Beta spectrum studies with cryogenic micro-calorimeters
- Princeton Univ., NJ (United States)
Low energy beta spectra are studied with sources encapsulated in a superconducting Sn absorber. An NTD germanium thermistor measures the temperature transient ([approx] 5 msec) caused by individual beta decays, and the total energy not given to the neutrino is determined with a resolution of [approx] 0.5 keV (FWHM) and a threshold of [approx] 5 keV. The response function is determined from the mono-energetic electron capture and internal conversion source [sup 109]Cd, both separately and simultaneously with the beta spectrum. The endpoint of the unique first-forbidden decay [sup 107]Pd [yields] [sup 107]Ag+e[sup [minus]]+[bar [nu]][sub e] is found to be 37.5 [plus minus] 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 are 0.15 [plus minus] 0.33%.
- OSTI ID:
- 5406604
- Report Number(s):
- CONF-930751--
- Journal Information:
- Journal of Low Temperature Physics; (United States), Journal Name: Journal of Low Temperature Physics; (United States) Vol. 93:3-4; ISSN 0022-2291; ISSN JLTPAC
- Country of Publication:
- United States
- Language:
- English
Similar Records
Cryogenic micro-calorimeters for low energy beta spectroscopy
A massive neutrino in nuclear beta decay
Related Subjects
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
663210* -- Ground-State Radioactivity-- (1992-)
663560 -- Nuclear Mass Ranges-- A=90-149-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANTILEPTONS
ANTIMATTER
ANTINEUTRINOS
ANTIPARTICLES
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CALORIMETERS
DECAY
DESIGN
ELECTRON ANTINEUTRINOS
ELECTRON NEUTRINOS
ELECTRONS
ELEMENTARY PARTICLES
EVEN-ODD NUCLEI
FERMIONS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEPTONS
MASSLESS PARTICLES
MATTER
MEASURING INSTRUMENTS
NEUTRINOS
NUCLEAR DECAY
NUCLEI
ODD-EVEN NUCLEI
PALLADIUM 107
PALLADIUM ISOTOPES
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SILVER 107
SILVER ISOTOPES
STABLE ISOTOPES
YEARS LIVING RADIOISOTOPES