THE DECAY OF THE 1.25 MINUTE NUCLEAR ISOMER Dy$sup 165$m

Journal Article · Thu Dec 31 23:00:00 EST 1959 · Z. Physik

DOI:https://doi.org/10.1007/BF01338465· OSTI ID:4172617

Tornau, R

The decay of Dy/sup 165m/ (1.25 min), produced by thermal neutron bcmbardment of Dy/sub 2/O/sub 3/, was studied with the aid of scintillation spectrcmeters. The ratio of cross sections for activation of Dy/sup 165m/ (1.25 min) and Dy/sup 165/(2.3 hr was found to be 0.654 plus or minus 0.017. The K- conversion coefficient of the 108.0 kev gamma ray of Dy/sup 165m/ was determined to be alpha /sub K/ = 3.62 plus or minus 0.22, which agreed with the theoretical value for deexcitation by E/syb/3/ transition. The branching ratio of the decay of Dyt/sup 165m/ was (97.6 plus or minus 0,3)% isomeric transition leading to the Dyt/sup 165/ ground state and (2.4 plus or minus 0.3)% beta -decay leading to excited states of Ho/sup 165/. The beta ray spectrum was measured for the first time and was composed of two components with maximum energies (890 plus or minus 50) kev for (87 plus or minus 5)% and (1020 plus or minus 80) kev for (13 plus or minus 5)%. The most probable spin assignments for the 515 and 356 kev states of Ho/sup 165/ are 3/2/sup -/ and 3/2/ sup +/, respectively. (auth)

• Research Organization: Universitat, Gottingen, Ger.
• Sponsoring Organization: USDOE
• NSA Number: NSA-14-018498
• OSTI ID: 4172617
• Journal Information: Z. Physik, Journal Name: Z. Physik Vol. Vol: 159
• Country of Publication: Country unknown/Code not available
• Language: German

Related Subjects

ACTIVATION
BETA DECAY
BRANCHING RATIO
CAPTURE
CROSS SECTIONS
DECAY
DYSPROSIUM 165
DYSPROSIUM OXIDES
ELECTRONS
ENERGY LEVELS
EXCITATION
GAMMA RADIATION
HALF-LIFE
HOLMIUM 165
INTERNAL CONVERSION
ISOMERS
MEASURED VALUES
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
PHYSICS
SCINTILLATION COUNTERS
SPECTRA
SPIN
TRANSIENTS