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Title: Background Model for the Majorana Demonstrator

Abstract

The Majorana Collaboration is constructing a prototype system containing 40 kg of HPGe detectors to demonstrate the feasibility and potential of a future tonne-scale experiment to search for neutrinoless double-beta (0v BB) decay in 76Ge. In view of the requirement that the next generation of tonne-scale Ge-based 0vBB-decay experiment be capable of probing the neutrino mass scale in the inverted-hierarchy region, a major goal of theMajorana Demonstrator is to demonstrate a path forward to achieving a background rate at or below 1 cnt/(ROI-t-y) in the 4 keV region of interest around the Q-value at 2039 keV. This goal is pursued through a combination of a significant reduction of radioactive impurities in construction materials with analytical methods for background rejection, for example using powerful pulse shape analysis techniques profiting from the p-type point contact HPGe detectors technology. The effectiveness of these methods is assessed using Geant4 simulations of the different background components whose purity levels are constrained from radioassay measurements.

Authors:
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Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1244804
Report Number(s):
PNNL-SA-102048
Journal ID: ISSN 1875-3892; 830403000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics Procedia; Journal Volume: 61
Country of Publication:
United States
Language:
English

Citation Formats

Cuesta, C., Abgrall, N., Aguayo, Estanislao, Avignone, Frank T., Barabash, Alexander S., Bertrand, F., Boswell, M., Brudanin, V., Busch, Matthew, Byram, D., Caldwell, A. S., Chan, Yuen-Dat, Christofferson, Cabot-Ann, Combs, Dustin C., Detwiler, Jason A., Doe, Peter J., Efremenko, Yuri, Egorov, Viatcheslav, Ejiri, H., Elliott, S. R., Fast, James E., Finnerty, P., Fraenkle, Florian, Galindo-Uribarri, A., Giovanetti, G. K., Goett, J., Green, M. P., Gruszko, J., Guiseppe, Vincente, Gusev, K., Hallin, A. L., Hazama, R., Hegai, A., Henning, Reyco, Hoppe, Eric W., Howard, Stanley, Howe, M. A., Keeter, K., Kidd, M. F., Kochetov, Oleg, Konovalov, S., Kouzes, Richard T., Laferriere, Brian D., Leon, Jonathan D., Leviner, L., Loach, J. C., MacMullin, J., MacMullin, S., Martin, R. D., Meijer, S. J., Mertens, S., Nomachi, Masaharu, Orrell, John L., O'Shaughnessy, C., Overman, Nicole R., Phillips, D., Poon, Alan, Pushkin, K., Radford, D. C., Rager, J., Rielage, Keith, Robertson, R. G. H., Romero-Romero, E., Ronquest, M. C., Schubert, Alexis G., Shanks, B., Shima, T., Shirchenko, M., Snavely, Kyle J., Snyder, N., Suriano, Anne-Marie, Thompson, J., Timkin, V., Tornow, Werner, Trimble, J. E., Varner, R. L., Vasilyev, Sergey, Vetter, Kai, Vorren, Kris R., White, Brandon R., Wilkerson, J. F., Wiseman, C., Xu, W., Yakushev, E., Young, A., Yu, Chang-Hong, and Yumatov, Vladimir. Background Model for the Majorana Demonstrator. United States: N. p., 2015. Web. doi:10.1016/j.phpro.2015.06.001.
Cuesta, C., Abgrall, N., Aguayo, Estanislao, Avignone, Frank T., Barabash, Alexander S., Bertrand, F., Boswell, M., Brudanin, V., Busch, Matthew, Byram, D., Caldwell, A. S., Chan, Yuen-Dat, Christofferson, Cabot-Ann, Combs, Dustin C., Detwiler, Jason A., Doe, Peter J., Efremenko, Yuri, Egorov, Viatcheslav, Ejiri, H., Elliott, S. R., Fast, James E., Finnerty, P., Fraenkle, Florian, Galindo-Uribarri, A., Giovanetti, G. K., Goett, J., Green, M. P., Gruszko, J., Guiseppe, Vincente, Gusev, K., Hallin, A. L., Hazama, R., Hegai, A., Henning, Reyco, Hoppe, Eric W., Howard, Stanley, Howe, M. A., Keeter, K., Kidd, M. F., Kochetov, Oleg, Konovalov, S., Kouzes, Richard T., Laferriere, Brian D., Leon, Jonathan D., Leviner, L., Loach, J. C., MacMullin, J., MacMullin, S., Martin, R. D., Meijer, S. J., Mertens, S., Nomachi, Masaharu, Orrell, John L., O'Shaughnessy, C., Overman, Nicole R., Phillips, D., Poon, Alan, Pushkin, K., Radford, D. C., Rager, J., Rielage, Keith, Robertson, R. G. H., Romero-Romero, E., Ronquest, M. C., Schubert, Alexis G., Shanks, B., Shima, T., Shirchenko, M., Snavely, Kyle J., Snyder, N., Suriano, Anne-Marie, Thompson, J., Timkin, V., Tornow, Werner, Trimble, J. E., Varner, R. L., Vasilyev, Sergey, Vetter, Kai, Vorren, Kris R., White, Brandon R., Wilkerson, J. F., Wiseman, C., Xu, W., Yakushev, E., Young, A., Yu, Chang-Hong, & Yumatov, Vladimir. Background Model for the Majorana Demonstrator. United States. doi:10.1016/j.phpro.2015.06.001.
Cuesta, C., Abgrall, N., Aguayo, Estanislao, Avignone, Frank T., Barabash, Alexander S., Bertrand, F., Boswell, M., Brudanin, V., Busch, Matthew, Byram, D., Caldwell, A. S., Chan, Yuen-Dat, Christofferson, Cabot-Ann, Combs, Dustin C., Detwiler, Jason A., Doe, Peter J., Efremenko, Yuri, Egorov, Viatcheslav, Ejiri, H., Elliott, S. R., Fast, James E., Finnerty, P., Fraenkle, Florian, Galindo-Uribarri, A., Giovanetti, G. K., Goett, J., Green, M. P., Gruszko, J., Guiseppe, Vincente, Gusev, K., Hallin, A. L., Hazama, R., Hegai, A., Henning, Reyco, Hoppe, Eric W., Howard, Stanley, Howe, M. A., Keeter, K., Kidd, M. F., Kochetov, Oleg, Konovalov, S., Kouzes, Richard T., Laferriere, Brian D., Leon, Jonathan D., Leviner, L., Loach, J. C., MacMullin, J., MacMullin, S., Martin, R. D., Meijer, S. J., Mertens, S., Nomachi, Masaharu, Orrell, John L., O'Shaughnessy, C., Overman, Nicole R., Phillips, D., Poon, Alan, Pushkin, K., Radford, D. C., Rager, J., Rielage, Keith, Robertson, R. G. H., Romero-Romero, E., Ronquest, M. C., Schubert, Alexis G., Shanks, B., Shima, T., Shirchenko, M., Snavely, Kyle J., Snyder, N., Suriano, Anne-Marie, Thompson, J., Timkin, V., Tornow, Werner, Trimble, J. E., Varner, R. L., Vasilyev, Sergey, Vetter, Kai, Vorren, Kris R., White, Brandon R., Wilkerson, J. F., Wiseman, C., Xu, W., Yakushev, E., Young, A., Yu, Chang-Hong, and Yumatov, Vladimir. Mon . "Background Model for the Majorana Demonstrator". United States. doi:10.1016/j.phpro.2015.06.001.
@article{osti_1244804,
title = {Background Model for the Majorana Demonstrator},
author = {Cuesta, C. and Abgrall, N. and Aguayo, Estanislao and Avignone, Frank T. and Barabash, Alexander S. and Bertrand, F. and Boswell, M. and Brudanin, V. and Busch, Matthew and Byram, D. and Caldwell, A. S. and Chan, Yuen-Dat and Christofferson, Cabot-Ann and Combs, Dustin C. and Detwiler, Jason A. and Doe, Peter J. and Efremenko, Yuri and Egorov, Viatcheslav and Ejiri, H. and Elliott, S. R. and Fast, James E. and Finnerty, P. and Fraenkle, Florian and Galindo-Uribarri, A. and Giovanetti, G. K. and Goett, J. and Green, M. P. and Gruszko, J. and Guiseppe, Vincente and Gusev, K. and Hallin, A. L. and Hazama, R. and Hegai, A. and Henning, Reyco and Hoppe, Eric W. and Howard, Stanley and Howe, M. A. and Keeter, K. and Kidd, M. F. and Kochetov, Oleg and Konovalov, S. and Kouzes, Richard T. and Laferriere, Brian D. and Leon, Jonathan D. and Leviner, L. and Loach, J. C. and MacMullin, J. and MacMullin, S. and Martin, R. D. and Meijer, S. J. and Mertens, S. and Nomachi, Masaharu and Orrell, John L. and O'Shaughnessy, C. and Overman, Nicole R. and Phillips, D. and Poon, Alan and Pushkin, K. and Radford, D. C. and Rager, J. and Rielage, Keith and Robertson, R. G. H. and Romero-Romero, E. and Ronquest, M. C. and Schubert, Alexis G. and Shanks, B. and Shima, T. and Shirchenko, M. and Snavely, Kyle J. and Snyder, N. and Suriano, Anne-Marie and Thompson, J. and Timkin, V. and Tornow, Werner and Trimble, J. E. and Varner, R. L. and Vasilyev, Sergey and Vetter, Kai and Vorren, Kris R. and White, Brandon R. and Wilkerson, J. F. and Wiseman, C. and Xu, W. and Yakushev, E. and Young, A. and Yu, Chang-Hong and Yumatov, Vladimir},
abstractNote = {The Majorana Collaboration is constructing a prototype system containing 40 kg of HPGe detectors to demonstrate the feasibility and potential of a future tonne-scale experiment to search for neutrinoless double-beta (0v BB) decay in 76Ge. In view of the requirement that the next generation of tonne-scale Ge-based 0vBB-decay experiment be capable of probing the neutrino mass scale in the inverted-hierarchy region, a major goal of theMajorana Demonstrator is to demonstrate a path forward to achieving a background rate at or below 1 cnt/(ROI-t-y) in the 4 keV region of interest around the Q-value at 2039 keV. This goal is pursued through a combination of a significant reduction of radioactive impurities in construction materials with analytical methods for background rejection, for example using powerful pulse shape analysis techniques profiting from the p-type point contact HPGe detectors technology. The effectiveness of these methods is assessed using Geant4 simulations of the different background components whose purity levels are constrained from radioassay measurements.},
doi = {10.1016/j.phpro.2015.06.001},
journal = {Physics Procedia},
number = ,
volume = 61,
place = {United States},
year = {Mon Jun 01 00:00:00 EDT 2015},
month = {Mon Jun 01 00:00:00 EDT 2015}
}
  • The Majorana Collaboration is constructing a system containing 40 kg of HPGe detectors to demonstrate the feasibility and potential of a future tonne-scale experiment capable of probing the neutrino mass scale in the inverted-hierarchy region. To realize this, a major goal of the Majorana Demonstrator is to demonstrate a path forward to achieving a background rate at or below 1 cnt/(ROI-t-y) in the 4 keV region of interest around the Q-value at 2039 keV. This goal is pursued through a combination of a significant reduction of radioactive impurities in construction materials with analytical methods for background rejection, for example usingmore » powerful pulse shape analysis techniques profiting from the p-type point contact HPGe detectors technology. The effectiveness of these methods is assessed using simulations of the different background components whose purity levels are constrained from radioassay measurements.« less
  • The MAJORANA DEMONSTRATOR (MJD) is an ultra-low background neutrinoless double-beta decay (0νββ) experiment that will deploy up to 40 kg of high purity germanium detectors (HPGe). The goal of this experiment is to demonstrate the feasibility of building a detector array with less than 1 event/ton-year in a 4 keV region of interest around the 0νββ signal. HPGe diodes, when used as ionizing radiation detectors, need to be maintained at a temperature close to that of liquid nitrogen (77 K). This work describes the R&D results of a cryogenic system capable of meeting the requirements of low background and themore » cooling capacity required to successfully operate such a detector system. The MJD germanium detector modules will operate at liquid nitrogen temperature to provide adequate cooling for a full range of HPGe impurity concentrations. This paper shows the experimental results obtained using a two-phase horizontal thermosyphon using liquid nitrogen as the MJD’s cooling system. The cold test shows that the proposed thermosyphon has sufficient cooling power to handle the heat load of an MJD module. Results for the temperature gradient across the thermosyphon, cooling capacity, and design considerations demonstrate that the thermosyphon can effectively remove the calculated heat load of each module of the experiment. The thermosyphon will be bolted to a cold plate from which detector strings will hang. The thermal conductivity of a mockup of the MJD bolted thermal joint is experimentally determined to be below 0.1 K/W.« less
  • The MAJORANA Collaboration will seek neutrinoless double beta decay (0νββ) in {sup 76}Ge using isotopically enriched p-type point contact (PPC) high purity Germanium (HPGe) detectors. A tonne-scale array of HPGe detectors would require background levels below 1 count/ROI-tonne-year in the 4 keV region of interest (ROI) around the 2039 keV Q-value of the decay. In order to demonstrate the feasibility of such an experiment, the MAJORANA DEMONSTRATOR, a 40 kg HPGe detector array, is being constructed with a background goal of < 3 count/ROI-tonne-year, which is expected to scale down to < 1 count/ROI-tonne-year for a tonne-scale experiment. The signalmore » readout electronics, which must be placed in close proximity to the detectors, present a challenge toward reaching this background goal. This talk will discuss the materials and design used to construct signal readout electronics with low enough backgrounds for the MAJORANA DEMONSTRATOR.« less
  • The MAJORANA Collaboration is constructing the MAJORANA DEMONSTRATOR, an ultra-low background, 40- kg modular HPGe detector array to search for neutrinoless double beta decay in {sup 76}Ge. In view of the next generation of tonne-scale Ge-based 0νβ β-decay searches that will probe the neutrino mass scale in the inverted-hierarchy region, a major goal of the MAJORANA DEMONSTRATOR is to demonstrate a path forward to achieving a background rate at or below 1 count/tonne/year in the 4 keV region of interest around the Q-value at 2039 keV. The background rejection techniques to be applied to the data include cuts based onmore » data reduction, pulse shape analysis, event coincidences, and time correlations. The Point Contact design of the DEMONSTRATOR’s germanium detectors allows for significant reduction of gamma background.« less
  • The Majorana Demonstrator is a planned 40 kg array of Germanium detectors intended to demonstrate the feasibility of constructing a tonne-scale experiment that will seek neutrinoless double beta decay (0νββ) in 76Ge. In such an experiment we require backgrounds of less than 1 count/tonne-year in the 4 keV region of interest around the 2039 keV Q-value of the ββ decay. Moreover, designing low-noise electronics, which must be placed in close proximity to the detectors, presents a challenge to reaching this background target. Finally, this paper will discuss the Majorana collaboration's solutions to some of these challenges.