Nonzero Quadrupole Moments of Candidate Tetrahedral Bands

Journal Article · Fri Jan 15 04:00:00 EST 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.104.022501· OSTI ID:21386898

Bark, R A; Lawrie, E A; Lawrie, J J; Mullins, S M; Murray, S H. T.; Ncapayi, N J; Smit, F D ^[1]; Sharpey-Schafer, J F; Lindsay, R ^[2]; Maliage, S M; Madiba, T E; Komati, F S; Maine, P; Ramashidza, T M; Vymers, P ^[1]

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1. iThemba LABS, P.O. Box 722, Somerset West, 7129 (South Africa)
2. Department of Physics, University of the Western Cape, P/B X17, Bellville, ZA-7535 (South Africa)

Negative-parity bands in the vicinity of {sup 156}Gd and {sup 160}Yb have been suggested as candidates for the rotation of tetrahedral nuclei. We report the observation of the odd and even-spin members of the lowest energy negative-parity bands in {sup 160}Yb and {sup 154}Gd. The properties of these bands are similar to the proposed tetrahedral band of {sup 156}Gd and its even-spin partner. Band-mixing calculations are performed and absolute and relative quadrupole moments deduced for {sup 160}Yb and {sup 154}Gd. The values are inconsistent with zero, as required for tetrahedral shape, and the bands are interpreted as octupole vibrational bands. The failure to observe the in-band E2 transitions of the bands at low spins can be understood using the measured B(E1) and B(E2) values.

• OSTI ID: 21386898
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 2 Vol. 104; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR MOMENTUM
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
E2-TRANSITIONS
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXCITED STATES
GADOLINIUM 154
GADOLINIUM 156
GADOLINIUM ISOTOPES
INTERMEDIATE MASS NUCLEI
ISOTOPES
MINUTES LIVING RADIOISOTOPES
MULTIPOLE TRANSITIONS
MULTIPOLES
NUCLEI
OCTUPOLES
PARITY
PARTICLE PROPERTIES
QUADRUPOLE MOMENTS
RADIOISOTOPES
RARE EARTH NUCLEI
SPIN
STABLE ISOTOPES
VIBRATIONAL STATES
YTTERBIUM 160
YTTERBIUM ISOTOPES