Long-term measurements of 36Cl to investigate potential solar influence on the decay rate |
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| Affiliation: | 1. Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;2. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;3. Faculty of Engineering, Yokohama National University, Yokohama 240-8501, Japan;4. Department of Physics, Shandong University, Jinan 250100, China;5. Institute of Modern Physics, Southwest Jiaotong University, Chengdu 610031, China;6. Physics Department of Science School, Tibet University, Lhasa 850000, China;7. Institute for Cosmic Ray Research, University of Tokyo, Kashiwa 277-8582, Japan;1. Institució Catalana de Recerca i Etudes Avançats (ICREA), Spain;2. Departament d’Estructura i Constituents de la Matèria and Institut de Ciencies del Cosmos, Universitat de Barcelona, Diagonal 647, E-08028 Barcelona, Spain;3. C.N. Yang Institute for Theoretical Physics, and Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794-3840, USA;4. Wisconsin IceCube Particle Astrophysics Center and Department of Physics, University of Wisconsin, Madison, WI 53706, USA;1. Department of Physics and Astronomy, Michigan State University, BioMedical Physical Sciences Building, East Lansing, MI 48824, United States;2. Department of Physics and Astronomy, University of California, Irvine, CA 92697, United States;3. Santa Cruz Institute for Particle Physics, University of California, 1156 High Street, Santa Cruz, CA 95064, United States;4. Department of Physics, University of Maryland, College Park, MD 20742, United States;5. Department of Physics, New York University, 4 Washington Place, New York, NY 10003, United States;6. Department of Physics, Pennsylvania State University, University Park, PA 16802, United States;7. Group P-23, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, United States;8. Department of Physics and Astronomy, George Mason University, 4400 University Drive, Fairfax, VA 22030, United States;9. Instituto de Astronomía, Universidad Nacional Autónoma de México, D.F., México 04510, Mexico;10. NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States;11. Department of Physics, Michigan Technological University, Houghton, MI 49931, United States;12. Department of Physics, University of New Hampshire, Morse Hall, Durham, NH 03824, United States;13. University of California Santa Cruz, Natural Science 2, 1156 High Street, Santa Cruz, CA 95064, United States;14. Ohio State University, Lima, OH 45804, United States;15. Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China;1. Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany;2. Eckert & Ziegler Nuclitec GmbH, Gieselweg 1, D-38110 Braunschweig, Germany;3. Eckert & Ziegler Radiopharma GmbH, Robert-Rössle-Straße 10, 13125 Berlin, Germany |
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| Abstract: | Recently, Jenkins et al. 6] reported on fluctuations in the detected decay events of 36Cl which were measured with a Geiger–Müller counter. Experimental data of 32Si measured by means of an end-window gas-flow proportional counter at the Brookhaven National Laboratory show similar periodicity, albeit a different amplitude. Jenkins et al. interpret the fluctuations as evidence of solar influence on the decay rates of beta-decaying radionuclides.In this work, liquid scintillation counting was used to check for potential variations in the 36Cl decay rates. A custom-built counter with three photomultiplier tubes was used. In contrast to commercial counters, the relevant parameters of our system are well controlled and the discrimination threshold and HV setting can be adjusted and checked. The experimental data were analyzed by means of the triple-to-double coincidence ratio (TDCR) method which is a primary method for activity determination. Thus, our results do not depend on any other standard or reference source.Our data show fluctuations which are by more than one order of magnitude lower than those seen in the experiment using a Geiger–Müller counter. More importantly, no oscillation could be identified. Interestingly, our data overlap in time with those from Jenkins et al. 6]. We do not observe the phase and amplitude as seen by Jenkins and conclude that the fluctuations are not due to solar influence. This also implies that the interpretation by Jenkins et al. is false. |
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| Keywords: | Liquid scintillation counting TDCR No evidence for solar influence on the decay rate |
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