Transition rates of high-spin states inCo56andFe56: Possible coexistence of prolate- and oblate-like configurations inFe56
- 1 October 1976
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review C
- Vol. 14 (4) , 1412-1428
- https://doi.org/10.1103/physrevc.14.1412
Abstract
The decay properties of the high-spin states in and have been investigated via the and reactions in the energy range 20.4-29.5 MeV. From measurements of excitation functions and angular distributions of individual rays with a Ge(Li)-NaI(T1) anti-Compton spectrometer, and from -coincidence experiments new levels in have been identified at 2282.6 (), 2371.9 (), 3638.0 (), 4180.2 (), and 5274.6 () keV with the deduced values in parentheses. Similarly levels in have been confirmed at 3388.4 (), 3755.8 (), 4700.6 (), 5255.3 (), and 5626.8 () keV and the values in parentheses have been deduced. The angular distributions in conjunction with the associated attenuation factors were analyzed to yield multipole mixing ratios .The mean lifetimes of these states were also carefully measured by extrapolation to the detection threshold of the effective mean lifetimes extracted from Doppler-broadened line shapes obtained at four bombardment energies between 20.4 and 29.5 MeV. The values obtained in are 2282.6 KeV (>2000 fs), 2371.9 keV (60 ± 30 fs), 3638.0 keV ( fs), 4180.2 keV (590 ± 60 fs), and 5274.6 keV ( fs); and those in are 3388.4 keV (>2000 fs), 3755.8 keV ( fs), 4700.6 keV (120 ± 40 fs), 5255.3 keV (500 ± 50 fs), and 5626.8 keV ( fs). For most of the transitions from the high-spin states in and values were obtained. The results for are compared with recent calculations based on the aligned coupling scheme indicating possible coexistence of quasiband structures with prolate- and oblate-like configurations. The results for are compared with other recent shell-model calculations and good agreement is observed.
Keywords
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