ISSN:
1434-601X
Keywords:
PACS:21.10.Re Collective levels and giant resonances – 23.20.Ck Lifetimes and transition probabilities – 25.70.Cd Elastic and quasielastic scattering and transfer – 27.70.+q 150 ≤ A ≤ 189
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: To examine the collectivity of the previously proposed K π=4+γγ-two-phonon state in 168Er at an excitation energy of 2056 keV and of the first excited K π=0+ band at 1217 keV (b-band), a Coulomb excitation experiment has been carried out at the Heidelberg-Darmstadt Crystal Ball spectrometer. The B(E2) value connecting the 4+ γγ state to the γ-band was remeasured to be B(E)2,4+ γγ→ 2+ γ)=(600± 130) e2fm4, which almost exhausts the harmonic expectation. In addition, the B(E2) values connecting the band head of the lowest lying excited 0+ b band to the 2+ g and 2+ γ states were measured to be B(E2,2+ g→ 0+ b)=(4.4±0.6) e2fm4 and B(E2, 2+ γ→ 0+ b)=(30.4±4.6) e2fm4; the latter is almost a factor of 10 smaller than the B(E2,2+ γ→ 0+ g) value, which shows that the 0+ b band head has no significant contribution of the K π= 0+γγ-two-phonon state in its wave function.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100500050117
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