LEVELS IN Tb$sup 157$ POPULATED IN THE DECAY OF Dy$sup 15$$sup 7$

Journal Article · Tue Jan 01 04:00:00 EST 1963 · Arkiv Fysik

OSTI ID:4626445

Persson, L; Ryde, H; Oelsner-Ryde, K

The 8.06-hr electron-capture decay of Dy/sup 157/ was investigated in detail using beta and gamma spectrometers. The activity was produced by a (p,3n) reaction on Tb/sup 159/, and the dysprosium fraction was isolated by ion-exchange chrommatography. Nuclear transitions in Tb/sup 157/ were observed with the following energies - 60.82, 83.01, 143.83, 182.20, 265.34, The internal K conversion coefficient of the intense 326-kev gamma ray was measured to be 1.16 x 10/sup -2/, indicating E1 character. From the relative electron and gamma intensities the conversion relations are then deduced for the remaining transitions. From a comparison with the theoretical conversion coefficients the possible multipole orders of the transitions are discussed. The transitions observed having energies below 326 kev are inserted in the decay schemne with excited levels at 61, 144, and 326 Mev. This is in its main features confirmed by coincidence measurements. The transitions with energies above 326 kev, earlier not reported, have very low intensities. New levels in Tb/sup 157/ are suggested having the energies 597, 637, and 992 kev, and the possibility of BETA - and gamma -vibrational character of these levels is discussed. (auth)

• Research Organization: Nobel Inst. of Physics, Stockholm
• NSA Number: NSA-17-041882
• OSTI ID: 4626445
• Journal Information: Arkiv Fysik, Journal Name: Arkiv Fysik Vol. Vol: 24
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BETA PARTICLES
BETA SPECTROMETERS
CAPTURE
CHROMATOGRAPHY
COINCIDENCE METHODS
DECAY
DYSPROSIUM 157
ELECTRONS
ENERGY LEVELS
GAMMA RADIATION
GAMMA SPECTROMETERS
INTERNAL CONVERSION
ION EXCHANGE
MEASURED VALUES
MULTIPOLES
NEUTRONS
NUCLEAR MODELS
OSCILLATIONS
PHYSICS
PROTON BEAMS
RADIOACTIVITY
TERBIUM 157
TERBIUM 159