Structure of some low lying two-quasiparticle and collective states in nuclei with<i>Z</i>∼ 100 considered in the quasiparticle phonon model

Jolos, R. V.; Malov, L.A.; Shirikova, N. Yu.; Sushkov, A. V.

doi:10.1088/0954-3899/38/11/115103

Cited by 24 publications

(41 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The K π = 0 − octupole vibration predicted close to the K π = 2 − component [24] contains only the α = 1 signature sequence. The Coriolis mixing between α = 1 states in K π = 0 − and K π = 2 − bands induces an odd-even signature splitting (see, for instance, [57]).…”

Section: Discussionmentioning

confidence: 98%

“…The similar and low excitation energy (E x ∼ 1 MeV) of the K π = 2 − bandhead level suggests a collective character (namely, octupole correlations). On the theoretical side, structure models are predicting π = − levels at low excitation energy for this mass region [24,55] Fig. 12).…”

Section: Discussionmentioning

confidence: 99%

“…In contrast, the macroscopic-microscopic Woods-Saxon calculations predict K π = 8 − isomers at ∼1 MeV for both two-quasineutron and two-quasiproton configurations [2,16,20]. Recent random phase approximation (RPA) calculations predict a two-neutron quasiparticle state at 1300 keV [24]. The differences between these predictions are related to different single-particle level schemes underlying the models.…”

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Investigation of high-Kstates in252No

Sulignano¹,

Theisen²,

Delaroche³

et al. 2012

Phys. Rev. C

View full text Add to dashboard Cite

show abstract

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Investigation of high-Kstates in252No

Sulignano¹,

Theisen²,

Delaroche³

et al. 2012

Phys. Rev. C

View full text Add to dashboard Cite

show abstract

“…This is consistent with the analysis given in Refs. [20,28] and the experimental observation that in 248 Cf, the 2 − state is the lowest among these nuclei.…”

mentioning

confidence: 88%

Nonaxial-octupoleY32correlations inN=150isotones from multidimensional constrained covariant density functional theories

et al. 2012

View full text Add to dashboard Cite

The non-axial reflection-asymmetric β32 shape in some transfermium nuclei with N = 150, namely 246 Cm, 248 Cf, 250 Fm, and 252 No are investigated with multidimensional constrained covariant density functional theories. By using the density-dependent point coupling covariant density functional theory with the parameter set DD-PC1 in the particle-hole channel, it is found that, for the ground states of 248 Cf and 250 Fm, the non-axial octupole deformation parameter β32 > 0.03 and the energy gain due to the β32 distortion is larger than 300 keV. In 246 Cm and 252 No, shallow β32 minima are found. The occurrence of the non-axial octupole β32 correlations is mainly from a pair of neutron orbitals [734]9/2 (νj 15/2 ) and [622]5/2 (νg 9/2 ) which are close to the neutron Fermi surface and a pair of proton orbitals [521]3/2 (πf 7/2 ) and [633]7/2 (πi 13/2 ) which are close to the proton Fermi surface. The dependence of the non-axial octupole effects on the form of energy density functional and on the parameter set is also studied.PACS numbers: 21.10. Dr, 21.60.Jz, 27.90.+b The majority of observed nuclear shapes is of spheroidal form which is usually described by β 20 . The existence of the nonaxial-quadrupole (triaxial) deformation β 22 [1-3] and the axial octupole deformation β 30 [4] in atomic nuclei have also been confirmed both experimentally and theoretically. However, there is no a priori reason to neglect the nonaxial-octupole deformations, especially the β 32 deformation [5][6][7]. The pure β 32 deformation has a tetrahedral symmetry with a symmetry group T D d . The existence of non-trivial irreducible representations of this group makes it possible for a nuclei to have large energy gaps in their single-particle levels, thus increasing it's stability [8]. It has been anticipated that β 32 deformation occurs in the ground states of some nuclei with special combinations of the neutron and proton numbers [7][8][9]. Recently, lots of theoretical studies focus on this nuclear shape, either from the T D d -symmetric single particle spectra [7,[9][10][11] or from various nuclear models including the macroscopicmicroscopic model [9,[11][12][13], the Skyrme Hartree-Fock (SHF), SHF+BCS, or Skyrme Hartree-Fock-Bogoliubov models [11][12][13][14][15][16][17][18], and the Reflection Asymmetric Shell Model (RASM) [19,20]. In particular, Dudek et al. predicted that a negative-parity band in 156 Gd is a favorable candidate to manifest tetrahedral symmetry [13] which has stimulated several interesting experimental studies [21,22].Nowadays the study of nuclei with Z ∼ 100 becomes more and more important because it not only reveals the structure of these nuclei themselves but also provides significant information for superheavy nuclei [23][24][25][26]. One of the relevant and interesting topics is how to explain the * sgzhou@itp.ac.cn low-lying 2 − states in some N = 150 even-even nuclei. In these nuclei, the bandhead energy E(2 − ) of the lowest 2 − bands is very low [27]. It is well accepted that the octupole correlation...

show abstract

“…It is seen that the calculations with both K π = 8 − , 9 configuration suggested in Ref. [43] lies about 300-500 keV higher than the two-neutron…”

Section: Calculations and Discussionmentioning

confidence: 76%

Irregularity inKπ=8−rotational bands ofN=150isotones

Fang

Jiao

et al. 2014

Phys. Rev. C

View full text Add to dashboard Cite

Motivated by new experimental spectra in transfermium mass region, we have investigated broken-pair high-K multiparticle excited states and their rotational bands for the N = 150 isotones around Z = 100, by using the configuration-constrained pairing-deformation-frequency self-consistent total-Routhian-surface (TRS) model. In order to avoid the spurious phase transition encountered in the Bardeen-Copper-Schrieffer (BCS) pairing, the particle-number-conserving method has been employed for pairing calculations. Pairing correlations are remarkably reduced for the rotations of broken-pair multiparticle states. The present configuration-constrained TRS calculations reproduce reasonably existing experimental data. The abnormal feature in the recently observed K π = 8 − bands of 252 No and 250 Fm would be associated with configuration mixing.

show abstract

Structure of some low lying two-quasiparticle and collective states in nuclei withZ∼ 100 considered in the quasiparticle phonon model

Cited by 24 publications

References 42 publications

Investigation of high-Kstates in252No

Investigation of high-Kstates in252No

Nonaxial-octupoleY32correlations inN=150isotones from multidimensional constrained covariant density functional theories

Irregularity inKπ=8−rotational bands ofN=150isotones

Contact Info

Product

Resources

About