COULOMB EXCITATION OF SECOND 2$sup +$ STATES IN EVEN-EVEN MEDIUM WEIGHT NUCLEI
The location of a second 2/sup +/ state was found for thirteen even-even medium-weight nuclei by means of Coulomb excitation produced by 8-. 9-. and 10- Mev alpha particles. The relatively weak excitation of these states is detected by a coincident measurement of the cascade gamma rays. From the observed gamma-ray yields. information is obtained on the B(E2)'s for the crossover transitions. The crossover B(E2)'s exhibit some uniformity and are all rather weak, being about single-particle value or a littie less. For some nuclei the cascades/crossovers ratio for the second 2/sup +/ state is known from other work, and it is then possible to extract the B(E2) for the upper cascade transition. These upper cascade B(E2)'s exhibit enhancements comparable to those for the lower cascade transitions. Evidence is obtained for the "double E2" Coulomb excitation of the 4/sup +/ state in Cd/sup 114/ and this requires an enhanced 4 - 2 B(E2). In general, the measurements reported support a collective model interpretation, but it is as yet difficult to draw conclusions concerning the shape of the collective potential energy surface governing this motion. (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn.
- NSA Number:
- NSA-15-006853
- OSTI ID:
- 4120873
- 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- Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 121; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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