Electronic Resource
Springer
Journal of low temperature physics
93 (1993), S. 239-244
ISSN:
1573-7357
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Low energy beta spectra are studied with sources encapsulated in a superconducting Sn absorber. An NTD germanium thermistor measures the temperature transient (≈5 msec) caused by individual beta decays, and the total energy not given to the neutrino is determined with a resolution of ≈0.5 keV (FWHM) and a threshold of ≈5 keV. The response function is determined from the mono-energetic electron capture and internal conversion source109 Cd, both separately and simultaneously with the beta spectrum. The endpoint of the unique first-forbidden decay107 Pd →107 Ag+e −+ $$\bar v$$ e is found to be37.5±0.1 keV. High statistics results are compared to the unique first-forbidden shape and the atomic exchange correction. The latter is seen for the first time. Preliminary results of a search for heavy neutrino admixtures are0.15±0.33%.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00693426
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