Influence of physical and chemical environments on the decay rates of 7Be and 40K

Autor:	Yuen-Dat Chan, G. A. Rech, Eric B. Norman, Ruth-Mary Larimer, Edgardo Browne, A. R. Smith, M.R Dragowsky, M. C. P. Isaac, R. J. McDonald
Jazyk:	angličtina
Předmět:	Physics Nuclear and High Energy Physics 40K Electron capture Potassium Tantalum chemistry.chemical_element Solar neutrino problem Potassium-40 chemistry.chemical_compound chemistry Boron nitride 7Be Gamma spectroscopy Electron-capture decay Graphite Gamma-ray spectroscopy Atomic physics
Zdroj:	Physics Letters B. (1-2):15-22
ISSN:	0370-2693
DOI:	10.1016/S0370-2693(01)01097-8
Popis:	We measured the electron-capture decay rate of 7Be implanted into hosts of graphite, boron nitride, tantalum, and gold. We have found that this decay rate varies by as much as 0.38% from one host to another. We also measured the electron-capture decay rate of 40K in four different chemical compounds and as both a solid and dissolved in solution. To within our measurement precision of ±1%, we have found no influence of the environment on the 40K decay rate. The implications of these results for the solar neutrino problem and for potassium/argon dating are discussed.
Databáze:	OpenAIRE
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