Dipole strength distribution and specific properties of excitations in the second minimum in actinide nuclei

Soloviev, V.G.; Sushkov, A. V.; Shirikova, N. Yu.

doi:10.1007/s002180050284

Cited by 5 publications

(5 citation statements)

References 22 publications

(31 reference statements)

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“…For the K = 1, 2 phonons, the agreement with the data is better, similar to that obtained in Ref. [11] for 240 Pu, but still, the calculated energies are too high. (iii) Low-lying negative-parity oscillations show small admixtures of the multipolarities λ = 5, 7 to the octupole mode at the first minima and equal or dominant contribution of the λ = 5 multipole at the second minimum.…”

Section: Discussionsupporting

confidence: 87%

“…• The model predicts K π = 0 − energies in the second well in 240 Pu and 236 U that are three and more times larger than the claimed experimental values. For the K =1,2 phonons, the agreement with the data is better, similar to that obtained in [11] for 240 Pu, but still the calculated energies are too high.…”

Section: Discussionsupporting

confidence: 82%

“…One could also consider a fine-tuning of the pairing strength in the second well or including the quadrupole pairing as in Ref. [11]. Still, the required reduction of the 0 − phonon energies is so large that the pairing alone hardly can be a cause.…”

Section: Discussionmentioning

confidence: 99%

“…However, as long as the second minima are reflection-symmetric, this would be a second-order effect, while the energy surfaces and mass parameters do not hint to its unusual enhancement. One could also consider a finetuning of the pairing strength in the second well, or including the quadrupole pairing as in [11]. Still, the required reduction of the 0 − phonon energies is so large, that the pairing alone hardly can be a cause.…”

Section: Discussionmentioning

confidence: 99%

“…One can observe that an alternative approach to the study of octupole vibrations, the schematic Random Phase Approximation [9][10][11], while free from the adiabaticity assumption that we use for mass parameters, has its own problems, including the necessity of fixing the coupling constants. In order to study the coupling of various multipolarities, one would have many constants to fix.…”

Section: Introductionmentioning

confidence: 99%

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Low-energy shape oscillations of negative parity in the main and shape-isomeric minima in actinides

Kowal

Skalski

2010

Phys. Rev. C

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We study low-energy shape oscillations of negative parity in the first and second (isomeric) minima in actinides. As a main tool, we use the phenomenological Woods-Saxon potential with a variety of shape deformations. This allows including a mixing of various multipolarities when considering oscillations with a fixed K quantum number. The phonon energies are determined either from the collective Hamiltonian with the microscopic-macroscopic energy and cranking mass parameters, or from its simplified version with the constant-mass parameters. The results for K π = 0 − , 1 − in the first minima are in reasonable agreement with experimental data, which include predicted E1 transitions; the K π = 2 − energies are systematically overestimated. In the second minimum, as compared to the data for 240 Pu and 236 U, our calculated K = 1, 2 energies are overestimated, while the K = 0 energies are three or more times too large. This signals either a noncollective character of the experimentally assigned K = 0 states or a serious flaw of the model in the second minimum. More data on the K = 0, I π = 1 − collective states in the second minima of other nuclei are necessary to resolve this issue.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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