ENERGY LEVELS IN $sub 6$$sub 9$Tm$sup 172$ FROM THE DECAY OF $sub 6$$sub 8$Er$sup 17$$sup 2$

Journal Article · Tue Aug 01 04:00:00 EDT 1961 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.123.992· OSTI ID:4842367

Helmer, R G; Burson, S B

The radioactive nuclide Er/sup 172/ was produced in the Materials Testing Reactor, Arco, Idaho by the successive capture of two neutrons in erbium oxide enriched in Er/sup 170/. In addition to three erbium activities and the radioactive Tm/sup 172/ 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 K converted or their transition energies are approximately 50 kev. The energies of the other six transitions are about dence 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 Tm/sup 172/ has excited states at 408, 450 (or 160), 470 plus or minus 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 (2/sup -/) of the thulium ground state have previously been assigned from the properties of the decay of Tm/sup 172/. (auth)

• Research Organization: Argonne National Lab., Ill.
• NSA Number: NSA-15-026975
• OSTI ID: 4842367
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 123; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BETA DECAY
CAPTURE
COINCIDENCE METHODS
DECAY
ENERGY LEVELS
ENRICHMENT
ERBIUM 170
ERBIUM 172
ERBIUM OXIDES
EV RANGE
GAMMA RADIATION
INTERNAL CONVERSION
ION EXCHANGE
MEASURED VALUES
NEUTRONS
NUCLEAR REACTIONS
PHYSICS
PULSE ANALYZERS
SCINTILLATION COUNTERS
SEPARATION PROCESSES
SPECTROMETERS
THULIUM 172
TRANSIENTS