Majorana Demonstrator ultra clean components

Christofferson

Abgrall

Alvis

et al. 2018

AIP Conference Proceedings

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Abstract. The Majorana Demonstrator is a neutrinoless double beta decay experiment utilizing enriched Ge-76 detectors in 2 separate modules inside of a common solid shield at the Sanford Underground Research Facility. The Demonstrator has utilized world leading assay sensitivities to develop clean materials and processes for producing ultra-pure copper and plastic components. This experiment is now operating, and initial data provide new insights into the success of cleaning and processing. Post production copper assays after the completion of Module 1 showed an increase in U and Th contamination in finished parts compared to starting bulk material. A revised cleaning method and additional round of surface contamination studies prior to Module 2 construction have provided evidence that more rigorous process control can reduce surface contamination. This article describes the assay results and discuss further studies to take advantage of assay capabilities for the purpose of maintaining ultra clean fabrication and process design.

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The Majorana Parts Tracking Database

Cited by 16 publications

References 15 publications

Search for neutrinoless double- β decay in Ge76 with 26 kg yr of exposure from the Majorana Demonstrator

Search for neutrinoless double- β decay in Ge76 with 26 kg yr of exposure from the Majorana Demonstrator

The Search for Double Beta Decay With Germanium Detectors: Past, Present, and Future

Contamination control and assay results for the Majorana Demonstrator ultra clean components

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