Energy Levels inTm17269from the Decay ofEr17268
- 1 August 1961
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 123 (3), 992-996
- https://doi.org/10.1103/physrev.123.992
Abstract
The radioactive nuclide was produced in the Materials Testing Reactor, Arco, Idaho by the successive capture of two neutrons in erbium oxide enriched in . In addition to three erbium activities and the radioactive daughter, these samples contained six active contaminants from which the erbium was separated by use of an ion-exchange column. Scintillation studies, conducted with a 256-channel coincidence scintillation spectrometer, indicate the presence of at least eight gamma-ray transitions. Two of these transitions are either highly converted or their transition energies are approximately 50 kev. The energies of the other six transitions are about 610, 450, 408, 200, 160, and 125 kev. Beta-gamma coincidence experiments indicate the presence of two beta-ray components at approximately 310 kev (in coincidence with the 610-kev gamma ray) and 370 kev (in coincidence with the 408-kev gamma ray). The level scheme deduced for has excited states at 408, 450 (or 160), 470±15, 530, and 610 kev. From the beta-ray intensities, the states at 530 and 610 kev are assigned spins of either 0 or 1 with positive parity. The spin and parity () of the thulium ground state have previously been assigned from the properties of the decay of .
Keywords
This publication has 4 references indexed in Scilit:
- Decay ofTm172Physical Review B, 1961
- Decay ofandPhysical Review B, 1961
- Decay ofDy16666Physical Review B, 1960
- New Isotopes:Er172andTm172Physical Review B, 1956