Orbital and spin M1 excitations in actinide nuclei

Nojarov, R.; Faessler, Amand; Sarriguren, P.; Guerra, E. Moya de; Grigorescu, M.

doi:10.1016/0375-9474(93)90119-i

Cited by 37 publications

(38 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[22]. When applied to other rare-earth [23] and actinide [21] nuclei, this parametrization has lead to a good agreement with experimental data for single M1 transitions at low energy, observed in (e, e ′ ) and (γ, γ ′ ) experiments. The energy distribution of the spin-flip M1 strength between 6 and 10 MeV, determined by inelastic proton scattering, has also been reproduced in [21,23].…”

Section: Decoupled Isovector Interactionsupporting

confidence: 62%

“…A large overlap of a given RPA state with its synthetic counterpart is an indication for an isovector rotational motion, irrespectively of the low collectivity caused by the fragmentation. The strongest (low-energy orbital) M1 excitation overlaps usually 80-90% with its synthetic counterpart [2,21]. In contrast, no one of the strongest orbital states at high energy (around 22 MeV in the upper plot of Fig. 2) overlaps more than 7% with its synthetic counterpart.…”

Section: High-energy M1 Strength and (E E ′ ) Cross Sectionsmentioning

confidence: 98%

See 1 more Smart Citation

High-energy scissors mode

1995

Self Cite

View full text Add to dashboard Cite

All the orbital M1 excitations, at both low and high energies, obtained from a rotationally invariant QRPA, represent the fragmented scissors mode. The high-energy M1 strength is almost purely orbital and resides in the region of the isovector giant quadrupole resonance. In heavy deformed nuclei the highenergy scissors mode is strongly fragmented between 17 and 25 MeV (with uncertainties arising from the poor knowledge of the isovector potential). The coherent scissors motion is hindered by the fragmentation and B(M 1) < 0.25 µ 2 N for single transitions in this region. The (e, e ′ ) cross sections for excitations above 17 MeV are one order of magnitude larger for E2 than for M1 excitations even at backward angles.

show abstract

Section: Decoupled Isovector Interactionsupporting

confidence: 62%

Section: High-energy M1 Strength and (E E ′ ) Cross Sectionsmentioning

confidence: 98%

High-energy scissors mode

1995

Self Cite

View full text Add to dashboard Cite

show abstract

“…To calculate the total partition function Z we use the macroscopic-microscopic nuclear level density of [2]. The average occupancy f is computed from BCS occupation numbers based on single particle levels from an axially symmetric deformed Saxon-Woods potential [3] with parameters from [4] which reproduce experimental data well [5,6]. All major shells up to 11hω were included which allows to extend our calculations way beyond the previously studied pf +g 9/2 shell.…”

Section: Methodsmentioning

confidence: 99%

Parity-Dependence in the Nuclear Level Density

et al. 2005

View full text Add to dashboard Cite

show abstract

“…The isospin dependence of this parametrization allows one to extend it to any mass region. Previous QRPA calculations have shown that it provides a realistic description of the ground-state properties of deformed nuclei as well as good results on M1 excitations [17] for nuclei in various mass regions. The quadrupole deformation of the WS potential is determined by fitting the microscopically calculated quadrupole moment to the corresponding experimental value.…”

Section: Brief Description Of the Theorymentioning

confidence: 97%

Deformed quasiparticle random phase approximation formalism for single- and two-neutrino doubleβdecay

et al. 2004

Self Cite

View full text Add to dashboard Cite

We use a deformed quasiparticle random phase approximation formalism to describe simultaneously the energy distributions of the single ␤ Gamow-Teller strength and the two-neutrino double ␤ decay matrix elements. Calculations are performed in a series of double ␤ decay partners with A = 48, 76, 82, 96, 100, 116, 128, 130, 136, and 150, using deformed Woods-Saxon potentials and deformed Skyrme Hartree-Fock mean fields. The formalism includes a quasiparticle deformed basis and residual spin-isospin forces in the particlehole and particle-particle channels. We discuss the sensitivity of the parent and daughter Gamow-Teller strength distributions in single ␤ decay, as well as the sensitivity of the double ␤ decay matrix elements to the deformed mean field and to the residual interactions. Nuclear deformation is found to be a mechanism of suppression of the two-neutrino double ␤ decay. The double ␤ decay matrix elements are found to have maximum values for about equal deformations of parent and daughter nuclei. They decrease rapidly when differences in deformations increase. We remark on the importance of a proper simultaneous description of both double ␤ decay and single Gamow-Teller strength distributions. Finally, we conclude that for further progress in the field, it would be useful to improve and complete the experimental information on the studied Gamow-Teller strengths and nuclear deformations.

show abstract

Orbital and spin M1 excitations in actinide nuclei

Cited by 37 publications

References 60 publications

High-energy scissors mode

High-energy scissors mode

Parity-Dependence in the Nuclear Level Density

Deformed quasiparticle random phase approximation formalism for single- and two-neutrino doubleβdecay

Contact Info

Product

Resources

About