Open AccessSTUDY OF THE TIME DEPENDENCE OF RADIOACTIVITY
Author(s) -
E. Bellotti,
C. Broggini,
G. Di Carlo,
M. Laubenstein,
R. Menegazzo
Publication year - 2013
Publication title -
acta polytechnica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.207
H-Index - 15
eISSN - 1805-2363
pISSN - 1210-2709
DOI - 10.14311/ap.2013.53.0524
Subject(s) - amplitude , physics , spectral line , nuclear physics , oscillation (cell signaling) , germanium , semiconductor detector , analytical chemistry (journal) , chemistry , detector , optics , biochemistry , optoelectronics , chromatography , astronomy , silicon
The activity of a 137 Cs source was measured using a germanium detector installed deep underground in the Gran Sasso Laboratory. In total about 5100 energy spectra, one hour measuring time each, were collected and used to search for time variations of the decay constant with periods from a few hours to 1 year. No signal with amplitude larger than 9.6 × 10 −5 at 95% C.L. was detected. These limits are more than one order of magnitude lower than the values on the oscillation amplitude reported in the literature. The same data give a value of 29.96±0.08 years for the 137 Cs half life, which is in good agreement with the world mean value of 30.05 ± 0.08 years.