On the two-quasineutron rotational band in 128 Ba
200020 pages
Published in:
- Nucl.Phys.A 674 (2000) 357-376
- Published: 2000
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Abstract: (Elsevier)
The lifetimes of five levels of the two-quasineutron band in 128 Ba populated via the 116 Cd( 16 O ,4 n) reaction were measured for the first time by means of the recoil-distance Doppler-shift method. For the data-analysis, a new version of the differential decay-curve method in singles-like mode was developed which takes into account the velocity distribution of the recoils and the effect of the Doppler-shift attenuation in the stopper. The high values of 〈K 2 〉 and K eff characterising the band are confirmed by the determined B (E2 ,I→I−2 ) and B (M1 ,I→I−1 ) transition strengths. At the same time, the rigid-rotor model is not able to describe the behaviour of the experimental B (E2 ,I→I−1 ) and B (M1 ,I→I−1 ) values. A new theoretical effort seems to be needed for a consistent explanation of the intraband transition strengths within two-quasiparticle bands in γ -soft nuclei.- 21.10.Tg
- 23.20.Lv
- Nuclear reaction 116 Cd( 16 O ,4 n), E=76 MeV
- Measured E γ 1 −E γ 2 , recoil-distance Doppler-shift
- 128 Ba levels deduced τ , B ( λ )
- Enriched target, Ge detectors, velocity distribution, line-shape analysis with Doppler-shift attenuation effects, differential decay-curve analysis
- Comparison of intraband E2 and M1 transition strengths within the two-quasineutron band to theoretical predictions
- Nuclear reaction[formula omitted]Cd( [formula omitted]O [formula omitted]n), [formula omitted] MeV
- Measured [formula omitted], recoil-distance Doppler-shift
- [formula omitted]Ba levels deduced [formula omitted], [formula omitted]( [formula omitted])
References(36)
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