A novel experimental system for the KDK measurement of the 40K decay scheme relevant for rare event searches
| Autor: | Jelena Ninkovic, P. Lechner, K.C. Goetz, K. Dering, Eric Lukosi, P. Squillari, H. Davis, Charles L. Melcher, Jouni Suhonen, N. T. Brewer, A. Fijałkowska, D. W. Stracener, P. Di Stefano, Z. Gai, Itay Yavin, B. C. Rasco, K. P. Rykaczewski, F. Petricca, P. Davis, Luis Stand, M. Constable, Robert Grzywacz, L. Hariasz, M. Mancuso, Christopher M. Rouleau, M. Stukel, Yuan Liu, Marzena Wolinska-Cichocka, Joel Kostensalo |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Nuclear and High Energy Physics Physics - Instrumentation and Detectors Decay scheme Silicon drift detector Spectrometer Physics::Instrumentation and Detectors 010308 nuclear & particles physics Electron capture Branching fraction Detector FOS: Physical sciences Instrumentation and Detectors (physics.ins-det) Scintillator 7. Clean energy 01 natural sciences Nuclear physics 0103 physical sciences Nuclear Experiment (nucl-ex) 010306 general physics Nuclear Experiment Instrumentation Event (particle physics) |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 1012:165593 |
| ISSN: | 0168-9002 |
| Popis: | Potassium-40 ($^{40}$K) is a long-lived, naturally occurring radioactive isotope. The decay products are prominent backgrounds for many rare event searches, including those involving NaI-based scintillators. $^{40}$K also plays a role in geochronological dating techniques. The branching ratio of the electron capture directly to the ground state of argon-40 has never been measured, which can cause difficulty in interpreting certain results or can lead to lack of precision depending on the field and analysis technique. The KDK (Potassium (K) Decay (DK)) collaboration is measuring this decay. A composite method has a silicon drift detector with an enriched, thermally deposited $^{40}$K source inside the Modular Total Absorption Spectrometer. This setup has been characterized in terms of energy calibration, gamma tagging efficiency, live time and false negatives and positives. A complementary, homogeneous, method is also discussed; it employs a KSr$_2$I$_5$:Eu scintillator as source and detector. Comment: 20 pages, 24 figures, Submitted to NIM A |
| Databáze: | OpenAIRE |
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