Transition from collective to noncollective rotation at high spin in N approx. = 87 nuclei
The systematics of the (E2) ..gamma.. ray transition energies and the available lifetime data are used to characterize the excitation modes of the light rare-earth nuclei (N greater than or equal to 82) at different spins. The results, which include our recently obtained data on /sup 149/Gd, /sup 154/Ho, /sup 155/Er, /sup 157/Yb and /sup 158/Yb nuclei, indicate that, at low spins, the nuclear excitation mode (shapes) change from single-particle excitations (weakly oblate) in N less than or equal to 85 nuclei to quasi-vibrational (soft triaxial) in N = 86, weakly rotational (prolate) in N = 87, and rotational (prolate) in the N greater than or equal to 88 systems. At higher angular momenta, all these nuclei show a general tendency to traverse the (epsilon,..gamma..) plane towards the oblate axis, and to eventually adopt the aligned coupling mode of excitation.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA); Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6297870
- Report Number(s):
- BNL-32902; CONF-821143-7; ON: DE83011640
- Resource Relation:
- Conference: High angular momentum properties of nuclei conference, Oak Ridge, TN, USA, 2 Nov 1982; Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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GADOLINIUM 149
HIGH SPIN STATES
HOLMIUM 154
RARE EARTH NUCLEI
ANGULAR MOMENTUM
COLLECTIVE EXCITATIONS
E2-TRANSITIONS
ENERGY LEVELS
GAMMA SPECTRA
ISOTONIC NUCLEI
LIFETIME
NEUTRON-DEFICIENT ISOTOPES
ALPHA DECAY RADIOISOTOPES
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
EXCITATION
GADOLINIUM ISOTOPES
HOLMIUM ISOTOPES
INTERMEDIATE MASS NUCLEI
ISOTOPES
MINUTES LIVING RADIOISOTOPES
MULTIPOLE TRANSITIONS
NUCLEI
ODD-ODD NUCLEI
RADIOISOTOPES
RARE EARTH ISOTOPES
SPECTRA
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