Evaluation of radioactive background rejection in 76Ge neutrino-lessdouble-beta decay experiments using a highly segmented HPGe detector Page: 1 of 14
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Evaluation of radioactive background rejection
in 76Ge neutrino-less double-beta decay
experiments using a highly segmented HPGe
D.B. Campbella* K. Vetter a R. Henning b K. Lesko b
Y.D. Chanb A.W.P. Poonb M. Perry b' D. Hurley b
A.R. Smith b
aLawrence Livermore National Laboratory, Livermore, CA 94551, USA
bLawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
CFlorida State University, Tallahassee, FL 32306, USA
A highly segmented coaxial HPGe detector was operated in a low background count-
ing facility for over 1 year to experimentally evaluate possible segmentation strate-
gies for the proposed Majorana neutrino-less double-beta decay experiment. Seg-
mentation schemes were evaluated on their ability to reject multi-segment events
while retaining single-segment events. To quantify a segmentation scheme's accep-
tance efficiency the percentage of peak area due to single segment events was cal-
culated for peaks located in the energy region 911-2614 keV. Single interaction site
events were represented by the double-escape peak from the 2614 keV decay in 208T1
located at 1592 keV. In spite of its prototypical nature, the detector performed well
under realistic operating conditions and required only minimal human interaction.
Though the energy resolution for events with interactions in multiple segments was
impacted by inter-segment cross-talk, the implementation of a cross-talk correlation
matrix restored acceptable resolution. Additionally, simulations utilizing the MaGe
simulation package were performed and found to be in good agreement with exper-
imental observations verifying the external nature of the background radiation.
Key words: 76Ge, Segmentation, Neutrino-less double-beta decay, Ge detector
PACS: code, code
* Corresponding Author. Tel.: +1 925 422 5271 fax: +1 925 424 3101
Email address: email@example.com (D.B. Campbell).
Preprint submitted to Elsevier
18 July 2008
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Chan, Yuen-Dat; Campbell, D.B.; Vetter, K.; Henning, R.; Lesko, K.; Chan, Y.D. et al. Evaluation of radioactive background rejection in 76Ge neutrino-lessdouble-beta decay experiments using a highly segmented HPGe detector, article, February 5, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc898254/m1/1/: accessed June 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.