The Isotopic Constitution of Lanthanum and Cerium
Open Access
- 15 November 1947
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 72 (10) , 967-970
- https://doi.org/10.1103/PhysRev.72.967
Abstract
The isotopic abundances of lanthanum and cerium have been determined by means of a mass spectrometer. In addition to the known lanthanum isotope of mass 139, a new isotope of mass 138 and abundance 0.089 percent has been discovered. Since this isotope is isobaric with two neighboring stable isotopes it should be radioactive. No activity was observed. Upper limits for the non-existence of other lanthanum isotopes were determined. The abundances of cerium isotopes of masses 136, 138, 140, and 142 were shown to be 0.193, 0.250, 88.48, and 11.07 percent, respectively. Upper limits for the non-existence of other cerium isotopes were determined.Keywords
This publication has 8 references indexed in Scilit:
- Design of Dynamic Condenser ElectrometersReview of Scientific Instruments, 1947
- Measurement of Relative Abundance with the Mass SpectrometerJournal of Applied Physics, 1942
- Relative Abundances of the Oxygen IsotopesPhysical Review B, 1941
- A Mass Spectrometer for Routine Isotope Abundance MeasurementsReview of Scientific Instruments, 1940
- The Energy Content of the Heavy NucleiPhysical Review B, 1938
- Filament Sources of Positive IonsPhysical Review B, 1936
- The Isotopic Constitution of Barium and CeriumPhysical Review B, 1936
- CXIX. The mass-spectra of chemical elements.—Part VI. Accelerated anode rays continuedJournal of Computers in Education, 1925