On the role of the coriolis and quasiparticle-phonon interactions in describingE1 transition probabilities in odd Eu and Tb isotopes

New phonon operators are introduced for describing deformed nuclei which consist of the electric and magnetic parts. The Hamiltonian of the quasiparticle-phonon nuclear model is constructed and the basic equations for the finite rank separable isoscalar and isovector multipole and spin-multipole particle-hole and particle-particle interactions between quasiparticles are derived. It is shown that calculations of one-phonon states in the RPA encounter some difficulties due to the finite rank nma x > 1 separable interaction of the electric and magnetic type. The use of complex separable n~x > 1 interactions does not lead to complication of the QPNM equations for describing fragmentation of vibrational states. The matrix elements are obtained for describing E2-and M2-transitions between excited states of deformed nuclei. It is stated that the QPNM can serve as a basis for calculating many characteristics of excited states of deformed nuclei.

Section: Resultsmentioning

confidence: 97%

“…Thus, the influence of hexadecapote interactions with 2/~=42 on the K ~= 2 + states is studied by a simultaneous inclusion of 2/~=22+42 interactions. In [9], interactions with 2 = 1 and 2 = 3 were taken into account in studying E 1 transitions from octupole to ground states.…”

Section: Introductionmentioning

confidence: 99%

Unified description of electric and magnetic excitations in deformed nuclei

Soloviev

1991

“…2.3). They lead to decreased amplitude of the main two-quasiparticle component in [~p(K')) and, as a result, to attenuation of the Coriolis matrix elements observed experimentally [13,29,33]. So in our approach the attenuation effect is obtained in a natural way.…”

Section: Iinmkp)mentioning

confidence: 88%

“…The approach represents the generalization and unification of the QPM [6] and the rotational degrees of freedom as well as the Coriolis mixing and effective n-p interaction are included [8,29,33]. As a result, the proposed approach takes into account the most important effects (the n-p interaction between external nucleons and the coupling with rotational and vibrational degrees of freedom of the doubly even core) which are necessary for the description of excitation energies as well as E2(M2) and beta transition probabilities in odd-odd deformed nuclei.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Microscopic description of vibrational degrees of freedom in odd-odd isotopes of Ho

Kvasil

Sheline

Nesterenko

et al. 1992

Self Cite

The microscopic approach for the description of low-lying intrinsic states in deformed odd-odd nuclei is formulated as a generalization of the quasiparticle-phonon model. In comparison with other models used for deformed odd-odd nuclei, the approach proposed in this paper involves vibrational degrees of freedom of the doubly-even core, their coupling to quasiparticle degrees of freedom and the n-p interaction between the odd particles. Our model treats all of these modes of nuclear motion on the same microscopic footing. This proposed model is applied to calculate the energies and phononquasiparticle structure of the intrinsic states of the oddodd Ho isotopes with A = 160, 162, 164, 166 and 168. It is found that the low-lying intrinsic states in the odd-odd Ho isotopes have only small vibrational components. In general the vibrational states are fragmented over many intrinsic states.

Microscopic structures of parity doublets in the151Pm,153Eu and155Eu nuclei

Nosek

Sheline

Sood

et al. 1992

Abstract. Microscopic structures of the proposed parity doublet bands in the odd-proton Z=61 15~Pm and Z = 63 ~53, ~55Eu nuclei are examined using the quasiparticle phonon nuclear model Hamiltonian including the residual pairing and multipole-multipole interactions. Octupole correlations between intrinsic nonrotational states are studied to check the suggested assignments of parity doublet partners in these nuclei. We conclude significant octupole correlations between a pair of K "= 1/ 2 -+ doublets in each of these nuclei, with somewhat weaker correlations between K'= 3/2 + bands in both the Eu isotopes. No octupole connection between the lowest K "= 5/2 -+ bands is found; however, significant octupole collectivity, built on the low-lying 5/2-bands, is predicted in the higher-lying 5/2 + bands which contain the 5/2 + [402] fragmented strength.