A 6.1 s isomer and rotational bands in $sup 192$Os
A 6.1 plus or minus 0.2 s activity has been observed when natural Os targets were bombarded with 14.5 MeV neutrons. The activity is assigned to the decay of a high-spin isomer in /sup 192/Os at 2015.4 keV, which is depopulated by M2 and E3 transitions. Singles and coincidence gamma -ray spectra have allowed the identification of seven new states in /sup 192/Os. Several of these levels have been placed in either the ground- state or gamma -vibrational bands, which are strongly mixed. Excitation energies, B(E2) ratios for these bands are compared with different theoretical models. (auth) It is shown that, if one uses single-particle energies from experiment and a delta residual interaction, it is not possible to obtain the energy of the giant dipole and spurious states of /sup 208/Pb, and at the same time obtain reasonable results for the low-lying two- particle spectra of /sup 210/Pb or /sup 210/Po. Related to the above problem, the isobaric analog state of /sup 208/Pb (in /sup 208/Bi) comes much too low in calculations using realistic interactions. It is noted that the above difficulties can be overcome, phenomenologically at least, by adding to the effective interaction some longrange repulsive components. The Bansal- French and the Schiffer interactions are examples of these; however, the dipole--dipole component of the Schiffer interaction gives much too large a splitting between the dipole state and spurious state. (auth)
- Research Organization:
- Jgvaeskylae Univ., Finland
- NSA Number:
- NSA-29-025608
- OSTI ID:
- 4352889
- Journal Information:
- Phys. Fenn., v. 8, no. 4, pp. 345-356, Other Information: Orig. Receipt Date: 30-JUN-74; Bib. Info. Source: FINL (Finland (sent to DOE from))
- Country of Publication:
- Finland
- Language:
- English
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