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Limits on the release of Rb isotopes from a zeolite based 83mKr calibration source for the XENON project


Hannen, V; Aprile, E; Arneodo, F; Baudis, L; Beck, M; Bokeloh, K; Ferella, A D; Giboni, K L; Lang, R F; Lebeda, O; Ortjohann, H W; Schumann, M; Spalek, A; Venos, D; Weinheimer, C (2011). Limits on the release of Rb isotopes from a zeolite based 83mKr calibration source for the XENON project. Journal of Instrumentation, 6(10):P10013.

Abstract

The isomer 83mKr with its half-life of 1.83 h is an ideal calibration source for a liquid noble gas dark matter experiment like the XENON project. However, the risk of contamination of the detector with traces of the much longer lived mother isotope 83Rb(T½ = 86.2 d) has to be ruled out. In this work the release of 83Rb atoms from a 1.8 MBq 83Rb source embedded in zeolite beads has been investigated. To do so, a cryogenic trap has been connected to the source for about 10 days, after which it was removed and probed for the strongest 83Rbγ-rays with an ultra-sensitive Germanium detector. No signal has been found. The corresponding upper limit on the released 83Rb activity means that the investigated type of source can be used in the XENON project and similar low-background experiments as 83mKr generator without a significant risk of contaminating the detector. The measurements also allow to set upper limits on the possible release of the isotopes 84Rb and 86Rb, traces of which were created alongside the production of 83Rb at the Rez cyclotron.

The isomer 83mKr with its half-life of 1.83 h is an ideal calibration source for a liquid noble gas dark matter experiment like the XENON project. However, the risk of contamination of the detector with traces of the much longer lived mother isotope 83Rb(T½ = 86.2 d) has to be ruled out. In this work the release of 83Rb atoms from a 1.8 MBq 83Rb source embedded in zeolite beads has been investigated. To do so, a cryogenic trap has been connected to the source for about 10 days, after which it was removed and probed for the strongest 83Rbγ-rays with an ultra-sensitive Germanium detector. No signal has been found. The corresponding upper limit on the released 83Rb activity means that the investigated type of source can be used in the XENON project and similar low-background experiments as 83mKr generator without a significant risk of contaminating the detector. The measurements also allow to set upper limits on the possible release of the isotopes 84Rb and 86Rb, traces of which were created alongside the production of 83Rb at the Rez cyclotron.

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Additional indexing

Contributors:
Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2011
Deposited On:13 Feb 2012 07:19
Last Modified:05 Apr 2016 15:34
Publisher:IOP Publishing Ltd
ISSN:1748-0221
Publisher DOI:https://doi.org/10.1088/1748-0221/6/10/P10013
Related URLs:http://arxiv.org/abs/1109.4270
Permanent URL: https://doi.org/10.5167/uzh-58447

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