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Limit on the mass of the electron neutrino from studies of inner bremsstrahlung

Conference · · AIP Conf. Proc.; (United States)
OSTI ID:5822013
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Sources of /sup 193/Pt and /sup 163/Ho decontaminated from other radioactivities by a factor of > 10/sup 13/ have been produced at the ISOLDE facility on-line to the CERN 600 MeV Synchrocyclotron. The /sup 193/Pt was used to verify the theory for inner bremsstrahlung electron capture decay (IBEC). The Q/sub EC/ value is 56,3 +/- 0,3 keV, and the data make it possible to give an upper limit on the electron neutrino mass of 500 eV (90% C.L.). For /sup 163/Ho the partial M electron capture half life was determined to be (4.0 +/- 1,2) x 10/sup 4/ y, from which the authors deduce a half life of (7 +/- 2) x 10/sup 4/ y. Together with the independently measured /sup 163/Ho-/sup 163/Dy mass difference of 2.3 +/- 1.0 keV they imply an upper limit of m/sub nu//sub e/ of 1.3 keV.

Research Organization:
European Organization for Nuclear Research, Geneva, Switzerland
OSTI ID:
5822013
Report Number(s):
CONF-820971-
Journal Information:
AIP Conf. Proc.; (United States), Journal Name: AIP Conf. Proc.; (United States) Vol. 99; ISSN APCPC
Country of Publication:
United States
Language:
English

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Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
651822 -- Nuclear Properties & Reactions
A=150-189
Experimental-- Radioactive Decay-- (-1987)
651922 -- Nuclear Properties & Reactions
A=190-219
Experimental-- Radioactive Decay-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
BETA DECAY
BETA DECAY RADIOISOTOPES
CERN SYNCHROCYCLOTRON
CYCLIC ACCELERATORS
DATA
DAYS LIVING RADIOISOTOPES
DECAY
ELECTRON CAPTURE DECAY
ELECTRON CAPTURE RADIOISOTOPES
ELECTRON NEUTRINOS
ELEMENTARY PARTICLES
ENERGY
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FERMIONS
HALF-LIFE
HEAVY NUCLEI
HOLMIUM 163
HOLMIUM ISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEPTONS
LIMITING VALUES
MASS
MASS DIFFERENCE
MASSLESS PARTICLES
NEUTRINOS
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
PARTICLE PROPERTIES
PLATINUM 193
PLATINUM ISOTOPES
Q-VALUE
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SECONDS LIVING RADIOISOTOPES
SYNCHROCYCLOTRONS
YEARS LIVING RADIOISOTOPES